Whole vehicle acoustic vibration sensitivity detection device and detection method
By applying torque excitation in the opposite direction at the wheel center and collecting acoustic and vibration responses, the problem of difficulty in detecting the rotation torque excitation of the wheel center to the vehicle body in the prior art is solved, and efficient and accurate sound and vibration sensitivity detection is achieved, improving The whole vehicle's vibration noise and comfort.
Patent Information
- Application Number
- CN202411361341.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2024-12-20
AI Technical Summary
The prior art is difficult to efficiently and accurately detect the acoustic and vibration sensitivity of the wheel center rotation torque excitation to the vehicle body, which makes it difficult to solve the problem of vibration noise in the entire vehicle.
A vehicle sound and vibration sensitivity detection device is designed, including tooling, excitation module and detector. By applying torque excitation in the opposite direction at the wheel center, and using digital equipment to collect time-domain sound and vibration response, the acoustic and vibration sensitivity is calculated. The excitation module consists of a signal generator, a positive phase amplifier, an inverting amplifier, a first oscillator and a second oscillator, and torque excitation in the X-, Y- or Z-direction is achieved by adjusting the direction of the excitation force.
It realizes efficient and accurate detection of the acoustic and vibration sensitivity of each position of the vehicle body under the rotation torque excitation of the wheel center, and improves the vibration noise level and comfort of the entire vehicle.
Smart Images
Figure CN119164480A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of vehicle engineering, and in particular to a whole vehicle acoustic vibration sensitivity detection device and a detection method. Background Art
[0002] When the vehicle is driving, the road excitation generates torque on the wheel center. Under a certain torque load excitation, the wheel center will transmit the vibration into the vehicle and generate road noise. Therefore, the acoustic sensitivity of the vehicle structure to the excitation at the wheel center will directly affect the vibration and noise level and comfort level of the vehicle. It is an important indicator for evaluating the NVH (Noise, Vibration, Harshness) design level of the vehicle. If the design is not matched properly, it will cause vibration and noise problems of the whole vehicle. It is particularly important in the process of vehicle design matching.
[0003] At present, in the field of low-frequency road noise testing of whole vehicles, the vibration and noise response detection from the wheel center to the body response end mainly adopts two methods: simulation and testing. However, high-precision simulation requires a comprehensive study of the suspension / body vibration characteristics. Modeling involves complex components, many parameters, complex boundary conditions, a long modeling cycle, and requires benchmarking and verification of test data, making it difficult to ensure modeling accuracy. In the current modal testing research of tire suspension and other systems in the whole vehicle state, the test method for the acoustic vibration sensitivity of the wheel translation direction excitation to the body response point is relatively mature, but there is no efficient and high-precision detection system and method for the acoustic vibration sensitivity of the wheel center rotation torque excitation to the body attachment point and response point.
[0004] Therefore, it is necessary to provide a whole vehicle acoustic vibration sensitivity detection device and detection method to improve the above-mentioned problems. Summary of the invention
[0005] The purpose of the present invention is to provide a whole vehicle acoustic vibration sensitivity detection device and detection method, so as to improve the problem that the prior art is difficult to detect the acoustic vibration sensitivity of the vehicle body attachment points and response points under different directions of torque excitation at the wheel center.
[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a whole vehicle acoustic vibration sensitivity detection device, which includes a tooling, an excitation module, a detector and a data acquisition device.
[0007] Among them, the tooling is fixed on the wheel of the vehicle to be tested around the wheel center; the excitation module is used to apply excitation forces in opposite directions at the symmetrical positions of the tooling with respect to the wheel center, so as to apply torque excitation at the wheel center; the detector is used to collect the time domain acoustic vibration response at the target position of the vehicle; and the data acquisition equipment is respectively communicated with the excitation module and the detector.
[0008] In an example of the present invention, the excitation module includes a signal generator, a positive amplifier, an inverting amplifier, a first exciter and a second exciter, the positive amplifier and the inverting amplifier are communicatively connected to the signal generator, the first exciter is communicatively connected to the positive amplifier, the second exciter is communicatively connected to the inverting amplifier, the first exciter applies a first excitation force to the tooling, and the second exciter applies a second excitation force to the tooling; the combined force of the first excitation force and the second excitation force generates torque excitation at the wheel center.
[0009] In an example of the present invention, the first excitation force and the second excitation force are applied to the tooling symmetrically about the wheel center, the first excitation force and the second excitation force are opposite in real time, and the ratio of the first excitation force to the second excitation force is 0.95-1.05.
[0010] In an example of the present invention, a first rod is provided on the first exciter, and the first exciter applies the first excitation force to the tooling through the first rod; a second rod is provided on the second exciter, and the second exciter applies the second excitation force to the tooling through the second rod.
[0011] In an example of the present invention, a first force sensor is disposed on the top of the first rod body, and a second force sensor is disposed on the top of the second rod body. The first force sensor and the second force sensor are communicatively connected to the data acquisition device.
[0012] In an example of the present invention, the excitation module applies torque excitation in the X direction, Y direction or Z direction at the wheel center by adjusting the direction of action of the excitation force.
[0013] In an example of the present invention, the vehicle target position includes the attachment points between the body structure modules on the vehicle to be tested and the response points of the vibration inside the vehicle.
[0014] The present invention also provides a whole vehicle acoustic vibration sensitivity detection method, which is implemented using the whole vehicle acoustic vibration sensitivity detection device described in any of the above examples, and the whole vehicle acoustic vibration sensitivity detection method includes:
[0015] Installing the tooling on the wheel of the vehicle to be tested, wherein the tooling is arranged around the wheel center;
[0016] Using an excitation module to apply excitation forces in opposite directions at symmetrical positions on the tooling about the wheel center, so as to apply torque excitation at the wheel center;
[0017] The detector is arranged at the vehicle target position on the vehicle to be tested, and the time domain acoustic vibration response at the vehicle target position is collected by using the detector;
[0018] The data acquisition device obtains the time-domain torque excitation applied at the wheel center and the time-domain acoustic-vibration response at each of the vehicle target positions, and obtains the acoustic-vibration sensitivity of the vehicle target position under the wheel center torque excitation based on the time-domain torque excitation and the time-domain acoustic-vibration response, wherein the acoustic-vibration sensitivity is a transfer function between the time-domain acoustic-vibration response and the time-domain torque excitation.
[0019] In an example of the present invention, a data acquisition device acquires a time-domain torque excitation applied at the wheel center and a time-domain acoustic vibration response signal at each of the vehicle target positions, and acquires the acoustic vibration sensitivity of the vehicle target position under the wheel center torque excitation based on the time-domain torque excitation and the time-domain acoustic vibration response signal, including:
[0020] The data acquisition device acquires the excitation force applied by the excitation module on the tooling in real time, and acquires the time-domain torque excitation applied by the excitation module at the wheel center based on the excitation force and the distance between the force-bearing position of the tooling and the wheel center; the data acquisition device acquires the time-domain acoustic-vibration response at the target position of the vehicle; the data acquisition device acquires the acoustic-vibration sensitivity at the target position of the vehicle based on the time-domain torque excitation and the time-domain acoustic-vibration response.
[0021] In an example of the present invention, using an excitation module to apply excitation forces in opposite directions at symmetrical positions on the tooling about the wheel center to apply torque excitation at the wheel center includes:
[0022] The excitation module generates an excitation signal, and performs positive phase modulation and negative phase modulation on the excitation signal respectively to obtain a positive phase excitation signal and a negative phase excitation signal; the amplitudes of the positive phase excitation signal and the negative phase excitation signal are equal and the phases are opposite; the excitation module includes a first exciter and a second exciter, and the excitation module uses the positive phase excitation signal to excite the first exciter to apply a first excitation force to the tooling, and uses the negative phase excitation signal to excite the second exciter to apply a second excitation force to the tooling; wherein the combined force of the first excitation force and the second excitation force generates a torque excitation at the wheel center.
[0023] The above-mentioned whole vehicle acoustic vibration sensitivity detection device and detection method use an excitation module to apply excitation forces in opposite directions at the central symmetrical positions of the wheel center on the tooling, thereby realizing the application of pure torque excitation in different axial directions at the wheel center. At the same time, a detector is set at the target position of the vehicle to be tested to collect the vibration response of the whole vehicle at different positions under the wheel center torque excitation, and then detect the acoustic vibration sensitivity of the wheel center rotation torque excitation to various positions of the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:
[0025] Figure 1 Shown is a structural block diagram of a whole vehicle acoustic vibration sensitivity detection device in one embodiment of the present invention;
[0026] Figure 2 It is a schematic diagram showing the arrangement structure of the excitation module and the tooling on the wheel in one embodiment of the present invention;
[0027] Figure 3 Shown is a schematic flow chart of a method for detecting the acoustic vibration sensitivity of a whole vehicle in one embodiment of the present invention;
[0028] Figure 4 It is a schematic diagram of the process of step S2 in one embodiment of the present invention;
[0029] Figure 5 It is a schematic diagram of the process of step S4 in one embodiment of the present invention;
[0030] Figure 6 The display shows the acoustic vibration sensitivity test result of the interior of the vehicle to be tested under wheel center torque excitation in one embodiment of the present invention.
[0031] Component number description
[0032] 100, tooling; 110, force-bearing structure; 200, excitation module; 210, signal generator; 220, positive-phase amplifier; 230, inverting amplifier; 240, first exciter; 241, first rod; 242, first force sensor; 250, second exciter; 251, second rod; 252, second force sensor; 300, detector; 400, data acquisition equipment; 500, vehicle to be tested; 510, wheel. DETAILED DESCRIPTION
[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0034] See also Figures 1 to 6 It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.
[0035] See also Figure 1 The present invention provides a whole vehicle acoustic vibration sensitivity detection device, which includes a tool 100, an excitation module 200, a detector 300 and a data acquisition device 400.
[0036] like Figure 1 and Figure 2 As shown, the tooling 100 is fixed on the wheel 510 of the vehicle 500 to be tested. The tooling 100 is installed and fixed on the side of the wheel 510 facing outward, and a gap is left between the tooling 100 and the wheel 510 to facilitate the placement of the excitation end of the excitation module 200. The tooling 100 is arranged around the wheel center of the installed vehicle to provide force application points symmetrical about the center of the wheel center. It should be noted that the fixed connection method between the tooling 100 and the wheel 510 is not limited, such as welding, bolt connection, mortise and tenon connection or interference fit, etc. In some embodiments, the tooling 100 and the wheel 510 are fixedly connected by multiple bolts.
[0037] like Figure 1 and Figure 2 As shown, the excitation module 200 is used to apply excitation forces in opposite directions in real time at the central symmetrical position of the tooling 100 about the wheel center, so as to achieve pure torque excitation at the wheel center. In the present invention, the excitation forces in opposite directions act on the tooling 100 with the same frequency, the same force value and opposite action directions, so as to ensure that the resultant force of the excitation module 200 acting on the tooling 100 approaches zero, thereby achieving pure torque excitation to the wheel center through the tooling 100. Among them, the torque excitation applied to the wheel center is M(t)=F(t)×L, F(t) is the excitation force, and L is the distance between the action position of the excitation force on the tooling 100 and the wheel center.
[0038] It should be noted that the excitation module 200 can achieve the application of torque excitation in different axial directions at the wheel center by adjusting the direction of the excitation force applied to the tooling 100, for example, applying torque excitation in the X direction, Y direction or Z direction at the wheel center, as shown in the following example. Figure 2 As shown, the excitation module 200 applies excitation forces in opposite directions along the X-axis at symmetrical positions on both sides of the tooling 100, thereby forming a Y-axis torque at the wheel center; for another example, the excitation module 200 applies excitation forces in opposite directions along the Y-axis at symmetrical positions on both sides of the tooling 100, thereby forming a Z-axis torque at the wheel center; for another example, the excitation module 200 applies excitation forces in opposite directions along the Z-axis at symmetrical positions on both sides of the tooling 100, thereby forming an X-axis torque at the wheel center.
[0039] like Figure 1 As described, the detector 300 is set at a preset vehicle target position on the vehicle 500 to be tested. The detector 300 monitors the vibration response at the vehicle target position in real time, thereby collecting and acquiring the time-domain acoustic vibration response at the vehicle target position. The time-domain acoustic vibration response includes the time-domain vibration response at the attachment point on the vehicle body and the time-domain noise response at the response point inside the vehicle. The data acquisition device 400 is connected to the excitation module 200 and the detector 300 for communication. The data acquisition device 400 obtains the excitation force from the excitation module 200. The data acquisition device 400 obtains the torque excitation M(t) applied at the wheel center based on the excitation force F(t) and the distance L between the action position of the excitation force on the tooling 100 and the wheel center. The data acquisition device 400 obtains the time-domain acoustic vibration response Y(t) of the vehicle target position from the detector 300. The data acquisition device 400 obtains the acoustic-vibration sensitivity of the target position of the vehicle under the wheel center torque excitation of different excitation frequencies based on the torque excitation M(t) applied at the wheel center and the time domain acoustic-vibration response Y(t) at the target position of the vehicle. The acoustic-vibration sensitivity includes the torque-vibration sensitivity at the vehicle body attachment point and the torque-acoustic sensitivity at the response point inside the vehicle.
[0040] like Figure 1 and Figure 2As shown, in some embodiments, the excitation module 200 includes a signal generator 210, a positive phase amplifier 220, an inverting amplifier 230, a first exciter 240, and a second exciter 250. The signal generator 210 generates an excitation signal (such as a random burst signal), and the positive phase amplifier 220 and the inverting amplifier 230 are connected to the signal generator 210 for communication. The positive phase amplifier 220 receives the excitation signal and amplifies the positive phase of the excitation signal (i.e., the output signal is amplified with a 0° phase difference relative to the input signal) to generate a positive phase excitation signal; the inverting amplifier 230 receives the excitation signal and amplifies the inverting phase of the excitation signal (i.e., the output signal is amplified with a 180° phase difference relative to the input signal) to generate an inverted phase excitation signal; wherein the positive phase amplifier 220 and the inverting amplifier 230 have the same amplification factor for the excitation signal, so that the amplitudes of the positive phase excitation signal and the inverted phase excitation signal are the same and the phases are opposite. The first exciter 240 is connected to the positive phase amplifier 220 for communication. The first exciter 240 applies a first excitation force to the tooling 100 based on the positive phase excitation signal, and the second exciter 250 applies a second excitation force to the tooling 100 based on the anti-phase excitation signal. The first excitation force and the second excitation force are applied to the tooling 100 symmetrically about the wheel center. The first excitation force and the second excitation force have the same action frequency, the same force value and opposite action direction on the tooling 100 to ensure that the first excitation force and the second excitation force acting on the tooling 100 are reversed in real time, so that the resultant force of the first excitation force and the second excitation force on the tooling 100 can generate pure torque excitation at the wheel center. It should be noted that the force values of the first excitation force and the second excitation force applied to the tooling 100 by the excitation module 200 may not be completely equal, and a certain error between the first excitation force and the second excitation force can be allowed. In some embodiments, the ratio of the first excitation force to the second excitation force may be 0.95-1.05, for example, 0.95, 0.97, 1, 1.02 or 1.05.
[0041] like Figure 2 As shown, in some embodiments, the first exciter 240 is provided with a first rod 241, and the first exciter 240 drives the first rod 241 to act vertically on the tooling 100 according to the frequency of the positive phase excitation signal, thereby applying a first excitation force to the tooling 100 through the first rod 241; the second exciter 250 is provided with a second rod 251, and the second exciter 250 drives the second rod 251 to act vertically on the tooling 100 according to the frequency of the anti-phase excitation signal, thereby applying a second excitation force to the tooling 100 through the first rod 251. By changing the force position and force direction of the first rod 241 and the second rod 251 relative to the tooling 100, it is possible to achieve pure torque excitation in different axial directions (such as X direction, Y direction or Z direction) at the wheel center of the wheel 510.
[0042] like Figure 2 As shown, in some embodiments, a first force sensor 242 is disposed on the top of the first rod 241, and a second force sensor 252 is disposed on the top of the second rod 251. The first force sensor 242 and the second force sensor 252 are communicatively connected to the data acquisition device 400. The first force sensor 242 collects the first excitation force applied by the first rod 241 to the tooling 100 in real time, and sends the collected first excitation force to the data acquisition device 400; the second force sensor 252 collects the second excitation force applied by the second rod 251 to the tooling 100 in real time, and sends the collected second excitation force to the data acquisition device 400.
[0043] like Figure 2 As shown, in some embodiments, a plurality of force-bearing structures 110 are provided on the tooling 100. The force-bearing structures 110 are protrudingly arranged on the circumferential periphery of the tooling 100 surrounding the wheel center. The force-bearing structures 110 can provide force-bearing surfaces for receiving the action of the first rod body 241 in multiple directions, so that the first exciter 240 and the second exciter 250 can apply relative forces to the tooling 100 in different axial directions.
[0044] In addition, the vehicle target position may be any designated detection position on the vehicle. For example, in some embodiments, the vehicle target position preset on the vehicle to be tested 500 may include the attachment points between the vehicle body structure modules and the response points in the vehicle that generate noise in response to vibration. For example, the attachment points may be the attachment points between the wheel 510 and the shock absorber, the attachment points between the shock absorber and the suspension, the attachment points between the suspension and the vehicle body, the attachment points between the subframe and the vehicle body, the attachment points on the vehicle body structure (such as the attachment points between the roof, the floor, the door and the vehicle body), etc.; the response points may be the floor, steering wheel, seat, door, window in the vehicle, and the appropriate positions where the driver and passengers sit in the vehicle.
[0045] See also Figure 3 The present invention also provides a whole vehicle acoustic vibration sensitivity detection method, the whole vehicle acoustic vibration sensitivity detection method is implemented using the whole vehicle acoustic vibration sensitivity detection device described in any of the above embodiments, and the whole vehicle acoustic vibration sensitivity detection method comprises the following steps:
[0046] S1, installing the tool 100 on the wheel 510 of the vehicle 500 to be tested, and the tool 100 is arranged around the wheel center of the wheel 510;
[0047] like Figure 2As shown, in step S1, the tool 100 is installed and fixed on the side of the wheel 510 facing the outside of the vehicle, and the tool 100 is arranged around the wheel center of the wheel 510 to provide force application points symmetrical about the center of the wheel center. The method of fixing the tool 100 on the wheel 510 in step S1 can be welding, bolt connection, mortise and tenon connection or interference fit.
[0048] Next, step S2 is performed, using the excitation module 200 to apply excitation forces in opposite directions at symmetrical positions about the wheel center on the tooling 100, so as to apply torque excitation at the wheel center;
[0049] In step S2, the excitation module 200 applies excitation forces in opposite directions to the tooling 100 at symmetrical positions about the wheel center in real time, so that the resultant force on the tooling 100 is 0, so as to apply pure torque excitation at the wheel center. At the same time, the excitation module 200 adjusts the frequency of applying excitation forces in opposite directions on the tooling 100, so as to achieve pure torque excitation of different frequencies at the wheel center.
[0050] Furthermore, in step S2, by adjusting the excitation module 200 to apply excitation forces in opposite directions to the tooling 100 at symmetrical positions, pure torque excitation in different axial directions can be applied at the wheel center. For example, torque excitation in the X direction, Y direction or Z direction is applied at the wheel center. Figure 2 As shown, the excitation module 200 applies excitation forces in opposite directions along the X-axis at symmetrical positions on both sides of the tooling 100, thereby forming a Y-axis torque at the wheel center; for another example, the excitation module 200 applies excitation forces in opposite directions along the Y-axis at symmetrical positions on both sides of the tooling 100, thereby forming a Z-axis torque at the wheel center; for another example, the excitation module 200 applies excitation forces in opposite directions along the Z-axis at symmetrical positions on both sides of the tooling 100, thereby forming an X-axis torque at the wheel center.
[0051] Specifically, Figure 4 As shown, in some embodiments, step S2 includes the following steps:
[0052] S21, the excitation module 200 generates an excitation signal, and performs positive phase modulation and anti-phase modulation on the excitation signal respectively to obtain a positive phase excitation signal and an anti-phase excitation signal; the positive phase excitation signal and the anti-phase excitation signal have equal amplitudes and opposite phases;
[0053] S22. The excitation module 200 includes a first exciter 240 and a second exciter 250. The excitation module 200 uses the positive phase excitation signal to excite the first exciter 240 to apply a first excitation force to the tooling 100, and applies a second excitation force to the tooling 100 through the second exciter 250; wherein the combined force of the first excitation force and the second excitation force generates a torque excitation at the wheel center.
[0054] like Figure 1 As shown, in this embodiment, the excitation module 200 includes a signal generator 210, a positive phase amplifier 220, an inverting amplifier 230, a first exciter 240 and a second exciter 250. In step S21 and step S22, the signal generator 210 generates an excitation signal, the positive phase amplifier 220 performs positive phase modulation on the excitation signal to generate a positive phase excitation signal, the inverting amplifier 230 performs inverting phase modulation on the excitation signal to generate an inverted phase excitation signal, the first exciter 240 applies a first excitation force to the tooling 100 under the excitation of the positive phase excitation signal, and the second exciter 250 applies a second excitation force to the tooling 100 under the excitation of the inverted phase excitation signal. The first excitation force and the second excitation force are applied to the tooling 100 symmetrically about the wheel center. Since the first excitation force and the second excitation force act on the tooling 100 in opposite directions in real time, pure torque excitation is applied to the wheel center under the combined force of the first excitation force and the second excitation force.
[0055] Next, execute step S3, set the detector 300 at the vehicle target position on the vehicle to be tested 500, and use the detector 300 to collect the vibration response at the vehicle target position in real time to obtain the time domain acoustic vibration response at the vehicle target position, and the time domain acoustic vibration response includes the time domain vibration response at the vehicle body attachment point and the time domain noise response at the response point inside the vehicle.
[0056] The vehicle target positions preset on the vehicle to be tested 500 include the attachment points between the body structure modules on the vehicle and the response points in the vehicle that generate noise in response to vibration.
[0057] Next, step S4 is executed, the data acquisition device 400 obtains the time-domain torque excitation applied at the wheel center and the time-domain acoustic-vibration response at each of the vehicle target positions, and obtains the acoustic-vibration sensitivity of the vehicle target position under the wheel center torque excitation based on the time-domain torque excitation and the time-domain acoustic-vibration response.
[0058] Specifically, Figure 5 As shown, step S4 includes the following steps:
[0059] S41, the data acquisition device 400 acquires the excitation force applied by the excitation module 200 on the tooling 100 in real time, and acquires the time domain torque excitation applied by the excitation module 200 at the wheel center based on the excitation force and the distance between the wheel center and the force-bearing position of the tooling 100;
[0060] In step S41, the data acquisition device 400 acquires the excitation force applied by the excitation module 200 on the tooling 100 in real time, wherein the data acquisition device 400 acquires the relationship between the force value and time of any one of the two reverse excitation forces, and thus acquires the excitation force F(t); then, based on the excitation force F(t) and the distance L between the wheel center and the force-bearing position of the tooling 100, the data acquisition device 400 acquires the time-domain torque excitation M(t) applied at the wheel center, and the time-domain torque excitation is M(t)=F(t)×L.
[0061] S42, the data acquisition device 400 obtains the time-domain acoustic vibration response at the target position of the vehicle; wherein the time-domain acoustic vibration response is represented by Y(t), and the time-domain acoustic vibration response is the relationship between the vibration amplitude and time at the target position of the vehicle.
[0062] S43. The data acquisition device 400 obtains the acoustic vibration sensitivity at the target position of the vehicle based on the time-domain torque excitation and the time-domain acoustic vibration response, where the acoustic vibration sensitivity is a transfer function between the time-domain acoustic vibration response and the time-domain torque excitation.
[0063] In step S43, the data acquisition device 400 performs Fourier transform on the time domain torque excitation M(t) and the time domain acoustic vibration response Y(t) to obtain the frequency domain torque excitation M(w) and the frequency domain vibration response Y(w); then, the data acquisition device 400 calculates the transfer function H(w) of the vibration response of the target position of the vehicle relative to the torque excitation at the wheel center based on the frequency domain torque excitation M(w) and the frequency domain vibration response Y(w). Figure 6 As shown in the figure, the transfer function H(w) can represent the acoustic-vibration sensitivity of the vehicle target position to torque excitations of different frequencies at the wheel center. The acoustic-vibration sensitivity includes the moment-vibration sensitivity at the vehicle body attachment point (i.e., moment-vibration transfer function) and the moment-acoustic sensitivity at the response point in the vehicle (i.e., moment-acceleration transfer function).
[0064] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.
Claims
1. A whole vehicle acoustic vibration sensitivity detection device, characterized in that: include: The tooling is fixed on the wheel of the vehicle to be tested around the wheel center; An excitation module, used for applying excitation forces in opposite directions at symmetrical positions of the tooling with respect to the wheel center, so as to apply torque excitation at the wheel center; A detector for collecting time-domain acoustic vibration response at a target position of the vehicle; The data acquisition device is communicatively connected with the excitation module and the detector respectively.
2. The whole vehicle acoustic vibration sensitivity detection device according to claim 1, characterized in that: The excitation module includes a signal generator, a positive phase amplifier, an inverting amplifier, a first exciter and a second exciter, the positive phase amplifier and the inverting amplifier are connected to the signal generator in communication, the first exciter is connected to the positive phase amplifier in communication, the second exciter is connected to the inverting amplifier in communication, the first exciter applies a first excitation force to the tooling, and the second exciter applies a second excitation force to the tooling; A combined force of the first excitation force and the second excitation force generates torque excitation at the wheel center.
3. The whole vehicle acoustic vibration sensitivity detection device according to claim 2, characterized in that: The first excitation force and the second excitation force are applied to the tooling symmetrically about the wheel center, the first excitation force and the second excitation force are opposite in real time, and the ratio of the first excitation force to the second excitation force is 0.95-1.
05.
4. The whole vehicle acoustic vibration sensitivity detection device according to claim 2, characterized in that: The first exciter is provided with a first rod, and the first exciter applies the first excitation force to the tooling through the first rod; the second exciter is provided with a second rod, and the second exciter applies the second excitation force to the tooling through the second rod.
5. The whole vehicle acoustic vibration sensitivity detection device according to claim 4, characterized in that: A first force sensor is disposed on the top of the first rod body, and a second force sensor is disposed on the top of the second rod body. The first force sensor and the second force sensor are communicatively connected with the data acquisition device.
6. The whole vehicle acoustic vibration sensitivity detection device according to claim 1, characterized in that: The excitation module applies torque excitation in the X direction, Y direction or Z direction at the wheel center by adjusting the action direction of the excitation force.
7. The whole vehicle acoustic vibration sensitivity detection device according to claim 1, characterized in that: The vehicle target position includes the attachment points between the body structure modules on the vehicle to be tested and the response points of the vibration inside the vehicle.
8. A method for detecting the acoustic vibration sensitivity of a whole vehicle, characterized in that: The whole vehicle acoustic vibration sensitivity detection device according to any one of claims 1 to 7 is used to implement a whole vehicle acoustic vibration sensitivity detection method, and the whole vehicle acoustic vibration sensitivity detection method comprises: Installing the tooling on the wheel of the vehicle to be tested, wherein the tooling is arranged around the wheel center; Using an excitation module to apply excitation forces in opposite directions at symmetrical positions on the tooling about the wheel center, so as to apply torque excitation at the wheel center; The detector is arranged at the vehicle target position on the vehicle to be tested, and the time domain acoustic vibration response at the vehicle target position is collected by using the detector; The data acquisition device obtains the time-domain torque excitation applied at the wheel center and the time-domain acoustic-vibration response at each of the vehicle target positions, and obtains the acoustic-vibration sensitivity of the vehicle target position under the wheel center torque excitation based on the time-domain torque excitation and the time-domain acoustic-vibration response, wherein the acoustic-vibration sensitivity is a transfer function between the time-domain acoustic-vibration response and the time-domain torque excitation.
9. The whole vehicle acoustic vibration sensitivity detection method according to claim 8, characterized in that: The data acquisition device obtains the time-domain torque excitation applied at the wheel center and the time-domain acoustic vibration response signal at each of the vehicle target positions, and obtains the acoustic vibration sensitivity of the vehicle target position under the wheel center torque excitation based on the time-domain torque excitation and the time-domain acoustic vibration response signal, including: The data acquisition device acquires the excitation force applied by the excitation module on the tooling in real time, and acquires the time domain torque excitation applied by the excitation module at the wheel center based on the excitation force and the distance between the force-bearing position of the tooling and the wheel center; The data acquisition device acquires the time domain acoustic vibration response at the target position of the vehicle; The data acquisition device obtains the acoustic vibration sensitivity at the target position of the vehicle based on the time-domain torque excitation and the time-domain acoustic vibration response.
10. The whole vehicle acoustic vibration sensitivity detection method according to claim 8, characterized in that: Using an excitation module to apply excitation forces in opposite directions at symmetrical positions on the tooling about the wheel center to apply torque excitation at the wheel center, including: The excitation module generates an excitation signal, and performs positive phase modulation and negative phase modulation on the excitation signal respectively to obtain a positive phase excitation signal and a negative phase excitation signal; the positive phase excitation signal and the negative phase excitation signal have equal amplitudes and opposite phases; The excitation module includes a first exciter and a second exciter. The excitation module uses the positive phase excitation signal to excite the first exciter to apply a first excitation force to the tooling, and uses the negative phase excitation signal to excite the second exciter to apply a second excitation force to the tooling; wherein the combined force of the first excitation force and the second excitation force generates a torque excitation at the wheel center.