Performance test method for transmission system of special vehicle in time-varying vibration environment

Abstract

The invention provides a special vehicle transmission system performance test method in a time-varying vibration environment and related equipment thereof. The method comprises the following steps: acquiring time-varying vibration environment parameters of a target vehicle under a target working condition; generating a corresponding vibration loading parameter based on the time-varying vibration environment parameter; according to the vibration loading parameter, performing a time-varying vibration test on a to-be-tested transmission system of the target vehicle to obtain multi-source test data; performing performance feature extraction processing on the multi-source test data to obtain performance feature parameters; and generating a corresponding performance evaluation report based on the performance characteristic parameters. Through the steps of the method, the time-varying vibration factor matched with the actual working condition can be introduced in the testing process, comprehensive evaluation of the operation performance of the special vehicle transmission system in the dynamic vibration environment is achieved, and therefore the representativeness and reliability of the testing result to the actual service working condition are improved.

Description

Technical Field

[0001] This invention relates to the field of intelligent testing, and in particular to a method, apparatus, electronic device and storage medium for testing the performance of a special vehicle transmission system under time-varying vibration environment. Background Technology

[0002] Special vehicles typically operate in complex and variable working conditions. During their journey, they are subjected to the combined effects of road surface unevenness, changes in vehicle posture, and load fluctuations, causing the vehicle's transmission system to be subjected to a time-varying vibration environment for extended periods. The transmission system includes key components such as the engine, gearbox, transfer case, drive shaft, and drive axle, and its operating condition directly affects the vehicle's power performance, reliability, and service life.

[0003] Existing transmission system performance testing methods are mostly based on fixed test benches. Typically, under relatively stable environmental conditions, a constant or quasi-steady-state power load is applied to the transmission system, and parameters such as speed and torque are collected to evaluate its performance. While these testing methods can reflect the basic performance indicators of the transmission system under ideal or steady-state conditions, they generally ignore the influence of time-varying vibration environments experienced by vehicles during actual driving. Therefore, they fail to accurately reflect the impact of vibration conditions on the power transmission characteristics, stability, and performance degradation behavior of the transmission system.

[0004] Furthermore, in existing testing schemes, vibration conditions and performance evaluations are often independent of each other, lacking a systematic testing process based on the vibration characteristics of real working conditions. This leads to discrepancies between test data and actual working conditions, which in turn affects the accuracy of performance evaluation results and their engineering reference value.

[0005] Therefore, there is an urgent need for a method that can combine the vibration characteristics of actual working conditions to conduct time-varying vibration tests on the transmission system of special vehicles, and comprehensively evaluate its operating performance based on the test data, so as to make up for the shortcomings of existing technologies in performance testing under dynamic vibration environments. Summary of the Invention

[0006] This invention provides a method for testing the performance of a special vehicle transmission system under time-varying vibration conditions, in order to address the shortcomings of existing transmission system performance testing methods in dynamic vibration environments.

[0007] In a first aspect, the present invention provides a method for testing the performance of a special vehicle transmission system under time-varying vibration conditions, the method comprising the following steps: Obtain time-varying vibration environment parameters of the target vehicle under target operating conditions; Based on the time-varying vibration environment parameters, corresponding vibration loading parameters are generated; Based on the vibration loading parameters, time-varying vibration tests are performed on the transmission system of the target vehicle to obtain multi-source test data. The multi-source test data is subjected to performance feature extraction processing to obtain performance feature parameters; Based on the aforementioned performance characteristic parameters, a corresponding performance evaluation report is generated.

[0008] Optionally, before obtaining the time-varying vibration environment parameters of the target vehicle under the target operating conditions, the method further includes: Obtain the vehicle system parameters and transmission system parameters of the target vehicle; Based on the vehicle system parameters and transmission system parameters, a coupled dynamic equation is constructed, and the coupling relationship between the vehicle system and the transmission system is determined. Based on the aforementioned coupled dynamic equations and coupling relationships, a coupled dynamic model is established.

[0009] Optionally, obtaining the time-varying vibration environment parameters of the target vehicle under the target operating conditions includes: By using a pre-set vibration database, road excitation data and / or vehicle response data corresponding to the target working condition are obtained; Based on the road excitation data and / or vehicle response data, time-varying vibration environment parameters are determined. These time-varying vibration environment parameters include vibration acceleration time history data, vibration displacement time history data, vibration velocity time history data, attitude angle change data, power spectral density data, and statistical parameters.

[0010] Optionally, generating corresponding vibration loading parameters based on the time-varying vibration environment parameters includes: The time-varying vibration environment parameters are spectrally converted to obtain the target vibration spectrum; Based on the target vibration spectrum, parameterized mapping is performed to determine the vibration loading parameters, which include loading amplitude, loading frequency, phase, loading duration, and degree of freedom allocation.

[0011] Optionally, the step of performing time-varying vibration testing on the transmission system of the target vehicle based on the vibration loading parameters to obtain multi-source test data includes: Based on the vibration loading parameters, a set of modes to be loaded is determined, including mode shape data, natural frequency data, and damping ratio data corresponding to different orders; Obtain the modal parameters corresponding to the transmission system under test, wherein the modal parameters include at least one of the mode shape, natural frequency, and damping ratio; The modal set and modal parameters are processed using the modal superposition method to generate a vibration loading signal; A time-varying vibration excitation is applied to the transmission system under test according to the vibration loading signal, and multi-source test data are collected simultaneously during the application of the time-varying vibration excitation.

[0012] Optionally, the step of extracting performance features from the multi-source test data to obtain performance feature parameters includes: The multi-source test data is preprocessed and time consistency processed to obtain aligned data; Based on the alignment data, candidate feature parameters corresponding to each data source are extracted respectively. The candidate feature parameters include at least one type of time-domain features, frequency-domain features, and / or time-frequency-domain features. Assign fusion weights to each data source, and perform fusion processing on the candidate feature parameters based on a preset feature fusion algorithm to obtain performance feature parameters.

[0013] Optionally, generating a corresponding performance evaluation report based on the performance characteristic parameters includes: Based on the aforementioned performance characteristic parameters, the operating performance status of the transmission system under test is evaluated under the time-varying vibration environment, and at least one performance evaluation result is obtained. The performance evaluation results are compared with preset evaluation criteria to determine the state category of the transmission system under test. The state category includes at least one of normal state, performance degradation state and / or abnormal state. Based on the stated state category, a performance evaluation conclusion is generated, and a performance evaluation report is formed.

[0014] Secondly, the present invention also provides a performance testing device for a special vehicle transmission system under time-varying vibration environment, the performance testing device for a special vehicle transmission system under time-varying vibration environment comprising: The first acquisition module is used to acquire the time-varying vibration environment parameters of the target vehicle under the target working conditions; The first generation module is used to generate corresponding vibration loading parameters based on the time-varying vibration environment parameters; The first test module is used to perform time-varying vibration tests on the transmission system of the target vehicle according to the vibration loading parameters, and obtain multi-source test data. The first extraction module is used to perform performance feature extraction processing on the multi-source test data to obtain performance feature parameters; The second generation module is used to generate a corresponding performance evaluation report based on the performance characteristic parameters.

[0015] Thirdly, the present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps in the method for testing the performance of a special vehicle transmission system under time-varying vibration environment provided by the present invention.

[0016] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps in the method for testing the performance of a special vehicle transmission system under time-varying vibration environment provided by the invention.

[0017] This invention acquires time-varying vibration environment parameters of a target vehicle under target operating conditions; generates corresponding vibration loading parameters based on these parameters; performs time-varying vibration tests on the target vehicle's transmission system according to the vibration loading parameters, obtaining multi-source test data; extracts performance features from the multi-source test data to obtain performance feature parameters; and generates a corresponding performance evaluation report based on these performance feature parameters. Through these steps, time-varying vibration factors matching actual operating conditions can be introduced into the testing process, enabling a comprehensive evaluation of the performance of special vehicle transmission systems under dynamic vibration environments, thereby improving the representativeness and reliability of the test results for actual service conditions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of a method for testing the performance of a special vehicle transmission system under time-varying vibration environment, provided by an embodiment of the present invention. Figure 2 This is a schematic diagram of another performance testing device for a special vehicle transmission system under time-varying vibration environment provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, Figure 1 This is a flowchart of a method for testing the performance of a special vehicle transmission system under time-varying vibration conditions, provided by an embodiment of the present invention. The method includes the following steps: 101. Obtain the time-varying vibration environment parameters of the target vehicle under the target operating conditions.

[0022] In this embodiment of the invention, the above-mentioned performance testing method for special vehicle transmission systems under time-varying vibration environment can be applied to a performance testing platform for special vehicle transmission systems under time-varying vibration environment. The performance testing platform for special vehicle transmission systems under time-varying vibration environment has functions such as time-varying vibration data processing, time-varying vibration data transmission and reception, and time-varying vibration data memory storage. It can be built based on a server or server cluster. The server or server cluster can be an electronic device with time-varying vibration data processing capability.

[0023] The aforementioned performance testing platform for special vehicle transmission systems under time-varying vibration environments can also be equipped with a performance testing system for special vehicle transmission systems under time-varying vibration environments.

[0024] The aforementioned performance testing system for the transmission system of special vehicles under time-varying vibration conditions includes a multi-axis vibration excitation unit, a transmission system mounting platform, a dynamic load simulation unit, a multi-source data acquisition unit, a time-varying vibration control unit, and a performance evaluation and analysis unit. The time-varying vibration simulation can be achieved through the following coupling relationship:

[0025] in, The total vibration acceleration, Let i be the amplitude of the i-th order vibration. The attenuation coefficient is... The vibration frequency, The phase angle, For time-varying standard deviation, It is a random process.

[0026] The aforementioned multi-axis vibration excitation unit includes a six-degree-of-freedom hydraulic excitation platform, whose kinematic model is as follows:

[0027] in For Jacobian matrices, For the platform Euler angle, It outputs force to each actuator.

[0028] The above dynamic load simulation unit uses electric inertia simulation technology, and its dynamic adjustment formula for moment of inertia is:

[0029] in For the equivalent moment of inertia, Based on inertia, This represents the amplitude of inertia fluctuation. For fluctuation frequency, is the damping coefficient.

[0030] The above-mentioned multi-source data acquisition unit adopts a synchronous acquisition strategy, and its synchronization error control model is as follows:

[0031] in For synchronization error, This is the initial error tolerance. Here, is the convergence coefficient, and N is the total number of sampling points within the statistical window. For the ideal or reference sampling time of the k-th data point, This represents the actual sampling time of the k-th data point.

[0032] The aforementioned time-varying vibration control unit employs an adaptive sliding mode control algorithm, and its control law is as follows:

[0033] The sliding surface is designed as follows:

[0034] in, These are, respectively, control output, tracking error, proportional gain, integral gain, derivative gain, switching gain, sign function, sliding surface function, sliding surface coefficient 1, and sliding surface coefficient 2.

[0035] The above performance evaluation and analysis unit (6) includes a time-varying evaluation module for transmission efficiency, and its dynamic efficiency calculation formula is as follows:

[0036] in, This is the vibration influence coefficient. This represents the root mean square value of the vibration acceleration. It is the acceleration due to gravity. Instantaneous input power, This refers to the instantaneous output power.

[0037] The aforementioned target vehicles can refer to special vehicles whose transmission systems require performance testing and evaluation, such as engineering vehicles, special-operation vehicles, military vehicles, or other vehicle types operating under complex road and load conditions. It is understood that these target vehicles can be used to determine the vehicle category and typical usage scenarios corresponding to the tests, thereby providing a basis for subsequently determining the target operating conditions and vibration environment.

[0038] The aforementioned target operating conditions may refer to one or more combinations of operating states that the target vehicle may experience during actual use, used to characterize the typical operating conditions of the vehicle, including but not limited to vehicle speed range, load status, road surface type, and working mode.

[0039] For example, for engineering vehicles, target operating conditions may include heavy-load, low-speed driving conditions; for special-purpose vehicles, target operating conditions may include frequent start-stop or uneven road surface driving conditions.

[0040] The aforementioned time-varying vibration environment parameters can refer to a set of parameters used to describe the characteristics of the vibration environment of the transmission system of a target vehicle under target operating conditions as a function of time. Generally, these parameters can be obtained through actual vehicle testing, historical test data acquisition, or calculation based on simulation models. They include, but are not limited to, vibration acceleration time history, vibration displacement or velocity time history, power spectral density parameters as a function of time, and corresponding statistical characteristic parameters.

[0041] Furthermore, when direct and complete actual measurement is not possible or to improve the representativeness of parameters, the aforementioned test platform first establishes a coupled dynamic model before obtaining the time-varying vibration environment parameters. The road excitation / vehicle operating state corresponding to the target working condition is used as the model input, and the model outputs the vibration response of the transmission system mounting point or key parts (such as acceleration time history, displacement time history, attitude change, etc.). This output is used as the time-varying vibration environment parameters, or used to complete, remove anomalies and correct consistency of the measured time-varying vibration environment parameters.

[0042] 102. Generate corresponding vibration loading parameters based on time-varying vibration environment parameters.

[0043] In this embodiment of the invention, the vibration loading parameters mentioned above can refer to vibration excitation parameters that are converted from the time-varying vibration environment parameters and can be directly executed by the test platform.

[0044] In one possible embodiment, the special vehicle transmission system performance testing platform under time-varying vibration environment described above performs spectral and parameterization processing on the time-varying vibration environment parameters to determine the vibration loading parameters, including but not limited to loading amplitude, loading frequency, phase, loading duration, and loading direction or degree of freedom allocation.

[0045] Furthermore, after generating candidate vibration loading parameters, the performance testing platform for the special vehicle transmission system under the aforementioned time-varying vibration environment uses a coupled dynamics model to verify the consistency of the candidate loading parameters: the excitation corresponding to the candidate loading parameters is input into the model to obtain the predicted response, and the predicted response is compared with the response range corresponding to the target working condition; when the predicted response deviates from the target working condition range, the candidate loading parameters are recalibrated (e.g., the amplitude, frequency band energy distribution, phase or degree of freedom distribution are adjusted) until the preset consistency conditions are met.

[0046] 103. Based on the vibration loading parameters, time-varying vibration tests were performed on the transmission system of the target vehicle to obtain multi-source test data.

[0047] In this embodiment of the invention, the special vehicle transmission system performance testing platform under time-varying vibration environment described above can apply time-varying vibration excitation to the transmission system of the target vehicle under test according to the vibration loading parameters, and make the transmission system run and test under the vibration conditions. For example, time-varying vibration excitation can be applied to the transmission system while applying power loading, so that the transmission system is in an operating state similar to the actual working conditions.

[0048] The aforementioned multi-source test data can refer to a set of test data collected from multiple different types of data sources during time-varying vibration testing, including but not limited to vibration response data, rotational speed data, torque data, and displacement or attitude data.

[0049] Understandably, the aforementioned performance testing platform for special vehicle transmission systems under time-varying vibration environments comprehensively reflects the operating status of the transmission system under the combined effects of vibration and dynamic loading by synchronously collecting multiple types of data, avoiding the problem of insufficient information caused by a single data source and improving the comprehensiveness of performance analysis.

[0050] 104. Perform performance feature extraction processing on multi-source test data to obtain performance feature parameters.

[0051] In this embodiment of the invention, the aforementioned performance feature extraction process refers to the analysis and processing of the multi-source test data to extract key features that characterize the operating performance of the transmission system. Specifically, the aforementioned performance testing platform for special vehicle transmission systems under time-varying vibration environments can perform time consistency processing, statistical analysis, and frequency domain or time-frequency domain analysis on the multi-source test data to extract features reflecting vibration levels, power transmission states, and operational stability.

[0052] By using the methods and steps described above, a large amount of raw test data can be transformed into feature information with engineering significance, reducing the complexity of subsequent evaluation.

[0053] The aforementioned performance characteristic parameters can refer to the set of parameters obtained after performance characteristic extraction processing, used to characterize the operating performance of the transmission system. These parameters may include, but are not limited to, vibration characteristic parameters, dynamic characteristic parameters, and statistical characteristic parameters that reflect the stability or deterioration trend of the system.

[0054] 105. Generate corresponding performance evaluation reports based on performance characteristic parameters.

[0055] In this embodiment of the invention, the aforementioned performance evaluation report refers to the output of results generated based on the performance characteristic parameters, used to characterize the operating performance of the target vehicle transmission system under the target operating conditions. It may include, but is not limited to, test condition descriptions, performance characteristic parameter analysis results, and comprehensive evaluation conclusions on the operating status of the transmission system, such as normal operation, performance degradation, or the existence of abnormal risks.

[0056] In this embodiment of the invention, time-varying vibration environment parameters of the target vehicle under target operating conditions are obtained; based on the time-varying vibration environment parameters, corresponding vibration loading parameters are generated; according to the vibration loading parameters, time-varying vibration tests are performed on the transmission system of the target vehicle to be tested, obtaining multi-source test data; performance feature extraction processing is performed on the multi-source test data to obtain performance feature parameters; based on the performance feature parameters, a corresponding performance evaluation report is generated. Through the above method steps, time-varying vibration factors matching actual operating conditions can be introduced into the testing process, enabling a comprehensive evaluation of the operating performance of the special vehicle transmission system under dynamic vibration conditions, thereby improving the representativeness and reliability of the test results for actual service conditions.

[0057] Optionally, in the steps prior to obtaining the time-varying vibration environment parameters of the target vehicle under the target operating conditions, the vehicle system parameters and transmission system parameters of the target vehicle can also be obtained; based on the vehicle system parameters and transmission system parameters, coupled dynamic equations can be constructed, and the coupling relationship between the vehicle system and the transmission system can be determined; based on the coupled dynamic equations and the coupling relationship, a coupled dynamic model can be established.

[0058] In this embodiment of the invention, the above-mentioned vehicle system parameters refer to a set of parameters used to characterize the overall structure and vibration transmission path characteristics of the target vehicle. They are mainly used to describe how road excitation and vehicle operating state are transmitted to the transmission system through tires, suspension, and frame / body, including but not limited to the mass and moment of inertia of the frame or body, the equivalent stiffness and damping of the suspension, the equivalent stiffness and damping of the tires, the modal parameters of key parts of the frame, and the equivalent connection parameters of the transmission system mounting point or suspension structure.

[0059] The aforementioned transmission system parameters can refer to a set of parameters used to characterize the dynamic behavior of the transmission system under test. They are mainly used to describe the dynamic response characteristics of the transmission system under vibration and dynamic loading, including but not limited to the equivalent moment of inertia, torsional stiffness and damping, equivalent stiffness of gear meshing, bearing support stiffness and damping, and transmission clearance-related parameters of the engine, transmission, transfer case, drive shaft and drive axle assemblies.

[0060] The aforementioned coupled dynamics equations can refer to mathematical expressions established based on vehicle system parameters and transmission system parameters, used to uniformly describe the dynamic behavior of the vehicle system and transmission system under joint excitation. They can be obtained through the following formula:

[0061] Where M is the system mass matrix, C is the system damping matrix, K is the system stiffness matrix, and X is the system generalized coordinate vector. , For the first and second derivatives of the generalized coordinates, Froad is the road surface excitation vector, Fengine is the engine excitation vector, and Ftransmission is the internal excitation vector of the transmission system.

[0062] Specifically, the above coupled dynamic equations are used to describe how the vibration response of the vehicle system acts on the transmission system through the mounting interface under road surface excitation or equivalent excitation conditions, and how the dynamic reaction of the transmission system is fed back to the vehicle system.

[0063] The aforementioned coupling relationship refers to the interaction between the vehicle system and the transmission system at the physical connection interface. It establishes a correspondence between the motion state of the vehicle system and the motion state of the transmission system. This relationship is generally determined by the mounting points, suspensions, or support structures between the transmission system and the frame / chassis, and can manifest as at least one of mass coupling, damping coupling, and / or stiffness coupling. For example, the displacement or attitude changes generated by the frame under road surface excitation can be transmitted to the transmission system through suspension stiffness and damping, causing the transmission system to generate additional dynamic or angular displacements. Simultaneously, the reaction force generated during the operation of the transmission system can also be fed back to the frame structure through the aforementioned coupling relationship.

[0064] The specific form of the above coupled dynamics model can be obtained through the following equation:

[0065] Wherein, the subscript v represents the vehicle system, c represents the transmission system, Mvv, Cvv, and Kvv represent the mass, damping, and stiffness matrices of the vehicle subsystem, respectively, Mcc, Ccc, and Kcc represent the mass, damping, and stiffness matrices of the transmission subsystem, respectively, Mvc and Mcv represent the dynamic coupling between the vehicle and the transmission system due to the mass / inertia distribution, respectively, Mcv is the transpose of Mvc (the dynamic coupling of damping and stiffness is similar), represents the displacement, velocity, and acceleration of all degrees of freedom of the vehicle subsystem, represents the rotation / displacement, angular velocity / velocity, and angular acceleration / acceleration of all degrees of freedom of the transmission subsystem, represents the generalized force vector acting on the vehicle subsystem, and represents the generalized force vector acting on the transmission subsystem.

[0066] More specifically, the aforementioned coupled dynamics model can calculate the vibration response of the installation point or key parts of the transmission system under target working conditions, and use the calculation results as the basis for obtaining time-varying vibration environment parameters, or to verify and correct the measured vibration environment parameters.

[0067] Optionally, the step of obtaining the time-varying vibration environment parameters of the target vehicle under the target operating condition may further include obtaining road excitation data and / or vehicle response data corresponding to the target operating condition through a preset vibration database; and determining the time-varying vibration environment parameters based on the road excitation data and / or vehicle response data.

[0068] In this embodiment of the invention, the aforementioned time-varying vibration environment parameters may include, but are not limited to, vibration acceleration time history data, vibration displacement time history data, vibration velocity time history data, attitude angle change data, power spectral density data, and statistical parameters.

[0069] The aforementioned pre-set vibration database can refer to a pre-established and stored data set used to describe the vibration characteristics of different vehicle types, different working conditions and different road surface conditions. It can consist of historical real vehicle test data, test field test data, standard road spectrum data or simulation-generated data, and be classified and stored according to working condition labels such as vehicle type, load state, driving speed, and road surface type.

[0070] By setting up a preset vibration database, the performance testing platform for the transmission system of special vehicles under time-varying vibration environment can directly retrieve vibration-related data corresponding to the target operating conditions without real-time vehicle data acquisition.

[0071] The aforementioned road surface excitation data can refer to the basic data used to characterize the external excitation characteristics of the target vehicle under the target operating conditions. It is mainly used to describe the road surface roughness and the excitation input it generates to the vehicle, including but not limited to data on the change of road surface roughness with driving distance, equivalent road surface excitation spectrum data, or excitation time history data converted from road surface roughness.

[0072] The aforementioned vehicle response data may refer to the vibration response data of the target vehicle under the target working conditions to the aforementioned road surface excitation, which is used to describe the actual dynamic performance of the vehicle structure under external excitation, including but not limited to vibration response information collected at the mounting points of the vehicle frame, body or transmission system, such as vibration acceleration, displacement or attitude changes.

[0073] The aforementioned vibration acceleration time history data can refer to acceleration data that changes over time, used to characterize the change in vibration intensity experienced by the target vehicle or transmission system under the target operating conditions over time. It can be obtained by acceleration sensors installed on the chassis, transmission system mounting points, or key parts, or it can be directly retrieved from historical data stored in a preset vibration database.

[0074] The aforementioned vibration displacement time history data can refer to displacement data that changes over time, used to characterize the relative displacement changes of a vehicle or transmission system under vibration. It can also be obtained by measuring displacement sensors or by integrating vibration acceleration time history data.

[0075] The aforementioned vibration velocity time history data refers to velocity data that changes over time, used to characterize the energy transfer characteristics during vibration. It can be directly acquired by a velocity sensor or obtained by integrating the vibration acceleration time history data.

[0076] The aforementioned attitude angle variation data can refer to the data showing how the attitude angles (e.g., pitch, roll, and yaw angles) of a vehicle or transmission system change over time under vibration. This attitude angle variation data can be obtained through gyroscopes or attitude sensors, or it can be calculated from multi-point displacement data.

[0077] The aforementioned power spectral density data can refer to the spectral distribution data obtained by frequency domain analysis of vibration time history data. It is used to characterize the distribution of vibration energy in different frequency ranges. It can be obtained from vibration acceleration, displacement or velocity time history data through spectral analysis, or it can be directly retrieved from a preset vibration database.

[0078] The aforementioned statistical parameters can refer to the characteristic quantities obtained by statistical analysis of the aforementioned vibration time history data, which are used to summarize the overall characteristics of the vibration environment, including but not limited to mean, root mean square value, standard deviation, peak value, peak-to-peak value, and kurtosis.

[0079] In one possible embodiment, when the special vehicle transmission system performance testing platform under the aforementioned time-varying vibration environment acquires road excitation data, the testing platform can use the road excitation data as an external input condition, combine it with vehicle operating status information, and perform conversion processing on road unevenness or equivalent excitation to obtain vibration time history data or frequency domain data characterizing the vibration's time-varying characteristics. When vehicle response data is acquired, the testing platform can directly extract vibration time history data reflecting the vibration characteristics at the vehicle structure or transmission system mounting point based on the vehicle response data, and determine the aforementioned time-varying vibration environment parameters accordingly. In this embodiment, the special vehicle transmission system performance testing platform under the aforementioned time-varying vibration environment can also simultaneously utilize road excitation data and vehicle response data, and determine the time-varying vibration environment parameters of the target working condition by matching, fusing, or cross-verifying the two. For example, the vibration input characteristics can be determined through road excitation data, and the vibration characteristics can be corrected or constrained through vehicle response data. The time-varying vibration environment parameters determined in the above manner can reflect the vibration amplitude, spectral characteristics, and their time-varying patterns, thereby providing a reliable basis for subsequently generating vibration loading parameters.

[0080] Optionally, the step of generating corresponding vibration loading parameters based on time-varying vibration environment parameters may further include spectral conversion of the time-varying vibration environment parameters to obtain the target vibration spectrum; and parametric mapping based on the target vibration spectrum to determine the vibration loading parameters.

[0081] In this embodiment of the invention, the vibration loading parameters include, but are not limited to, loading amplitude, loading frequency, phase, loading duration, and degree of freedom allocation.

[0082] In one possible embodiment, the special vehicle transmission system performance testing platform under the time-varying vibration environment described above can convert the time-varying vibration environment parameters from the time domain expression form to the frequency domain or time-frequency domain expression form.

[0083] Specifically, when time-varying vibration environment parameters exist in the form of time-history data of vibration acceleration, displacement, or velocity, the special vehicle transmission system performance testing platform under the aforementioned time-varying vibration environment can perform spectrum analysis or time-frequency analysis on the aforementioned time-history data to obtain the distribution characteristics of vibration energy in different frequency ranges.

[0084] Furthermore, this can be further illustrated using the following algorithm for generating time-varying vibration environment spectra:

[0085] in, For time-varying power spectral density, For modulation frequency, The modulation depth. Based on the (static) road power spectrum, This is the frequency band focusing coefficient. The frequency of the time-varying signal, The center (focus) frequency.

[0086] Through spectral conversion, complex time-domain vibration signals can be transformed into frequency-domain representations that are easy to analyze and control, providing a unified target vibration spectrum for the subsequent determination of vibration loading parameters.

[0087] The aforementioned target vibration spectrum can refer to spectral data obtained by spectral conversion of time-varying vibration environment parameters, used to characterize the vibration spectrum characteristics under the target working condition, including but not limited to power spectral density spectrum, frequency band energy distribution spectrum, or time-varying modulated spectral expression, used to reflect the dominant characteristics of vibration in each frequency band and their variation over time.

[0088] In another possible embodiment, the performance testing platform for special vehicle transmission systems under time-varying vibration environments described above can convert the target vibration spectrum into a set of parameters with clear physical meaning that can be directly executed by the testing platform. Specifically, the performance testing platform for special vehicle transmission systems under time-varying vibration environments can parameterize the spectral information according to the energy distribution, dominant frequency, and time-varying characteristics of each frequency band in the target vibration spectrum, thereby mapping the continuous spectral description into discrete control parameters.

[0089] The above loading amplitude refers to the vibration intensity parameter of the test platform when vibration excitation is applied, which is used to characterize the magnitude of vibration in different directions or degrees of freedom; The above-mentioned loading frequency refers to the frequency parameter used when the test platform applies vibration excitation, which is used to characterize the main frequency band or dominant frequency range of the vibration; The aforementioned phase refers to the relative phase relationship between different vibration components or different loading directions, which is used to describe the temporal relationship of vibration under multi-degree-of-freedom or multi-axis loading conditions; The above-mentioned loading duration refers to the length of time that the test platform continuously applies vibration excitation under a certain combination of vibration loading parameters; The aforementioned degree-of-freedom allocation refers to the method of distributing the vibration loading parameters among the multiple loading degrees of freedom provided by the test platform.

[0090] Optionally, the step of performing time-varying vibration tests on the transmission system of the target vehicle based on vibration loading parameters to obtain multi-source test data further includes determining the set of modes to be loaded based on vibration loading parameters; obtaining the modal parameters corresponding to the transmission system to be tested; processing the set of modes and modal parameters based on the modal superposition method to generate a vibration loading signal; applying time-varying vibration excitation to the transmission system to be tested according to the vibration loading signal, and simultaneously acquiring multi-source test data during the application of time-varying vibration excitation.

[0091] In this embodiment of the invention, the aforementioned modal set may refer to a set of target modal parameters selected for participation in vibration synthesis when generating a vibration loading signal. These parameters include modal shape data, natural frequency data, and damping ratio data corresponding to different orders, used to characterize the main dynamic characteristics of the transmission system under test and its installation boundary under vibration.

[0092] The performance testing platform for the transmission system of special vehicles under the aforementioned time-varying vibration environment can select several modes that contribute significantly to the response from the entire mode of the transmission system based on the frequency band range, energy distribution, or dominant frequency characteristics involved in the target vibration loading parameters, thus forming the aforementioned mode set.

[0093] The aforementioned modal parameters can refer to parameter information used to describe the dynamic characteristics of a single mode, including at least one of the mode shape, natural frequency, and damping ratio, wherein: the mode shape is used to describe the spatial deformation characteristics of the structure in that mode; the natural frequency is used to describe the vibration frequency characteristics of that mode; and the damping ratio is used to describe the attenuation characteristics of vibration energy.

[0094] The aforementioned performance testing platform for special vehicle transmission systems under time-varying vibration environments can obtain the modal parameters of the transmission system under test through methods such as experimental modal analysis, simulation calculation, or historical data acquisition.

[0095] In one possible embodiment, the performance testing platform for the transmission system of a special vehicle under time-varying vibration environment described above can combine multiple single modal responses in a certain way based on the modal characteristics of the system to obtain the overall vibration response of the system. Specifically, for each order of modes in the modal set, the corresponding single modal response can be calculated or constructed, and then the single modal responses can be superimposed according to preset weights or phase relationships to generate a vibration response result that can reflect the comprehensive dynamic characteristics of the system.

[0096] Furthermore, the modal superposition method described above can be explained by the following formula:

[0097] in, The signal is a vibration loading signal, and m is the total number of modes considered. For the r-th mode shape, Let the coordinates be the r-th modal coordinates, satisfying:

[0098] in, Let be the first and second derivatives of the r-th modal coordinates. Let r be the natural frequency of the r-th mode. The damping ratio of the r-th mode is... The time-varying excitation force acting on each physical degree of freedom of the system, The excitation force vector The r-th order mode shape The projection on the surface.

[0099] In another possible embodiment, the special vehicle transmission system performance testing platform under the time-varying vibration environment applies a time-varying vibration input to the transmission system under test based on the vibration loading signal. While applying the time-varying vibration excitation, the special vehicle transmission system performance testing platform under the time-varying vibration environment synchronously monitors the transmission system under test and collects multi-source test data, including vibration response data, speed data, torque data, and displacement or attitude data.

[0100] By simultaneously acquiring multi-source test data during the application of vibration excitation, the operating status of the transmission system under the combined action of dynamic vibration environment and dynamic loading can be fully recorded, providing a data foundation for subsequent performance feature extraction and performance evaluation.

[0101] By employing the above-described methods, vibration loading can be transformed from a single-frequency or empirical excitation method into a comprehensive excitation method based on the system's dynamic characteristics. This makes the applied vibration excitation more consistent with the vibration characteristics of the transmission system under actual operating conditions. Compared to traditional simple vibration loading methods, this embodiment can improve the accuracy and stability of vibration reproduction, while reducing computational and control complexity while ensuring test representativeness. This enhances the effectiveness of multi-source test data and the engineering reliability of subsequent performance evaluation results.

[0102] Optionally, the step of extracting performance features from multi-source test data to obtain performance feature parameters may further include preprocessing and time consistency processing of the multi-source test data to obtain aligned data; extracting candidate feature parameters corresponding to each data source based on the aligned data; assigning fusion weights to each data source; and fusing the candidate feature parameters based on a preset feature fusion algorithm to obtain performance feature parameters.

[0103] In this embodiment of the invention, the performance testing platform for the transmission system of special vehicles under time-varying vibration environment can perform basic processing on the original test data before feature extraction of multi-source test data, thereby eliminating noise, outliers or incomplete data introduced during data acquisition, including but not limited to operations such as data filtering, noise reduction, outlier removal, missing data compensation and data smoothing.

[0104] It can also perform time alignment and synchronization correction on multi-source test data from different data sources. By processing time consistency, the time axis of each data source is uniformly corrected so that each data corresponds to the same operating state under the same time base.

[0105] The aforementioned aligned data can refer to a set of data obtained after preprocessing and time consistency processing, in which the sampling time points of each data source have been mapped to a unified time axis, and the data corresponding to the same time point from different data sources can jointly characterize the operating state of the transmission system at that moment.

[0106] The aforementioned candidate feature parameters may refer to the feature set extracted from each data source based on the above alignment data, used to characterize the operating characteristics of the transmission system, including but not limited to at least one of time-domain features, frequency-domain features and / or time-frequency-domain features, such as time-domain statistical features, spectral energy distribution features or time-frequency energy change features, etc.

[0107] In this embodiment, different feature extraction methods can be used from the above-mentioned aligned data for different types of data sources. For example, vibration amplitude, energy or frequency band features can be extracted from vibration response data, and statistical features reflecting operational stability can be extracted from dynamic data.

[0108] The aforementioned fusion weights can refer to the weight parameters assigned to different data sources or different features when fusing candidate feature parameters. These weights can be set based on data reliability, signal-to-noise ratio, operating condition correlation, or empirical rules.

[0109] The aforementioned preset feature fusion algorithm can refer to an algorithm rule or model for fusion calculation of candidate feature parameters. It may include weighted fusion algorithm, evidence fusion algorithm or other feature combination-based fusion algorithm, which is used to integrate candidate feature parameters from different data sources into a unified feature expression.

[0110] More specifically, the weighted fusion can be explained using the following formula:

[0111] in Assign values ​​to the base probabilities after fusion. Let J be the weight coefficient of the j-th data source. For the event, To the proposition The confidence level of the assignment. , where n is the total number of independent data sources participating in the fusion.

[0112] In this embodiment, the candidate feature parameters can be comprehensively calculated based on the above-mentioned fusion weights and preset feature fusion algorithm. Candidate feature parameters from different data sources participate in the calculation according to their corresponding fusion weights, thereby obtaining a fusion feature result that comprehensively reflects the operating performance of the transmission system.

[0113] Optionally, the step of generating a corresponding performance evaluation report based on performance characteristic parameters may further include evaluating the operating performance status of the transmission system under test in a time-varying vibration environment based on the performance characteristic parameters to obtain at least one performance evaluation result; comparing the performance evaluation result with a preset evaluation criterion to determine the state category of the transmission system under test; generating a performance evaluation conclusion based on the state category and forming a performance evaluation report.

[0114] In this embodiment of the invention, the operating performance status of the transmission system under test in a time-varying vibration environment can be analyzed and determined based on the above-mentioned performance characteristic parameters. Specifically, the special vehicle transmission system performance test platform under the above-mentioned time-varying vibration environment can determine whether the current operating status of the transmission system meets the expected performance requirements by analyzing the magnitude, trend or interrelationship of multiple performance characteristic parameters of vibration level, power transmission characteristics and operating stability.

[0115] The aforementioned performance evaluation results may refer to the intermediate results output by the evaluation steps, which reflect the performance of the transmission system under the current test conditions. They may be expressed as numerical results of a single evaluation index or as a combination of multiple evaluation indexes, used to describe the comprehensive performance of the transmission system in terms of efficiency, vibration response, or stability.

[0116] The aforementioned preset evaluation criteria may refer to reference rules or threshold conditions used to determine and classify the above performance evaluation results. They can be set according to design requirements, historical test data, empirical rules or relevant technical standards to clarify the judgment boundaries corresponding to different performance levels.

[0117] The above-mentioned status category can refer to the type of operating status determined by comparing the above performance evaluation results with the preset evaluation criteria, including but not limited to one of the following: normal status, performance degradation status and / or abnormal status.

[0118] The above evaluation conclusions may refer to the final judgment results generated based on the above state categories, which are used to make a comprehensive conclusion description of the operating performance of the transmission system under test under the target working conditions.

[0119] In another possible embodiment, the special vehicle transmission system performance testing platform under time-varying vibration environment described above can also provide early warning of whether the vehicle transmission system is faulty, and its early warning indicators are:

[0120] when When an alert is triggered, among which Here, N is the dynamic threshold, N is the total number of feature parameters, and i is the index. Let be the real-time value of the i-th feature. For dynamic estimation of the characteristic mean, This is a dynamic estimate of the characteristic standard deviation.

[0121] The above dynamic threshold can be calculated using the following formula:

[0122] in, Vibration sensitivity coefficient This represents the historical average of the degradation index. The historical standard deviation of the degradation index. Real-time root mean square value of vibration acceleration.

[0123] When evaluating a transmission system, its lifespan can also be predicted using the following formula:

[0124] in, For dynamic characteristic lifetime, , For static characteristic lifetime, The vibration damage sensitivity coefficient, The "cumulative exposure" to a vibration environment. For reliability function, This is the initial reliability (usually set to 1). For dynamic shape parameters, , These are the initial shape parameters. This represents the shape parameter drift rate.

[0125] The evaluation results can also be quantitatively assessed to determine their accuracy. This can be done using the following formula:

[0126] Where Utotal is the combined standard uncertainty, f is the measurement model function, and xi is the i-th input quantity. This is the sensitivity coefficient. Let be the standard uncertainty of the i-th input quantity. For covariance.

[0127] In another possible embodiment, the performance testing platform for the special vehicle transmission system under time-varying vibration environment described above can also perform adaptive parameter adjustments during testing, specifically through the following formula:

[0128] in, The adjusted test parameters, For real-time evaluation metrics. Basic test parameters, This is the proportional adjustment coefficient. As the target evaluation indicator, This is the differential adjustment coefficient.

[0129] For vehicle data under different operating conditions, the aforementioned special vehicle transmission system performance testing platform under time-varying vibration environment can also use a multi-condition fast switching algorithm, with a switching time of:

[0130] in, These are the operating state vectors before and after the switch, respectively. Operating condition variation norm Reference operating condition norm, Based on the switching time, This allows for the switching of time span coefficients, enabling rapid switching during vehicle data testing under different operating conditions.

[0131] like Figure 2 As shown, this embodiment of the invention also provides a performance testing device 200 for a special vehicle transmission system under time-varying vibration environment. This performance testing device 200 for a special vehicle transmission system under time-varying vibration environment includes: The first acquisition module 201 is used to acquire the time-varying vibration environment parameters of the target vehicle under the target working condition; The first generation module 202 is used to generate corresponding vibration loading parameters based on the time-varying vibration environment parameters; The first test module 203 is used to perform time-varying vibration tests on the transmission system of the target vehicle according to the vibration loading parameters, and obtain multi-source test data. The first extraction module 204 is used to perform performance feature extraction processing on the multi-source test data to obtain performance feature parameters; The second generation module 205 is used to generate a corresponding performance evaluation report based on the performance characteristic parameters.

[0132] Optionally, the above-mentioned device further includes: The first construction module is used to obtain the vehicle system parameters and transmission system parameters of the target vehicle; The second construction module is used to construct coupled dynamic equations based on the vehicle system parameters and transmission system parameters, and to determine the coupling relationship between the vehicle system and the transmission system. The third building module is used to establish a coupled dynamics model based on the coupled dynamics equations and coupling relationships.

[0133] Optionally, the first acquisition module 201 mentioned above includes: The first acquisition submodule is used to acquire road excitation data and / or vehicle response data corresponding to the target working condition through a preset vibration database. The second acquisition submodule is used to determine time-varying vibration environment parameters based on the road surface excitation data and / or vehicle response data. The time-varying vibration environment parameters include vibration acceleration time history data, vibration displacement time history data, vibration velocity time history data, attitude angle change data, power spectral density data, and statistical parameters.

[0134] Optionally, the first generation module 202 mentioned above includes: The first generation submodule is used to perform spectral conversion on the time-varying vibration environment parameters to obtain the target vibration spectrum; The second generation submodule is used to perform parameterized mapping based on the target vibration spectrum to determine the vibration loading parameters, which include loading amplitude, loading frequency, phase, loading duration and degree of freedom allocation.

[0135] Optionally, the first test module 203 mentioned above includes: The first test submodule is used to determine the set of modes to be loaded based on the vibration loading parameters. The set of modes includes mode shape data, natural frequency data and damping ratio data corresponding to different orders. The second test submodule is used to obtain the modal parameters corresponding to the transmission system under test. The modal parameters include at least one of the mode shape, natural frequency and damping ratio. The third test submodule is used to process the mode set and modal parameters based on the modal superposition method to generate a vibration loading signal; The fourth test submodule is used to apply time-varying vibration excitation to the transmission system under test according to the vibration loading signal, and to simultaneously collect multi-source test data during the application of the time-varying vibration excitation.

[0136] Optionally, the first extraction module 204 mentioned above includes: The first extraction submodule is used to preprocess and time consistency process the multi-source test data to obtain aligned data; The second extraction submodule is used to extract candidate feature parameters corresponding to each data source based on the alignment data. The candidate feature parameters include at least one type of time-domain features, frequency-domain features, and / or time-frequency-domain features. The third extraction submodule is used to assign fusion weights to each data source and perform fusion processing on the candidate feature parameters based on a preset feature fusion algorithm to obtain performance feature parameters.

[0137] Optionally, the second generation module 205 mentioned above includes: The third generation submodule is used to evaluate the operating performance status of the transmission system under test in the time-varying vibration environment based on the performance characteristic parameters, and obtain at least one performance evaluation result. The fourth generation submodule is used to compare the performance evaluation results with preset evaluation criteria to determine the state category of the transmission system under test. The state category includes at least one of normal state, performance degradation state and / or abnormal state. The fifth generation submodule is used to generate performance evaluation conclusions based on the state categories and form a performance evaluation report.

[0138] like Figure 3 As shown, this embodiment of the invention also provides an electronic device 300, including a processor, which can execute any of the above-mentioned methods for testing the performance of a special vehicle transmission system under time-varying vibration conditions.

[0139] Specifically, it includes a processor 301 and a memory 302, as well as a computer program stored in the memory 302 and capable of running on the processor 301, which executes a method for testing the performance of a special vehicle transmission system under time-varying vibration conditions, wherein: The processor 301 runs the calculator program stored in memory 302, which describes a method for testing the performance of a special vehicle transmission system under time-varying vibration conditions, and executes the following steps: Obtain time-varying vibration environment parameters of the target vehicle under target operating conditions; Based on the time-varying vibration environment parameters, corresponding vibration loading parameters are generated; Based on the vibration loading parameters, time-varying vibration tests are performed on the transmission system of the target vehicle to obtain multi-source test data. The multi-source test data is subjected to performance feature extraction processing to obtain performance feature parameters; Based on the aforementioned performance characteristic parameters, a corresponding performance evaluation report is generated.

[0140] Optionally, before processor 301 executes the step of acquiring time-varying vibration environmental parameters of the target vehicle under target operating conditions, the method further includes: Obtain the vehicle system parameters and transmission system parameters of the target vehicle; Based on the vehicle system parameters and transmission system parameters, a coupled dynamic equation is constructed, and the coupling relationship between the vehicle system and the transmission system is determined. Based on the aforementioned coupled dynamic equations and coupling relationships, a coupled dynamic model is established.

[0141] Optionally, the processor 301 performs the process of acquiring the time-varying vibration environment parameters of the target vehicle under the target operating conditions, including: By using a pre-set vibration database, road excitation data and / or vehicle response data corresponding to the target working condition are obtained; Based on the road excitation data and / or vehicle response data, time-varying vibration environment parameters are determined. These time-varying vibration environment parameters include vibration acceleration time history data, vibration displacement time history data, vibration velocity time history data, attitude angle change data, power spectral density data, and statistical parameters.

[0142] Optionally, the processor 301 executes the process of generating corresponding vibration loading parameters based on the time-varying vibration environment parameters, including: The time-varying vibration environment parameters are spectrally converted to obtain the target vibration spectrum; Based on the target vibration spectrum, parameterized mapping is performed to determine the vibration loading parameters, which include loading amplitude, loading frequency, phase, loading duration, and degree of freedom allocation.

[0143] Optionally, the processor 301 executes the step of performing a time-varying vibration test on the transmission system of the target vehicle based on the vibration loading parameters to obtain multi-source test data, including: Based on the vibration loading parameters, a set of modes to be loaded is determined, including mode shape data, natural frequency data, and damping ratio data corresponding to different orders; Obtain the modal parameters corresponding to the transmission system under test, wherein the modal parameters include at least one of the mode shape, natural frequency, and damping ratio; The modal set and modal parameters are processed using the modal superposition method to generate a vibration loading signal; A time-varying vibration excitation is applied to the transmission system under test according to the vibration loading signal, and multi-source test data are collected simultaneously during the application of the time-varying vibration excitation.

[0144] Optionally, the processor 301 performs the performance feature extraction processing on the multi-source test data to obtain performance feature parameters, including: The multi-source test data is preprocessed and time consistency processed to obtain aligned data; Based on the alignment data, candidate feature parameters corresponding to each data source are extracted respectively. The candidate feature parameters include at least one type of time-domain features, frequency-domain features, and / or time-frequency-domain features. Assign fusion weights to each data source, and perform fusion processing on the candidate feature parameters based on a preset feature fusion algorithm to obtain performance feature parameters.

[0145] Optionally, the processor 301 executes the process of generating a corresponding performance evaluation report based on the performance characteristic parameters, including: Based on the aforementioned performance characteristic parameters, the operating performance status of the transmission system under test is evaluated under the time-varying vibration environment, and at least one performance evaluation result is obtained. The performance evaluation results are compared with preset evaluation criteria to determine the state category of the transmission system under test. The state category includes at least one of normal state, performance degradation state and / or abnormal state. Based on the stated state category, a performance evaluation conclusion is generated, and a performance evaluation report is formed.

[0146] This invention also provides a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the various processes of the special vehicle transmission system performance testing method under time-varying vibration environment or the application-side time-varying vibration environment provided in this invention, and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0147] Those skilled in the art will understand that implementing all or part of the processes in the above embodiments can be done by a computer program instructing related hardware, and can be stored in a computer-readable storage medium. When executed, the program can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0148] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for testing the performance of a special vehicle transmission system under time-varying vibration conditions, characterized in that, include: Obtain time-varying vibration environment parameters of the target vehicle under target operating conditions; Based on the time-varying vibration environment parameters, corresponding vibration loading parameters are generated; Based on the vibration loading parameters, time-varying vibration tests are performed on the transmission system of the target vehicle to obtain multi-source test data. The multi-source test data is subjected to performance feature extraction processing to obtain performance feature parameters; Based on the aforementioned performance characteristic parameters, a corresponding performance evaluation report is generated.

2. The method for testing the performance of a special vehicle transmission system under time-varying vibration environment as described in claim 1, characterized in that, Before obtaining the time-varying vibration environment parameters of the target vehicle under the target operating condition, the method further includes: Obtain the vehicle system parameters and transmission system parameters of the target vehicle; Based on the vehicle system parameters and transmission system parameters, a coupled dynamic equation is constructed, and the coupling relationship between the vehicle system and the transmission system is determined. Based on the aforementioned coupled dynamic equations and coupling relationships, a coupled dynamic model is established.

3. The method for testing the performance of a special vehicle transmission system under time-varying vibration environment as described in claim 1, characterized in that, The acquisition of time-varying vibration environment parameters of the target vehicle under target operating conditions includes: By using a pre-set vibration database, road excitation data and / or vehicle response data corresponding to the target working condition are obtained; Based on the road excitation data and / or vehicle response data, time-varying vibration environment parameters are determined. These time-varying vibration environment parameters include vibration acceleration time history data, vibration displacement time history data, vibration velocity time history data, attitude angle change data, power spectral density data, and statistical parameters.

4. The method for testing the performance of a special vehicle transmission system under time-varying vibration environment as described in claim 1, characterized in that, The generation of corresponding vibration loading parameters based on the time-varying vibration environment parameters includes: The time-varying vibration environment parameters are spectrally converted to obtain the target vibration spectrum; Based on the target vibration spectrum, parameterized mapping is performed to determine the vibration loading parameters, which include loading amplitude, loading frequency, phase, loading duration, and degree of freedom allocation.

5. The method for testing the performance of a special vehicle transmission system under time-varying vibration environment as described in claim 1, characterized in that, The step involves performing time-varying vibration tests on the transmission system of the target vehicle based on the vibration loading parameters to obtain multi-source test data, including: Based on the vibration loading parameters, a set of modes to be loaded is determined, including mode shape data, natural frequency data, and damping ratio data corresponding to different orders; Obtain the modal parameters corresponding to the transmission system under test, wherein the modal parameters include at least one of the mode shape, natural frequency, and damping ratio; The modal set and modal parameters are processed using the modal superposition method to generate a vibration loading signal; A time-varying vibration excitation is applied to the transmission system under test according to the vibration loading signal, and multi-source test data are collected simultaneously during the application of the time-varying vibration excitation.

6. The method for testing the performance of a special vehicle transmission system under time-varying vibration environment as described in claim 1, characterized in that, The process of extracting performance features from the multi-source test data to obtain performance feature parameters includes: The multi-source test data is preprocessed and time consistency processed to obtain aligned data; Based on the alignment data, candidate feature parameters corresponding to each data source are extracted respectively. The candidate feature parameters include at least one type of time-domain features, frequency-domain features, and / or time-frequency-domain features. Assign fusion weights to each data source, and perform fusion processing on the candidate feature parameters based on a preset feature fusion algorithm to obtain performance feature parameters.

7. The method for testing the performance of a special vehicle transmission system under time-varying vibration environment as described in claim 1, characterized in that, The step of generating a corresponding performance evaluation report based on the performance characteristic parameters includes: Based on the aforementioned performance characteristic parameters, the operating performance status of the transmission system under test is evaluated under the time-varying vibration environment, and at least one performance evaluation result is obtained. The performance evaluation results are compared with preset evaluation criteria to determine the state category of the transmission system under test. The state category includes at least one of normal state, performance degradation state and / or abnormal state. Based on the stated state category, a performance evaluation conclusion is generated, and a performance evaluation report is formed.

8. A performance testing device for a special vehicle transmission system under time-varying vibration environment, characterized in that, include: The first acquisition module is used to acquire the time-varying vibration environment parameters of the target vehicle under the target working conditions; The first generation module is used to generate corresponding vibration loading parameters based on the time-varying vibration environment parameters; The first test module is used to perform time-varying vibration tests on the transmission system of the target vehicle according to the vibration loading parameters, and obtain multi-source test data. The first extraction module is used to perform performance feature extraction processing on the multi-source test data to obtain performance feature parameters; The second generation module is used to generate a corresponding performance evaluation report based on the performance characteristic parameters.

9. An electronic device, characterized in that, include: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps in the method for testing the performance of a special vehicle transmission system under time-varying vibration conditions as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps in the method for testing the performance of a special vehicle transmission system under time-varying vibration environment as described in any one of claims 1 to 7.

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