A method for simulating road vibration detection of an automotive interior system

Abstract

This invention discloses a method for simulating road vibration testing of an automotive interior system, comprising: placing a vehicle equipped with the device under test in a test preparation state, confirming that the vehicle is in good condition and its configuration meets the requirements; collecting road excitation signals when the vehicle is driving on a preset test road to obtain road spectrum data; inputting the road spectrum data into a six-axis vibration test bench for simulation playback iteration to obtain a load spectrum that meets a preset accuracy with the actual road excitation; installing and fixing the device under test on the six-axis vibration test bench and arranging measurement sensors; using the load spectrum to drive the six-axis vibration test bench to perform vibration testing on the device under test according to a preset duration or number of cycles; performing intermittent state checks on the device under test during the vibration test, and performing final functional confirmation on the device under test after the vibration test is completed.

Description

Technical Field

[0001] This invention relates to the field of automotive engineering testing technology, and in particular to a method for simulating road vibration detection of automotive interior systems. Background Technology

[0002] As automotive interior components become increasingly personalized, structurally complex, and equipped with a wider range of intelligent features, the structural stability and functional reliability of interior systems under vibration conditions face greater challenges. During the vehicle development phase, employing appropriate testing methods to conduct vibration verification of interior components and proactively identify and eliminate potential problems is a crucial step in ensuring the stability and reliability of the interior system.

[0003] Currently, vibration testing of vehicle interior components typically employs a triaxial vibration table to simulate vibration in one direction. The vibration excitation methods include fixed frequency, frequency sweep, or random vibration (see GB / T 2423.59-2008 and GB / T 2423.102-2008). These methods can only apply vibration excitation to one direction (X, Y, or Z) at a time. For example, during a fixed-frequency vibration test in the X direction, the tested component or system is not subjected to any vibration excitation in the Y and Z directions and remains in a free state.

[0004] However, during actual vehicle operation, the road exerts multi-directional composite vibration excitation on the vehicle and interior components. The existing method of testing in one direction sequentially cannot simulate the multi-directional composite vibration conditions of actual roads, and the vibration excitation scenario is relatively simple, making it difficult to cover the multiple overlapping scenarios in actual user use.

[0005] Therefore, there is an urgent need for a vibration detection method for automotive interior systems that can simulate multi-directional composite vibration excitation on actual roads, in order to solve the technical problem that unidirectional vibration testing in existing technologies cannot simulate the composite vibration conditions on actual roads. Summary of the Invention

[0006] The main objective of this invention is to provide a method for simulating road vibration detection in automotive interior systems.

[0007] Another objective of this invention is to provide a device for simulating road vibration detection in automotive interior systems.

[0008] The third objective of this invention is to provide a computer device.

[0009] A fourth objective of this invention is to provide a non-transitory computer-readable storage medium.

[0010] To achieve the above objectives, a first aspect of the present invention provides a method for simulating road vibration detection of an automotive interior system, comprising: Place the vehicle equipped with the device under test in the test preparation state and confirm that the vehicle is in good condition and the configuration meets the requirements. Road excitation signals are collected when the vehicle is traveling on a preset test road to obtain road spectrum data; The road spectrum data is input into a six-axis vibration test bench for simulation playback and iteration to obtain a load spectrum that meets the preset accuracy with the actual road excitation. The device under test is mounted and fixed on the six-axis vibration test bench, and measuring sensors are arranged there. The load spectrum is used to drive the six-axis vibration test bench to perform vibration tests on the device under test according to a preset duration or number of cycles. During vibration testing, the device under test is periodically checked for condition, and after the vibration test is completed, the device under test is finally functionally confirmed.

[0011] In one embodiment of the present invention, the step of collecting road excitation signals when the vehicle is traveling on a preset test road includes: Road spectrum acquisition sensors are placed at various fixed points on the device under test and the vehicle body, at the geometric center of the device under test, and at the farthest point. Based on preset vehicle speed and load conditions, multiple data collections are performed under the same working condition. The set of data with the best stability is selected as the road spectrum data through frequency domain transfer function calculation.

[0012] In one embodiment of the present invention, the step of inputting the road spectrum data into a six-axis vibration test bench for simulation playback iteration includes: The device under test or the vehicle interior system for data collection is mounted on the six-axis vibration test bench using tooling or vehicle body fixing methods. Prioritize iteration using the fixed point and center point channels of the device under test. When there is a conflict between the fixed point and center point iterations, the fixed point location takes priority. The iteration accuracy is not lower than a preset threshold, wherein the root mean square error and damage error of the system-level channel are both less than the preset value.

[0013] In one embodiment of the present invention, the step of using the load spectrum to drive the six-axis vibration test bench to perform vibration testing on the device under test according to a preset duration or number of cycles includes: The number of cycles is determined by the ratio of the target spurious damage over the entire life cycle of the device under test to the damage of a single load spectrum, and this ratio is used as the duration of the vibration test. The load spectrum is used to drive the six-axis vibration test bench to perform vibration tests on the device under test, and noise signals are collected simultaneously during the test.

[0014] In one embodiment of the present invention, a noise analysis step is also included: The interface internal forces of each connection interface of the device under test are solved by decoupling through the multi-input multi-output frequency response function matrix, and the device under test is divided into multiple substructures according to the preset splitting conditions. Sensors are placed at the connection points of each substructure, and the interface forces of each degree of freedom are measured by road spectrum playback, thereby identifying the components that generate abnormal noise.

[0015] To achieve the above objectives, a second aspect of the present invention provides a vehicle interior system simulated road vibration detection device, comprising: A six-axis vibration test bench is used to generate multi-degree-of-freedom random vibration excitation based on the input road load spectrum. The sensor assembly includes accelerometers arranged at the fixed point, center position and farthest position of the device under test, for collecting vibration signals; A sound level meter is used to collect noise signals during vibration testing. The control and analysis unit is electrically connected to the six-axis vibration test bench, the sensor assembly, and the sound level meter. It is used to control the vibration test process, collect test data, and determine the source of abnormal noise through multi-input multi-output frequency response function decoupling analysis.

[0016] To achieve the above objectives, a third aspect of this application provides a computer device, including a processor and a memory; wherein the processor runs a program corresponding to the executable program code by reading executable program code stored in the memory, for implementing a method for simulating road vibration detection of an automotive interior system as described in the first aspect embodiment.

[0017] To achieve the above objectives, a fourth aspect of this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for simulating road vibration detection of an automotive interior system as described in the first aspect embodiment.

[0018] The embodiments of the present invention have the following beneficial effects: The method provided in this application collects real road spectrum data of vehicles on preset test roads and performs simulated playback on a six-axis vibration test bench. This allows the device under test to experience multi-degree-of-freedom composite vibration excitation equivalent to actual vehicle road driving in the vehicle's installed state, rather than simple vibration in only one direction. This solves the technical problem that existing single-direction vibration tests cannot simulate the multi-directional composite vibration conditions of actual roads. It achieves a realistic simulation of the vibration response of automotive interior systems under actual road excitation, providing a more realistic test basis for the structural optimization and reliability verification of interior devices. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 A flowchart of a method for simulating road vibration detection of an automotive interior system provided in an embodiment of the present invention; Figure 2 This is a structural diagram of a vehicle interior system simulated road vibration detection device provided in an embodiment of the present invention. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0022] To address the problem that existing vibration testing methods cannot realistically simulate actual road excitation conditions and scenarios, this application provides a method for simulating road vibration detection in automotive interior systems. This method, based on actual user scenarios, simulates real road excitation conditions by collecting and iteratively replaying real road excitation signals. By clearly defining the methods and requirements for each stage of the testing process, it achieves testing and verification that matches subsequent vehicle verification and conforms to actual user scenarios, thereby effectively improving the authenticity and validity of the verification results.

[0023] The following describes a method for simulating road vibration detection of an automotive interior system according to an embodiment of the present invention, with reference to the accompanying drawings.

[0024] Example 1 This embodiment provides a method for simulating road vibration detection in automotive interior systems, such as... Figure 1 As shown, the method includes the following steps: S1, Place the vehicle equipped with the device under test in the test preparation state and confirm that the vehicle is in good condition and the configuration meets the requirements.

[0025] S2, collect the road excitation signal when the vehicle is driving on the preset test road to obtain road spectrum data.

[0026] S3, input the road spectrum data into a six-axis vibration test bench for simulation playback iteration to obtain a load spectrum that meets the preset accuracy with the actual road excitation.

[0027] S4, the device under test is installed and fixed on the six-axis vibration test bench, and the measuring sensors are arranged.

[0028] S5. The load spectrum is used to drive the six-axis vibration test bench to perform vibration testing on the device under test according to a preset duration or number of cycles.

[0029] S6. During the vibration test, the device under test is periodically checked for condition, and after the vibration test is completed, the device under test is finally functionally confirmed.

[0030] The specific implementation of each step in this embodiment will be described in detail below with reference to the accompanying drawings.

[0031] Specifically, step S1 includes: Before conducting vibration testing, it is essential to confirm that the vehicle carrying the device under test is in good condition and that the device is a fixed component of the vehicle. In other words, the device or system to be verified must be a fixed configuration and used on this vehicle; splicing methods are not permitted. Simultaneously, the vehicle's load parameters, including unloaded and fully loaded mass, must be clearly defined, and the actual parameters of the vehicle under unloaded conditions must be measured to ensure accurate matching of vehicle load conditions during subsequent road spectrum data acquisition.

[0032] Specifically, step S2 includes: During the road spectrum acquisition phase, road spectrum acquisition sensors are first deployed at various fixed points on the device under test and the vehicle body, at the geometric center of the device under test, and at its farthest point. If the device under test has an irregular shape, its center position can be selected at two or three evenly distributed points on the horizontal line of the center position, not exceeding three points.

[0033] The data collection scenario should be a representative test site or an actual road section open to the market. Data collection should be conducted according to preset vehicle speed and load conditions, which should be defined based on user operating conditions or established test methods. The number of data collections for the same operating condition should be no less than 5 times, and the coherence function values ​​of each collection should be calculated using the complete complex transfer function in the frequency domain measured PSD method.

[0034] in and Let be the automatic rate spectral density functions of the input and output signals, respectively. Let be the interaction rate spectral density function of the input and output signals. When When the value approaches 1 and is at its maximum, select this set of data as the road spectrum data for this working condition.

[0035] Specifically, step S3 includes: The vehicle-mounted data acquisition device is mounted on a six-axis vibration test bench by either fabricating a fixture or directly cutting and fixing it to the vehicle body. If the fixture matching method is adopted, the fixture needs to be measured by a coordinate measuring machine (CMM), and its maximum deviation from the coordinate values ​​of the actual vehicle should not exceed 2mm.

[0036] The six-axis vibration test bench can realize random vibration excitation of 6 degrees of freedom. The table size is square with a minimum of 2m×2m or circular with a minimum diameter of 2m. The maximum load on the table is not less than 1000kg. The no-load frequency is not less than 120Hz, the full-load frequency is not less than 90Hz, the full-load acceleration is not less than 100m / s² in the X direction, not less than 100m / s² in the Y direction, and not less than 100m / s² in the Z direction, and the full-load displacement is not less than ±125mm in the X direction, not less than ±110mm in the Y direction, and not less than ±140mm in the Z direction.

[0037] During the iteration process, priority is given to iterating on the fixed point and center point channel of the device under test. If there are more than two center point channels, the point closest to the geometric center is selected; if there is a conflict between the fixed point and the center point iteration, the fixed point position is given priority; if there is a conflict between multiple fixed point iterations, the fixed point closer to the centroid position is given priority.

[0038] Regarding iteration accuracy, for system-level iterations with ≥3 channels, the RMSE (root mean square error) of all channels is <5%, and the damage error is between 1.2 and 2 times; for component-level iterations with ≤2 channels, the RMSE (root mean square error) of all channels is <3%, and the damage error is between 1.0 and 1.8 times.

[0039] Specifically, step S4 includes: After completing the road spectrum iteration, the device used for iteration is removed, and the device under test (DUT) to be verified is assembled. Identical measurement sensors are placed on the DUT according to the sensor positions determined during the data acquisition phase.

[0040] The device under test was assembled using only real vehicle parts, including bolts and washers, and the torque of the fixing bolts strictly followed the vehicle assembly process requirements. After assembly, the device under test underwent functional testing, operational load and angle confirmation, and manual shaking checks to confirm the absence of abnormal noises or looseness. The fit clearances were measured, and the measurement points were marked. A sound level meter was placed at a simulated ear distance, based on the normal seating position of a passenger or driver in a real vehicle, to measure noise. For shared systems or devices, the meter was placed at the ear distance closest to the occupant.

[0041] Specifically, step S5 includes: The number of test cycles is determined based on the ratio of spurious damage to single-load spectrum damage throughout the entire lifecycle of the device under test. The calculation formula is:

[0042] in The overall goal of the entire life cycle is pseudo-damage. This involves single-cycle load spectrum damage. A six-axis vibration test bench is driven using an iterated load spectrum that meets accuracy requirements, and the device under test is subjected to vibration testing according to a predetermined number of cycles. If the six-axis vibration test bench is matched with an environmental simulation device, environmental conditions such as illumination, temperature, and humidity can be appropriately increased to better match actual user scenarios.

[0043] During the vibration test, the setup process of the device under test was checked and measured at five equal intervals, as described in step S4, to confirm the status and stability of the system or device. Simultaneously, noise signals were collected throughout the test, and at the initial stage, personnel were on-site to subjectively evaluate any abnormal noises.

[0044] Specifically, step S6 includes: After the vibration test is completed, a final functional check and status confirmation are performed. This final check consists of two parts: the first is conducted immediately after the vibration test, and the second is conducted 12 hours later. The check includes verifying the normal functioning of the device under test, changes in fit clearances, any looseness, and any abnormal noises. If any abnormal noises or other issues are found, the system will be dismantled and the test bench restored after the cause has been identified, and the test bench is deemed unnecessary.

[0045] In addition, this embodiment also includes a noise analysis step. Regardless of whether the noise analysis is performed at the complex system or component level, a multi-component coupled vibration transmission path analysis method is adopted. The main steps are as follows: First, the interfacial forces at each connection interface are solved by decoupling using a multi-input multi-output frequency response function matrix. Then, the device under test is disassembled into multiple substructures. The disassembly principle is as follows: welded or bolted connections are used as substructure boundaries, or the distance between the centroid of a sub-component and the system centroid is greater than 30% of the maximum distance between the system or component and the fixed point of the vibration test bench; in this case, the sub-component is considered an independent substructure for analysis. Sensors, such as triaxial accelerometers, are placed at the connection points of each substructure. The interfacial forces of each degree of freedom under operating conditions are directly measured using path spectrum playback. Finally, coupled modal analysis and path contribution analysis are used to identify the components generating abnormal noise. These components are then improved to reduce or avoid vibration contribution, thereby eliminating or weakening the abnormal noise. After improvement, the device is reassembled and tested using the same path spectrum for acceptance verification.

[0046] The following uses the vibration test of the driver's seat device as an example to illustrate the specific application of this embodiment.

[0047] First, determine the vehicle to be matched with the test seat system, prepare the vehicle, and clarify parameters such as the vehicle's unloaded weight and fully loaded weight. Place road spectrum acquisition sensors at fixed points on the seat, and also place them at the center of the seat back and the headrest. Select a data collection condition, such as a cobblestone road surface at the test track, and collect road spectrum data at a speed of 60 km / h under full load. Collect data five times under this condition, and select the two sets of data with the best stability as the road spectrum data.

[0048] Remove the seats from the vehicle and create a simulation fixture or directly cut and fix the body-in-white to the seats. Secure the removed seats, ensuring that the channels and fixing points for collecting road spectra are not damaged during the process. Following the above iteration requirements, iterate to obtain a load spectrum with an accuracy of no less than 85%. Remove the seats used for iteration and replace them with seats used for testing. Simultaneously, arrange sensors and sound level meters according to the sensor locations for data collection or iteration. Check the functionality of the seats and evaluate any abnormal noises.

[0049] Conduct a road spectrum playback vibration test according to the number of cycles determined by the damage requirements, and check, confirm, and record the results according to the verification and inspection requirements during the process. After the test, dismantle the device and restore the site and testing equipment.

[0050] Using the methods described above, this embodiment verifies the vibration performance of automotive interior systems under actual road conditions. It can realistically simulate user scenarios, effectively identify the source of abnormal noise and guide improvements, providing a complete test scheme for the reliability verification of automotive interior systems.

[0051] Example 2 This invention also provides a device for simulating road vibration detection in automotive interior systems, such as... Figure 2 As shown, the device 10 includes: The six-axis vibration test bench 100 is used to generate multi-degree-of-freedom random vibration excitation based on the input road load spectrum. The sensor assembly 200 includes an accelerometer arranged at a fixed point, a center position, and a farthest position of the device under test, for collecting vibration signals; The sound level meter 300 is used to collect noise signals during vibration testing. The control and analysis unit 400 is electrically connected to the six-axis vibration test bench, the sensor assembly, and the sound level meter. It is used to control the vibration test process, collect test data, and determine the source of abnormal noise through multi-input multi-output frequency response function decoupling analysis.

[0052] Example 3 To implement the methods of the above embodiments, the present invention also provides a computer device, which includes a memory and a processor; wherein the processor runs a program corresponding to the executable program code by reading executable program code stored in the memory, so as to implement the various steps of the methods described above.

[0053] Example 4 To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the method described in the foregoing embodiments.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A method for simulating road vibration detection in automotive interior systems, characterized in that, Includes the following steps: Place the vehicle equipped with the device under test in the test preparation state and confirm that the vehicle is in good condition and the configuration meets the requirements. Road excitation signals are collected when the vehicle is traveling on a preset test road to obtain road spectrum data; The road spectrum data is input into a six-axis vibration test bench for simulation playback and iteration to obtain a load spectrum that meets the preset accuracy with the actual road excitation. The device under test is mounted and fixed on the six-axis vibration test bench, and measuring sensors are arranged there. The load spectrum is used to drive the six-axis vibration test bench to perform vibration tests on the device under test according to a preset duration or number of cycles. During vibration testing, the device under test is periodically checked for condition, and after the vibration test is completed, the device under test is finally functionally confirmed.

2. The method according to claim 1, characterized in that, The process of collecting road excitation signals when the vehicle is traveling on a preset test road includes: Road spectrum acquisition sensors are placed at various fixed points on the device under test and the vehicle body, at the geometric center of the device under test, and at the farthest point. Based on preset vehicle speed and load conditions, multiple data collections are performed under the same working condition. The set of data with the best stability is selected as the road spectrum data through frequency domain transfer function calculation.

3. The method according to claim 1, characterized in that, The step of inputting the road spectrum data into a six-axis vibration test bench for simulation playback iteration includes: The device under test or the vehicle interior system for data collection is mounted on the six-axis vibration test bench using tooling or vehicle body fixing methods. Prioritize iteration using the fixed point and center point channels of the device under test. When there is a conflict between the fixed point and center point iterations, the fixed point location takes priority. The iteration accuracy is not lower than a preset threshold, wherein the root mean square error and damage error of the system-level channel are both less than the preset value.

4. The method according to claim 1, characterized in that, The process of using the load spectrum to drive the six-axis vibration test bench to perform vibration testing on the device under test according to a preset duration or number of cycles includes: The number of cycles is determined by the ratio of the target spurious damage over the entire life cycle of the device under test to the damage of a single load spectrum, and this ratio is used as the duration of the vibration test. The load spectrum is used to drive the six-axis vibration test bench to perform vibration tests on the device under test, and noise signals are collected simultaneously during the test.

5. The method according to claim 4, characterized in that, It also includes a noise analysis step: The interface internal forces of each connection interface of the device under test are solved by decoupling through the multi-input multi-output frequency response function matrix, and the device under test is divided into multiple substructures according to the preset splitting conditions. Sensors are placed at the connection points of each substructure, and the interface forces of each degree of freedom are measured by road spectrum playback, thereby identifying the components that generate abnormal noise.

6. A vehicle interior system simulated road vibration detection device, used to implement the method as described in any one of claims 1-5, characterized in that, include: A six-axis vibration test bench is used to generate multi-degree-of-freedom random vibration excitation based on the input road load spectrum. The sensor assembly includes accelerometers arranged at the fixed point, center position and farthest position of the device under test, for collecting vibration signals; A sound level meter is used to collect noise signals during vibration testing. The control and analysis unit is electrically connected to the six-axis vibration test bench, the sensor assembly, and the sound level meter. It is used to control the vibration test process, collect test data, and determine the source of abnormal noise through multi-input multi-output frequency response function decoupling analysis.

7. A computer device, characterized in that, Including processor and memory; The processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement a method for simulating road vibration detection of an automotive interior system as described in any one of claims 1-5.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements a method for simulating road vibration detection of an automotive interior system as described in any one of claims 1-5.

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