Nvh test method, device and equipment for vehicle drive axle

Abstract

The application provides an NVH test method, device and equipment for a vehicle drive axle. The method comprises the following steps: arranging vibration acceleration sensors and sound sensors at preset positions of the vehicle drive axle, wherein the preset positions comprise positions on the vehicle drive axle and positions around the vehicle drive axle; acquiring background noise of a test bench through the sound sensors; acquiring a preset test strategy of the vehicle drive axle; controlling a load dynamometer and a drive dynamometer according to the preset test strategy, so as to acquire vibration information and sound information of the vehicle drive axle through the vibration acceleration sensors and the sound sensors respectively; calculating a noise difference value between the sound information and the background noise; and in response to the noise difference value meeting a preset test effective condition, generating an NVH test result of the vehicle drive axle according to the preset test strategy, the vibration information and the sound information. Thus, the NVH result of the drive axle can be accurately collected, and data support for improving the comfort of the whole vehicle is provided.

Description

Technical Field

[0001] This application relates to the field of NVH testing technology, and in particular to an NVH testing method, apparatus and equipment for a vehicle drive axle. Background Technology

[0002] In automotive drivetrain systems, the drive axle is a key component for power transmission. Its NVH (Noise, Vibration, and Harshness) performance directly affects the overall vehicle's ride comfort and operational quality. However, due to factors such as structural design and operating load, the drive axle is prone to significant vibration and noise issues, making it a key focus of vehicle NVH control. Currently, the industry lacks standardized testing methods for drive axles' vibration and noise. Existing practices often directly apply vibration and noise testing methods used for ordinary components to drive axles, failing to adapt to their structural characteristics and vibration and noise transmission patterns. This approach only allows for testing of finished products in the later stages of development, failing to provide clear testing standards and optimization criteria in the early development phase. This not only increases the technical difficulty and time cost of later rectification but also hinders the systematic improvement of drive axle NVH performance. Summary of the Invention

[0003] This application aims to at least partially address one of the technical problems in the related art.

[0004] Therefore, the first objective of this application is to propose an NVH testing method for vehicle drive axles, which can accurately obtain vibration and sound data of drive axles through bench testing, and generate NVH results by combining testing strategies, providing professional data support for improving the overall vehicle comfort.

[0005] The second objective of this application is to provide an NVH testing device for a vehicle drive axle.

[0006] The third objective of this application is to propose an electronic device.

[0007] To achieve the above objectives, a first aspect of this application proposes an NVH testing method for a vehicle drive axle. The vehicle drive axle is mounted on a test bench, which includes a load dynamometer and a drive dynamometer. The method includes the following steps: arranging a vibration acceleration sensor and a sound sensor at preset positions on the vehicle drive axle, wherein the preset positions include positions on the vehicle drive axle and positions around the vehicle drive axle; acquiring the background noise of the test bench through the sound sensor; acquiring a preset test strategy for the vehicle drive axle; controlling the load dynamometer and the drive dynamometer according to the preset test strategy to acquire vibration information and sound information of the vehicle drive axle through the vibration acceleration sensor and the sound sensor, respectively; calculating the noise difference between the sound information and the background noise; and generating NVH test results for the vehicle drive axle based on the preset test strategy, the vibration information, and the sound information, in response to the noise difference satisfying preset test validity conditions.

[0008] The NVH testing method for a vehicle drive axle according to an embodiment of this application firstly arranges vibration acceleration sensors and sound sensors at preset positions on the vehicle drive axle, including positions on the vehicle drive axle and positions around the vehicle drive axle. Then, the background noise of the test bench is acquired through the sound sensor, followed by the acquisition of a preset test strategy for the vehicle drive axle. Next, the load dynamometer and drive dynamometer are controlled according to the preset test strategy to acquire vibration and sound information of the vehicle drive axle through the vibration acceleration sensors and sound sensors, respectively. The noise difference between the sound information and the background noise is then calculated. Finally, in response to the noise difference satisfying preset test validity conditions, the NVH test results of the vehicle drive axle are generated based on the preset test strategy, vibration information, and sound information. Therefore, the vibration and sound data of the drive axle can be accurately acquired through bench testing, and NVH results can be generated in combination with the test strategy, providing professional data support for improving overall vehicle comfort.

[0009] In addition, the NVH testing method for the vehicle drive axle according to the above embodiments of this application may also have the following additional technical features:

[0010] In one embodiment of this application, the test bench further includes an input drive shaft, an output drive shaft, and a support frame. The vehicle drive axle is mounted on the support frame, the input end of the vehicle drive axle is connected to the main shaft of the drive dynamometer via the input drive shaft, and the output end of the vehicle drive axle is connected to the load dynamometer via the output drive shaft.

[0011] In one embodiment of this application, the output end of the vehicle drive axle includes a first output end and a second output end of the vehicle drive axle, the load dynamometer includes a first load dynamometer and a second load dynamometer, and the output drive shaft includes a first output drive shaft and a second output drive shaft. The first output end of the vehicle drive axle is connected to the first load dynamometer through the first output drive shaft, and the second output end of the vehicle drive axle is connected to the second load dynamometer through the second output drive shaft.

[0012] In one embodiment of this application, the test bench further includes an anechoic chamber, in which the vehicle drive axle, drive dynamometer, input drive shaft, output drive shaft, and support frame are all disposed. The load dynamometer is disposed outside the anechoic chamber and is connected to the output drive shaft via a through-wall shaft and an intermediate support.

[0013] In one embodiment of this application, vibration acceleration sensors are respectively disposed at the input end and the output end of the vehicle drive axle, and a sound sensor is disposed directly above the vehicle drive axle, with the vertical distance between the position of the sound sensor and the housing of the vehicle drive axle being a target preset distance.

[0014] In one embodiment of this application, obtaining the background noise of the test bench through a sound sensor includes: disconnecting the connection between the main shaft of the driving dynamometer and the input drive shaft; controlling the driving dynamometer to run unloaded according to a preset background noise test strategy, so as to obtain the background noise of the test bench through the sound sensor.

[0015] In one embodiment of this application, if the noise difference is greater than or equal to a first preset noise threshold, it is determined that the noise difference meets the preset test validity conditions; if the noise difference is less than the first preset noise threshold, it is determined that the noise difference does not meet the preset test validity conditions.

[0016] In one embodiment of this application, before generating the NVH test results of the vehicle drive axle based on the preset test strategy, vibration information, and sound information, the method further includes: in response to the noise difference meeting the preset test validity conditions, determining whether the noise difference is less than or equal to a second preset noise threshold, wherein the second preset noise threshold is greater than a first preset noise threshold; if the noise difference is less than or equal to the second preset noise threshold, obtaining a sound difference correction table, and correcting the sound information based on the sound difference correction table and the noise difference.

[0017] To achieve the above objectives, a second aspect of this application provides an NVH testing device for a vehicle drive axle. The vehicle drive axle is mounted on a test bench, which includes a load dynamometer and a drive dynamometer. The device includes: an arrangement module for arranging a vibration acceleration sensor and a sound sensor at preset positions on the vehicle drive axle, wherein the preset positions include positions on the vehicle drive axle and positions around the vehicle drive axle; a first acquisition module for acquiring background noise of the test bench through the sound sensor; a second acquisition module for acquiring a preset test strategy for the vehicle drive axle; a control module for controlling the load dynamometer and the drive dynamometer according to the preset test strategy to acquire vibration information and sound information of the vehicle drive axle through the vibration acceleration sensor and the sound sensor, respectively; a calculation module for calculating the noise difference between the sound information and the background noise; and a generation module for generating NVH test results for the vehicle drive axle based on the preset test strategy, vibration information, and sound information, in response to the noise difference meeting preset test validity conditions.

[0018] The NVH testing device for a vehicle drive axle according to an embodiment of this application firstly arranges vibration acceleration sensors and sound sensors at preset positions on the vehicle drive axle using an arrangement module. These preset positions include locations on the vehicle drive axle and locations around the vehicle drive axle. Then, a first acquisition module acquires the background noise of the test bench through the sound sensor. Next, a second acquisition module acquires a preset test strategy for the vehicle drive axle. Following this, a control module controls a load dynamometer and a drive dynamometer according to the preset test strategy to acquire vibration and sound information from the vehicle drive axle through the vibration acceleration sensor and sound sensor, respectively. Then, a calculation module calculates the noise difference between the sound information and the background noise. Finally, a generation module generates NVH test results for the vehicle drive axle based on the preset test strategy, vibration information, and sound information, in response to the noise difference meeting preset test validity conditions. Thus, it can accurately acquire vibration and sound data of the drive axle through bench testing, and generate NVH results in conjunction with the test strategy, providing professional data support for improving overall vehicle comfort.

[0019] To achieve the above objectives, a third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements any of the above-described NVH testing methods for a vehicle drive axle.

[0020] The electronic device according to the embodiments of this application implements any of the above-mentioned NVH testing methods for vehicle drive axles when the processor executes a computer program. It achieves accurate acquisition of vibration and sound data of the drive axle through bench testing, and generates NVH results in combination with the testing strategy, providing professional data support for improving the comfort of the whole vehicle.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart illustrating a method for testing the NVH (Noise, Vibration, and Harshness) of a vehicle drive axle according to some embodiments of this application. Figure 2 This is a schematic diagram of the drive bridge installation according to some embodiments of this application; Figure 3 This is a schematic diagram of drive axle noise and vibration measurement points according to some embodiments of this application; Figure 4 This is a flowchart illustrating an NVH testing method for a vehicle drive axle according to a specific embodiment of this application. Figure 5 This is a diagram showing the vibration test results of a vehicle drive axle according to a specific embodiment of this application; Figure 6 A block diagram of an NVH testing apparatus for a vehicle drive axle according to some embodiments of this application; and Figure 7 This is a schematic diagram of the structure of an electronic device according to some embodiments of this application. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0024] The following describes, with reference to the accompanying drawings, a method, apparatus, and equipment for testing the NVH (Noise, Vibration, and Harshness) of a vehicle drive axle according to embodiments of this application.

[0025] It should be noted that, in the embodiments of this application, as... Figure 2As shown, the vehicle drive axle 5 is mounted on a test bench, which may include a load dynamometer 1 and a drive dynamometer 3. Specifically, during vehicle operation, various interference sources such as engine noise and road surface excitation will superimpose with the NVH signal of the vehicle drive axle 5, resulting in extremely low reliability of the test results. Mounting the vehicle drive axle 5 on a dedicated test bench confines the test environment to an anechoic chamber, reducing external interference. Simultaneously, the bench provides a stable mounting base, avoiding additional vibrations caused by changes in vehicle body posture and uneven road surfaces during actual vehicle operation, ensuring the stability and repeatability of the test process. The drive dynamometer 3 is used to simulate the power output of the engine and transmission. It can precisely apply the required speed and drive torque, or apply reverse drag torque, to the input end of the vehicle drive axle 5 according to a preset program, enabling the reproduction of dynamic driving conditions in a laboratory environment. The load dynamometer 1 is connected to the output end of the vehicle drive axle 5 and is used to apply a controllable load torque to simulate the ground resistance experienced by the wheels under different road conditions and driving states. Integrating the drive dynamometer 3 and the load dynamometer 1 into a controllable test bench system can accurately and repeatably simulate the complex dynamic working conditions that the vehicle drive axle 5 experiences on a real vehicle, which is the core prerequisite for the implementation of subsequent methods.

[0026] The NVH testing method for vehicle drive axles provided in this application embodiment can be performed by an electronic device, such as a mobile phone, tablet computer, handheld computer, or server, etc., without any limitation.

[0027] In this embodiment, the electronic device may include a processing component, a storage component, and a driving component. Optionally, the driving component and the processing component may be integrated, and the storage component may store an operating system, application programs, or other program modules. The processing component implements the NVH testing method for the vehicle drive axle provided in this embodiment by executing the application programs stored in the storage component.

[0028] like Figure 1 As shown, the NVH testing method for a vehicle drive axle according to an embodiment of this application may include the following steps: Step S1: Vibration acceleration sensors and sound sensors are installed at preset positions on the vehicle drive axle, including positions on the vehicle drive axle and positions around the vehicle drive axle. The preset positions can be calibrated according to actual conditions.

[0029] It should be noted that before performing this step, ensure that the vehicle's drive axle has completed the necessary pre-test preparations. For newly assembled drive axles or those not yet in a stable working state, they must first be run-in on a test bench according to preset specifications to eliminate initial assembly stress and allow internal moving parts to enter a stable working state. Only after the run-in is completed and the drive axle's condition is confirmed to be stable can the following sensor placement operation be performed.

[0030] Specifically, vibration acceleration sensors are used to measure the vibration signals generated when the vehicle's drive axle is excited. Their preset locations are usually key structural parts of the drive axle (such as input shaft flanges, axle housings, bearing seats, etc.). Sound sensors are used to measure the sound pressure radiated by the drive axle into the surrounding air during operation. Their placement must balance the integrity of signal acquisition and anti-interference capabilities. Their preset locations are usually specific spatial positions around the drive axle (such as directly above or at a specified distance to the side). During calibration, the operability of sensor installation must be considered, avoiding selecting preset locations in areas with limited space, where it is impossible to fix the sensor, or where directional calibration is impossible, to ensure that the placement operation can be completed smoothly.

[0031] The selection of preset locations must be combined with the operating conditions in the subsequent preset test strategy to ensure that the preset locations can stably collect signals under various operating conditions and that signal acquisition will not be interrupted or distorted due to changes in drive axle operating conditions. During installation, if the signal collected at a certain placement point has significant attenuation, a low signal-to-noise ratio, or cannot reflect the vibration / noise characteristics of the core working state of the drive axle, the location needs to be adjusted, and a new placement point with clear and stable signals needs to be selected to ensure that vibration and noise data can be collected in real time and accurately during subsequent testing.

[0032] Step S2: Obtain the background noise of the test bench through a sound sensor.

[0033] Specifically, since noise signals are linearly superimposed in the air, background noise should be acquired to allow for subsequent validity assessment and correction of the total noise measurement. This step must be performed after the drive axle has been mounted on the test bench and is in a non-operational state. To ensure that the acoustic environment for background noise measurement is consistent with the subsequent formal testing, the auxiliary systems of the test bench must be started first, and the mechanical connection between the drive dynamometer and the drive axle input terminal must be disconnected (e.g., by disconnecting). Figure 1 (The input drive shaft is shown). The dynamometer is then controlled to enter no-load operation mode, causing its spindle to run according to a preset background noise test speed program. This speed program typically needs to cover the entire speed range of the formal test. In this state, the core components of the drive axle, such as gears and bearings, remain stationary. At this time, sound pressure signals at each measuring point are collected and recorded using sound sensors; this is the background noise of the test system at the current speed. This data can be aggregated and stored in a database as a benchmark for subsequent judgment of the validity of the drive axle's own noise signal and for making necessary corrections.

[0034] Step S3: Obtain the preset test strategy for the vehicle's drive axle. The preset test strategy can be calibrated according to actual conditions.

[0035] Specifically, a pre-defined test strategy is a test plan framework pre-established to evaluate the NVH performance of a vehicle's drive axle. Its core function is to provide clear execution guidelines for subsequent dynamometer control and vibration and sound information collection, ensuring that the testing process is orderly and efficient, and that the test results accurately reflect the NVH performance of the drive axle in actual use scenarios. The pre-defined test strategy should include various dynamic processes, such as forward-rotation forward-drive acceleration tests and forward-rotation reverse-drag deceleration tests.

[0036] The forward-rotation, forward-drive acceleration test simulates the vehicle's operating conditions when the driver depresses the accelerator pedal. In this embodiment, the dynamometer system is set to speed control mode to control the input shaft speed of the drive axle, causing the simulated vehicle speed to increase from an initial value of 5 km / h to 160 km / h or 80% of the maximum permissible speed of the drive axle (whichever comes first) at a rate of 50 r / s. Input torques of 25 Nm and 30% of the maximum drive axle load are used to examine the differences in NVH characteristics of the drive axle under different acceleration loads. Throughout the acceleration process, vibration, noise signals, and input shaft speed signals at each measuring point are recorded simultaneously. To ensure data reliability, this test procedure needs to be repeated three times.

[0037] The forward-rotation reverse-dragging deceleration test simulates the coasting deceleration condition of a vehicle when the accelerator pedal is released and the engine reverse-dragging the vehicle. In this embodiment, the dynamometer system is also set to speed control mode, controlling the input shaft speed of the drive axle so that the simulated vehicle speed starts from 160 km / h or 80% of the maximum vehicle speed and decreases at a rate of -50 r / s to 5 km / h. The input torques are -25 Nm and -10% of the maximum load torque of the drive axle, used to stimulate and evaluate NVH characteristics under different reverse-dragging intensities. Throughout the deceleration process, vibration and noise signals and input shaft speed signals at all measuring points are recorded simultaneously. This procedure should also be repeated three times.

[0038] The specific parameters in the preset test strategy, including start and end speeds, speed change rate, and torque threshold, can be flexibly calibrated and adjusted according to the technical specifications of different drive axle models. Once calibrated, the test strategy will be stored in the control system as an executable program or parameter set, facilitating direct recall in subsequent tests and improving test execution efficiency.

[0039] Step S4: Control the load dynamometer and the drive dynamometer according to the preset test strategy to obtain the vibration information and sound information of the vehicle drive axle through the vibration acceleration sensor and the sound sensor, respectively.

[0040] Specifically, the load dynamometer applies corresponding resistance torque to the output end of the drive axle according to the output load requirements in the preset strategy, simulating road resistance during actual vehicle operation. The drive dynamometer, acting as the active source, applies precise drive torque and speed to the input end of the drive axle according to the preset strategy, simulating engine drag during deceleration, providing precise negative torque and speed. It is important to note that the control of the drive dynamometer and the load dynamometer should be highly synchronized to ensure that the recorded vibration and sound data are aligned with the operating parameters such as speed and torque at each moment on the time axis. This is a prerequisite for subsequent order analysis, spectrum analysis, and operating condition correlation.

[0041] While the dynamometer accurately reproduces the preset operating conditions, the vibration acceleration sensor and sound sensor are activated to synchronously collect vibration and sound information from the drive axle. Key operating conditions should be repeatedly measured to verify data repeatability and eliminate random errors. In this embodiment, the sound level meter (including the sound sensor) used should meet the requirements of a Class 1 sound level meter as specified in GB / T 3785.1. Before and after each measurement sequence, each sound level meter should be calibrated using a Class 1 sound calibrator conforming to GB / T 15173. Without any adjustments, the deviation between the readings of two consecutive calibrations should not exceed 0.5 dB. If this deviation exceeds the tolerance, the sound data obtained during that measurement is considered invalid, and the test must be re-tested after investigating equipment or environmental causes.

[0042] For the data acquisition and analysis system, vibration acceleration signals along each axis must be acquired synchronously at a sufficiently high sampling rate (usually no less than twice the preset highest analysis frequency). The A / D conversion resolution of the acquisition system itself should be no less than 24 bits to provide a high dynamic range and ensure that both weak and strong signals are recorded without distortion. Simultaneously, the data acquisition and analysis system should also integrate synchronous measurement and real-time spectrum analysis functions for parameters such as sound pressure level, vibration level, rotational speed, and torque. This not only enables online monitoring of data quality and preliminary diagnosis of operating conditions during testing, but also ensures the standardization and integrity of the acquired raw data in terms of format, timing, and parameter dimensions. This provides a standardized, high-quality raw dataset for subsequent data preprocessing, multi-dimensional signal analysis, and the generation of final NVH test results.

[0043] Step S5: Calculate the noise difference between the sound information and the background noise.

[0044] Specifically, the sound information collected in step S4 is compared with the background noise sound pressure level measured at the corresponding speed in step S2, and the difference between the two is calculated. This difference reflects the significance of the noise signal generated by the drive axle itself under specific operating conditions relative to the inherent background noise of the entire test system. The larger the difference, the higher the proportion of noise components in the drive axle, and the purer and more reliable the measurement data, providing a quantitative basis for the next step of determining whether the data can be used for final analysis.

[0045] Step S6: In response to the noise difference meeting the preset test validity conditions, generate the NVH test results of the vehicle drive axle based on the preset test strategy, vibration information and sound information.

[0046] Specifically, the noise difference calculated in step S5 is first compared with a preset validity threshold. When the difference is greater than or equal to the threshold, the system determines that the sound information at that operating point meets the preset test validity conditions and proceeds to the subsequent analysis process. For data points that do not meet the conditions, their sound information will be marked as being excessively affected by background noise and will not be included in the final result analysis, or will only be used as a reference. This judgment step ensures the authority and accuracy of the final test results.

[0047] Then, the effective data is processed and analyzed, the preset test strategy is parsed, and the status information that can reflect the working status of the drive bridge throughout the test process is extracted. At the same time, according to the predetermined analysis parameters, the collected vibration acceleration signal and sound signal are preprocessed by filtering, noise reduction, and outlier removal. According to the working condition sequence and parameter information in the preset test strategy, the preprocessed vibration information and sound information are associated with the corresponding working conditions one by one.

[0048] Finally, based on the correlated data, a multi-dimensional analysis method is used to generate the final NVH test results for the drive axle. Specifically, this can be achieved by calculating and plotting a panoramic curve of the A-weighted total sound pressure level as a function of engine speed (or vehicle speed), and generating high-resolution vibration and noise spectrum comparison charts at key operating points. The test results are presented in intuitive charts such as overall trend graphs and detailed spectrum diagrams. Furthermore, all test data and analysis reports are standardized and archived for reliable support for subsequent testing of similar products, performance optimization, and data comparison.

[0049] This embodiment first places vibration acceleration sensors and sound sensors at predetermined locations on the vehicle's drive axle, including positions on and around the drive axle. Then, the background noise of the test bench is acquired using the sound sensors, followed by the acquisition of a predetermined test strategy for the drive axle. Next, the load dynamometer and drive dynamometer are controlled according to the predetermined test strategy to acquire vibration and sound information from the drive axle via the vibration acceleration sensors and sound sensors, respectively. The noise difference between the sound information and the background noise is then calculated. Finally, in response to the noise difference meeting predetermined test validity conditions, NVH test results for the vehicle's drive axle are generated based on the predetermined test strategy, vibration information, and sound information. Therefore, it is possible to accurately acquire vibration and sound data of the drive axle through bench testing, and generate NVH results by combining the test strategy, providing professional data support for improving overall vehicle comfort.

[0050] In some embodiments of this application, such as Figure 2 As shown, the test bench may also include an input drive shaft 4, an output drive shaft 7, and a support frame 6. The vehicle drive axle 5 is mounted on the support frame 6. The input end of the vehicle drive axle 5 is connected to the main shaft of the drive dynamometer 3 through the input drive shaft 4, and the output end of the vehicle drive axle 5 is connected to the load dynamometer 1 through the output drive shaft 7.

[0051] Specifically, the support frame 6 constitutes the rigid base of the entire testing system. Its design must possess sufficient rigidity and mass to support the weight of components such as the drive axle 5 and drive shaft, and effectively suppress overall structural vibrations caused by torque changes and gear meshing impacts during testing, preventing these parasitic vibrations from interfering with the measurement of the NVH characteristics of the drive axle 5. The drive axle 5 is rigidly mounted on the support frame 6 through its mounting points to simulate its installation state on a real vehicle body, ensuring that the vibration transmission path is consistent with actual operating conditions. The input drive shaft 4 is the core power component connecting the drive source and the drive axle 5 under test. One end is rigidly connected to the main shaft of the drive dynamometer 3, and the other end is connected to the input shaft flange of the vehicle's drive axle 5. This drive shaft must meet strict dynamic balance requirements to minimize additional vibrations caused by its own rotational imbalance. The output drive shaft 7 is the load transmission carrier connecting the drive axle 5 and the load simulation device. It is responsible for transmitting the torque and speed output from the drive axle half-shaft to the load dynamometer 1. Similar to the input side, the output drive shaft 7 and the load dynamometer 1 are usually connected by a coupling with angle compensation capability, which can not only adapt to the deviations generated during installation, but also attenuate the vibrations that the load dynamometer may transmit in the reverse direction to a certain extent.

[0052] Through the coordinated design and arrangement of the support frame, input drive shaft, and output drive shaft, this embodiment constructs a standardized test bench mechanical system with controllable vibration interference and an installation state that closely matches the actual vehicle, providing reliable hardware support for reproducing the real working boundary conditions of the drive axle in a laboratory environment.

[0053] In some embodiments of this application, such as Figure 2 As shown, the output end of the vehicle drive axle 5 may include a first output end and a second output end of the vehicle drive axle 5, the load dynamometer 1 may include a first load dynamometer and a second load dynamometer, and the output drive shaft 7 includes a first output drive shaft and a second output drive shaft. The first output end of the vehicle drive axle 5 is connected to the first load dynamometer through the first output drive shaft, and the second output end of the vehicle drive axle 5 is connected to the second load dynamometer through the second output drive shaft.

[0054] Specifically, the first output end of the vehicle drive axle 5 is connected to the main shaft of the first load dynamometer located outside the anechoic chamber 2 via a first output drive shaft, passing through a corresponding acoustic partition or support. The second output end of the vehicle drive axle 5 is connected to the second load dynamometer in a similar manner via a second drive axle output drive shaft. During the test, the drive dynamometer 3 provides power to the input end of the drive axle 5 via the input drive shaft 4, and then the drive axle 5 splits the power through the output drive shafts 7 on both sides, ultimately transmitting it to the dual-side load dynamometer 1. The dual-side load dynamometer 1 can apply resistance torque synchronously or independently according to a preset test strategy, thereby accurately simulating different working conditions.

[0055] For example, when a vehicle turns, the left and right drive wheels will generate a speed difference. In this embodiment, two load dynamometers can be independently controlled, and a small speed difference or torque difference can be given to the two wheels through a preset program, thereby accurately reproducing the internal gear meshing and friction state when the drive axle differential is working on the test bench. Furthermore, during actual vehicle operation, the left and right wheels may encounter different road surface adhesion coefficients, or one wheel may drive over a speed bump or other asymmetrical impact conditions. In this case, the load torque of the two load dynamometers can be independently adjusted to simulate such asymmetrical load scenarios, thereby examining the bending deformation and vibration response of the drive axle housing and internal gear system under torsional loads, and evaluating its ability to isolate unbalanced road surface excitations.

[0056] In some embodiments of this application, such as Figure 2 As shown, the test bench may also include an anechoic chamber 2, a vehicle drive axle 5, a drive dynamometer 3, an input drive shaft 4, an output drive shaft 7, and a support frame 6, all of which are installed inside the anechoic chamber 2. The load dynamometer 1 is installed outside the anechoic chamber and is connected to the output drive shaft 7 via a through-wall shaft and an intermediate support.

[0057] Specifically, considering that auxiliary equipment such as the drive dynamometer 3 and the load dynamometer 1 generate significant noise during operation, if they share the same unprocessed space with the test component, their noise will severely interfere with the NVH test signal of the drive axle. Therefore, if... Figure 2 As shown, in this embodiment, the vehicle drive axle 5 and its directly connected mechanical parts (such as the drive dynamometer 3, input drive shaft 4, support frame 6, and the drive shaft connecting them) are placed inside the anechoic chamber 2. The inner wall of the anechoic chamber 2 can be lined with professional sound-absorbing materials such as glass wool and polyester fiber sound-absorbing panels, which can effectively absorb indoor sound waves, significantly reduce the influence of reflected sound and environmental noise, and create a near-reflection-free free sound field inside the chamber, providing a pure acoustic environment for accurate noise testing.

[0058] Meanwhile, the load dynamometer 1 is separately arranged outside the anechoic chamber 2, and its power connection to the drive axle output transmission shaft 7 inside the chamber is achieved through a through-wall shaft and intermediate support. This ensures the continuity of power transmission, allowing the through-wall shaft to accurately transmit torque. The intermediate support provides stable support for the shaft system and reduces rotational vibration. Furthermore, the walls of the anechoic chamber 2 isolate the noise of the load dynamometer 1 from the core testing area, preventing interference with the drive axle noise test. A special sound-insulating sealing kit is installed at the point where the through-wall shaft passes through the walls of the anechoic chamber 2, effectively blocking airborne sound leakage and ensuring the acoustic sealing performance of the anechoic chamber 2. The intermediate support adopts a low-vibration-transmission structural design and undergoes targeted vibration isolation treatment to minimize the transmission of structural vibration through the bearing housing and walls into the anechoic chamber 2, avoiding additional vibration interference and further ensuring the authenticity of the test data.

[0059] In some embodiments of this application, such as Figure 3 As shown, the vibration acceleration sensor 1 can be set at the input end and the output end of the vehicle drive axle 2 respectively, and the sound sensor 3 can be set directly above the vehicle drive axle 2. The vertical distance between the position of the sound sensor 3 and the housing of the vehicle drive axle 2 is the target preset distance.

[0060] Specifically, in this embodiment, the vibration acceleration sensor 1 can be a three-directional sensor, respectively arranged at key locations at the input and output ends of the vehicle drive axle 2. The input end measuring point is located at the flange of the drive axle input shaft. This location is the core input point of the transmission system's excitation force, directly capturing vibrations caused by input torque fluctuations, shaft misalignment, and the axial and radial components generated by the meshing force of the main reduction gear. By collecting the vibration signal at this measuring point, the intensity of the input excitation can be accurately assessed, and the response characteristics of the drive axle to the upstream transmission system excitation can be analyzed. The output end measuring point is located at a suitable position on the drive axle housing near the wheel hub bearing seat or the end of the half-shaft sleeve. This is the main point of application for load reaction force and wheel imbalance excitation, and can effectively reflect the transmission law of the vibration of the differential gears and bearings through the axle housing to the wheel end. By comparing the vibration spectra at the input and output ends, the transmission path and attenuation characteristics of the vibration within the drive axle housing can be further analyzed.

[0061] The sound sensor 3 can be arranged directly above the geometric center of the vehicle drive axle 2, and its vertical distance from the outer surface of the drive axle is strictly controlled to a preset target distance (e.g., 300mm). The sensor must be vertically pointed to the geometric center of the outer surface of the drive axle to ensure that the acoustic measurement conditions are consistent for each test, different batches and different models of drive axles, and that the test results have lateral comparative value. At the same time, the arrangement of the sensor vertically pointing to the geometric center of the drive axle can preferentially receive direct sound from the drive axle housing, significantly improve the signal-to-noise ratio, and ensure that the measurement results can truly reflect the noise radiation characteristics of the drive axle body.

[0062] In some embodiments of this application, the background noise of the test bench is obtained by means of a sound sensor, including: disconnecting the connection between the main shaft of the driving dynamometer and the input drive shaft; and controlling the driving dynamometer to run unloaded according to a preset background noise test strategy, so as to obtain the background noise of the test bench by means of a sound sensor.

[0063] Specifically, for background noise measurement, the power connection between the drive dynamometer and the drive axle must first be disconnected. This involves breaking the mechanical connection between the drive dynamometer's main shaft and the input drive shaft, for example, by disassembling the coupling or flange between them. This operation ensures that the internal rotating components of the drive axle, such as gears and bearings, remain stationary, thus physically eliminating the influence of drive axle operating noise on the measurement. At this point, the drive axle exists only as a static mechanical structure in the test environment. Simultaneously, to ensure the acoustic consistency of the background noise measurement environment with the subsequent formal testing, the auxiliary systems of the test bench (such as the cooling system and lubrication system) must be activated and maintained in normal operation.

[0064] Subsequently, the control drive switches the dynamometer to no-load operation mode. At this time, the dynamometer motor runs normally, but there is no load transmitted at the output end. The operation of the dynamometer must follow the preset background noise test strategy. This strategy usually requires the dynamometer spindle speed to cover the full speed range of the subsequent formal test (e.g., the speed range corresponding to 5km / h to 160km / h), and to use the same or similar rate for frequency sweeping as the formal test to ensure comprehensive capture of environmental and equipment interference noise at different speeds.

[0065] Under the aforementioned operating conditions, sound pressure signals are collected at specified measurement points using sound sensors. The resulting signals constitute the background noise data of the test bench. This data will serve as the core objective basis for determining the validity of subsequent test data, effectively eliminating measurement uncertainties caused by the noise of the test system itself. This is a crucial scientific prerequisite for ensuring the accuracy and reliability of the final NVH test results.

[0066] In some embodiments of this application, if the noise difference is greater than or equal to a first preset noise threshold, it is determined that the noise difference meets the preset test validity conditions; if the noise difference is less than the first preset noise threshold, it is determined that the noise difference does not meet the preset test validity conditions. The first preset noise threshold can be calibrated according to actual conditions.

[0067] Specifically, the noise difference is the difference between the collected drive axle sound information and the background noise of the test bench. The first preset noise threshold is the minimum acceptable signal-to-noise ratio required for the test, which can be set to 3dB in this embodiment to balance test accuracy and data availability.

[0068] If the noise difference is greater than or equal to the first preset noise threshold, it indicates that the noise generated by the drive axle is significantly higher than the background noise. In this case, the interference of the background noise on the total measurement value has been reduced to an acceptable range. Based on this, it can be determined that the measured sound information can reliably reflect the noise radiation level of the drive axle itself. If the noise difference is less than the first preset noise threshold, it indicates that the drive axle noise signal is highly superimposed on the background noise, resulting in a low signal-to-noise ratio. Most of the energy in the sound information comes from the background noise, making it impossible to effectively separate or accurately assess the true noise level of the drive axle. Using such data will lead to distorted and non-reproducible analytical conclusions. Therefore, the system determines that it does not meet the valid test conditions and the data point needs to be removed or the test retested.

[0069] In one embodiment of this application, before generating the NVH test results of the vehicle drive axle based on a preset test strategy, vibration information, and sound information, the method further includes: in response to the noise difference meeting preset test validity conditions, determining whether the noise difference is less than or equal to a second preset noise threshold, wherein the second preset noise threshold is greater than a first preset noise threshold; if the noise difference is less than or equal to the second preset noise threshold, obtaining a sound difference correction table, and correcting the sound information based on the sound difference correction table and the noise difference. The second preset noise threshold can be calibrated according to actual conditions.

[0070] Specifically, in this embodiment, during the NVH test data preprocessing stage, the original sound information that has been determined to be valid undergoes further refined processing. Even after the noise difference meets the preset test validity conditions, there are still gradient differences in data quality. Directly using all valid original data to generate results will introduce the residual influence of background noise into the analysis conclusions. Especially under conditions where the drive axle's own noise is low, this can easily lead to overestimation of the measured values, interfering with the judgment of the drive axle's true NVH performance. Therefore, this embodiment introduces a second preset noise threshold, which is greater than the first preset noise threshold and can be 10dB.

[0071] If the noise difference is greater than the second preset noise threshold, it indicates that the drive axle noise is significantly higher than the background noise. In this case, the interference of background noise on the measurement results is negligible, and the original sound information can be directly regarded as a high-precision approximation of the drive axle noise level without correction. If the noise difference is greater than or equal to the first preset noise threshold, but less than or equal to the second preset noise threshold, it indicates that although the data meets the basic valid conditions, the contribution of background noise to the total measurement value is not negligible. Directly using the original sound information will overestimate the actual noise level of the drive axle. This range is the applicable range for sound difference correction. For data requiring correction, a sound difference correction table can be used. This table uses the noise difference value as an index and pre-marks the correction value (usually a negative number) for the corresponding operating condition. During correction, the original sound information is added to the corresponding correction value to obtain the sound data after removing background interference, thereby effectively offsetting the superimposed effect of background noise on the measurement results and ensuring that the corrected sound information is closer to the true noise of the drive axle, providing more reliable data support for subsequent NVH spectrum analysis.

[0072] As a specific embodiment of this application, such as Figure 4 As shown, the NVH testing method for a vehicle drive axle may include the following steps: S101, Set up the test bench.

[0073] S102, a vibration acceleration sensor and a sound sensor are respectively arranged at preset positions on the vehicle drive axle. Specifically, the vibration sensor is arranged at key parts such as the input / output end, and the sound sensor is arranged at a specified distance directly above it.

[0074] S103 acquires the background noise of the test bench through a sound sensor. Specifically, with the drive axle in a silent state, its connection to the drive dynamometer is disconnected, the drive dynamometer is controlled to run under no-load, and the sound signal at this time is collected as the background noise.

[0075] S104, Obtain the preset test strategy for the vehicle drive axle.

[0076] S105 controls the load dynamometer and drive dynamometer according to the preset test strategy to obtain vibration and sound information of the vehicle drive axle through the vibration acceleration sensor and sound sensor, respectively.

[0077] S106, calculate the noise difference between the sound information and the background noise, and determine whether the noise difference meets the preset test validity conditions. If yes, jump to S106; otherwise, determine that the data point is invalid due to the low signal-to-noise ratio, mark it or remove it, and do not participate in the final result generation.

[0078] S107, determine whether the noise difference is greater than the second noise threshold. If yes, it indicates that the drive bridge noise is significantly higher than the background noise, and jump to S108. If no, it indicates that the data is valid but is greatly affected by the background noise, and jump to S107.

[0079] S108. Query the sound difference correction table based on the noise difference value to correct the sound information. Specifically, as shown in the table below.

[0080]

[0081] S109 generates NVH test results for the vehicle drive axle based on a preset test strategy, vibration information, and sound information. Specifically, as follows... Figure 5 As shown, the test results show a relatively consistent trend, and the test repeatability is good, which can be used for subsequent development and verification of passenger vehicle drive axles.

[0082] In summary, the NVH testing method for a vehicle drive axle according to the embodiments of this application firstly arranges vibration acceleration sensors and sound sensors at preset positions on the vehicle drive axle, including positions on the vehicle drive axle and positions around the vehicle drive axle. Then, the background noise of the test bench is acquired through the sound sensor, followed by the acquisition of a preset test strategy for the vehicle drive axle. Next, the load dynamometer and drive dynamometer are controlled according to the preset test strategy to acquire vibration and sound information of the vehicle drive axle through the vibration acceleration sensors and sound sensors, respectively. Then, the noise difference between the sound information and the background noise is calculated. Finally, in response to the noise difference satisfying the preset test validity conditions, the NVH test results of the vehicle drive axle are generated based on the preset test strategy, vibration information, and sound information. Therefore, the vibration and sound data of the drive axle can be accurately acquired through bench testing, and NVH results can be generated in combination with the test strategy, providing professional data support for improving vehicle comfort.

[0083] Corresponding to the above embodiments, this application also proposes an NVH testing device for a vehicle drive axle.

[0084] like Figure 6 As shown, the NVH testing device 600 for a vehicle drive axle in this embodiment of the application includes: an arrangement module 610, a first acquisition module 620, a second acquisition module 630, a control module 640, a calculation module 650, and a generation module 660.

[0085] The system includes: a placement module 610 for placing vibration acceleration sensors and sound sensors at preset positions on the vehicle drive axle, including positions on and around the vehicle drive axle; a first acquisition module 620 for acquiring background noise of the test bench via the sound sensor; a second acquisition module 630 for acquiring a preset test strategy for the vehicle drive axle; a control module 640 for controlling the load dynamometer and drive dynamometer according to the preset test strategy to acquire vibration and sound information of the vehicle drive axle via the vibration acceleration sensor and sound sensor, respectively; a calculation module 650 for calculating the noise difference between the sound information and the background noise; and a generation module 660 for generating NVH test results for the vehicle drive axle based on the preset test strategy, vibration information, and sound information, in response to the noise difference meeting preset test validity conditions.

[0086] According to one embodiment of this application, the test bench further includes an input drive shaft, an output drive shaft, and a support frame, wherein the vehicle drive axle is mounted on the support frame, the input end of the vehicle drive axle is connected to the main shaft of the drive dynamometer via the input drive shaft, and the output end of the vehicle drive axle is connected to the load dynamometer via the output drive shaft.

[0087] According to one embodiment of this application, the output end of the vehicle drive axle includes a first output end and a second output end of the vehicle drive axle, the load dynamometer includes a first load dynamometer and a second load dynamometer, and the output drive shaft includes a first output drive shaft and a second output drive shaft. The first output end of the vehicle drive axle is connected to the first load dynamometer through the first output drive shaft, and the second output end of the vehicle drive axle is connected to the second load dynamometer through the second output drive shaft.

[0088] According to one embodiment of this application, the test bench further includes an anechoic chamber, in which the vehicle drive axle, drive dynamometer, input drive shaft, output drive shaft and support frame are all disposed. The load dynamometer is disposed outside the anechoic chamber and is connected to the output drive shaft through a through-wall shaft and an intermediate support.

[0089] According to one embodiment of this application, the arrangement module 610 is specifically used to set the vibration acceleration sensor at the input end and the output end of the vehicle drive axle respectively, and the sound sensor is set directly above the vehicle drive axle, and the vertical distance between the position of the sound sensor and the housing of the vehicle drive axle is a target preset distance.

[0090] According to one embodiment of this application, the first acquisition module 620 is specifically used to acquire the background noise of the test bench through a sound sensor, including: disconnecting the connection between the main shaft of the driving dynamometer and the input transmission shaft; controlling the driving dynamometer to run unloaded according to a preset background noise test strategy, so as to acquire the background noise of the test bench through the sound sensor.

[0091] According to one embodiment of this application, if the noise difference is greater than or equal to a first preset noise threshold, it is determined that the noise difference meets the preset test validity conditions; if the noise difference is less than the first preset noise threshold, it is determined that the noise difference does not meet the preset test validity conditions.

[0092] According to one embodiment of this application, before generating the NVH test results of the vehicle drive axle based on the preset test strategy, vibration information, and sound information, the generation module 660 further includes: in response to the noise difference meeting the preset test validity conditions, determining whether the noise difference is less than or equal to a second preset noise threshold, wherein the second preset noise threshold is greater than a first preset noise threshold; if the noise difference is less than or equal to the second preset noise threshold, obtaining a sound difference correction table, and correcting the sound information based on the sound difference correction table and the noise difference.

[0093] It should be noted that the above-described embodiments and explanations of the beneficial effects of the NVH testing method for vehicle drive axles also apply to the NVH testing apparatus for vehicle drive axles in the embodiments of this application. To avoid redundancy, they will not be elaborated in detail here.

[0094] In summary, the NVH testing device for a vehicle drive axle according to the embodiments of this application firstly arranges vibration acceleration sensors and sound sensors at preset positions on the vehicle drive axle using an arrangement module. These preset positions include those on the vehicle drive axle and those around it. Then, a first acquisition module acquires the background noise of the test bench through the sound sensor. Next, a second acquisition module acquires a preset test strategy for the vehicle drive axle. Following this, a control module controls the load dynamometer and drive dynamometer according to the preset test strategy to acquire vibration and sound information of the vehicle drive axle through the vibration acceleration sensor and sound sensor, respectively. Then, a calculation module calculates the noise difference between the sound information and the background noise. Finally, a generation module generates NVH test results for the vehicle drive axle based on the preset test strategy, vibration information, and sound information, in response to the noise difference meeting preset test validity conditions. Thus, it can accurately acquire vibration and sound data of the drive axle through bench testing, and generate NVH results in conjunction with the test strategy, providing professional data support for improving overall vehicle comfort.

[0095] Corresponding to the above embodiments, this application also proposes an electronic device.

[0096] like Figure 7 As shown, the electronic device 700 of this application embodiment includes a memory 710, a processor 720, and a computer program stored in the memory and executable on the processor. The processor executes the program to implement any of the above-described NVH test methods for vehicle drive axles.

[0097] The electronic device according to the embodiments of this application implements any of the above-mentioned NVH testing methods for vehicle drive axles when the processor executes a computer program. It achieves accurate acquisition of vibration and sound data of the drive axle through bench testing, and generates NVH results in combination with the testing strategy, providing professional data support for improving the comfort of the whole vehicle.

[0098] Specifically, in the embodiments of this application, 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0099] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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.

[0100] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for testing the NVH (Noise, Vibration, and Harshness) of a vehicle drive axle, characterized in that, The vehicle drive axle is mounted on a test bench, which includes a load dynamometer and a drive dynamometer. The method includes: Vibration acceleration sensors and sound sensors are respectively arranged at preset positions on the vehicle drive axle, wherein the preset positions include positions on the vehicle drive axle and positions around the vehicle drive axle; The background noise of the test bench is obtained through the sound sensor; Obtain the preset test strategy for the vehicle drive axle; The load dynamometer and the drive dynamometer are controlled according to the preset test strategy to obtain the vibration information and sound information of the vehicle drive axle through the vibration acceleration sensor and the sound sensor, respectively. Calculate the noise difference between the sound information and the background noise; In response to the noise difference meeting the preset test validity conditions, the NVH test results of the vehicle drive axle are generated according to the preset test strategy, the vibration information and the sound information.

2. The NVH testing method for a vehicle drive axle according to claim 1, characterized in that, The test bench also includes an input drive shaft, an output drive shaft, and a support frame, wherein... The vehicle drive axle is mounted on the support frame. The input end of the vehicle drive axle is connected to the main shaft of the drive dynamometer via an input drive shaft, and the output end of the vehicle drive axle is connected to the load dynamometer via an output drive shaft.

3. The NVH testing method for a vehicle drive axle according to claim 2, characterized in that, The output end of the vehicle drive axle includes a first output end and a second output end; the load dynamometer includes a first load dynamometer and a second load dynamometer; the output drive shaft includes a first output drive shaft and a second output drive shaft, wherein... The first output end of the vehicle drive axle is connected to the first load dynamometer via the first output drive shaft, and the second output end of the vehicle drive axle is connected to the second load dynamometer via the second output drive shaft.

4. The NVH testing method for a vehicle drive axle according to claim 2, characterized in that, The test bench also includes an anechoic chamber, in which the vehicle drive axle, the drive dynamometer, the input drive shaft, the output drive shaft, and the support frame are all disposed. The load dynamometer is disposed outside the anechoic chamber and is connected to the output drive shaft via a through-wall shaft and an intermediate support.

5. The NVH testing method for a vehicle drive axle according to claim 2, characterized in that, The vibration acceleration sensors are respectively installed at the input end and the output end of the vehicle drive axle, and the sound sensor is installed directly above the vehicle drive axle. The vertical distance between the position of the sound sensor and the housing of the vehicle drive axle is a target preset distance.

6. The NVH testing method for a vehicle drive axle according to claim 2, characterized in that, The step of acquiring the background noise of the test bench through the sound sensor includes: Disconnect the main shaft of the driving dynamometer from the input drive shaft; The drive dynamometer is controlled to run unloaded according to a preset background noise test strategy, so as to obtain the background noise of the test bench through the sound sensor.

7. The NVH testing method for a vehicle drive axle according to claim 2, characterized in that, The method further includes: If the noise difference is greater than or equal to the first preset noise threshold, then the noise difference is determined to meet the preset test validity conditions. If the noise difference is less than the first preset noise threshold, it is determined that the noise difference does not meet the preset test validity conditions.

8. The NVH testing method for a vehicle drive axle according to claim 7, characterized in that, Before generating the NVH test results of the vehicle drive axle based on the preset test strategy, the vibration information, and the sound information, the method further includes: In response to the noise difference meeting the preset test validity conditions, it is determined whether the noise difference is less than or equal to a second preset noise threshold, wherein the second preset noise threshold is greater than the first preset noise threshold; If the noise difference is less than or equal to the second preset noise threshold, then a sound difference correction table is obtained, and the sound information is corrected according to the sound difference correction table and the noise difference.

9. An NVH testing device for a vehicle drive axle, characterized in that, The vehicle drive axle is mounted on a test bench, which includes a load dynamometer and a drive dynamometer. The device includes: The module is used to arrange vibration acceleration sensors and sound sensors at preset positions on the vehicle drive axle, wherein the preset positions include positions on the vehicle drive axle and positions around the vehicle drive axle. The first acquisition module is used to acquire the background noise of the test bench through the sound sensor; The second acquisition module is used to acquire the preset test strategy of the vehicle drive axle; The control module is used to control the load dynamometer and the drive dynamometer according to the preset test strategy, so as to obtain the vibration information and sound information of the vehicle drive axle through the vibration acceleration sensor and the sound sensor, respectively. The calculation module is used to calculate the noise difference between the sound information and the background noise; The generation module is used to generate NVH test results for the vehicle drive axle in response to the noise difference meeting the preset test validity conditions, based on the preset test strategy, the vibration information, and the sound information.

10. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the NVH test method for a vehicle drive axle as described in any one of claims 1-8.

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