Method and system for simulating testing of a device in an acoustic and electromagnetic composite environment

Abstract

The present application relates to the technical field of equipment testing, solves the problem that it is difficult to accurately simulate an acoustic and electromagnetic combined environment and evaluate the response characteristics of equipment in the combined environment in the prior art, and provides a simulation testing method and system for equipment in an acoustic and electromagnetic combined environment, the method comprising: obtaining a target electromagnetic environment signal, a target acoustic environment signal, and corresponding target reproduction parameters, and reproducing an electromagnetic environment and an acoustic environment in a target testing area respectively; placing the equipment to be tested in the reproduced electromagnetic environment, the reproduced acoustic environment, and a combined environment formed by the two, and testing the equipment; determining combined response characteristics according to corresponding response data; adjusting electromagnetic environment parameters and acoustic environment parameters to form multiple parameter combinations, and determining the sensitivity threshold and failure boundary of the equipment to be tested according to the combined response characteristics corresponding to each parameter combination. The present application can accurately obtain the combined response characteristics, sensitivity threshold, and failure boundary of the equipment to be tested.

Description

Technical Field

[0001] This invention relates to the field of equipment testing technology, and in particular to a simulation testing method and system for equipment in a combined acoustic and electromagnetic environment. Background Technology

[0002] With the widespread application of electronic equipment in aerospace, rail transportation, automotive electronics, industrial control, and communication equipment, these devices are often simultaneously affected by electromagnetic interference and acoustic noise during actual operation. The electromagnetic environment may include electromagnetic signals of different frequencies, field strengths, and modulation methods, while the acoustic environment may include acoustic signals with different sound pressure levels, spectral characteristics, and noise types. To evaluate the reliability of equipment in complex application environments, it is typically necessary to simulate the electromagnetic and acoustic environments corresponding to the actual application scenarios in a laboratory environment and test the equipment's operating status under the simulated environment.

[0003] In existing technologies, environmental adaptability testing of equipment typically involves separate electromagnetic compatibility (EMC) and acoustic environment tests. This means applying electromagnetic interference alone in an anechoic chamber to evaluate the equipment's electromagnetic susceptibility, or applying noise alone using an acoustic testing system to evaluate performance changes in an acoustic environment. While these methods can obtain the equipment's response in a single electromagnetic or acoustic environment, in real-world applications, acoustic and electromagnetic environments often coexist. The performance degradation, bit errors, and restarts exhibited by the equipment under the combined influence of these two environments may differ from those under a single environment. Existing single-factor testing methods struggle to simultaneously reproduce both the acoustic and electromagnetic environments of the target application scenario, and also find it difficult to further determine the equipment's susceptibility and failure boundaries under combined acoustic and electromagnetic effects by comparing the equipment's responses in single and combined environments.

[0004] Chinese patent CN108132390A discloses a method and system for improving the field strength in a reverberation chamber and simulating a complex electromagnetic environment. It utilizes a reverberation chamber to simulate a multi-frequency, high-field-strength complex electromagnetic environment. It enhances the field strength of the test area by spatially synthesizing microwave power within the reverberation chamber at the same frequency, and forms a multi-frequency complex electromagnetic field through heterogeneous incoherent resonance. Furthermore, it reduces ineffective space by installing a movable, lightweight, enclosed, highly conductive metal enclosure within the reverberation chamber, thereby increasing the field strength amplitude in the test area. The system is equipped with a radio frequency signal source, power amplifier, transmitting antenna, fiber optic field strength meter, spectrum analyzer, and a measurement, control, and data acquisition computer, thus enabling the formation of a multi-frequency complex electromagnetic environment within the test area. However, this scheme mainly targets the construction of high field strength and multi-frequency composite electromagnetic environment in reverberation chambers. Its so-called composite field still refers to the electromagnetic composite field formed by multiple frequency electromagnetic signals. It does not involve the synchronous reproduction of the acoustic environment, nor does it involve obtaining and comparing the responses of the equipment in separate electromagnetic environments, separate acoustic environments, and environments with the combined action of acoustic and electromagnetic environments. Therefore, it is difficult to directly use it to evaluate the synergistic effect of the combined action of acoustic and electromagnetic environments on the equipment.

[0005] Chinese patent application CN122619016A discloses an automatic acoustic correction method and system for conference rooms. This method transmits test signals to the conference room environment, simultaneously collects the sound field response data generated by the test signals, constructs a three-dimensional acoustic model of the conference room based on the sound field response data, and uses this three-dimensional acoustic model as a simulation environment. Acoustic correction parameters are obtained through artificial intelligence algorithms, and then these parameters are loaded into an audio processing system to achieve sound field correction. The method can also use swept-frequency signals and / or pink noise as test signals, and utilizes a microphone array to collect the sound field response at multiple spatial measurement points, extracting acoustic parameters such as reverberation time, impulse response, sound pressure level distribution, and frequency response. While this solution can measure, model, and correct the sound field of a conference room, its technical purpose is to improve the acoustic condition of the conference room. The test object and processing process are concentrated on the acoustic environment itself, without addressing the reproduction of the electromagnetic environment and field strength calibration. It also does not involve applying both acoustic and electromagnetic environments to the device under test and comparing the device's response with that under two single environments. Therefore, it still cannot solve the problem of evaluating the environmental adaptability of equipment in a combined acoustic and electromagnetic environment.

[0006] Therefore, how to perform composite simulation of the acoustic and electromagnetic environments in the target application scenario in an anechoic chamber, and accurately evaluate the response characteristics of the device under test under the combined effects of the acoustic and electromagnetic environments, is a technical problem that urgently needs to be solved. Summary of the Invention

[0007] In view of this, embodiments of the present invention provide a method and system for simulating and testing devices in a combined acoustic and electromagnetic environment, in order to solve the problem in the prior art that it is difficult to accurately simulate a combined acoustic and electromagnetic environment and evaluate the response characteristics of devices in such a combined environment.

[0008] In a first aspect, embodiments of the present invention provide a method for simulating testing a device in a combined acoustic and electromagnetic environment, the method comprising: Acquire the target electromagnetic environment signal, target acoustic environment signal, preset target electromagnetic reproduction parameters, and target acoustic reproduction parameters corresponding to the target application scenario; Within the preset target test area, the target electromagnetic environment signal and the target acoustic environment signal are applied respectively to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters. Based on the parameter difference between the actual electromagnetic environment parameters and the target electromagnetic reproduction parameters, and combined with the parameter difference between the actual acoustic environment parameters and the target acoustic reproduction parameters, the outputs of the target electromagnetic environment signal and the target acoustic environment signal are adjusted respectively to obtain a reproduced electromagnetic environment and a reproduced acoustic environment that meet preset environmental reproduction conditions. The preset environmental reproduction conditions include that the parameter difference between the actual electromagnetic environment parameters and the target electromagnetic reproduction parameters is 0 and the parameter difference between the actual acoustic environment parameters and the target acoustic reproduction parameters is 0. The device under test is placed in the target test area, and the device under test is tested in the reproduced electromagnetic environment, the reproduced acoustic environment and the composite environment formed by the two, respectively, to obtain the corresponding first response data, second response data and third response data. Based on the differences between the third response data and the first and second response data, the composite response characteristics of the device under test in the composite environment are determined. The parameters of the reproduced electromagnetic environment and the reproduced acoustic environment are adjusted, and the electromagnetic environment and acoustic environment after parameter adjustment are used as the new reproduced electromagnetic environment and the new reproduced acoustic environment. The process returns to setting the device under test in the target test area, and testing the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment and the composite environment formed together, respectively, to obtain the corresponding first response data, second response data and third response data, until a preset number of composite response features are obtained. Data analysis and statistics are performed on the environmental parameters of each of the reproduced electromagnetic environments, the environmental parameters of each of the reproduced acoustic environments, and the corresponding composite response characteristics to determine the test results of the device under test.

[0009] Preferably, the acquisition of the target electromagnetic environment signal, target acoustic environment signal, preset target electromagnetic reproduction parameters, and target acoustic reproduction parameters corresponding to the target application scenario includes: In the target application scenario, the time-domain signal corresponding to the electromagnetic environment is collected to obtain the target electromagnetic environment signal; or, at least one modulation signal is selected according to a preset electromagnetic compatibility standard to establish an electromagnetic signal library, and the target electromagnetic environment signal is obtained from the electromagnetic signal library. The modulation signal includes at least one of amplitude modulation signal, frequency modulation signal and pulse modulation signal. Obtain the target field strength parameters corresponding to the target electromagnetic environment signal, and determine the target electromagnetic reproduction parameters based on the target field strength parameters; The pre-recorded acoustic waveform corresponding to the target application scenario is obtained as the target acoustic environment signal; The target acoustic reproduction parameters are determined based on the target sound pressure level corresponding to the target acoustic environment signal.

[0010] Preferably, before applying the target electromagnetic environment signal and the target acoustic environment signal respectively within the preset target test area to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters, the method further includes: A transmitting antenna is set up within the preset target test area, and the transmitting antenna is controlled to transmit continuous wave signals at multiple preset frequency points respectively; The field strength of the continuous wave corresponding to each preset frequency point is measured to obtain the field strength distribution corresponding to each preset frequency point; Based on the field strength distribution corresponding to each preset frequency point, determine the actual continuous wave field strength and field strength uniformity at each preset frequency point; Based on the difference between the actual continuous wave field strength at each preset frequency point and the corresponding preset target field strength, the output of the continuous wave signal is adjusted, and the corresponding field strength distribution is re-acquired after adjustment, until the actual continuous wave field strength at each preset frequency point reaches the corresponding preset target field strength. Based on the field strength distribution and field strength uniformity corresponding to each preset frequency point after adjustment, the continuous wave calibration result corresponding to the target test area is obtained.

[0011] Preferably, the step of applying the target electromagnetic environment signal and the target acoustic environment signal respectively within the preset target test area to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters includes: Based on the continuous wave calibration results, the target electromagnetic environment signal is applied within the target test area; Measure the peak field strength and average field strength corresponding to the target electromagnetic environment signal within the target test area, and record the field strength distribution and time waveform corresponding to the target electromagnetic environment signal; The actual electromagnetic environment parameters are determined based on the peak field strength, the average field strength, the field strength distribution, and the time waveform. A microphone is placed within the target test area, and the target acoustic environment signal is applied through a loudspeaker array. The sound pressure level and spectrum within the target test area are obtained through the microphone, and the actual acoustic environment parameters are determined based on the sound pressure level and the spectrum.

[0012] Preferably, the step of setting the device under test in the target test area and testing the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment, and the combined environment to obtain corresponding first response data, second response data, and third response data includes: Based on the preset performance indicators corresponding to the device under test, obtain the test performance items corresponding to the device under test; The test performance items are tested under the conditions of applying only the reproduced electromagnetic environment, applying only the reproduced acoustic environment, and applying both the reproduced electromagnetic environment and the reproduced acoustic environment simultaneously, respectively, to obtain the first test result, the second test result, the third test result corresponding to the test performance items, and the first abnormal state information, the second abnormal state information, and the third abnormal state information corresponding to the device under test. The first test results, the second test results, and the third test results are organized and analyzed to extract the performance change information of each test performance item under the corresponding environmental conditions. Each of the performance change information is associated with the corresponding first abnormal state information, second abnormal state information and third abnormal state information and recorded to form the first response data, the second response data and the third response data.

[0013] Preferably, determining the composite response feature based on the differences between the third response data and the first and second response data respectively includes: Extract the first performance test information, the second performance test information, and the third performance test information corresponding to the same test performance item from the first response data, the second response data, and the third response data, respectively. The third performance test information is compared with the first performance test information and the second performance test information to obtain the response difference information of the device under test in the composite environment relative to the individual electromagnetic environment and the individual acoustic environment. The response difference information is obtained to characterize the synergistic effect of the combined action of the reproduced electromagnetic environment and the reproduced acoustic environment, and the performance change corresponding to the synergistic effect is used as the composite response feature.

[0014] Preferably, the step of performing data analysis and statistics on the environmental parameters of each of the reproduced electromagnetic environments, the environmental parameters of each of the reproduced acoustic environments, and the corresponding composite response characteristics to determine the test results of the device under test includes: The environmental parameters of the reproduced electromagnetic environment, the environmental parameters of the reproduced acoustic environment, and the composite response characteristics corresponding to each composite environment test are combined according to the corresponding relationship to form multiple sets of composite environment test data. The multiple sets of composite environmental test data are classified according to at least one environmental parameter, and the composite response characteristics corresponding to different combinations of environmental parameters are compared to obtain the response change information of the composite response characteristics as the environmental parameters change. The environmental parameters include at least one of electromagnetic field strength, sound pressure level, modulation method and noise type. From the response change information, filter the environmental parameter combinations corresponding to the preset changes in the composite response features to form a sensitive environmental parameter set; The sensitive environmental parameter set is analyzed to obtain the sensitivity threshold information of the device under test under the combined action of acoustic and electromagnetic environments; the environmental parameter combination corresponding to the device under test being in a failure state is selected from each group of composite environment test data to obtain the failure environmental parameter set; Based on the set of failure environment parameters, the failure boundary information corresponding to the device under test is obtained, and the failure status of the device in each group of composite environment test data is statistically analyzed to obtain the failure probability of the composite environment. The sensitivity threshold information, the failure boundary information, and the failure probability of the composite environment are used as the test results of the device under test.

[0015] Preferably, the step of analyzing the set of sensitive environmental parameters to obtain the sensitivity threshold information of the device under test under the combined effects of acoustic and electromagnetic environments, and obtaining the failure boundary information corresponding to the device under test based on the set of failure environmental parameters, includes: Extract the environmental parameter values ​​and composite response features corresponding to each combination of environmental parameters in the set of sensitive environmental parameters, and arrange the corresponding composite response features according to the order of parameter value changes of at least one of the environmental parameters; The positions where the preset changes occur in the composite response features after positioning are determined, and the environmental parameter values ​​at the corresponding positions are recorded to obtain multiple sensitive threshold parameters; According to at least one of the electromagnetic field strength, sound pressure level, modulation method and noise type corresponding to each of the aforementioned sensitive threshold parameters, multiple sensitive threshold parameters are combined to form a sensitive threshold surface corresponding to the device under test; The electromagnetic field strength and sound pressure level corresponding to each failure state are extracted from the set of failure environment parameters, and combined with the electromagnetic field strength and sound pressure level corresponding to the non-failure state adjacent to each failure state to obtain multiple combinations of failure boundary parameters. Based on the correspondence between electromagnetic field strength and sound pressure level in each of the failure boundary parameter combinations, the failure boundary information corresponding to the device under test is formed.

[0016] Secondly, embodiments of the present invention provide a simulation testing system for a device in a combined acoustic and electromagnetic environment, used to implement the simulation testing method for a device in a combined acoustic and electromagnetic environment as described in the first aspect, the system comprising: An electromagnetic signal generation module is used to apply a target electromagnetic environment signal to the target test area of ​​the anechoic chamber, and to form a reproduced electromagnetic environment in the target test area according to the adjustment of the electromagnetic signal output parameters. The field strength calibration module is used to obtain the actual electromagnetic environment parameters corresponding to the target test area, so as to adjust the electromagnetic signal output parameters of the electromagnetic signal generation module according to the actual electromagnetic environment parameters. An acoustic generation module is used to apply a target acoustic environment signal to the target test area and to form a reproduced acoustic environment in the target test area according to the adjustment of the acoustic signal output parameters; An acoustic calibration module is used to acquire the actual acoustic environment parameters corresponding to the target test area, so as to adjust the acoustic signal output parameters of the acoustic generation module according to the actual acoustic environment parameters; The device under test monitoring module is used to acquire response data corresponding to the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment, and the composite environment formed by the reproduced electromagnetic environment and the reproduced acoustic environment, respectively.

[0017] Preferably, the electromagnetic signal generation module includes a signal generator, a first power amplifier, and a transmitting antenna connected in sequence. The signal generator is used to generate an electromagnetic environment signal, the first power amplifier is used to amplify the electromagnetic environment signal, and the transmitting antenna is used to transmit the amplified electromagnetic environment signal to the target test area. The field strength calibration module includes a field strength probe, an optical fiber transmission unit, and a spectrum analyzer. The field strength probe is used to collect the electromagnetic field strength within the target test area. The optical fiber transmission unit is used to transmit the field strength data collected by the field strength probe. The spectrum analyzer is used to determine the actual electromagnetic environment parameters based on the field strength data. The acoustic generation module includes an audio analyzer, a second power amplifier, and a speaker array. The audio analyzer is used to output an acoustic environment signal, the second power amplifier is used to amplify the acoustic environment signal, and the speaker array is used to play the amplified acoustic environment signal to the target test area. The acoustic calibration module includes a microphone, a sound level meter, and a multi-channel analyzer. The microphone is used to collect acoustic signals within the target test area, and the sound level meter and the multi-channel analyzer are used to determine the actual acoustic environment parameters based on the acoustic signals. The monitoring module for the device under test includes an optical fiber monitoring unit and a data acquisition unit. The optical fiber monitoring unit is used to monitor the working status of the device under test under different test environments, and the data acquisition unit is used to collect the corresponding response data of the device under test.

[0018] In summary, the beneficial effects of the present invention are as follows: The present invention provides a method and system for simulating and testing devices in a combined acoustic and electromagnetic environment. By acquiring target electromagnetic and acoustic environment signals corresponding to the target application scenario, as well as preset target electromagnetic and acoustic reproduction parameters, the electromagnetic and acoustic environments in the anechoic chamber have a clear scene source and reproduction benchmark. Target electromagnetic and acoustic environment signals are applied to the target test area, and actual electromagnetic and acoustic environment parameters are acquired. The output of the electromagnetic and acoustic environment signals is adjusted based on the difference between the actual environmental parameters and the corresponding target reproduction parameters, ensuring that the resulting reproduced electromagnetic and acoustic environments meet preset environmental reproduction conditions. This reduces the inconsistency between the actual test area environment and the target application scenario caused by setting the environment solely based on the output parameters of the signal generator, improving the accuracy and repeatability of the combined environment simulation. After completing the environmental reproduction, the system acquires simulation data for the device under test in a single electromagnetic environment, a single acoustic environment, and a combined acoustic and electromagnetic environment. The test collects first, second, and third response data under combined environmental conditions. It then uses the difference between the third response data and the response data from two single environmental environments to obtain composite response characteristics. This allows the test results to reflect not only the performance of the device under test when subjected to electromagnetic or acoustic interference alone, but also the response changes and synergistic effects of the combined effects of two environmental factors. This avoids the problem that single-environment testing is insufficient to reflect the response characteristics of the device under actual complex working conditions. Furthermore, by adjusting the environmental parameters of the replicated electromagnetic and acoustic environments, corresponding tests are repeatedly performed under different combinations of acoustic and electromagnetic environmental parameters to obtain a preset number of composite response characteristics. This ensures that the test data covers different response states of the device under test caused by changes in environmental conditions. Finally, by comprehensively analyzing and statistically processing each environmental parameter and its corresponding composite response characteristics, the test results of the device under test are formed. This allows for a comprehensive evaluation of the device's response changes, environmental sensitivity, and failure trends under multiple acoustic and electromagnetic combined environmental conditions, improving the completeness of the composite environment test results. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0020] Figure 1 This is a flowchart illustrating the simulation test method of the device in a combined acoustic and electromagnetic environment according to Embodiment 1 of the present invention. Figure 2This is a schematic diagram of the layout of the anechoic chamber and related functional areas used for acoustic and electromagnetic composite environment simulation testing in Embodiment 1 of the present invention. Figure 3 This is a flowchart illustrating the process of analyzing and statistically analyzing the environmental parameters of each of the reproduced electromagnetic environments, the environmental parameters of each of the reproduced acoustic environments, and the corresponding composite response characteristics in Embodiment 1 of the present invention to determine the test results of the device under test. Figure 4 This is a schematic diagram of the structure of the simulation test system of the device in the acoustic and electromagnetic combined environment in Embodiment 2 of the present invention; The labels in the diagram are as follows: 1-Shielded control room; 2-Electric shielded door; 3-Manual soundproof door; 4-Shielded power amplifier room; 51-Wall-mounted CCTV; 52-Ground-mounted CCTV; 6-Anechoic chamber; 7-Testing table. Detailed Implementation

[0021] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0023] It should be noted that all actions involving the acquisition of signals, information, or data in this invention are carried out in compliance with the relevant data protection laws and regulations of the locality and with authorization from the owner of the relevant device.

[0024] Example 1 Please see Figure 1 This invention provides a method for simulating testing a device in a combined acoustic and electromagnetic environment, the method comprising: Acquire the target electromagnetic environment signal, target acoustic environment signal, preset target electromagnetic reproduction parameters, and target acoustic reproduction parameters corresponding to the target application scenario; Specifically, the target application scenario refers to the actual usage environment in which the device under test is expected to operate or needs to be verified. This includes areas with specific electromagnetic backgrounds, such as city centers, industrial zones, and areas near airports, as well as scenarios with typical acoustic characteristics, such as aircraft cabins and vehicle driving. The acquired target electromagnetic environment signal is used to characterize the electromagnetic excitation content that needs to be reapplied in the anechoic chamber in this scenario; the target acoustic environment signal is used to characterize the acoustic excitation content that needs to be reproduced in the anechoic chamber. The preset target electromagnetic reproduction parameters are used to specify the target state that the electromagnetic environment in the target test area should achieve, including the target field strength, and can record the corresponding peak field strength, average field strength, or time waveform characteristics according to actual test needs; the target acoustic reproduction parameters are used to specify the target state of the acoustic environment, including the target sound pressure level, and characterize the reproduction results in conjunction with the acoustic spectrum. By simultaneously clarifying the environmental signals to be played and the environmental parameters to be achieved before the test begins, the environmental content in the real application scenario can be distinguished from the reproduction target in the anechoic chamber, providing a unified reference for subsequent field strength and sound pressure calibration, and avoiding the inability to determine whether the actual environment in the anechoic chamber has met the target scenario requirements simply by playing waveforms.

[0025] Within the preset target test area, the target electromagnetic environment signal and the target acoustic environment signal are applied respectively to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters. Specifically, the preset target test area includes an anechoic chamber and related functional areas used for simulating acoustic and electromagnetic combined environments. Please refer to [link to relevant documentation]. Figure 2 , Figure 2A schematic diagram of the layout of the anechoic chamber and related functional areas is shown. The shielded control room 1 houses equipment related to test process control, data acquisition, and test status monitoring, enabling control and monitoring of the environmental reproduction process and the testing process of the equipment under test. An electrically operated shielded door 2 is located between the shielded control room 1 and the external area, maintaining the electromagnetic shielding performance of the corresponding area while meeting the needs of personnel and equipment access. A manually operated soundproof door 3 is located between adjacent test areas to reduce the propagation of external acoustic interference into the test area, thereby contributing to the stability of the acoustic test environment. The shielded power amplifier room 4 houses equipment related to the power amplification of electromagnetic and / or acoustic signals, isolating the power amplifier equipment from the main test space to reduce the impact of the power amplifier equipment's operation on the test environment. A wall-mounted CCTV 51 is positioned at a preset fixed location to continuously acquire the working status of the test area and the equipment under test. A ground-mounted mobile CCTV 52 can be adjusted in monitoring position according to the location of the equipment under test and observation needs, assisting in acquiring the status changes of the equipment under test in different test environments from different angles. The anechoic chamber 6 constitutes the main space for simulating electromagnetic, acoustic, and combined acoustic and electromagnetic environments for testing the device under test. It creates a controlled electromagnetic and acoustic testing environment and is used to house testing equipment related to environmental reproduction and parameter measurement. The test bench 7, located within the anechoic chamber 6, supports the device under test. The location of the test bench 7 and its surrounding pre-defined space serve as the target testing area, allowing the application of target electromagnetic and acoustic environment signals to acquire actual electromagnetic and acoustic parameters. This enables further testing of the device's response under reproduced electromagnetic, acoustic, and combined environments. Through the coordination of these functional areas and structures, functional zoning between test control, power amplification, equipment monitoring, and environmental simulation testing spaces is achieved, providing a stable spatial foundation for subsequent electromagnetic environment calibration, acoustic environment calibration, and device response testing under combined acoustic and electromagnetic environments.

[0026] First, a target electromagnetic environment signal is applied to the area, and the peak field strength, average field strength, field strength distribution, and waveform information changing over time are obtained by measuring different locations in the target test area, thereby forming actual electromagnetic environment parameters. Before electromagnetic measurement, continuous waves can be used to scan at multiple frequency points to understand the field strength uniformity in the target test area and complete the basic field strength calibration.

[0027] On the acoustic side, a target acoustic environment signal can be applied to the target test area to measure the actual sound pressure level and spectrum within the area. If necessary, acoustic measurements can be performed at the same or similar locations as the electromagnetic field strength measurement locations to ensure that the acoustic and electromagnetic parameters correspond as closely as possible to the same disturbed space of the equipment.

[0028] Based on the parameter difference between the actual electromagnetic environment parameters and the target electromagnetic reproduction parameters, and combined with the parameter difference between the actual acoustic environment parameters and the target acoustic reproduction parameters, the outputs of the target electromagnetic environment signal and the target acoustic environment signal are adjusted respectively to obtain a reproduced electromagnetic environment and a reproduced acoustic environment that meet preset environmental reproduction conditions. The preset environmental reproduction conditions include that the parameter difference between the actual electromagnetic environment parameters and the target electromagnetic reproduction parameters is 0 and the parameter difference between the actual acoustic environment parameters and the target acoustic reproduction parameters is 0. Specifically, the parameter difference between the actual environmental parameters and the target reproduction parameters reflects the deviation between the current anechoic chamber environment and the expected reproduction environment that has not yet been eliminated. On the electromagnetic side, this can be reflected as the deviation between the actual field strength and the target field strength, while on the acoustic side, it can be reflected as the deviation between the actual sound pressure level and the target sound pressure level.

[0029] After a signal is applied, the actual electromagnetic and acoustic environmental parameters within the target test area are acquired and then compared with the corresponding target reproduction parameters. When the actual electromagnetic field strength is lower than the target value, the output level of the electromagnetic signal can be increased; when the actual electromagnetic field strength is higher than the target value, the output can be reduced accordingly. After adjustment, the electromagnetic environment within the target test area is remeasured. Similarly, on the acoustic side, the sound pressure level within the target test area can be gradually adjusted to approach the preset target value by adjusting the output level of the acoustic signal. This combination of the two types of parameter differences allows for simultaneous monitoring of the deviations on both the acoustic and electromagnetic sides within the same environmental reproduction process, enabling correction of the corresponding signal outputs, without requiring direct control of the acoustic output or vice versa using electromagnetic or acoustic deviations. Through repeated processes of measurement, comparison, adjustment, and re-measurement, the electromagnetic field strength and sound pressure level in the target test area are brought to the preset environmental reproduction conditions. The preset environmental reproduction conditions include a parameter difference of 0 between the actual electromagnetic environment parameters and the target electromagnetic reproduction parameters, and a parameter difference of 0 between the actual acoustic environment parameters and the target acoustic reproduction parameters. This forms the reproduced electromagnetic environment and reproduced acoustic environment used for subsequent equipment testing.

[0030] The device under test is placed in the target test area, and the device under test is tested in the reproduced electromagnetic environment, the reproduced acoustic environment and the composite environment formed by the two, respectively, to obtain the corresponding first response data, second response data and third response data. Specifically, when the equipment to be tested enters the formal testing phase, it should be placed in the target testing area that has already undergone environmental calibration, ensuring that the equipment maintains a basically consistent spatial position and operating state across different testing rounds. The tests can select the performance items to be observed based on the equipment's own performance indicators, and establish three test conditions in sequence: the first applies only a replicated electromagnetic environment without applying a replicated acoustic environment, used to observe performance changes and abnormal states of the equipment under the sole influence of electromagnetic interference; the second applies only a replicated acoustic environment, used to obtain the equipment's state under the sole influence of acoustic interference; the third applies both a calibrated replicated electromagnetic environment and a replicated acoustic environment simultaneously, subjecting the equipment to the combined effects of both environmental factors.

[0031] During the test, the system continuously recorded whether the equipment exhibited errors, performance degradation, or restarts, and simultaneously recorded the test results for the corresponding performance items. Data from electromagnetic conditions only were compiled into the first response data, data from acoustic conditions only were compiled into the second response data, and data from conditions involving both acoustic and electrical effects were compiled into the third response data. All three sets of response data were collected using the same test performance items and the same equipment operating conditions to ensure consistency in subsequent comparisons.

[0032] Based on the differences between the third response data and the first and second response data, the composite response characteristics of the device under test in the composite environment are determined. Specifically, composite response characteristics are used to characterize the response changes of the device under test when subjected to both acoustic and electromagnetic environments, relative to the individual effects of the two environments. The focus is not on describing the third response data itself again, but on identifying whether the combined environment produces additional response changes.

[0033] First, select identical performance items or similar abnormal states from the first, second, and third response data for comparison. For example, compare the same bit error rate, performance degradation index, or restart status. Then, compare the differences between the third and first response data, and between the third and second response data, observing whether the degree of performance degradation, the occurrence of abnormalities, or the severity of abnormalities change relative to a single environment under the combined environment. If the third response data shows new abnormal states compared to individual electromagnetic or acoustic test results, or if the existing performance degradation is further aggravated, this difference can be recorded as a synergistic response resulting from the combined effect of the acoustic and electromagnetic environments, and a corresponding composite response characteristic can be formed accordingly.

[0034] This comparison avoids drawing conclusions solely based on whether equipment fails in a combined environment. Instead, it allows for further analysis of whether the failure or performance change is related to the combined effects of acoustic and electrical environments. This corresponds to the evaluation requirements for the differences and synergistic effects among the three operating conditions.

[0035] The parameters of the reproduced electromagnetic environment and the reproduced acoustic environment are adjusted, and the electromagnetic environment and acoustic environment after parameter adjustment are used as the new reproduced electromagnetic environment and the new reproduced acoustic environment. The process returns to setting the device under test in the target test area, and testing the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment and the composite environment formed together, respectively, to obtain the corresponding first response data, second response data and third response data, until a preset number of composite response features are obtained. Specifically, after obtaining the composite response characteristics corresponding to a certain set of reproduced electromagnetic and acoustic environments, it is necessary to change the environmental conditions and repeat the test to obtain continuous information on the changes in the device response with the external environment, rather than drawing conclusions only under a single field strength and a single sound pressure condition.

[0036] Parameter adjustments are made for at least one of the following: electromagnetic field strength, sound pressure level, modulation method, and noise type. For example, the electromagnetic field strength can be changed while keeping the acoustic conditions essentially constant, or the sound pressure level can be gradually changed while keeping the electromagnetic environment conditions essentially constant. The modulation method of the electromagnetic signal can also be changed, or the noise can be switched between narrowband and broadband noise. After each parameter adjustment, the adjusted electromagnetic and acoustic environments should be used as the new test environment. Once the corresponding environmental conditions meet the test requirements, the tests for electromagnetic-only, acoustic-only, and combined acoustic-electric conditions should be repeated, and the first, second, and third response data should be obtained again. Then, new composite response characteristics are obtained in the same way. As multiple rounds of testing continue, multiple combinations of environmental parameters and their corresponding preset number of composite response characteristics are formed. The preset number is determined based on actual experiments, for example, 20. This allows the process of the equipment changing from no significant impact, to a sensitive response, to significant performance degradation or even failure to be gradually recorded, providing a continuous data foundation for subsequent identification of sensitivity thresholds and failure boundaries.

[0037] Data analysis and statistics are performed on the environmental parameters of each of the reproduced electromagnetic environments, the environmental parameters of each of the reproduced acoustic environments, and the corresponding composite response characteristics to determine the test results of the device under test.

[0038] Specifically, after multiple rounds of testing, the reproduced electromagnetic environment parameters, reproduced acoustic environment parameters, and composite response characteristics obtained from each test are organized into multiple sets of composite environment test data according to their correspondence, thereby establishing a one-to-one correspondence between environmental conditions and equipment response. These data are classified and compared according to electromagnetic field strength, sound pressure level, modulation method, or noise type. It is observed whether the composite response characteristics change from stable to sensitive, or from sensitive to significantly abnormal, as a certain environmental parameter gradually changes. The environmental parameter combinations corresponding to these state transitions are recorded. Multiple such parameter combinations can further reflect the change in the sensitivity threshold of the equipment under the combined action of acoustics and electricity. For test data showing equipment failure, it can also be compared with adjacent non-failure test conditions to extract the electromagnetic field strength and sound pressure level corresponding to the transition from normal or non-failure state to failure state, thus forming a failure boundary with electromagnetic field strength and sound pressure level as the main coordinate relationship. Simultaneously, by summarizing the number of times or states of equipment failure under different combinations of environmental parameters, the failure probability under composite environments can be obtained. The final sensitivity threshold information, failure boundary, and failure probability together constitute the test results of the device under test. This allows the test conclusions to not only answer whether the device is normal under a certain environmental condition, but also to further reflect the device's sensitivity to acoustic and electromagnetic composite environments, the boundary location of failure occurrence, and the failure risk under different composite conditions.

[0039] Preferably, the acquisition of the target electromagnetic environment signal, target acoustic environment signal, preset target electromagnetic reproduction parameters, and target acoustic reproduction parameters corresponding to the target application scenario includes: In the target application scenario, the time-domain signal corresponding to the electromagnetic environment is collected to obtain the target electromagnetic environment signal; or, at least one modulation signal is selected according to a preset electromagnetic compatibility standard to establish an electromagnetic signal library, and the target electromagnetic environment signal is obtained from the electromagnetic signal library. The modulation signal includes at least one of amplitude modulation signal, frequency modulation signal and pulse modulation signal. Obtain the target field strength parameters corresponding to the target electromagnetic environment signal, and determine the target electromagnetic reproduction parameters based on the target field strength parameters; The pre-recorded acoustic waveform corresponding to the target application scenario is obtained as the target acoustic environment signal; The target acoustic reproduction parameters are determined based on the target sound pressure level corresponding to the target acoustic environment signal.

[0040] Specifically, the target electromagnetic environment signal can originate from actual field acquisition in the target application scenario or from a standard signal library corresponding to a preset electromagnetic compatibility standard. When using the field acquisition method, environmental electromagnetic signals can be continuously recorded using broadband reception in typical application scenarios such as city centers, industrial areas, and near airports. A corresponding time-domain waveform file is generated according to the acquisition time, and this time-domain waveform serves as the target electromagnetic environment signal for subsequent anechoic chamber reproduction, thus preserving the characteristics of electromagnetic signals changing over time in the actual scenario. When using the standard signal method, at least one of amplitude modulation (AM), frequency modulation (FM), and pulse modulation (PWM) signals can be selected according to the preset electromagnetic compatibility standard to establish an electromagnetic signal library. Then, a signal that meets the current test requirements is selected from the electromagnetic signal library as the target electromagnetic environment signal. Among them, AM signals mainly reflect the characteristics of carrier amplitude changing with modulation information, FM signals mainly reflect the characteristics of carrier frequency changing with modulation information, and PWM signals have obvious time-domain abrupt change characteristics. By simultaneously retaining both field acquisition and standard signal library acquisition methods, the needs of real-world scenario reproduction and standardized electromagnetic compatibility testing can be met.

[0041] The target field strength parameter and the signal waveform or modulation form represented by the target electromagnetic environment signal belong to different levels of test information. The target electromagnetic environment signal addresses what kind of electromagnetic signal needs to be played in the anechoic chamber, while the target field strength parameter addresses what intensity level the electromagnetic signal needs to reach in the target test area. The target field strength value corresponding to the selected target electromagnetic environment signal is obtained and used as an important component of the target electromagnetic reproduction parameter. This is used to compare and adjust the actual field strength in the anechoic chamber. In the existing test scheme, the power amplifier output is adjusted to make the EUT area reach the preset field strength, and the peak field strength, average field strength, field strength distribution and time waveform are further measured during actual scene signal calibration. Therefore, the target field strength parameter can provide a clear benchmark for subsequent judgment of whether the electromagnetic environment has been reproduced well.

[0042] The target acoustic environment signal is used to characterize the noise of the target scene that needs to be replayed in a dark room. For acoustic environments with obvious scene characteristics, such as aircraft cabin noise and vehicle driving noise, the actual noise in the corresponding scene can be recorded in advance to form a pre-recorded acoustic waveform. In subsequent tests, reading and playing the pre-recorded acoustic waveform can form the target acoustic environment signal, thus preserving the characteristics of the noise of a specific scene changing over time and the coexistence of different frequency components. In the process of acoustic calibration, white noise or pink noise can also be used as the basic acoustic signal to measure and adjust the sound pressure level and spectrum of the target test area. The target sound pressure level (SPL) is used to specify the sound intensity level that the target acoustic environment should achieve in the area where the device under test is located. The target SPL corresponding to the target acoustic environment signal can be set as the target acoustic reproduction parameter, so that subsequent acoustic environment reproduction no longer only relies on completing the acoustic waveform playback as a judgment condition, but also needs to further confirm whether the actual SPL in the target test area meets the preset requirements. In actual testing, the SPL and spectrum of the target test area can be measured, and the acoustic output can be adjusted to make the SPL reach the corresponding target value. This ensures that the acoustic intensity applied to the location of the device under test in different test rounds has good stability and comparability, providing a unified environmental benchmark for subsequent individual electromagnetic tests, individual acoustic tests, and acoustic-electric composite environment tests.

[0043] Preferably, before applying the target electromagnetic environment signal and the target acoustic environment signal respectively within the preset target test area to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters, the method further includes: A transmitting antenna is set up within the preset target test area, and the transmitting antenna is controlled to transmit continuous wave signals at multiple preset frequency points respectively; The field strength of the continuous wave corresponding to each preset frequency point is measured to obtain the field strength distribution corresponding to each preset frequency point; Based on the field strength distribution corresponding to each preset frequency point, determine the actual continuous wave field strength and field strength uniformity at each preset frequency point; Based on the difference between the actual continuous wave field strength at each preset frequency point and the corresponding preset target field strength, the output of the continuous wave signal is adjusted, and the corresponding field strength distribution is re-acquired after adjustment, until the actual continuous wave field strength at each preset frequency point reaches the corresponding preset target field strength. Based on the field strength distribution and field strength uniformity corresponding to each preset frequency point after adjustment, the continuous wave calibration result corresponding to the target test area is obtained.

[0044] Specifically, continuous wave calibration is used to confirm that the target test area can form a stable and expected basic electromagnetic field distribution under different frequency conditions before the target electromagnetic environment signal is formally loaded, thereby avoiding the influence of uneven field strength or output amplitude deviation in the anechoic chamber space on the subsequent actual scene signal reproduction.

[0045] During implementation, a transmitting antenna is deployed at the test location corresponding to the preset target test area, and continuous wave signals are output sequentially according to multiple pre-set frequency points. The continuous wave signal refers to a single-frequency electromagnetic signal that maintains continuous transmission for a certain period of time. Calibration using multiple preset frequency points can cover the spatial propagation states corresponding to different frequencies within the test frequency range. For each preset frequency point, multiple spatial measurement locations within the target test area can be selected to scan and record the continuous wave field strength. The field strength values ​​obtained from each measurement location form the field strength distribution corresponding to that frequency point. The field strength distribution reflects the strength variation of the electromagnetic field at the same frequency point at different spatial locations within the target test area. Based on this, the actual continuous wave field strength at that frequency point can be obtained, and the field strength uniformity is evaluated by comparing the field strength differences between different measurement locations. Field strength uniformity is used to characterize whether the electromagnetic field effect experienced by different locations within the target test area remains within a relatively consistent range.

[0046] After obtaining the actual continuous wave field strength, it is compared with the preset target field strength corresponding to the current preset frequency. When the actual field strength is lower than the preset target field strength, the output level of the continuous wave signal can be increased. When the actual field strength is higher than the preset target field strength, the output is reduced accordingly. After each output adjustment, the target test area is rescanned to obtain the field strength distribution and actual continuous wave field strength at that frequency. This forms a closed-loop calibration process of measurement, comparison, adjustment, and re-measurement until the actual continuous wave field strength at each preset frequency meets the corresponding target field strength requirement.

[0047] After the adjustment is completed, the final field strength distribution, actual field strength and field strength uniformity obtained at each frequency point are summarized to form the continuous wave calibration result corresponding to the target test area. This calibration result can reflect the basic electromagnetic field state of the target test area at different frequencies, providing a known field strength reference for subsequent playback of field acquisition signals or standard library signals, so that the peak field strength, average field strength, spatial distribution and temporal waveform of the actual scene signal can be measured and reproduced under relatively stable basic electromagnetic conditions.

[0048] Preferably, the step of applying the target electromagnetic environment signal and the target acoustic environment signal respectively within the preset target test area to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters includes: Based on the continuous wave calibration results, the target electromagnetic environment signal is applied within the target test area; Measure the peak field strength and average field strength corresponding to the target electromagnetic environment signal within the target test area, and record the field strength distribution and time waveform corresponding to the target electromagnetic environment signal; The actual electromagnetic environment parameters are determined based on the peak field strength, the average field strength, the field strength distribution, and the time waveform. A microphone is placed within the target test area, and the target acoustic environment signal is applied through a loudspeaker array. The sound pressure level and spectrum within the target test area are obtained through the microphone, and the actual acoustic environment parameters are determined based on the sound pressure level and the spectrum.

[0049] Specifically, the continuous wave calibration result can be understood as the reference state of the target test area after basic field strength calibration at different frequencies. Its function is to provide a stable and repeatable electromagnetic test basis for loading electromagnetic signals in actual scenarios. Therefore, when formally reproducing the target electromagnetic environment, the time-domain waveform acquired from the external field or the modulation signal selected from the standard signal library can be applied to the target test area based on this calibration, rather than directly using the output state of the signal source as the basis for judging whether the environment has been reproduced correctly. After the target electromagnetic environment signal is loaded, the electromagnetic field formed in the actual area where the equipment under test is located needs to be measured. Among them, the peak field strength is used to reflect the maximum electromagnetic effect intensity that occurs during the test, and the average field strength is used to reflect the overall electromagnetic effect level within a certain test time. Both can describe the actual scene signal with time-varying characteristics from different perspectives. Simultaneously, recording the field strength at different spatial locations within the target test area yields the field strength distribution, reflecting the spatial variations of the electromagnetic environment within the equipment's test space. The time waveform records the actual electromagnetic field's change over time, used to determine whether the electromagnetic environment formed in the anechoic chamber retains the dynamic characteristics of the target scene signal. By summarizing the peak field strength, average field strength, field strength distribution, and time waveform, actual electromagnetic environment parameters are formed. These parameters simultaneously include information on electromagnetic intensity, spatial distribution, and temporal variation, providing a more complete basis for subsequent comparisons with the target electromagnetic reproduction parameters than a single field strength value.

[0050] Acoustic environment acquisition can be achieved by deploying microphones in the target test area and playing the target acoustic environment signal through a loudspeaker array. For specific scenarios such as aircraft cabin noise and vehicle driving noise, pre-recorded acoustic waveforms can be played back. White noise or pink noise can also be used for testing during acoustic calibration. After the microphones receive the actual acoustic signal formed in the target test area, the sound pressure level and spectrum can be further obtained. The sound pressure level reflects the actual sound intensity received at the location of the device under test, and the spectrum is used to characterize the distribution of sound energy in different frequency ranges. Using both as actual acoustic environment parameters can avoid evaluating the acoustic environment solely based on the loudspeaker output. Instead, the actual sound field state formed in the test area where the device is located can be used as the basis for subsequent reproduction and adjustment.

[0051] In this way, the electromagnetic side forms a real environmental description consisting of peak field strength, average field strength, field strength distribution, and time waveform, while the acoustic side forms a real environmental description consisting of sound pressure level and spectrum. This ensures that both types of environmental parameters originate from actual measurement results within the target test area, thus providing a unified and verifiable environmental basis for subsequent comparison of target electromagnetic reproduction parameters and target acoustic reproduction parameters, adjustment of the two types of environmental outputs, and conduct of acoustic-electric composite testing.

[0052] Preferably, the step of setting the device under test in the target test area and testing the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment, and the combined environment to obtain corresponding first response data, second response data, and third response data includes: Under the condition of applying only the reproduced electromagnetic environment, obtain the individual electromagnetic environment parameters corresponding to the target test area, and test the device under test to obtain the first response data; Under the condition of applying only the reproduced acoustic environment, obtain the individual acoustic environment parameters corresponding to the target test area, and test the device under test to obtain the second response data; Simultaneously apply the reproduced electromagnetic environment and the reproduced acoustic environment to obtain the joint electromagnetic environment parameters and joint acoustic environment parameters corresponding to the target test area; Based on the difference between the combined electromagnetic environment parameters and the individual electromagnetic environment parameters, a first cross-disturbance parameter is determined for the applied replica acoustic environment on the replica electromagnetic environment; and based on the difference between the combined acoustic environment parameters and the individual acoustic environment parameters, a second cross-disturbance parameter is determined for the applied replica acoustic environment on the replica acoustic environment. The effectiveness of the composite environment is confirmed based on the first cross-disturbance parameter and the second cross-disturbance parameter. When the first cross-perturbation parameter and the second cross-perturbation parameter respectively satisfy the corresponding preset cross-perturbation conditions, and the joint electromagnetic environment parameter and the joint acoustic environment parameter respectively satisfy the corresponding preset environment reproduction conditions, the current composite environment is determined as an effective composite environment, and the device under test is tested under the effective composite environment to obtain the third response data.

[0053] Specifically, after separately calibrating the electromagnetic environment and the acoustic environment, it is further confirmed whether the original reproduction state can still be maintained when both types of environments are applied simultaneously. This is to avoid the acoustic generation system and the electromagnetic signal generation system generating additional disturbances to each other during joint operation, which would affect the test results of the device under test. The individual electromagnetic environment parameters refer to the electromagnetic environment state actually measured in the target test area when only the electromagnetic environment application link is activated. These parameters may include at least one of field strength, peak field strength, average field strength, field strength distribution, or time waveform, and are used as a reference state for reproducing the electromagnetic environment when it is not affected by the acoustic generation system. The individual acoustic environment parameters are the acoustic environment state obtained when only the acoustic environment application link is activated. These parameters may include at least one of sound pressure level and spectrum, and are used to characterize the reference state for reproducing the acoustic environment when it is not affected by the electromagnetic signal generation system.

[0054] After obtaining two types of reference states, a reproducible electromagnetic environment and a reproducible acoustic environment are simultaneously applied, causing the two environmental generation systems to operate together according to their actual working states during subsequent composite testing. The electromagnetic and acoustic environments within the target test area are then remeasured, yielding joint electromagnetic environment parameters and joint acoustic environment parameters. At this point, the joint electromagnetic environment parameters reflect the actual electromagnetic environment formed in the target test area when the acoustic generation system is already operational, while the joint acoustic environment parameters reflect the actual acoustic environment formed in the target test area when the electromagnetic signal generation systems are simultaneously operational. Comparing the joint electromagnetic environment parameters with the individual electromagnetic environment parameters allows us to determine whether the operation of the acoustic generation system has altered the original reproducible electromagnetic environment, such as field strength amplitude, spectral composition, field strength distribution, or time waveform. The degree of this alteration can be used as the first cross-perturbation parameter. Similarly, comparing the joint acoustic environment parameters with the individual acoustic environment parameters allows us to determine whether the operation of the electromagnetic signal generation system has altered the target sound pressure level, spectrum, or other acoustic characteristics. The degree of this alteration can be used as the second cross-perturbation parameter. Therefore, the first cross-perturbation parameter reflects the degree of influence of the acoustic test link on the electromagnetic environment, and the second cross-perturbation parameter reflects the degree of influence of the electromagnetic test link on the acoustic environment. Neither of them is the response of the device under test itself, but rather environmental effectiveness parameters used to evaluate whether the test environment itself has unacceptable changes due to the simultaneous operation of the two environmental systems.

[0055] Subsequently, the first and second cross-perturbation parameters are compared with their corresponding preset cross-perturbation conditions. Simultaneously, it is necessary to determine whether the combined electromagnetic environment parameters still meet the target electromagnetic reproduction requirements and whether the combined acoustic environment parameters still meet the target acoustic reproduction requirements. In other words, even if a cross-perturbation is small, if the actual field strength or sound pressure level after simultaneous operation deviates from the target reproduction state, the current environment should not be directly used as the formal composite test environment. Only when both types of cross-perturbations are within permissible ranges, and the electromagnetic and acoustic environments under simultaneous application still meet their respective reproduction requirements, is the current environment determined as the effective composite environment, and the third response data of the device under test is obtained under this effective composite environment. This processing allows for a further distinction between environmental changes caused by the interaction of the test system itself and the actual response of the device under test under the combined action of acoustics and electricity, building upon the existing three test conditions: electromagnetic only, acoustic only, and simultaneous acoustic and electrical effects. This makes the differences between the subsequent third response data and the first and second response data more reflective of the device under test's own acoustic and electrical composite response, while reducing the possibility that additional environmental disturbances caused by the joint operation of test equipment such as loudspeaker arrays, power amplifiers, and electromagnetic transmission links are mistaken for equipment synergy effects. This improves the reliability of composite response characteristics and subsequent test results such as sensitivity thresholds and failure boundaries.

[0056] Preferably, before confirming the effectiveness of the composite environment based on the first cross-perturbation parameter and the second cross-perturbation parameter, the method further includes: Under conditions where neither the reproduced electromagnetic environment nor the reproduced acoustic environment is applied, the background electromagnetic environment parameters and background acoustic environment parameters corresponding to the target test area are obtained; Under the condition of applying only the reproduced acoustic environment, the electromagnetic environment parameters of the acoustic working state corresponding to the target test area are obtained, and the additional electromagnetic disturbance parameters corresponding to the acoustic generation system are determined according to the difference between the electromagnetic environment parameters of the acoustic working state and the background electromagnetic environment parameters. Under the condition of applying only the reproduced electromagnetic environment, the acoustic environment parameters of the electromagnetic working state corresponding to the target test area are obtained, and the additional acoustic disturbance parameters corresponding to the electromagnetic signal generation system are determined according to the difference between the acoustic environment parameters of the electromagnetic working state and the background acoustic environment parameters. Based on the correspondence between the additional electromagnetic disturbance parameters and the first cross disturbance parameters, and the correspondence between the additional acoustic disturbance parameters and the second cross disturbance parameters, the cross disturbance source information corresponding to the composite environment is determined; The effectiveness of the complex environment is confirmed based on the cross-disturbance source information, the first cross-disturbance parameter, and the second cross-disturbance parameter.

[0057] Specifically, based on the ability to determine whether the acoustic and electromagnetic environments change when applied simultaneously using the first and second cross-disturbance parameters, it is further possible to distinguish whether the changes originate from additional disturbances within the test system itself or from composite state changes that only occur when the two environments are running together. This avoids directly judging the composite environment as invalid based solely on the difference between the combined state and the individual state.

[0058] First, the background electromagnetic environment parameters and background acoustic environment parameters of the target test area are obtained when neither the electromagnetic environment nor the acoustic environment is applied. The background electromagnetic environment parameters are used to characterize the original electromagnetic background in the anechoic chamber when the electromagnetic environment generation links such as the transmitting antenna and the first power amplifier are not working, and the acoustic generation links are also not working. The background acoustic environment parameters are used to characterize the original acoustic background in the target test area when the acoustic generation links such as the loudspeaker array and the second power amplifier are not working. The background parameters can serve as a unified reference for subsequent judgment on whether the test system itself introduces additional environmental components.

[0059] The original test system itself has independent electromagnetic signal generation, field strength calibration, acoustic generation and acoustic calibration links, so the above electromagnetic and acoustic environmental parameters can be obtained separately. Subsequently, only the acoustic generation system is activated to create a reproduced acoustic environment. Simultaneously, electromagnetic environment parameters of the acoustic operating state within the target test area are acquired via electromagnetic measurement links such as field strength probes. These parameters are compared with the background electromagnetic environment parameters. If new field strength, spectral components, field strength fluctuations, or other electromagnetic characteristic changes occur, it indicates that the audio analyzer, second power amplifier, speaker array, and their connecting links may have introduced additional electromagnetic disturbances into the anechoic chamber during operation. The corresponding changes form additional electromagnetic disturbance parameters, used to characterize the degree of pollution of the electromagnetic test environment by the acoustic generation system itself. Similarly, when only the electromagnetic signal generation system is activated to create a reproduced electromagnetic environment, the acoustic state of the target test area continues to be detected via microphones, sound level meters, or multi-channel analyzers. The obtained acoustic environment parameters of the electromagnetic operating state are compared with the background acoustic environment parameters. If additional changes occur in sound pressure level, spectrum, or other acoustic characteristics, the corresponding differences can be identified as additional acoustic disturbance parameters, used to reflect non-target acoustic components introduced by the electromagnetic signal generation system during operation through equipment mechanical vibration, power equipment operating noise, or other test links. The additional electromagnetic disturbance parameters and additional acoustic disturbance parameters here have different meanings from the aforementioned first cross disturbance parameters and second cross disturbance parameters. The former focuses on the additional effects introduced by a single test system relative to the background environment of the anechoic chamber, while the latter focuses on the environmental changes produced by the two systems running simultaneously relative to their respective individual reproduction states. Therefore, by comparing the correspondence between the additional electromagnetic disturbance parameters and the first cross disturbance parameters in terms of disturbance direction, amplitude of change, frequency range, or time change characteristics, and by comparing the correspondence between the additional acoustic disturbance parameters and the second cross disturbance parameters, it can be determined whether the cross disturbances appearing in the joint state can be mainly explained by the electromagnetic radiation of the acoustic generation system itself, the acoustic disturbances introduced by the electromagnetic signal generation system itself, or whether there are other cross effects that only appear significantly when the two systems are running together, thus forming cross disturbance source information.

[0060] Finally, the cross disturbance source information, together with the first cross disturbance parameter and the second cross disturbance parameter, is used to confirm the validity of the composite environment. For example, if the detected first cross disturbance mainly originates from the additional electromagnetic disturbance of the acoustic generation system itself and its degree exceeds the allowable range, it can be considered that the current composite environment is contaminated by the test system itself and is not suitable for directly obtaining the third response data of the device under test. Conversely, if the additional disturbance generated by the test system itself is within the allowable range, and the first cross disturbance parameter and the second cross disturbance parameter formed after the two systems are running simultaneously still meet the corresponding requirements, it indicates that the current acoustic-electric composite environment has good controllability and interpretability and can continue to be used as the formal composite test environment for the device under test.

[0061] Preferably, the step of setting the device under test in the target test area and testing the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment, and the combined environment to obtain corresponding first response data, second response data, and third response data includes: Based on the preset performance indicators corresponding to the device under test, obtain the test performance items corresponding to the device under test; The test performance items are tested under the conditions of applying only the reproduced electromagnetic environment, applying only the reproduced acoustic environment, and applying both the reproduced electromagnetic environment and the reproduced acoustic environment simultaneously, respectively, to obtain the first test result, the second test result, the third test result corresponding to the test performance items, and the first abnormal state information, the second abnormal state information, and the third abnormal state information corresponding to the device under test. The first test results, the second test results, and the third test results are organized and analyzed to extract the performance change information of each test performance item under the corresponding environmental conditions. Each of the performance change information is associated with the corresponding first abnormal state information, second abnormal state information and third abnormal state information and recorded to form the first response data, the second response data and the third response data.

[0062] Specifically, the preset performance indicators are the performance requirements of the device under test under normal operating conditions to evaluate its functional status and operational quality. The test performance items may differ for different types of equipment. Therefore, before conducting composite environment testing, test items that need to be continuously observed are selected based on the performance requirements of the equipment itself, so that the data collected under the three environmental conditions are for the same performance object and are comparable. During the test, the working mode and test performance items of the device under test are kept consistent, and only the external environmental conditions are changed. Three test states are established, namely, only the electromagnetic environment exists, only the acoustic environment exists, and both the electromagnetic and acoustic environments exist simultaneously. The actual performance of the same test performance items is recorded during the duration of each test state, thereby forming the first test result, the second test result, and the third test result, respectively. At the same time, it is recorded whether the equipment has abnormal working states such as bit errors, performance degradation, and restarts during the corresponding test process, forming abnormal state information corresponding to the three test states. Among them, the bit error state can reflect the error in data transmission or processing after the equipment is subjected to external interference. The performance degradation state is used to reflect the degradation of the original performance of the equipment under the influence of the environment. The restart state reflects that the environmental interference has caused the equipment to have obvious operational abnormalities. To enable subsequent comparisons of the three sets of original test results, the first, second, and third test results can be organized according to the same test performance items. The test results for the same performance item under different environmental conditions are correlated, and the changes are observed under separate electromagnetic, separate acoustic, and combined acoustic and electromagnetic effects, thus forming corresponding performance change information. Furthermore, the performance change information under each environmental condition is correlated with the abnormal state information recorded synchronously under that environmental condition and saved. This allows the first response data to simultaneously reflect performance and abnormal states under electromagnetic conditions only, the second response data to reflect the corresponding situation under acoustic conditions only, and the third response data to reflect the equipment response under the combined effects of acoustic and electromagnetic environments. These three sets of response data are not isolated test values, but rather structured test results with the same test items, different environmental conditions, and corresponding abnormal states. Subsequently, the differences between the third response data and the first and second response data can be compared on the same evaluation basis, thereby analyzing whether the combined application of acoustic and electromagnetic interference produces a synergistic effect distinct from that of a single interference condition.

[0063] Preferably, determining the composite response feature based on the differences between the third response data and the first and second response data respectively includes: Extract the first performance test information, the second performance test information, and the third performance test information corresponding to the same test performance item from the first response data, the second response data, and the third response data, respectively. The third performance test information is compared with the first performance test information and the second performance test information to obtain the response difference information of the device under test in the composite environment relative to the individual electromagnetic environment and the individual acoustic environment. The response difference information is obtained to characterize the synergistic effect of the combined action of the reproduced electromagnetic environment and the reproduced acoustic environment, and the performance change corresponding to the synergistic effect is used as the composite response feature.

[0064] Specifically, the first, second, and third performance test information are data extracted from response data generated under three different environmental conditions for the same performance test item, which can be directly compared. The purpose is to avoid mixing different performance items or different anomaly types for comparison, which would affect the analysis results. In actual processing, the first, second, and third response data can be organized according to the performance test item to form a one-to-one correspondence between the test results under electromagnetic environment only, acoustic environment only, and combined acoustic and electro-optical environment on the same performance item. Then, the numerical changes, state changes, or abnormal performance of the same performance item can be compared. Among them, the third performance test information reflects the equipment status under the combined environmental conditions, while the first and second performance test information serve as references under separate electromagnetic and acoustic conditions, respectively. By comparing the third performance test information with the first and second performance test information, we can obtain the response difference information of the combined environment relative to the two individual environments. This response difference information can indicate whether the performance degradation has further increased, and whether errors, restarts, or other abnormal states not present in the individual environments have occurred in the combined environment. This allows us to distinguish whether the device response mainly originates from a single interference or whether additional changes occur when the acoustic and electromagnetic environments act simultaneously. The so-called synergistic effect refers to the additional changes or enhancement trends exhibited by the device response in the combined environment relative to the individual electromagnetic and acoustic environments. Therefore, the above response difference information can be used to characterize this combined effect, and the corresponding performance changes can be organized into composite response characteristics. These composite response characteristics not only indicate what changes occurred in the device under the combined environment but also reflect the degree of difference between these changes and the two individual environmental conditions. This provides a unified data basis for comparing the device sensitivity under different parameter combinations after changing electromagnetic field strength, sound pressure level, modulation method, and noise type.

[0065] Preferably, please refer to Figure 3 The step of performing data analysis and statistics on the environmental parameters of each of the reproduced electromagnetic environments, the environmental parameters of each of the reproduced acoustic environments, and the corresponding composite response characteristics to determine the test results of the device under test includes: The environmental parameters of the reproduced electromagnetic environment, the environmental parameters of the reproduced acoustic environment, and the composite response characteristics corresponding to each composite environment test are combined according to the corresponding relationship to form multiple sets of composite environment test data. The multiple sets of composite environmental test data are classified according to at least one environmental parameter, and the composite response characteristics corresponding to different combinations of environmental parameters are compared to obtain the response change information of the composite response characteristics as the environmental parameters change. The environmental parameters include at least one of electromagnetic field strength, sound pressure level, modulation method and noise type. From the response change information, filter the environmental parameter combinations corresponding to the preset changes in the composite response features to form a sensitive environmental parameter set; The sensitive environmental parameter set is analyzed to obtain the sensitivity threshold information of the device under test under the combined action of acoustic and electromagnetic environments; the environmental parameter combination corresponding to the device under test being in a failure state is selected from each group of composite environment test data to obtain the failure environmental parameter set; Based on the set of failure environment parameters, the failure boundary information corresponding to the device under test is obtained, and the failure status of the device in each group of composite environment test data is statistically analyzed to obtain the failure probability of the composite environment. The sensitivity threshold information, the failure boundary information, and the failure probability of the composite environment are used as the test results of the device under test.

[0066] Specifically, composite environment test data is used to establish a clear correspondence between the electromagnetic environment conditions, acoustic environment conditions and the composite response of the device under test under these conditions for each test, so that subsequent analysis can trace back to which set of environmental parameters a certain performance change occurred under. In actual data processing, the parameters such as electromagnetic field strength, sound pressure level, modulation method, and noise type corresponding to each test are recorded together with the composite response characteristics obtained from that test as a set of test data. Then, one or more environmental parameters are selected as comparison dimensions. For example, while keeping the modulation method and noise type unchanged, the electromagnetic field strength or sound pressure level is gradually changed, or the composite response corresponding to different modulation methods and different noise types is compared under similar field strength and sound pressure conditions. In this way, the trend of performance changes, abnormal states, or cooperative responses of the device under test with changes in environmental conditions can be observed.

[0067] The response change information reflects the changes in the composite response characteristics relative to the previous or adjacent parameter combinations after changes in environmental parameters. When the device gradually shows significant performance degradation, increased error rate, restarts, etc., after the response has become basically stable, the electromagnetic field strength, sound pressure level, and other environmental parameters corresponding to the start of the change or the achievement of preset judgment conditions can be recorded, and these parameter combinations can be classified into the sensitive environmental parameter set. The sensitive environmental parameter set here does not require the device to be completely failed, but is used to collect test conditions in which the device begins to show significant sensitivity to the combined acoustic and electromagnetic effects.

[0068] By further organizing these sensitive parameter combinations according to the changing relationships of parameters such as electromagnetic field strength and sound pressure level, we can obtain the sensitivity threshold information corresponding to the equipment under different composite environmental conditions, and further form a sensitivity threshold surface reflecting the change of the equipment's sensitivity with the acoustic and electrical environment. Since the test data clearly states that joint tests are repeatedly conducted by changing electromagnetic field strength, sound pressure level, modulation method, and noise types such as narrowband or broadband, the sensitivity threshold does not come from a single test, but from the continuous comparison between multiple sets of variable parameter test results. For test data that have already shown a failure state, we can separately select the corresponding environmental parameter combinations to form a failure environment parameter set, and compare these failure parameters with adjacent non-failure parameters to identify the approximate boundary position where the equipment transitions from a normal working state to a failure state. In particular, when electromagnetic field strength and sound pressure level are used as the main changing parameters, we can organize the electromagnetic field strength and sound pressure level corresponding to each failure critical position to form failure boundary information reflecting the boundary relationship between the failure area and the non-failure area of ​​the equipment under the combined acoustic and electrical effects. This processing is consistent with the test method of drawing a failure boundary diagram with electromagnetic field strength as the horizontal axis and sound pressure level as the vertical axis. Simultaneously, the test results of failure states in all composite environment test data can be statistically analyzed, and the composite environment failure probability can be formed by combining the number of tests or failure occurrence under different combinations of environmental parameters. This reflects the overall risk level of failure of the device under test under the combined effects of acoustic and electromagnetic environments. Finally, the sensitivity threshold information, failure boundary information, and composite environment failure probability are used together as test results. The environmental adaptability of the device under test can be described from three levels: the location where the device begins to show a sensitive response, the environmental boundary from normal to failure state, and the failure risk in the composite environment. Compared with only giving a conclusion on whether a single joint test passed, this can more completely reflect the device's tolerance characteristics to acoustic and electromagnetic composite environments.

[0069] Preferably, the step of analyzing the set of sensitive environmental parameters to obtain the sensitivity threshold information of the device under test under the combined effects of acoustic and electromagnetic environments, and obtaining the failure boundary information corresponding to the device under test based on the set of failure environmental parameters, includes: Extract the environmental parameter values ​​and composite response features corresponding to each combination of environmental parameters in the set of sensitive environmental parameters, and arrange the corresponding composite response features according to the order of parameter value changes of at least one of the environmental parameters; The positions where the preset changes occur in the composite response features after positioning are determined, and the environmental parameter values ​​at the corresponding positions are recorded to obtain multiple sensitive threshold parameters; According to at least one of the electromagnetic field strength, sound pressure level, modulation method and noise type corresponding to each of the aforementioned sensitive threshold parameters, multiple sensitive threshold parameters are combined to form a sensitive threshold surface corresponding to the device under test; The electromagnetic field strength and sound pressure level corresponding to each failure state are extracted from the set of failure environment parameters, and combined with the electromagnetic field strength and sound pressure level corresponding to the non-failure state adjacent to each failure state to obtain multiple combinations of failure boundary parameters. Based on the correspondence between electromagnetic field strength and sound pressure level in each of the failure boundary parameter combinations, the failure boundary information corresponding to the device under test is formed.

[0070] Specifically, the sensitive environmental parameter set stores multiple sets of acoustic and electrical environmental conditions corresponding to when the device under test has shown significant response changes. Therefore, when analyzing this set, the electromagnetic field strength, sound pressure level, modulation method, noise type, and other parameter values ​​in each set of environmental parameters, along with the corresponding composite response characteristics, can be extracted together. At least one continuously variable parameter can be selected as the sorting criterion. For example, while keeping the modulation method and noise type constant, the composite response characteristics can be arranged from low to high electromagnetic field strength, or arranged in the order of sound pressure level changes while keeping the electromagnetic conditions basically consistent. This forms a data sequence with a clear sequential relationship between environmental parameter changes and device response changes. In this sequence, when the composite response characteristics change from their original state to a state that meets the preset change conditions, the environmental parameter value corresponding to the change position can be recorded. This parameter value reflects the critical condition when the device begins to show a sensitive response to the current acoustic and electrical environment. Repeating this process for different sound pressure levels, electromagnetic field strengths, modulation methods, or noise types yields multiple sensitive threshold parameters.

[0071] Since the sensitivity threshold is not determined by a single environmental factor, but may change with the combination of electromagnetic field strength and sound pressure level, as well as different modulation methods and noise types, multiple sensitivity threshold parameters can be summarized according to their corresponding environmental parameter combinations. This allows the sensitive critical positions under different acoustic and electrical environmental conditions to jointly constitute the sensitivity threshold surface of the device, thereby reflecting the range of changes in the device's sensitivity under various composite environmental conditions. Existing testing schemes obtain the device's sensitivity threshold surface by changing the electromagnetic field strength, sound pressure level, modulation method, and noise type and repeatedly performing acoustic and electrical joint tests. This analysis is accomplished by utilizing the corresponding changes between multiple sets of environmental parameters and the device response.

[0072] To obtain the failure boundary, it is necessary to further utilize the already screened set of failure environment parameters to extract the electromagnetic field strength and sound pressure level corresponding to the failure state of the equipment. Then, in the existing multiple sets of variable parameter test data, we need to find the non-failure test states that are adjacent to the failure state in the direction of parameter change. For example, when the sound pressure level remains constant while the electromagnetic field strength is gradually increased, the last non-failure test point and the subsequent failure test point can be used as a set of boundary references. The same method can be used when the electromagnetic field strength remains similar while the sound pressure level is changed. The acoustic and electrical parameters corresponding to each set of adjacent failure states and non-failure states form the failure boundary parameter combination. By combining multiple boundary parameters obtained under different test conditions and organizing them according to the correspondence between electromagnetic field strength and sound pressure level, the boundary information of the equipment entering the failure region from the non-failure region can be formed. Furthermore, the boundary can be represented by electromagnetic field strength and sound pressure level as two parameter dimensions. In this way, the sensitive threshold surface can be used to describe the position where the equipment begins to show obvious response changes, and the failure boundary can be used to further describe the critical range of the equipment from the still working state to the failure state. This gives the two types of test results different evaluation meanings and is consistent with the technical content of obtaining the sensitive threshold surface in the composite environment test and forming the EUT failure boundary with electromagnetic field strength and sound pressure level.

[0073] Example 2 Please see Figure 4 This invention provides a simulation testing system for devices in a combined acoustic and electromagnetic environment, used to implement the simulation testing method for devices in a combined acoustic and electromagnetic environment as described in Embodiment 1. The system includes: An electromagnetic signal generation module is used to apply a target electromagnetic environment signal to the target test area of ​​the anechoic chamber, and to form a reproduced electromagnetic environment in the target test area according to the adjustment of the electromagnetic signal output parameters. The field strength calibration module is used to obtain the actual electromagnetic environment parameters corresponding to the target test area, so as to adjust the electromagnetic signal output parameters of the electromagnetic signal generation module according to the actual electromagnetic environment parameters. An acoustic generation module is used to apply a target acoustic environment signal to the target test area and to form a reproduced acoustic environment in the target test area according to the adjustment of the acoustic signal output parameters; An acoustic calibration module is used to acquire the actual acoustic environment parameters corresponding to the target test area, so as to adjust the acoustic signal output parameters of the acoustic generation module according to the actual acoustic environment parameters; The device under test monitoring module is used to acquire response data corresponding to the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment, and the composite environment formed by the reproduced electromagnetic environment and the reproduced acoustic environment, respectively.

[0074] Preferably, the electromagnetic signal generation module includes a signal generator, a first power amplifier, and a transmitting antenna connected in sequence. The signal generator is used to generate an electromagnetic environment signal, the first power amplifier is used to amplify the electromagnetic environment signal, and the transmitting antenna is used to transmit the amplified electromagnetic environment signal to the target test area. The field strength calibration module includes a field strength probe, an optical fiber transmission unit, and a spectrum analyzer. The field strength probe is used to collect the electromagnetic field strength within the target test area. The optical fiber transmission unit is used to transmit the field strength data collected by the field strength probe. The spectrum analyzer is used to determine the actual electromagnetic environment parameters based on the field strength data. The acoustic generation module includes an audio analyzer, a second power amplifier, and a speaker array. The audio analyzer is used to output an acoustic environment signal, the second power amplifier is used to amplify the acoustic environment signal, and the speaker array is used to play the amplified acoustic environment signal to the target test area. The acoustic calibration module includes a microphone, a sound level meter, and a multi-channel analyzer. The microphone is used to collect acoustic signals within the target test area, and the sound level meter and the multi-channel analyzer are used to determine the actual acoustic environment parameters based on the acoustic signals. The monitoring module for the device under test includes an optical fiber monitoring unit and a data acquisition unit. The optical fiber monitoring unit is used to monitor the working status of the device under test under different test environments, and the data acquisition unit is used to collect the corresponding response data of the device under test.

[0075] Specifically, the simulation testing system for equipment in a combined acoustic and electromagnetic environment uses the target test area within an anechoic chamber as the actual area where the acoustic environment, electromagnetic environment, and the combined environment of the two interact. Each functional module works collaboratively around three stages: environment generation, environment calibration, and equipment response monitoring. Specifically, the electromagnetic signal generation module is responsible for generating the electromagnetic excitation required for the test. Its signal generator can output time-domain waveforms acquired from the external field or electromagnetic environment signals such as amplitude modulation, frequency modulation, and pulse modulation selected according to preset electromagnetic compatibility standards. After power enhancement by the first power amplifier, the signal is radiated towards the target test area by the transmitting antenna, creating a corresponding electromagnetic field in the target test area. The field strength calibration module is used to obtain the electromagnetic field in the actual area where the equipment under test is located. In the actual state of the anechoic chamber, the field strength probe can collect electromagnetic fields at different locations within the target test area. The obtained field strength data is transmitted to the spectrum analyzer through an optical fiber transmission unit, thereby reducing the additional disturbances to the electromagnetic field distribution in the anechoic chamber caused by metal wires or ordinary electrical connections. The spectrum analyzer can obtain the field strength, peak field strength, average field strength, and frequency domain variation information corresponding to each frequency point based on the collected data, and reflect the field strength distribution within the target test area by combining data from different measurement locations. During the continuous wave calibration stage, multiple preset frequency points can be scanned by the field strength probe, and the field strength uniformity can be evaluated using the measurement results. The output of the electromagnetic signal generation module can be adjusted according to the deviation between the actual field strength and the target field strength, so that the electromagnetic environment within the target test area meets the preset reproduction requirements.

[0076] The acoustic generation module and the electromagnetic signal generation module adopt a relatively independent environmental generation link. The audio analyzer is used to generate white noise, pink noise, or output pre-recorded acoustic waveforms such as aircraft cabin noise or vehicle driving noise. The second power amplifier amplifies the corresponding acoustic signals, and then the loudspeaker array plays them to the target test area, thereby forming the sound field to be reproduced at the location of the device under test. The acoustic calibration module collects actual acoustic signals through microphones arranged in the target test area. The microphones can be set in the same or similar area as the field strength probe, so that the obtained acoustic parameters and electromagnetic parameters reflect the environmental state in the same test space as much as possible. The sound level meter can be used to obtain the actual sound pressure level. The multi-channel analyzer can further perform spectrum analysis on the collected acoustic signals, thereby obtaining the actual acoustic environment parameters used to evaluate the degree of acoustic environment reproduction. The second power amplifier or audio output can be adjusted according to the deviation between the actual sound pressure level and the target sound pressure level, so that a reproduced acoustic environment that meets the preset requirements is formed in the target test area. After completing the electromagnetic and acoustic environment calibrations, the electromagnetic signal generation module can be activated alone, the acoustic generation module can be activated alone, or both can be activated simultaneously, thereby establishing a separate electromagnetic environment, a separate acoustic environment, and a composite environment where acoustic and electromagnetic coexist. The device under test monitoring module continuously acquires the device's operating status under the above different test conditions. The fiber optic monitoring unit is used to monitor whether the device under test experiences changes in its operating status such as bit errors, performance degradation, or restarts, while minimizing the impact of the monitoring link on the electromagnetic environment of the anechoic chamber. The data acquisition unit is used to synchronously acquire the corresponding performance items and response data, and save the test data under different environmental conditions separately, so as to compare the differences between the device responses under electromagnetic effects only, acoustic effects only, and combined acoustic and electrical effects.

[0077] Through the cooperation of the above modules, the system does not simply set up electromagnetic and acoustic generating devices in a dark room at the same time. Instead, it uses the field strength calibration module and the acoustic calibration module to measure, provide feedback and adjust the electromagnetic and acoustic environments formed in the actual area where the device under test is located. Then, the device under test monitoring module collects the device response under different environmental conditions at a unified test location. This provides a stable and comparable test basis for further analysis of the synergistic response generated by the combined effect of the acoustic and electromagnetic environments, conducting repeated tests of parameters such as electromagnetic field strength and sound pressure level, and obtaining the device sensitivity threshold, failure boundary and failure probability.

[0078] In summary, the simulation testing method and system for devices in a combined acoustic and electromagnetic environment provided by this invention first acquires the target electromagnetic environment signal and the target acoustic environment signal corresponding to the target application scenario, and determines the corresponding target electromagnetic reproduction parameters and target acoustic reproduction parameters respectively, using the actual environmental characteristics of the target application scenario as the basis for reproduction in the anechoic chamber; then, the target electromagnetic environment signal and the target acoustic environment signal are applied to the target test area respectively, and the actually acquired electromagnetic environment parameters and acoustic environment parameters are compared with the corresponding target reproduction parameters. The signal output is adjusted according to the difference between the two, thereby forming a reproduced electromagnetic environment and a reproduced acoustic environment that meet the corresponding reproduction conditions in the target test area, improving the consistency between the anechoic chamber simulation environment and the target application scenario; based on this, the device under test is placed in the reproduced electromagnetic environment, the reproduced acoustic environment, and the combined environment of the two. The test is conducted in a composite environment to obtain corresponding first, second, and third response data. By comparing the third response data in the composite environment with the response data in two single environments, the composite response characteristics generated when the acoustic and electromagnetic environments act together on the device under test are determined. This avoids the problem that a single electromagnetic test or a single acoustic test is insufficient to reflect the actual composite environment response of the device. Furthermore, by changing the environmental parameters corresponding to the reproduced electromagnetic and acoustic environments, multiple sets of environmental parameter combinations are formed. By combining the composite response characteristics under different parameter combinations, the sensitivity threshold and failure boundary of the device under test are determined. This allows for a more comprehensive evaluation of the environmental adaptability and failure characteristics of the device under test under different acoustic and electromagnetic composite conditions, realizing the simulation of the acoustic and electromagnetic composite environment in the target application scenario and the evaluation of the composite environment response characteristics of the device under test.

[0079] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0080] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0081] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0082] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0083] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0084] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0085] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A method for simulating and testing equipment in a combined acoustic and electromagnetic environment, characterized in that, The method includes: Acquire the target electromagnetic environment signal, target acoustic environment signal, preset target electromagnetic reproduction parameters, and target acoustic reproduction parameters corresponding to the target application scenario; Within the preset target test area, the target electromagnetic environment signal and the target acoustic environment signal are applied respectively to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters. Based on the parameter difference between the actual electromagnetic environment parameters and the target electromagnetic reproduction parameters, and combined with the parameter difference between the actual acoustic environment parameters and the target acoustic reproduction parameters, the outputs of the target electromagnetic environment signal and the target acoustic environment signal are adjusted respectively to obtain a reproduced electromagnetic environment and a reproduced acoustic environment that meet preset environmental reproduction conditions. The preset environmental reproduction conditions include that the parameter difference between the actual electromagnetic environment parameters and the target electromagnetic reproduction parameters is 0 and the parameter difference between the actual acoustic environment parameters and the target acoustic reproduction parameters is 0. The device under test is placed in the target test area, and the device under test is tested in the reproduced electromagnetic environment, the reproduced acoustic environment and the composite environment formed by the two, respectively, to obtain the corresponding first response data, second response data and third response data. Based on the differences between the third response data and the first and second response data, the composite response characteristics of the device under test in the composite environment are determined. The parameters of the reproduced electromagnetic environment and the reproduced acoustic environment are adjusted, and the electromagnetic environment and acoustic environment after parameter adjustment are used as the new reproduced electromagnetic environment and the new reproduced acoustic environment. The process returns to setting the device under test in the target test area, and testing the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment and the composite environment formed together, respectively, to obtain the corresponding first response data, second response data and third response data, until a preset number of composite response features are obtained. Data analysis and statistics are performed on the environmental parameters of each of the reproduced electromagnetic environments, the environmental parameters of each of the reproduced acoustic environments, and the corresponding composite response characteristics to determine the test results of the device under test.

2. The simulation test method for the device under a combined acoustic and electromagnetic environment according to claim 1, characterized in that, The acquisition of the target electromagnetic environment signal, target acoustic environment signal, preset target electromagnetic reproduction parameters, and target acoustic reproduction parameters corresponding to the target application scenario includes: In the target application scenario, the time-domain signal corresponding to the electromagnetic environment is collected to obtain the target electromagnetic environment signal; or, at least one modulation signal is selected according to a preset electromagnetic compatibility standard to establish an electromagnetic signal library, and the target electromagnetic environment signal is obtained from the electromagnetic signal library. The modulation signal includes at least one of amplitude modulation signal, frequency modulation signal and pulse modulation signal. Obtain the target field strength parameters corresponding to the target electromagnetic environment signal, and determine the target electromagnetic reproduction parameters based on the target field strength parameters; The pre-recorded acoustic waveform corresponding to the target application scenario is obtained as the target acoustic environment signal; The target acoustic reproduction parameters are determined based on the target sound pressure level corresponding to the target acoustic environment signal.

3. The simulation testing method for the device under a combined acoustic and electromagnetic environment according to claim 1, characterized in that, Before applying the target electromagnetic environment signal and the target acoustic environment signal respectively within the preset target test area to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters, the method further includes: A transmitting antenna is set up within the preset target test area, and the transmitting antenna is controlled to transmit continuous wave signals at multiple preset frequency points respectively; The field strength of the continuous wave corresponding to each preset frequency point is measured to obtain the field strength distribution corresponding to each preset frequency point; Based on the field strength distribution corresponding to each preset frequency point, determine the actual continuous wave field strength and field strength uniformity at each preset frequency point; Based on the difference between the actual continuous wave field strength at each preset frequency point and the corresponding preset target field strength, the output of the continuous wave signal is adjusted, and the corresponding field strength distribution is re-acquired after adjustment, until the actual continuous wave field strength at each preset frequency point reaches the corresponding preset target field strength. Based on the field strength distribution and field strength uniformity corresponding to each preset frequency point after adjustment, the continuous wave calibration result corresponding to the target test area is obtained.

4. The simulation test method for the device under a combined acoustic and electromagnetic environment according to claim 3, characterized in that, The step of applying the target electromagnetic environment signal and the target acoustic environment signal respectively within the preset target test area to obtain the actual electromagnetic environment parameters and the actual acoustic environment parameters includes: Based on the continuous wave calibration results, the target electromagnetic environment signal is applied within the target test area; Measure the peak field strength and average field strength corresponding to the target electromagnetic environment signal within the target test area, and record the field strength distribution and time waveform corresponding to the target electromagnetic environment signal; The actual electromagnetic environment parameters are determined based on the peak field strength, the average field strength, the field strength distribution, and the time waveform. A microphone is placed within the target test area, and the target acoustic environment signal is applied through a loudspeaker array. The sound pressure level and spectrum within the target test area are obtained through the microphone, and the actual acoustic environment parameters are determined based on the sound pressure level and the spectrum.

5. The simulation test method for the device under a combined acoustic and electromagnetic environment according to claim 1, characterized in that, The step of setting the device under test in the target test area and testing the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment, and the combined environment to obtain corresponding first response data, second response data, and third response data includes: Based on the preset performance indicators corresponding to the device under test, obtain the test performance items corresponding to the device under test; The test performance items are tested under the conditions of applying only the reproduced electromagnetic environment, applying only the reproduced acoustic environment, and applying both the reproduced electromagnetic environment and the reproduced acoustic environment simultaneously, respectively, to obtain the first test result, the second test result, the third test result corresponding to the test performance items, and the first abnormal state information, the second abnormal state information, and the third abnormal state information corresponding to the device under test. The first test results, the second test results, and the third test results are organized and analyzed to extract the performance change information of each test performance item under the corresponding environmental conditions. Each of the performance change information is associated with the corresponding first abnormal state information, second abnormal state information and third abnormal state information and recorded to form the first response data, the second response data and the third response data.

6. The simulation test method for the device under a combined acoustic and electromagnetic environment according to claim 5, characterized in that, Determining the composite response feature based on the differences between the third response data and the first and second response data respectively includes: Extract the first performance test information, the second performance test information, and the third performance test information corresponding to the same test performance item from the first response data, the second response data, and the third response data, respectively. The third performance test information is compared with the first performance test information and the second performance test information to obtain the response difference information of the device under test in the composite environment relative to the individual electromagnetic environment and the individual acoustic environment. The response difference information is obtained to characterize the synergistic effect of the combined action of the reproduced electromagnetic environment and the reproduced acoustic environment, and the performance change corresponding to the synergistic effect is used as the composite response feature.

7. The simulation test method for the device under a combined acoustic and electromagnetic environment according to any one of claims 1-6, characterized in that, The step of performing data analysis and statistics on the environmental parameters of each of the reproduced electromagnetic environments, the environmental parameters of each of the reproduced acoustic environments, and the corresponding composite response characteristics to determine the test results of the device under test includes: The environmental parameters of the reproduced electromagnetic environment, the environmental parameters of the reproduced acoustic environment, and the composite response characteristics corresponding to each composite environment test are combined according to the corresponding relationship to form multiple sets of composite environment test data. The multiple sets of composite environmental test data are classified according to at least one environmental parameter, and the composite response characteristics corresponding to different combinations of environmental parameters are compared to obtain the response change information of the composite response characteristics as the environmental parameters change. The environmental parameters include at least one of electromagnetic field strength, sound pressure level, modulation method and noise type. From the response change information, filter the environmental parameter combinations corresponding to the preset changes in the composite response features to form a sensitive environmental parameter set; The sensitive environmental parameter set is analyzed to obtain the sensitivity threshold information of the device under test under the combined effects of acoustic and electromagnetic environments; From the composite environment test data of each group, filter the combination of environmental parameters corresponding to the failure state of the device under test to obtain the failure environment parameter set; Based on the set of failure environment parameters, the failure boundary information corresponding to the device under test is obtained, and the failure status of the device in each group of composite environment test data is statistically analyzed to obtain the failure probability of the composite environment. The sensitivity threshold information, the failure boundary information, and the failure probability of the composite environment are used as the test results of the device under test.

8. The simulation test method for the device under a combined acoustic and electromagnetic environment according to claim 7, characterized in that, The step of analyzing the set of sensitive environmental parameters to obtain the sensitivity threshold information of the device under test under the combined effects of acoustic and electromagnetic environments, and obtaining the failure boundary information corresponding to the device under test based on the set of failure environmental parameters, includes: Extract the environmental parameter values ​​and composite response features corresponding to each combination of environmental parameters in the set of sensitive environmental parameters, and arrange the corresponding composite response features according to the order of parameter value changes of at least one of the environmental parameters; The positions where the preset changes occur in the composite response features after positioning are determined, and the environmental parameter values ​​at the corresponding positions are recorded to obtain multiple sensitive threshold parameters; According to at least one of the electromagnetic field strength, sound pressure level, modulation method and noise type corresponding to each of the aforementioned sensitive threshold parameters, multiple sensitive threshold parameters are combined to form a sensitive threshold surface corresponding to the device under test; The electromagnetic field strength and sound pressure level corresponding to each failure state are extracted from the set of failure environment parameters, and combined with the electromagnetic field strength and sound pressure level corresponding to the non-failure state adjacent to each failure state to obtain multiple combinations of failure boundary parameters. Based on the correspondence between electromagnetic field strength and sound pressure level in each of the failure boundary parameter combinations, the failure boundary information corresponding to the device under test is formed.

9. A simulation testing system for equipment in a combined acoustic and electromagnetic environment, characterized in that, A method for simulating the testing of the device as described in any one of claims 1-8 in a combined acoustic and electromagnetic environment, the system comprising: An electromagnetic signal generation module is used to apply a target electromagnetic environment signal to the target test area of ​​the anechoic chamber, and to form a reproduced electromagnetic environment in the target test area according to the adjustment of the electromagnetic signal output parameters. The field strength calibration module is used to obtain the actual electromagnetic environment parameters corresponding to the target test area, so as to adjust the electromagnetic signal output parameters of the electromagnetic signal generation module according to the actual electromagnetic environment parameters. An acoustic generation module is used to apply a target acoustic environment signal to the target test area and to form a reproduced acoustic environment in the target test area according to the adjustment of the acoustic signal output parameters; An acoustic calibration module is used to acquire the actual acoustic environment parameters corresponding to the target test area, so as to adjust the acoustic signal output parameters of the acoustic generation module according to the actual acoustic environment parameters; The device under test monitoring module is used to acquire response data corresponding to the device under test in the reproduced electromagnetic environment, the reproduced acoustic environment, and the composite environment formed by the reproduced electromagnetic environment and the reproduced acoustic environment, respectively.

10. The simulation testing system for the device under a combined acoustic and electromagnetic environment according to claim 9, characterized in that, The electromagnetic signal generation module includes a signal generator, a first power amplifier, and a transmitting antenna connected in sequence. The signal generator is used to generate an electromagnetic environment signal, the first power amplifier is used to amplify the electromagnetic environment signal, and the transmitting antenna is used to transmit the amplified electromagnetic environment signal to the target test area. The field strength calibration module includes a field strength probe, an optical fiber transmission unit, and a spectrum analyzer. The field strength probe is used to collect the electromagnetic field strength within the target test area. The optical fiber transmission unit is used to transmit the field strength data collected by the field strength probe. The spectrum analyzer is used to determine the actual electromagnetic environment parameters based on the field strength data. The acoustic generation module includes an audio analyzer, a second power amplifier, and a speaker array. The audio analyzer is used to output an acoustic environment signal, the second power amplifier is used to amplify the acoustic environment signal, and the speaker array is used to play the amplified acoustic environment signal to the target test area. The acoustic calibration module includes a microphone, a sound level meter, and a multi-channel analyzer. The microphone is used to collect acoustic signals within the target test area, and the sound level meter and the multi-channel analyzer are used to determine the actual acoustic environment parameters based on the acoustic signals. The monitoring module for the device under test includes an optical fiber monitoring unit and a data acquisition unit. The optical fiber monitoring unit is used to monitor the working status of the device under test under different test environments, and the data acquisition unit is used to collect the corresponding response data of the device under test.

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