Vehicle body road noise performance optimization method and system, vehicle, equipment and medium

Abstract

The invention discloses a vehicle body road noise performance optimization method and system, a vehicle, equipment and a medium. The road noise performance optimization method of the vehicle body comprises the following steps: establishing a geometric model of the whole vehicle; arranging an excitation source on the road surface, testing the vehicle, and obtaining a time domain vibration signal of each detection point of the vehicle; taking a specified position of the model as a phase reference point, and obtaining a vehicle working deformation analysis result according to the time domain vibration signal; selecting a first excitation point and a second excitation point from the model, and performing modal excitation on the model through a vibration exciter to obtain each order of modal of the vehicle body; according to a working deformation analysis result, a modal order which contributes to working deformation analysis vibration most is identified from all orders of modals of the vehicle body; and according to the modal order with the maximum vibration contribution, carrying out structure optimization on the vehicle body modal. By adopting the method and the device, the contribution of each mode of the vehicle body to the noise and vibration in the vehicle under the driving condition can be identified, and the vehicle body mode is optimized according to the mode order with the maximum contribution, so that the road noise performance of the vehicle body is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a road noise performance optimization method and system for a vehicle body, a vehicle, equipment and a medium. BACKGROUND

[0002] The whole vehicle load type vehicle body is a load type structure assembly of a motor vehicle, which not only constitutes a passenger cabin space and provides installation interfaces of various assemblies, but also bears the core functions of structural mechanics load bearing, collision force transmission and vibration noise control. As a core carrier connecting the chassis system and the passenger cabin, the vehicle body is crucial to the whole vehicle dynamics. However, there is currently a lack of a method capable of identifying and quantifying the modal contribution of a passenger vehicle body, thereby optimizing the road noise performance. The road noise generated during vehicle driving is mainly transmitted into the vehicle through structure and acoustic radiation. When the external excitation frequency coincides with the natural modal frequency of the local structure of the vehicle body, structural resonance will be triggered, which will significantly amplify the vibration response and noise sound pressure level, thereby affecting the driving experience and comfort of the vehicle. SUMMARY

[0003] Therefore, it is necessary to provide a road noise performance optimization method and system for a vehicle body, a vehicle, equipment and a medium, which can identify the contribution of each modal of the vehicle body to the noise and vibration in the vehicle during driving conditions, and optimize the modal of the vehicle body according to the modal order with the largest contribution, thereby effectively improving the road noise performance of the vehicle body.

[0004] In a first aspect, a road noise performance optimization method for a vehicle body is provided, comprising: establishing a whole vehicle geometric model; setting an excitation source on a road surface and performing a through test of the excitation source on the vehicle to obtain a time domain vibration signal generated by each detection point on the vehicle; taking a specified position on the whole vehicle geometric model as a phase reference point and obtaining a working deformation analysis result of the vehicle according to the time domain vibration signal; selecting a first excitation point and a second excitation point from the whole vehicle geometric model, and in a stationary state, exciting the whole vehicle geometric model by a vibration exciter to obtain each modal of the vehicle body, wherein in the modal excitation, an excitation force along the three-axis direction of the whole vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point; According to the working deformation analysis result, the modal order with the largest vibration contribution in the working deformation analysis is identified from the each modal of the vehicle body; According to the modal order with the largest vibration contribution, the corresponding modal of the vehicle body is optimized.

[0005] Further, the establishment of the whole vehicle geometric model comprises: According to the real vehicle structure, the whole vehicle geometric model is established, wherein the whole vehicle geometric model represents the whole vehicle body contour through geometric nodes.

[0006] Further, the excitation source is arranged on the road surface, and the vehicle passes through the test of the excitation source to obtain the time-domain vibration signals generated by each detection point on the vehicle, including: A rubber strip of a predetermined size is arranged on the flat road surface as the excitation source; A plurality of detection points are arranged on the vehicle, and the vehicle is controlled to pass through the excitation source at a predetermined vehicle speed to obtain the time-domain vibration signals generated by the plurality of detection points.

[0007] Further, the specified position on the whole vehicle geometric model is taken as a phase reference point, and the working deformation analysis result of the vehicle is obtained according to the time-domain vibration signals, including: The time-domain vibration signals are converted into frequency-domain signals, and the frequency-domain signals are subjected to spectral average processing; The specified position on the whole vehicle geometric model is taken as a phase reference point, and the linear spectrum of the frequency-domain signals is calculated; The working deformation analysis result of the vehicle is obtained according to the linear spectrum.

[0008] Further, the first excitation point and the second excitation point are selected from the whole vehicle geometric model, and in a static state, the modal excitation is performed on the whole vehicle geometric model by the exciter to obtain each order modal of the vehicle body, wherein in the modal excitation, the excitation force along the three-axis direction of the whole vehicle coordinate system is applied to the first excitation point, and the excitation force along the normal direction of the chassis plane is applied to the second excitation point, including: The intersection point of the body A pillar and the chassis plane is selected as the first excitation point, the excitation force along the X, Y and Z directions of the whole vehicle coordinate system is applied to the first excitation point, the intersection point of the body C pillar extension line and the chassis is selected as the second excitation point, and the excitation force along the normal direction of the chassis plane is applied to the second excitation point; In a static state, the exciter is installed at the first excitation point and the second excitation point for modal testing, a random excitation signal is used to trigger the excitation force a predetermined number of times in a predetermined frequency range for each excitation direction, and each order modal of the vehicle body is obtained.

[0009] Further, in the modal testing, the frequency response function curve and the coherence function curve are checked to ensure that the frequency response function peak value meets the set requirements and the coherence function at the resonance peak is not less than a predetermined value.

[0010] Further, the each order modal of the vehicle body is obtained, including: The frequency response function of the vehicle body in a predetermined frequency range is obtained, and the least square complex frequency domain method is used to identify each order modal of the vehicle body.

[0011] Secondly, a road noise performance optimization system for a vehicle body is provided, including: Create a module to build the vehicle's geometric model; The setting module is used to set an excitation source on the road surface and conduct a pass test on the vehicle using the excitation source to obtain the time-domain vibration signal generated at each detection point on the vehicle. The working deformation analysis module is used to obtain the results of the working deformation analysis of the vehicle based on the time-domain vibration signal, using a specified position on the vehicle geometric model as a phase reference point. The testing module is used to select a first excitation point and a second excitation point from the vehicle geometric model, and in a static state, to perform modal excitation on the vehicle geometric model through a vibrator to obtain the various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point. The optimization module is used to identify the mode order that contributes the most to the vibration in the working deformation analysis from the various modes of the vehicle body, based on the results of the working deformation analysis, and to perform structural optimization on the corresponding mode of the vehicle body based on the mode order that contributes the most to the vibration.

[0012] Thirdly, a vehicle is provided, comprising: a road noise performance optimization system for the vehicle body according to the second aspect described above.

[0013] Fourthly, a computer device is provided, 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 the steps of the method for optimizing the road noise performance of a vehicle body according to the first aspect and any possible implementation of the first aspect.

[0014] Fifthly, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the method for optimizing road noise performance of a vehicle body according to the first aspect and any possible implementation thereof.

[0015] Using the embodiments of this application, a vehicle geometric model is first established; then, an excitation source is set on the road surface, and the vehicle is subjected to a pass-through test to obtain time-domain vibration signals generated at various detection points on the vehicle; next, a designated position on the vehicle geometric model is used as a phase reference point, and the results of the vehicle's working deformation analysis are obtained based on the time-domain vibration signals; then, a first excitation point and a second excitation point are selected from the vehicle geometric model, and in a static state, modal excitation is performed on the vehicle geometric model using a vibrator to obtain various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point; then, based on the results of the working deformation analysis, the mode order that contributes the most to the vibration in the working deformation analysis is identified from the various modes of the vehicle body; finally, based on the mode order that contributes the most to the vibration, the corresponding mode of the vehicle body is structurally optimized. Thus, the contribution of each mode of the vehicle body to in-vehicle noise and vibration under driving conditions can be identified, and the vehicle body modes can be optimized based on the mode order that contributes the most, thereby effectively improving the road noise performance of the vehicle body. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A flowchart illustrating the method for optimizing road noise performance of a vehicle body as provided in this application embodiment; Figure 2 This is a geometric model drawing of the whole vehicle provided in the embodiments of this application; Figure 3 The integrated frequency response function curve for deformation analysis provided in the embodiments of this application; Figure 4 The diagram shows the results of the vehicle body working deformation analysis provided in the embodiments of this application; Figure 5 The comprehensive frequency response function curve of the whole vehicle body modal test provided in the embodiments of this application; Figure 6 The vehicle body modal frequencies and modal array diagrams provided in the embodiments of this application; Figure 7 Technical flowcharts provided for embodiments of this application; Figure 8 A structural block diagram of the road noise performance optimization system for a vehicle body provided in this application embodiment; Figure 9 This is a structural block diagram of a computer device provided in an embodiment of this application. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the application. Furthermore, it should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings.

[0018] It should be noted that, unless otherwise specified, the embodiments and features of the embodiments in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] The following describes in detail, with reference to the accompanying drawings, a method, system, vehicle, device, and medium for optimizing road noise performance of a vehicle body according to embodiments of this application.

[0020] Figure 1 This is a flowchart of a method for optimizing road noise performance of a vehicle body according to an embodiment of this application. Figure 1 As shown, and in combination Figure 7 The method for optimizing road noise performance of a vehicle body according to an embodiment of this application includes the following steps: S101: Establish the geometric model of the whole vehicle.

[0021] In one embodiment of this application, establishing the vehicle geometric model includes: establishing the vehicle geometric model based on the actual vehicle structure, wherein the vehicle geometric model represents the vehicle body contour through geometric nodes.

[0022] Combination Figure 2 As shown, the outline of the entire vehicle body is roughly described by geometric nodes, and key areas of interest are highlighted. A simplified geometric model that is similar to the structure of the actual vehicle is established, and sensors are placed at the corresponding positions on the actual vehicle according to the model nodes.

[0023] S102: Set up an excitation source on the road surface and conduct a pass test on the vehicle using the excitation source to obtain the time-domain vibration signal generated at each detection point on the vehicle.

[0024] In one embodiment of this application, the step of setting an excitation source on the road surface and performing a pass test on the vehicle to obtain time-domain vibration signals generated at each detection point on the vehicle includes: setting a rubber strip of a predetermined size on a flat road surface as the excitation source; setting multiple detection points on the vehicle and controlling the vehicle to pass through the excitation source at a predetermined speed to obtain time-domain vibration signals generated at multiple detection points.

[0025] In one specific example, a rubber strip measuring 3 m long, 0.05 m wide, and 10 mm thick is placed on a smooth road surface as the excitation source. Sensors are positioned at corresponding locations on the vehicle according to the geometric model nodes of the whole vehicle, serving as detection points. The vehicle passes over the rubber strip at a constant speed of 60 km / h, and the time-domain vibration signals generated at each detection point during this process are recorded using a data acquisition system. In other examples, the settings can be customized according to actual needs.

[0026] S103: Using a designated position on the vehicle's geometric model as a phase reference point, and obtaining the results of the vehicle's working deformation analysis based on the time-domain vibration signal.

[0027] In one embodiment of this application, the step of using a designated position on the vehicle geometric model as a phase reference point and obtaining the result of the vehicle's working deformation analysis based on the time-domain vibration signal includes: converting the time-domain vibration signal into a frequency-domain signal and performing spectral averaging on the frequency-domain signal; using the designated position on the vehicle geometric model as a phase reference point and calculating the linear spectrum of the frequency-domain signal; and obtaining the result of the vehicle's working deformation analysis based on the linear spectrum.

[0028] The temporal vibration signal is converted into a frequency domain signal using Fast Fourier Transform (FFT). Taking a plug-in hybrid electric vehicle as an example, its operational deformation analysis results are as follows: Figure 3 As shown, the mode shapes and data for the working deformation analysis are as follows: Figure 4 As shown.

[0029] S104: Select a first excitation point and a second excitation point from the vehicle geometric model, and in a static state, perform modal excitation on the vehicle geometric model through a vibrator to obtain various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point.

[0030] In one embodiment of this application, the step of selecting a first excitation point and a second excitation point from the vehicle geometric model, and performing modal excitation on the vehicle geometric model in a static state using a vibrator to obtain various vehicle body modes, wherein, in the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point, includes: selecting the intersection point of the A-pillar of the vehicle body and the chassis plane as the first excitation point, applying excitation forces along the X, Y, and Z directions of the vehicle coordinate system to the first excitation point, selecting the intersection point of the extension line of the C-pillar of the vehicle body and the chassis as the second excitation point, and applying an excitation force along the normal direction of the chassis plane to the second excitation point; in a static state, the vibrator is installed at the first excitation point and the second excitation point respectively to perform modal testing, and within a predetermined frequency range, a random excitation signal is used to trigger the excitation force a predetermined number of times in each excitation direction to obtain various vehicle body modes.

[0031] In one specific example, the analysis frequency range is 2–100 Hz, and the frequency resolution is set to 0.5 Hz. Each excitation direction is triggered 30 times using a random excitation signal, and then averaged. In other examples, these settings can be adjusted according to actual needs.

[0032] In one embodiment of this application, during the modal test, the frequency response function curve and the coherence function curve are checked to ensure that the peak value of the frequency response function meets the set requirements and that the coherence function is not lower than a predetermined value at the resonance peak.

[0033] In one specific example, it is required that the frequency response function peak is obvious and the coherence function is not lower than 0.9 at the resonance peak. In other examples, the settings can be adjusted according to actual needs.

[0034] In one embodiment of this application, obtaining the vehicle body modes includes: acquiring the frequency response function of the vehicle body within a predetermined frequency range, and identifying the vehicle body modes using the least squares complex frequency domain method.

[0035] Specifically, based on the reciprocity principle, matrix transformation is performed on the collected data. Through FFT transformation and autospectral and cross-spectral analysis, the frequency response function of the vehicle body in the frequency range of 2–100 Hz is obtained. The least squares complex frequency domain method is then used to identify the various modes of the vehicle body. In other examples, the frequency range can be set according to actual needs. The overall vehicle modal frequency response function curve is shown below. Figure 5 As shown, the modal frequencies and modal arrays of the entire vehicle body are as follows: Figure 6 As shown.

[0036] S105: Based on the results of the working deformation analysis, identify the mode order that contributes the most to the vibration in the working deformation analysis from the various modes of the vehicle body.

[0037] S106: Based on the mode order that contributes the most to the vibration, perform structural optimization on the corresponding mode of the vehicle body.

[0038] For example, if the problem frequency is around 40Hz, by comparing the working deformation analysis results and the modal array results and performing modal decoupling, it can be found that the mode with the greatest impact on the working deformation analysis results at 40Hz is the second-order mode of the vehicle body. Therefore, optimization can be performed on the second-order mode of the vehicle body. Figure 7 The technical flowchart provided for this application, such as Figure 7 As shown, after preparing the relevant vehicles and instruments, a geometric model is established based on the structural characteristics of the vehicle. An excitation source is placed on a flat road surface to conduct excitation source tests on the vehicle. The tests are repeated multiple times, and the system synchronously records the time-domain vibration signals at each measuring point. Then, the signals are processed by FFT and spectral averaging. A linear spectrum is calculated using a specific position of the longitudinal beam as the phase reference point. The consistency of the results is then judged through working deformation analysis. If the results are inaccurate, the test is repeated; if they are accurate, the vehicle body modal test is performed. After obtaining the frequency response function curve, the various modes of the vehicle body are calculated using the least squares complex frequency domain method. Combined with the working deformation analysis data, the test results are modally decoupled, and finally, the mode order with the largest vibration contribution in the working deformation analysis test is obtained.

[0039] According to the method for optimizing the road noise performance of the vehicle body according to the embodiments of this application, firstly, a vehicle geometric model is established; then, an excitation source is set on the road surface, and the vehicle is subjected to a pass test to obtain the time-domain vibration signals generated at each detection point on the vehicle; then, a designated position on the vehicle geometric model is used as a phase reference point, and the results of the vehicle's working deformation analysis are obtained based on the time-domain vibration signals; then, a first excitation point and a second excitation point are selected from the vehicle geometric model, and in a static state, modal excitation is performed on the vehicle geometric model through a vibrator to obtain the various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point; then, based on the results of the working deformation analysis, the mode order that contributes the most to the vibration in the working deformation analysis is identified from the various modes of the vehicle body; finally, based on the mode order that contributes the most to the vibration, the corresponding mode of the vehicle body is structurally optimized. Therefore, it is possible to identify the contribution of each vehicle body mode to in-vehicle noise and vibration during driving conditions, and optimize the vehicle body modes according to the order of the mode with the largest contribution, thereby effectively improving the road noise performance of the vehicle body.

[0040] Figure 8 This is a structural block diagram of a road noise performance optimization system for a vehicle body according to an embodiment of this application. Figure 8As shown, the road noise performance optimization system for a vehicle body according to an embodiment of this application includes: a creation module 810, a setting module 820, a working deformation analysis module 830, a testing module 840, and an optimization module 850, wherein: Create module 810 to build the vehicle's geometric model; Setting module 820 is used to set an excitation source on the road surface and perform a pass test on the vehicle using the excitation source to obtain the time-domain vibration signal generated at each detection point on the vehicle. The working deformation analysis module 830 is used to obtain the working deformation analysis results of the vehicle based on the time-domain vibration signal, using a specified position on the vehicle geometric model as a phase reference point. The test module 840 is used to select a first excitation point and a second excitation point from the vehicle geometric model, and in a static state, to perform modal excitation on the vehicle geometric model through a vibrator to obtain various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point. The optimization module 850 is used to identify the mode order that contributes the most to the vibration in the working deformation analysis from the various modes of the vehicle body, based on the results of the working deformation analysis, and to perform structural optimization on the corresponding mode of the vehicle body based on the mode order that contributes the most to the vibration.

[0041] According to the vehicle body road noise performance optimization system of this application embodiment, firstly, a whole vehicle geometric model is established; then, an excitation source is set on the road surface, and the vehicle is subjected to a pass test to obtain the time-domain vibration signals generated at each detection point on the vehicle; then, a specified position on the whole vehicle geometric model is used as a phase reference point, and the results of the vehicle's working deformation analysis are obtained based on the time-domain vibration signals; then, a first excitation point and a second excitation point are selected from the whole vehicle geometric model, and in a static state, the whole vehicle geometric model is modally excited by a vibrator to obtain the various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the whole vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point; then, based on the results of the working deformation analysis, the mode order that contributes the most to the vibration in the working deformation analysis is identified from the various modes of the vehicle body; finally, based on the mode order that contributes the most to the vibration, the corresponding mode of the vehicle body is structurally optimized. Therefore, it is possible to identify the contribution of each vehicle body mode to in-vehicle noise and vibration during driving conditions, and optimize the vehicle body modes according to the order of the mode with the largest contribution, thereby effectively improving the road noise performance of the vehicle body.

[0042] Specific limitations regarding the road noise performance optimization system for the vehicle body can be found in the limitations of the road noise performance optimization method for the vehicle body described above, and will not be repeated here. Each module of the aforementioned road noise performance optimization system for the vehicle body can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0043] In one embodiment, a vehicle is provided, comprising: first, establishing a complete vehicle geometric model; then, setting an excitation source on the road surface and conducting a pass-through test on the vehicle to obtain time-domain vibration signals generated at various detection points on the vehicle; then, using a designated position on the complete vehicle geometric model as a phase reference point, and obtaining the results of the vehicle's working deformation analysis based on the time-domain vibration signals; then, selecting a first excitation point and a second excitation point on the complete vehicle geometric model, and in a static state, performing modal excitation on the complete vehicle geometric model using a vibrator to obtain various modes of the vehicle body, wherein, in the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point; then, based on the results of the working deformation analysis, identifying the mode order that contributes the most to the vibration in the working deformation analysis from the various modes of the vehicle body; finally, performing structural optimization on the corresponding mode of the vehicle body based on the mode order that contributes the most to the vibration. Thus, the contribution of each mode of the vehicle body to in-vehicle noise and vibration under driving conditions can be identified, and the vehicle body modes can be optimized based on the mode order that contributes the most, thereby effectively improving the road noise performance of the vehicle body.

[0044] Furthermore, other components and functions of the vehicle according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0045] In one embodiment, a computer device is provided. Figure 9 This is a structural block diagram of the computer device provided in the embodiments of this application, with reference to... Figure 9 The computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned method embodiment for optimizing road noise performance of the vehicle body. For example, it executes: establishing a complete vehicle geometric model; An excitation source is set up on the road surface, and a vehicle is subjected to a pass test of the excitation source to obtain the time-domain vibration signal generated at each detection point on the vehicle. Using a designated position on the vehicle's geometric model as a phase reference point, the results of the vehicle's working deformation analysis are obtained based on the time-domain vibration signal. A first excitation point and a second excitation point are selected from the vehicle geometric model. In a static state, the vehicle geometric model is subjected to modal excitation by a vibrator to obtain the various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point. Based on the results of the working deformation analysis, the mode order that contributes the most to the vibration in the working deformation analysis is identified from each mode of the vehicle body. Based on the mode order that contributes the most to the vibration, the corresponding mode of the vehicle body is structurally optimized.

[0046] This application also provides a computer-readable storage medium storing a computer program. When the processor executes the computer program, it implements the aforementioned embodiment of the vehicle road noise performance optimization method. For example, it executes: establishing a whole vehicle geometric model; An excitation source is set up on the road surface, and a vehicle is subjected to a pass test of the excitation source to obtain the time-domain vibration signal generated at each detection point on the vehicle. Using a designated position on the vehicle's geometric model as a phase reference point, the results of the vehicle's working deformation analysis are obtained based on the time-domain vibration signal. A first excitation point and a second excitation point are selected from the vehicle geometric model. In a static state, the vehicle geometric model is subjected to modal excitation by a vibrator to obtain the various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point. Based on the results of the working deformation analysis, the mode order that contributes the most to the vibration in the working deformation analysis is identified from each mode of the vehicle body. Based on the mode order that contributes the most to the vibration, the corresponding mode of the vehicle body is structurally optimized.

[0047] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for optimizing road noise performance of a vehicle body, characterized in that, include: Establish the vehicle's geometric model; An excitation source is set up on the road surface, and a vehicle is subjected to a pass test of the excitation source to obtain the time-domain vibration signal generated at each detection point on the vehicle. Using a designated position on the vehicle's geometric model as a phase reference point, the results of the vehicle's working deformation analysis are obtained based on the time-domain vibration signal. A first excitation point and a second excitation point are selected from the vehicle geometric model. In a static state, the vehicle geometric model is subjected to modal excitation by a vibrator to obtain the various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point. Based on the results of the working deformation analysis, the mode order that contributes the most to the vibration in the working deformation analysis is identified from each mode of the vehicle body. Based on the mode order that contributes the most to the vibration, the corresponding mode of the vehicle body is structurally optimized.

2. The method for optimizing road noise performance of a vehicle body according to claim 1, characterized in that, The establishment of the vehicle geometric model includes: Based on the actual vehicle structure, a complete vehicle geometric model is established, wherein the complete vehicle geometric model represents the vehicle body contour through geometric nodes.

3. The method for optimizing road noise performance of a vehicle body according to claim 1, characterized in that, The step of setting up an excitation source on the road surface and conducting a pass-through test on the vehicle to obtain time-domain vibration signals generated at various detection points on the vehicle includes: A rubber strip of predetermined size is set on a flat road surface as the excitation source; Multiple detection points are set on the vehicle, and the vehicle is controlled to pass through the excitation source at a predetermined speed to obtain the time-domain vibration signals generated by the multiple detection points.

4. The method for optimizing road noise performance of a vehicle body according to claim 1, characterized in that, The step of using a designated position on the vehicle's geometric model as a phase reference point and obtaining the results of the vehicle's working deformation analysis based on the time-domain vibration signal includes: The time-domain vibration signal is converted into a frequency-domain signal, and the frequency-domain signal is then subjected to spectral averaging. Using a designated position on the vehicle's geometric model as a phase reference point, the linear spectrum of the frequency domain signal is calculated; The results of the working deformation analysis of the vehicle are obtained based on the linear spectrum.

5. The method for optimizing road noise performance of a vehicle body according to claim 1, characterized in that, The process involves selecting a first excitation point and a second excitation point from the vehicle geometric model, and in a static state, performing modal excitation on the vehicle geometric model using a vibrator to obtain various vehicle body modes. In this modal excitation, an excitation force is applied to the first excitation point along the three axes of the vehicle coordinate system, and an excitation force is applied to the second excitation point along the normal direction of the chassis plane. This includes: The intersection of the A-pillar of the vehicle body and the chassis plane is selected as the first excitation point. Excitation forces in the X, Y and Z directions of the vehicle coordinate system are applied to the first excitation point. The intersection of the extension line of the C-pillar of the vehicle body and the chassis is selected as the second excitation point. Excitation forces in the normal direction of the chassis plane are applied to the second excitation point. In a static state, the exciter is installed at the first excitation point and the second excitation point respectively for modal testing. Within a predetermined frequency range, a predetermined number of excitation forces are triggered by a random excitation signal in each excitation direction to obtain the various modes of the vehicle body.

6. The method for optimizing road noise performance of a vehicle body according to claim 5, characterized in that, In the modal test, the frequency response function curve and the coherence function curve are checked to ensure that the peak value of the frequency response function meets the set requirements and that the coherence function is not lower than the predetermined value at the resonance peak.

7. The method for optimizing road noise performance of a vehicle body according to claim 5, characterized in that, The obtained vehicle body modes include: The frequency response function of the vehicle body within a predetermined frequency range is obtained, and the least squares complex frequency domain method is used to identify the various modes of the vehicle body.

8. A road noise performance optimization system for a vehicle body, characterized in that, include: Create a module to build the vehicle's geometric model; The setting module is used to set an excitation source on the road surface and conduct a pass test on the vehicle using the excitation source to obtain the time-domain vibration signal generated at each detection point on the vehicle. The working deformation analysis module is used to obtain the results of the working deformation analysis of the vehicle based on the time-domain vibration signal, using a specified position on the vehicle geometric model as a phase reference point. The testing module is used to select a first excitation point and a second excitation point from the vehicle geometric model, and in a static state, to perform modal excitation on the vehicle geometric model through a vibrator to obtain the various modes of the vehicle body. In the modal excitation, an excitation force along the three axes of the vehicle coordinate system is applied to the first excitation point, and an excitation force along the normal direction of the chassis plane is applied to the second excitation point. The optimization module is used to identify the mode order that contributes the most to the vibration in the working deformation analysis from the various modes of the vehicle body, based on the results of the working deformation analysis, and to perform structural optimization on the corresponding mode of the vehicle body based on the mode order that contributes the most to the vibration.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the road noise performance optimization method for the vehicle body according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the road noise performance optimization method for the vehicle body according to any one of claims 1-7.

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