Evaluation method and device for vibration noise of automotive suspension, vehicle and storage medium

Abstract

The invention relates to the technical field of vehicles, in particular to an automotive suspension vibration noise evaluation method and device, a vehicle and a storage medium, and the method comprises the steps: respectively testing a suspension test bench and a suspension test bench after a to-be-evaluated vehicle suspension is assembled; obtaining a transfer function of the suspension test bench at each first detection point and a transfer function of the suspension test bench assembled with the to-be-evaluated vehicle suspension at each second detection point; determining a transfer function of the to-be-evaluated vehicle suspension according to the transfer function of each second detection point and the transfer function of each first detection point; and obtaining a vibration noise evaluation result of the to-be-evaluated vehicle suspension according to the transfer function of the to-be-evaluated vehicle suspension, the tire load of the at least one vehicle model and the vehicle body transfer function of the at least one vehicle model. Therefore, the problems that the transfer function of the automobile suspension cannot be obtained and the vibration noise of the suspension module in various automobile types cannot be analyzed in the prior art are solved, and the transfer characteristics of the suspension can be reflected.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method, device, vehicle and storage medium for evaluating automobile suspension vibration noise. Background Art

[0002] When a car is driving, the vibration generated by the interaction between the road surface and the tires is usually transmitted through the suspension and causes sheet metal response at the body end, resulting in vibration and noise inside the car, seriously affecting the user experience.

[0003] As the core component of vehicle driving and vibration filtering, the vibration transfer characteristics of the suspension can be characterized by the transfer function. It is a feasible method to establish the evaluation index and acquisition method of the suspension transfer function and use the transfer function to evaluate the performance of the suspension module in different vehicle models.

[0004] There are two methods for evaluating suspension in related technologies. The first method is to fix the vehicle chassis through a customized test bench, simulate the actual vehicle operation, and input the test data into the finite element model to obtain the in-vehicle noise. The other method is to use an excitation signal to virtually simulate the vehicle suspension model, calculate the load transfer function, determine the load transfer path of the vehicle suspension assembly, and analyze the load transfer path.

[0005] However, in one method, the load used to calculate the interior noise is closely related to the drum surface and the tire, and can only be used as a relative comparison of the suspension characteristics under the same conditions. The calculated interior noise is quite different from the interior noise of the vehicle during actual road driving, and the suspension load is closely related to different tire and road conditions, and even body-end constraints, making it difficult to evaluate the characteristics of the suspension itself. The second method has poor calculation accuracy due to the large number of nonlinear factors in the vehicle model. Summary of the invention

[0006] The present application provides a method, device, vehicle and storage medium for evaluating the vibration and noise of an automobile suspension, so as to solve the problem that the related technology cannot obtain the transfer function of the automobile suspension and cannot analyze the vibration and noise of the suspension module in various vehicle models. The present application can ensure that the suspension is consistent with the preload and installation posture of the actual vehicle during the test, and can simulate the actual use environment of multiple vehicle models; the transfer function of the suspension is independent of the tire and vehicle body constraints, and only reflects the transfer characteristics of the suspension itself, and can obtain the characterization parameters for independent evaluation of the suspension module.

[0007] The first embodiment of the present application provides a method for evaluating the vibration noise of an automobile suspension, comprising the following steps:

[0008] Testing the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated respectively, and obtaining the transfer function of the suspension test bench at each first detection point and the transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point;

[0009] Determining the transfer function of the suspension of the vehicle to be evaluated according to the transfer function of each second detection point and the transfer function of each first detection point;

[0010] The tire load and body transfer function of at least one vehicle type equipped with the vehicle suspension to be evaluated are obtained, and a vibration and noise evaluation result of the vehicle suspension to be evaluated is obtained according to the transfer function of the vehicle suspension to be evaluated, the tire load of the at least one vehicle type, and the body transfer function of the at least one vehicle type.

[0011] Optionally, in some embodiments, obtaining the vibration and noise evaluation result of the suspension of the vehicle to be evaluated according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model, and the body transfer function of the at least one vehicle model comprises:

[0012] Determining the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model and the body transfer function of the at least one vehicle model;

[0013] Obtaining the vibration and noise range of each vehicle model, and determining whether the vibration and noise of at least one vehicle model is within the vibration and noise range of the corresponding vehicle model;

[0014] If the vibration noise of all vehicle models is within the vibration noise range of the corresponding vehicle model, the evaluation result is qualified, otherwise the evaluation result is unqualified.

[0015] Optionally, in some embodiments, determining the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model and the body transfer function of the at least one vehicle model comprises:

[0016] Based on a preset vibration noise calculation formula, the vibration noise of at least one vehicle model is determined according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model, and the body transfer function of the at least one vehicle model, wherein the preset vibration noise calculation formula is:

[0017]

[0018] in, is the vibration noise, is the tire load, is the dynamic stiffness of the tire, is the transfer function of the first test point, is the transfer function from the second test point to the first test point, is the transfer function of the second test point, is the stiffness value of the bushing, is the dynamic stiffness of the third test point, is the transfer function from the fourth test point to the third test point.

[0019] Optionally, in some embodiments, obtaining at least one tire load comprises:

[0020] Obtain at least one tire to be tested,

[0021] Frequently testing the at least one tire to be tested to obtain acceleration data of each third detection point, and calculating a transfer function of each third detection point;

[0022] Based on a preset load merging formula, the tire load of the tire to be tested is obtained according to the acceleration data of each third detection point and the transfer function of each third detection point, wherein the preset load merging formula is:

[0023]

[0024] in, is the tire load, is the transfer function of the third detection point i, is the acceleration data of the third detection point i, and i is the number of the third detection point.

[0025] Optionally, in some embodiments, before testing the suspension test bench after assembling the vehicle suspension to be evaluated, the method further includes:

[0026] Determining the mass of the counterweight according to the half-load weight of the suspension of the vehicle to be evaluated and the mass of the test bench body of the suspension test bench;

[0027] A counterweight module is determined based on the counterweight mass, and the counterweight module is installed above the suspension test bench after the suspension of the vehicle to be evaluated is assembled.

[0028] The second aspect of the present application provides a device for evaluating automobile suspension vibration noise, comprising:

[0029] A testing module, used to test the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated, respectively, to obtain a transfer function of the suspension test bench at each first detection point and a transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point;

[0030] A determination module, configured to determine the transfer function of the suspension of the vehicle to be evaluated according to the transfer function of each second detection point and the transfer function of each first detection point;

[0031] An evaluation module is used to obtain the tire load and body transfer function of at least one vehicle model equipped with the vehicle suspension to be evaluated, and obtain a vibration and noise evaluation result of the vehicle suspension to be evaluated based on the transfer function of the vehicle suspension to be evaluated, the tire load of the at least one vehicle model and the body transfer function of the at least one vehicle model.

[0032] Optionally, in some embodiments, the determining module includes:

[0033] A first determination unit, configured to determine the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model and the body transfer function of the at least one vehicle model;

[0034] A first acquisition unit is used to acquire the vibration and noise range of each vehicle model, and determine whether the vibration and noise of at least one vehicle model is in the vibration and noise range of the corresponding vehicle model;

[0035] The evaluation unit determines that the evaluation result is qualified when the vibration noise of all vehicle models is within the vibration noise range of the corresponding vehicle model; otherwise, the evaluation result is unqualified.

[0036] Optionally, in some embodiments, determining the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model and the body transfer function of the at least one vehicle model comprises:

[0037] Based on a preset vibration noise calculation formula, the vibration noise of at least one vehicle model is determined according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model, and the body transfer function of the at least one vehicle model, wherein the preset vibration noise calculation formula is:

[0038]

[0039] in, is the vibration noise, is the tire load, is the dynamic stiffness of the tire, is the transfer function of the first test point, is the transfer function from the second test point to the first test point, is the transfer function of the second test point, is the stiffness value of the bushing, is the dynamic stiffness of the third test point, is the transfer function from the fourth test point to the third test point.

[0040] Optionally, in some embodiments, the evaluation module includes:

[0041] A second acquisition unit is used to acquire at least one tire to be tested.

[0042] a calculation unit, configured to frequently test the at least one tire to be tested to obtain acceleration data of each third detection point, and calculate a transfer function of each third detection point;

[0043] A generating unit is used to obtain the tire load of the tire to be tested according to the acceleration data of each third detection point and the transfer function of each third detection point based on a preset load merging formula, wherein the preset load merging formula is:

[0044]

[0045] in, is the tire load, is the transfer function of the third detection point i, is the acceleration data of the third detection point i, and i is the number of the third detection point.

[0046] Optionally, in some embodiments, before testing the suspension test bench after assembling the vehicle suspension to be evaluated, the testing module further includes:

[0047] A second determination unit is used to determine the mass of the counterweight according to the half-loaded vehicle weight of the suspension of the vehicle to be evaluated and the mass of the test bench body of the suspension test bench;

[0048] The counterweight unit is used to determine the counterweight module based on the counterweight mass, and install the counterweight module above the suspension test bench after assembling the suspension of the vehicle to be evaluated.

[0049] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for evaluating automobile suspension vibration noise as described in the above embodiment.

[0050] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the method for evaluating the vibration noise of a vehicle suspension as described in the above embodiment.

[0051] Thus, by testing the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated respectively, the transfer function of the suspension test bench at each first detection point and the transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point are obtained, and the transfer function of the suspension of the vehicle to be evaluated is determined according to the transfer function of each second detection point and the transfer function of each first detection point, and the tire load and body transfer function of at least one vehicle model equipped with the suspension of the vehicle to be evaluated are obtained, and the vibration and noise evaluation result of the suspension of the vehicle to be evaluated is obtained according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model. Thus, the problem that the related technology cannot obtain the transfer function of the automobile suspension and cannot analyze the vibration and noise of the suspension module in various vehicle models is solved. The present application can ensure that the preload and installation posture of the suspension in the test and the actual vehicle are consistent, and can simulate the actual use environment of multiple vehicle models; the transfer function of the suspension is independent of the tire and body constraints, and only reflects the transfer characteristics of the suspension itself, and the characterization parameters of the independent evaluation of the suspension module can be obtained.

[0052] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0054] Figure 1 A flowchart of a method for evaluating automobile suspension vibration noise according to an embodiment of the present application;

[0055] Figure 2 A schematic diagram of a test bench body of a suspension test bench provided according to an embodiment of the present application;

[0056] Figure 3 A schematic diagram of a mounting bracket of a suspension test bench provided according to an embodiment of the present application;

[0057] Figure 4 A schematic diagram of a suspension test bench provided according to an embodiment of the present application;

[0058] Figure 5 A schematic diagram of a suspension test bench after assembling a vehicle suspension to be evaluated according to an embodiment of the present application;

[0059] Figure 6 A schematic diagram of the reduction of the wheel center periphery into the hub center according to an embodiment of the present application;

[0060] Figure 7A schematic diagram of a vehicle suspension to be evaluated and detection points on a suspension test bench provided according to an embodiment of the present application;

[0061] Figure 8 A schematic diagram of a transfer function of each first detection point provided according to an embodiment of the present application;

[0062] Fig. 9 A schematic diagram of a transfer function of each second detection point provided according to an embodiment of the present application;

[0063] Fig.10 A schematic diagram of a calculation principle of a transfer function of a vehicle suspension to be evaluated according to an embodiment of the present application;

[0064] Fig.11 A flowchart of a method for evaluating automobile suspension vibration noise according to an embodiment of the present application;

[0065] Fig.12 A schematic diagram of a calculation principle of vibration noise provided according to an embodiment of the present application;

[0066] Fig.13 A block diagram of a device for evaluating automobile suspension vibration noise provided according to an embodiment of the present application;

[0067] Fig.14 It is a schematic diagram of the structure of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0068] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0069] The following describes the evaluation method, device, vehicle and storage medium of the automobile suspension vibration noise of the embodiment of the present application with reference to the accompanying drawings. In view of the problem that the related art mentioned in the above background technology cannot obtain the transfer function of the automobile suspension and cannot analyze the vibration noise of the suspension module in various vehicle models, the present application provides an evaluation method for automobile suspension vibration noise, in which the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated are tested respectively to obtain the transfer function of the suspension test bench at each first detection point and the transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point, and the transfer function of the suspension of the vehicle to be evaluated is determined according to the transfer function of each second detection point and the transfer function of each first detection point, and the tire load and body transfer function of at least one vehicle model equipped with the suspension of the vehicle to be evaluated are obtained, and the vibration noise evaluation result of the suspension of the vehicle to be evaluated is obtained according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model. As a result, the problem that the related technology cannot obtain the transfer function of the automobile suspension and cannot analyze the vibration and noise of the suspension module in various vehicle models is solved. The present application can ensure that the preload and installation posture of the suspension in the test and the actual vehicle are consistent, and can simulate the actual use environment of multiple vehicle models; the transfer function of the suspension is independent of the tire and body constraints, and only reflects the transfer characteristics of the suspension itself, and can obtain the characterization parameters for independent evaluation of the suspension module.

[0070] Specifically, Figure 1 A schematic flow chart of a method for evaluating automobile suspension vibration noise provided in an embodiment of the present application.

[0071] like Figure 1 As shown, the evaluation method of automobile suspension vibration noise includes the following steps:

[0072] In step S101, the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated are tested respectively to obtain the transfer function of the suspension test bench at each first detection point and the transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point.

[0073] Specifically, before conducting a test, the embodiment of the present application can pre-establish a suspension test bench for automobile suspension installation and posture adjustment, wherein the suspension test bench includes a bench body and a mounting bracket.

[0074] like Figure 2As shown in the figure, the test bench body is the basic structure of the suspension test bench, which needs to be able to withstand a vertical load of no less than 1300KG, and has no obvious elastic mode in the range of 0-350Hz. The suspension installation point stiffness is >30000N / mm to ensure that the test bench is a rigid and non-deformable body relative to the suspension within the inspection frequency range. The test bench body can realize the installation of different suspension types (such as rear torsion beam, rear four-link, rear five-link suspension, etc.). The mounting brackets processed according to the suspension of the vehicle to be evaluated can be flexibly assembled through the flexible mounting holes reserved in the test bench body. For example, Figure 2 and Figure 3 The small round hole in the.

[0075] It should be noted that the test bench body in the suspension test bench is of a universal type and can be reused if it has been processed.

[0076] Optionally, in some embodiments, before testing the suspension test bench after assembling the suspension of the vehicle to be evaluated, it also includes: determining the mass of the counterweight according to the half-load weight of the suspension of the vehicle to be evaluated and the mass of the bench body of the suspension test bench; determining the counterweight module based on the counterweight mass, and installing the counterweight module above the suspension test bench after assembling the suspension of the vehicle to be evaluated.

[0077] After the suspension test bench for automobile suspension installation and posture adjustment is established, the suspension of the vehicle to be evaluated can be assembled and posture adjusted through the bench body and the mounting bracket.

[0078] Combination Figure 3 , Figure 4 and Figure 5 As shown, after the suspension of the vehicle to be evaluated is assembled through the test bench body and the mounting bracket, it is hung on the suspension wire rope on the gantry crane, and the height is raised or lowered through the pulley of the gantry crane; after the wheel is suspended in the air, the tire ground clearance can be eliminated through the wheel height adjustment block, wherein the height of the heightening block can be adjusted, and the embodiment of the present application can be implemented by using several thin steel plates.

[0079] In the embodiment of the present application, a rectangular lead block is counterweighted on the suspension test bench and fixed to the upper end surface of the suspension test bench with bolts. The number of blocks is not less than 20, with a total weight of 700 kg. The number of lead blocks can be increased or decreased according to demand.

[0080] The embodiment of the present application realizes the adjustment of the load-bearing weight and posture of the suspension of the vehicle to be evaluated through the counterweight lead block and the gantry hanging device on the mounting surface of the suspension test bench, as well as the air spring and the wheel height adjustment pad at the lower end. It should be noted that the sum of the configuration mass of the counterweight module and the weight of the bench body in the suspension test bench is equal to the half-load weight of the suspension of the vehicle to be evaluated.

[0081] After adjusting the load-bearing weight and posture of the suspension of the vehicle to be evaluated, it is necessary to confirm the posture of the suspension of the vehicle to be evaluated. In this step, the embodiment of the present application needs to measure the size from the key point of the suspension to the tire contact surface, and requires that the size error between this state and the actual vehicle state is within 2%.

[0082] After the suspension test bench is assembled with the suspension of the vehicle to be evaluated, it is necessary to test the suspension test bench and the suspension test bench assembled with the suspension of the vehicle to be evaluated respectively.

[0083] Specifically, for the suspension test bench after assembling the suspension of the vehicle to be evaluated, remove one side of the tire, and use the suspension wire rope and elastic soft rope of the gantry crane to lift the suspension test bench and the suspension of the vehicle to be evaluated on the center of the wheel hub. The load-bearing and posture of the suspension of the vehicle to be evaluated are required to remain unchanged before and after lifting. The pull rope is placed on both sides of the wheel center and a certain preload is applied; the preload requires that the vertical force component is consistent with the axle load of the wheel under the assembly of the whole vehicle, and the horizontal force components on both sides are equal to offset each other, and the pull rope must be soft and elastic to avoid introducing boundary conditions and causing test errors.

[0084] Acceleration sensors are evenly distributed around the wheel center. The sensors are arranged on the same annular surface as much as possible. Four sensors are arranged on the inside and outside of the steering knuckle. To eliminate data test singularity, two acceleration sensors are arranged near the center of the installation point of the suspension test bench of the vehicle to be evaluated. The test bench body is equipped with indicator points for testing, and generally more than three are required. Since the wheel center cannot be tapped and the torque cannot be directly tested, the four bolt installation points on the center plane of the wheel hub are tapped, and then the tapping force and acceleration of the four points are reduced to the center of the wheel hub, thereby obtaining the transfer function from the center of the wheel hub to each suspension installation point of the suspension. Taking the reduction of the tapping point force as an example, the principle is as follows: Figure 6 As shown,

[0085]

[0086] Among them, F x is the impact force at the impact point in the x-axis direction, F y The striking force of the striking point in the y-axis direction is the striking force of the striking point in the z-axis direction, M xx is the moment of the striking point in the x-axis direction, M yy is the moment of the striking point in the y-axis direction, M zz is the moment of the striking point in the z-axis direction, x ck is the horizontal coordinate from the striking point to the wheel center, y ck is the vertical coordinate from the striking point to the wheel center, z ck is the ordinate from the striking point to the wheel center, and k=1, 2, 3, 4 are the serial numbers of the four striking points around the wheel center.

[0087] After removing the suspension, the suspension test bench is fully supported on four air springs to test the dynamic stiffness and transfer function between each suspension mounting point. The air spring technical requirements require that the maximum load-bearing capacity be ≥500kg. To ensure that the entire bench is in a semi-free state, the vertical natural frequency of the vibration system composed of the bench and springs is required to be ≤4Hz. For safety reasons, the air spring mounting plate is designed with four vertical guide rods to prevent rollover.

[0088] Specifically, combined Figure 7 As shown, the embodiment of the present application tests the suspension test bench respectively to obtain the transfer function of the suspension test bench at each first detection point, wherein the first detection point includes the third test point, i.e., the passive end of the suspension bushing, the fifth test point, i.e., the indicator point on the bench, and the first test point, i.e., the center of the wheel hub. The transfer function of the suspension test bench at each first detection point is as follows: Figure 8 shown.

[0089] The embodiment of the present application tests the suspension test bench after assembling the suspension of the vehicle to be evaluated, and obtains the transfer function of the suspension test bench at each second detection point after assembling the suspension of the vehicle to be evaluated, wherein the second detection includes: the first test point, i.e., the wheel hub center test point, the second test point, i.e., the active end of the suspension bushing, the third test point, i.e., the passive end of the suspension bushing, and the fifth test point, i.e., the indicator point on the bench. The transfer function of each second detection point is as follows: Fig. 9 shown.

[0090] In step S102, the transfer function of the suspension of the vehicle to be evaluated is determined according to the transfer function of each second detection point and the transfer function of each first detection point.

[0091] Specifically, the calculation decomposition principle of the transfer function of the vehicle suspension to be evaluated is as follows: Fig.10 The superscripts A and B represent the transfer functions of the suspension test bench and the suspension of the vehicle to be evaluated in their individual states, AB represents the overall transfer function of the suspension test bench after the suspension of the vehicle to be evaluated is assembled, and the subscript numbers represent Fig.10 The transfer function between the points shown in is obtained by testing in different states in step S101, and the transfer function of the suspension of the vehicle to be evaluated is obtained by subtracting the transfer function of each second detection point from the transfer function of each first detection point. Therefore, the transfer function of the suspension itself can be obtained in this embodiment of the present application.

[0092] In step S103, Fig.11 As shown, the tire load and body transfer function of at least one vehicle model equipped with the vehicle suspension to be evaluated are obtained, and the vibration and noise evaluation result of the vehicle suspension to be evaluated is obtained according to the transfer function of the vehicle suspension to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model.

[0093] It will be appreciated by those skilled in the art that the constant load of the tire It is only related to the tire characteristics. During the test, it is only necessary to ensure that the tire load is consistent with the model to be evaluated. It has nothing to do with the specific suspension type of the vehicle being tested. During the test, the vehicle is driven at a predetermined speed on the test track (such as a rough road surface specially designed for road noise) to obtain data from 4 acceleration sensors arranged on the inner side of the steering knuckle. (i=1, 2, 3, 4 are the detection point numbers in the third detection point). The constant load is calculated as follows: The force-acceleration when striking the center bolt mounting point of the rim (the same as the position where the tire hanger is removed in step S101) in the vehicle state The four constant loads at the hub center are reduced to the virtual hub center according to the reduction formula to obtain the total

[0094]

[0095] in, is the tire load, is the transfer function of the third detection point i, is the acceleration data of the third detection point i, and i is the number of the third detection point.

[0096] Testing the dynamic stiffness of a separate tire system When the tire system is fixed to the rigid ground with elastic ropes, the tension of the elastic ropes is adjusted to ensure that the weight of the rim is consistent with that of the vehicle. As mentioned above, the virtual hub center dynamic stiffness is obtained by tapping four positions on the hub center plane and then reducing them.

[0097] The dynamic stiffness of the suspension from the mounting point on the vehicle body to the fourth test point, i.e. the target point of the in-vehicle vibration and noise (such as the driver's ear noise and steering wheel vibration), is obtained by testing the vehicle body in a ready-made state after the suspension is disassembled. and the transfer function It can use the historical database of the corresponding vehicle model or the test results of the benchmark vehicle body.

[0098] It should be noted that the tire load of at least one vehicle model and the body transfer function of at least one vehicle model in the embodiment of the present application can be historical accumulated data for development. When developing a newly developed suspension module, existing test benches and data can be used without necessary reprocessing or testing.

[0099] Optionally, in some embodiments, the vibration noise of at least one vehicle model is determined based on the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model, and the body transfer function of at least one vehicle model, including: based on a preset vibration noise calculation formula, determining the vibration noise of at least one vehicle model based on the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model, and the body transfer function of at least one vehicle model.

[0100] Specifically, Fig.12 As shown, the embodiment of the present application decomposes the whole vehicle into three systems: tire, vehicle suspension and body. The tire constant load can be calculated by the following preset vibration noise calculation formula and the dynamic stiffness of the tire system as input, combined with the suspension transfer function obtained by the test and the body transfer function and The vibration noise inside the car can be calculated

[0101] The preset vibration noise calculation formula is:

[0102]

[0103] in, is the vibration noise, is the tire load, is the dynamic stiffness of the tire, is the transfer function of the first test point, is the transfer function from the second test point to the first test point, is the transfer function of the second test point, is the stiffness value of the bushing, is the dynamic stiffness of the third test point, is the transfer function from the fourth test point to the third test point.

[0104] As described above, 0 and 1 represent the center of the wheel hub of the tire system and the center of the wheel hub on the suspension knuckle after the tire is removed, respectively. They are generally connected by 5 bolts. 2 and 3 mark the active end of the suspension bushing and the active and passive ends of the suspension bushing, respectively. They assemble the suspension on the body through the bushing. The stiffness value of the bushing is Test values ​​provided by bushing suppliers.

[0105] Optionally, in some embodiments, a vibration and noise evaluation result of the suspension of the vehicle to be evaluated is obtained according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model, including: determining the vibration and noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model; obtaining the vibration and noise range of each vehicle model, and judging whether the vibration and noise of at least one vehicle model is in the vibration and noise range of the corresponding vehicle model; if the vibration and noise of all vehicle models are in the vibration and noise range of the corresponding vehicle models, the evaluation result is qualified, otherwise the evaluation result is unqualified.

[0106] The embodiments of the present application can evaluate whether the same suspension module meets the vibration and noise requirements of multiple vehicle models involved. The multiple vehicle models can be divided into A-class models and B-class models according to different vehicle sizes; and divided into SUV models, sedan models, and MPV models according to different body types.

[0107] If the suspension of the vehicle to be evaluated is a universal suspension, all vehicle models equipped with the suspension of the vehicle to be evaluated can be tested to obtain the vibration and noise corresponding to various vehicle models. When the suspension of the vehicle to be evaluated is a unique suspension, the vehicle model equipped with the suspension of the vehicle to be evaluated can be tested.

[0108] Specifically, each vehicle model has different vibration and noise requirements. The embodiment of the present application can obtain the vibration and noise range of each vehicle model, and determine whether the vibration and noise of at least one vehicle model is within the vibration and noise range of the corresponding vehicle model. If the vibration and noise of all vehicle models are within the vibration and noise range of the corresponding vehicle model, the evaluation result is qualified, otherwise the evaluation result is unqualified.

[0109] In other embodiments, in order to improve test efficiency, the embodiments of the present application may also select a model to be evaluated that is equipped with a vehicle suspension to be evaluated, and obtain the vibration noise of the representative model based on the tire load body transfer function of the selected representative model, and determine whether the vibration noise is in the vibration noise range of the corresponding model. If the vibration noise of all representative models is in the vibration noise range of the corresponding model, the evaluation result is qualified, otherwise the evaluation result is unqualified.

[0110] In summary, (1) the load force testing method in the related art is closely related to different tires, road conditions, and even body-end constraints, and therefore cannot independently evaluate the vehicle suspension. The embodiment of the present application can decouple the transfer function of the vehicle suspension from the entire vehicle system including the tires and the body. The obtained transfer function is independent of the tire and body constraints and only reflects the transfer characteristics of the suspension itself. Therefore, it can be used as a characterization parameter for independent evaluation of the suspension module.

[0111] (2) The related art is unable to evaluate whether the same suspension module can meet the requirements of multiple vehicle models. The embodiment of the present application adopts tire load and body transmission function data family as constraint conditions. The data family reflects the actual use environment of various vehicle models. By conducting quantitative analysis on suspension modularization, it is possible to avoid developing suspension modules through iterative optimization of later vehicle models.

[0112] (3) The embodiments of the present application extract independent transfer function indicators of the suspension module and establish corresponding test devices and methods. Before the vehicle model equipped with the suspension to be evaluated is developed, the suspension module can be analyzed and optimized in combination with the tire and body history database, thereby ensuring that the suspension module meets the performance requirements of the vehicle model and performing corresponding target decomposition on the tire and body modules. The road noise can only be verified and optimized by the whole vehicle, and can be advanced to the platform and module development stage, which can reduce more than 60% of the later test prototypes and development cycles, which is of great significance.

[0113] According to the evaluation method of automobile suspension vibration and noise proposed in the embodiment of the present application, by testing the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated respectively, the transfer function of the suspension test bench at each first detection point and the transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point are obtained, and the transfer function of the suspension of the vehicle to be evaluated is determined according to the transfer function of each second detection point and the transfer function of each first detection point, and the tire load and body transfer function of at least one vehicle model equipped with the suspension of the vehicle to be evaluated are obtained, and the vibration and noise evaluation result of the suspension of the vehicle to be evaluated is obtained according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model. Thus, the problem that the related art cannot obtain the transfer function of the automobile suspension and cannot analyze the vibration and noise of the suspension module in multiple vehicle models is solved. The present application can ensure that the preload and installation posture of the suspension in the test and the actual vehicle are consistent, and can simulate the actual use environment of multiple vehicle models; the transfer function of the suspension is independent of the tire and body constraints, and only reflects the transfer characteristics of the suspension itself, and the characterization parameters of the independent evaluation of the suspension module can be obtained.

[0114] Next, a device for evaluating automobile suspension vibration noise according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0115] Fig.13 It is a block diagram of a device for evaluating automobile suspension vibration noise according to an embodiment of the present application.

[0116] like Fig.13 As shown, the vehicle suspension vibration noise evaluation device 10 includes: a testing module 100 , a determining module 200 and an evaluation module 300 .

[0117] Among them, the testing module 100 is used to test the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated, respectively, to obtain the transfer function of the suspension test bench at each first detection point and the transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point.

[0118] The determination module 200 is used to determine the transfer function of the suspension of the vehicle to be evaluated according to the transfer function of each second detection point and the transfer function of each first detection point.

[0119] The evaluation module 300 is used to obtain the tire load and body transfer function of at least one vehicle model equipped with the vehicle suspension to be evaluated, and obtain the vibration and noise evaluation result of the vehicle suspension to be evaluated based on the transfer function of the vehicle suspension to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model.

[0120] Optionally, in some embodiments, the determination module 200 includes: a first determination unit, a first acquisition unit and an evaluation unit.

[0121] The first determination unit is used to determine the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model.

[0122] The first acquisition unit is used to acquire the vibration and noise range of each vehicle model and determine whether the vibration and noise of at least one vehicle model is in the vibration and noise range of the corresponding vehicle model.

[0123] The evaluation unit determines that the vibration noise of all vehicle models is within the vibration noise range of the corresponding vehicle model, and the evaluation result is qualified; otherwise, the evaluation result is unqualified.

[0124] Optionally, in some embodiments, the vibration noise of at least one vehicle model is determined according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model, and the body transfer function of at least one vehicle model, including: based on a preset vibration noise calculation formula, the vibration noise of at least one vehicle model is determined according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model, and the body transfer function of at least one vehicle model, wherein the preset vibration noise calculation formula is:

[0125]

[0126] in, is the vibration noise, is the tire load, is the dynamic stiffness of the tire, is the transfer function of the first test point, is the transfer function from the second test point to the first test point, is the transfer function of the second test point, is the stiffness value of the bushing, is the dynamic stiffness of the third test point, is the transfer function from the fourth test point to the third test point.

[0127] Optionally, in some embodiments, the evaluation module 300 includes: a second acquisition unit, a calculation unit and a generation unit.

[0128] The second acquisition unit is used to acquire at least one tire to be tested.

[0129] The calculation unit is used for frequently testing at least one tire to be tested to obtain acceleration data of each third detection point, and to calculate the transfer function of each third detection point.

[0130] A generating unit is used to obtain the tire load of the tire to be tested based on a preset load merging formula according to the acceleration data of each third detection point and the transfer function of each third detection point, wherein the preset load merging formula is:

[0131]

[0132] in, is the tire load, is the transfer function of the third detection point i, is the acceleration data of the third detection point i, and i is the number of the third detection point.

[0133] Optionally, in some embodiments, before testing the suspension test bench after assembling the vehicle suspension to be evaluated, the testing module 100 further includes: a second determination unit and a counterweight unit.

[0134] The second determination unit is used to determine the mass of the counterweight according to the half-load weight of the suspension of the vehicle to be evaluated and the mass of the test bench body of the suspension test bench;

[0135] The counterweight unit is used to determine the counterweight module based on the counterweight mass, and install the counterweight module above the suspension test bench after assembling the suspension of the vehicle to be evaluated.

[0136] It should be noted that the above explanation of the embodiment of the evaluation method for automobile suspension vibration noise is also applicable to the evaluation device for automobile suspension vibration noise of this embodiment, which will not be repeated here.

[0137] According to the evaluation device for automobile suspension vibration and noise proposed in the embodiment of the present application, by testing the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated respectively, the transfer function of the suspension test bench at each first detection point and the transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point are obtained, and the transfer function of the suspension of the vehicle to be evaluated is determined according to the transfer function of each second detection point and the transfer function of each first detection point, and the tire load and body transfer function of at least one vehicle model equipped with the suspension of the vehicle to be evaluated are obtained, and the vibration and noise evaluation result of the suspension of the vehicle to be evaluated is obtained according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of at least one vehicle model and the body transfer function of at least one vehicle model. Thus, the problem that the related art cannot obtain the transfer function of the automobile suspension and cannot analyze the vibration and noise of the suspension module in multiple vehicle models is solved. The present application can ensure that the preload and installation posture of the suspension in the test and the actual vehicle are consistent, and can simulate the actual use environment of multiple vehicle models; the transfer function of the suspension is independent of the tire and body constraints, and only reflects the transfer characteristics of the suspension itself, and the characterization parameters of the independent evaluation of the suspension module can be obtained.

[0138] Fig.14 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0139] A memory 1401 , a processor 1402 , and a computer program stored in the memory 1401 and executable on the processor 1402 .

[0140] When the processor 1402 executes the program, the evaluation method of the automobile suspension vibration noise provided in the above embodiment is implemented.

[0141] Furthermore, the vehicle also includes:

[0142] The communication interface 1403 is used for communication between the memory 1401 and the processor 1402 .

[0143] The memory 1401 is used to store computer programs that can be executed on the processor 1402 .

[0144] The memory 1401 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0145] If the memory 1401, the processor 1402 and the communication interface 1403 are implemented independently, the communication interface 1403, the memory 1401 and the processor 1402 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.14 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0146] Optionally, in a specific implementation, if the memory 1401, the processor 1402 and the communication interface 1403 are integrated on a chip, the memory 1401, the processor 1402 and the communication interface 1403 can communicate with each other through an internal interface.

[0147] The processor 1402 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0148] The embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for evaluating the vibration noise of a vehicle suspension.

[0149] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0150] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0151] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0152] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0153] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0154] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for evaluating automobile suspension vibration noise, characterized in that: The following steps are involved: Testing the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated respectively, and obtaining the transfer function of the suspension test bench at each first detection point and the transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point; Determining the transfer function of the suspension of the vehicle to be evaluated according to the transfer function of each second detection point and the transfer function of each first detection point; The tire load and body transfer function of at least one vehicle type equipped with the suspension of the vehicle to be evaluated are obtained, and a vibration and noise evaluation result of the suspension of the vehicle to be evaluated is obtained according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle type and the body transfer function of the at least one vehicle type.

2. The method according to claim 1, characterized in that The step of obtaining the vibration and noise evaluation result of the suspension of the vehicle to be evaluated according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model, and the body transfer function of the at least one vehicle model comprises: Determining the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model and the body transfer function of the at least one vehicle model; Obtaining the vibration and noise range of each vehicle model, and determining whether the vibration and noise of at least one vehicle model is within the vibration and noise range of the corresponding vehicle model; If the vibration noise of all vehicle models is within the vibration noise range of the corresponding vehicle model, the evaluation result is qualified, otherwise the evaluation result is unqualified.

3. The method according to claim 2, characterized in that The step of determining the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model, and the body transfer function of the at least one vehicle model comprises: Based on a preset vibration noise calculation formula, the vibration noise of at least one vehicle model is determined according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model, and the body transfer function of the at least one vehicle model, wherein the preset vibration noise calculation formula is: in, is the vibration noise, is the tire load, is the dynamic stiffness of the tire, is the transfer function of the first test point, is the transfer function from the second test point to the first test point, is the transfer function of the second test point, is the stiffness value of the bushing, is the dynamic stiffness of the third test point, is the transfer function from the fourth test point to the third test point.

4. The method according to claim 1, characterized in that: The step of obtaining the tire load and the vehicle body transfer function of at least one vehicle model equipped with the vehicle suspension to be evaluated comprises: Obtain at least one tire to be tested; Frequently testing the at least one tire to be tested to obtain acceleration data of each third detection point, and calculating a transfer function of each third detection point; Based on a preset load merging formula, the tire load of the tire to be tested is obtained according to the acceleration data of each third detection point and the transfer function of each third detection point, wherein the preset load merging formula is: in, is the tire load, is the transfer function of the third detection point i, is the acceleration data of the third detection point i, and i is the number of the third detection point.

5. The method according to claim 1, characterized in that: Before testing the suspension test bench after assembling the vehicle suspension to be evaluated, it also includes: Determining the mass of the counterweight according to the half-load weight of the suspension of the vehicle to be evaluated and the mass of the test bench body of the suspension test bench; A counterweight module is determined based on the counterweight mass, and the counterweight module is installed above the suspension test bench after the suspension of the vehicle to be evaluated is assembled.

6. An evaluation device for automobile suspension vibration noise, characterized in that: include: A testing module, used to test the suspension test bench and the suspension test bench after assembling the suspension of the vehicle to be evaluated, respectively, to obtain a transfer function of the suspension test bench at each first detection point and a transfer function of the suspension test bench after assembling the suspension of the vehicle to be evaluated at each second detection point; A determination module, configured to determine the transfer function of the suspension of the vehicle to be evaluated according to the transfer function of each second detection point and the transfer function of each first detection point; An evaluation module is used to obtain the tire load and body transfer function of at least one vehicle model equipped with the vehicle suspension to be evaluated, and obtain a vibration and noise evaluation result of the vehicle suspension to be evaluated based on the transfer function of the vehicle suspension to be evaluated, the tire load of the at least one vehicle model and the body transfer function of the at least one vehicle model.

7. The device according to claim 6, characterized in that The determining module comprises: A first determination unit, configured to determine the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model and the body transfer function of the at least one vehicle model; A first acquisition unit is used to acquire the vibration and noise range of each vehicle model, and determine whether the vibration and noise of at least one vehicle model is in the vibration and noise range of the corresponding vehicle model; The evaluation unit determines that the evaluation result is qualified when the vibration noise of all vehicle models is within the vibration noise range of the corresponding vehicle model; otherwise, the evaluation result is unqualified.

8. The device according to claim 7, characterized in that The step of determining the vibration noise of at least one vehicle model according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model, and the body transfer function of the at least one vehicle model comprises: Based on a preset vibration noise calculation formula, the vibration noise of at least one vehicle model is determined according to the transfer function of the suspension of the vehicle to be evaluated, the tire load of the at least one vehicle model, and the body transfer function of the at least one vehicle model, wherein the preset vibration noise calculation formula is: in, is the vibration noise, is the tire load, is the dynamic stiffness of the tire, is the transfer function of the first test point, is the transfer function from the second test point to the first test point, is the transfer function of the second test point, is the stiffness value of the bushing, is the dynamic stiffness of the third test point, is the transfer function from the fourth test point to the third test point.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for evaluating the vibration noise of a vehicle suspension as claimed in any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method for evaluating the vibration noise of a vehicle suspension as described in any one of claims 1 to 5.

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