Multi-link suspension modal identification method and device, computer equipment and storage medium

Abstract

The invention discloses a multi-link suspension modal identification method and device, computer equipment and a storage medium. The method comprises the following steps: analyzing a multi-connecting-rod suspension simulation model to obtain an original mode corresponding to a multi-connecting-rod suspension; determining a target excitation point of the multi-link suspension, and obtaining a frequency response curve corresponding to the target excitation point; processing the frequency response curve corresponding to the target excitation point to obtain a modal recognition curve of the multi-link suspension; and based on the modal identification curve of the multi-connecting-rod suspension and the original modal of the multi-connecting-rod suspension, obtaining the target modal of the multi-connecting-rod suspension. Compared with the prior art that a professional engineer identifies the target modals one by one based on experience and knowledge reserve, the method can save manpower and material resources, reduce the modal identification difficulty, save the identification time of modal identification and improve the modal identification efficiency.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a multi-link suspension modal identification method, device, computer equipment and storage medium. Background Art

[0002] In the field of automotive technology, multi-link suspension mode is an inherent attribute of the car and is one of the important indicators for measuring the NVH (NoiseVibrationHarshness) performance of the car. When the existing technology identifies the multi-link suspension mode, it is usually necessary to first perform finite element simulation analysis on the multi-link suspension in the frequency range of 0 to 200 Hz to obtain the 150th to 180th order modal frequencies and corresponding vibration shapes. Subsequently, professional engineers are required to identify about ten major modes (i.e. modal frequencies and corresponding vibration shapes) one by one from the obtained 150th to 180th order modal frequencies and corresponding vibration shapes. This identification method requires a high level of experience and knowledge reserves of professional engineers, increases the difficulty of identification, and reduces the efficiency of identification.

[0003] In summary, the existing technology has great difficulty in identifying the multi-link suspension mode and low recognition efficiency. Therefore, how to reduce the difficulty of modal recognition and improve the modal recognition efficiency is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The embodiments of the present invention provide a multi-link suspension modal recognition method, device, computer equipment and storage medium to solve the problem of how to reduce the difficulty of modal recognition and improve the efficiency of modal recognition.

[0005] A multi-link suspension modal identification method, comprising:

[0006] Analyze the multi-link suspension simulation model to obtain the original mode corresponding to the multi-link suspension;

[0007] Determining a target excitation point of the multi-link suspension, and obtaining a frequency response curve corresponding to the target excitation point;

[0008] Processing the frequency response curve corresponding to the target excitation point to obtain a modal identification curve of the multi-link suspension;

[0009] Based on the modal identification curve of the multi-link suspension and the original modal of the multi-link suspension, a target modal of the multi-link suspension is acquired.

[0010] Preferably, determining a target excitation point of the multi-link suspension and obtaining a frequency response curve corresponding to the target excitation point includes:

[0011] Determining a target excitation point of the multi-link suspension from a subframe of the multi-link suspension;

[0012] A target excitation point of the multi-link suspension is excited separately to determine a frequency response curve corresponding to the target excitation point.

[0013] Preferably, the step of individually exciting a target excitation point of the multi-link suspension and determining a frequency response curve corresponding to the target excitation point includes:

[0014] To the target excitation point of the multi-link suspension, target excitation forces of the same magnitude are applied in the X-axis direction, the Y-axis direction and the Z-axis direction in sequence, and a frequency response curve corresponding to the target excitation point in each excitation direction is obtained.

[0015] Preferably, the performing numerical processing on the frequency response curve corresponding to the target excitation point to obtain the modal identification curve of the multi-link suspension includes:

[0016] Linear addition processing is performed on the frequency response curves corresponding to the target excitation points to obtain a modal identification curve of the multi-link suspension.

[0017] Preferably, the acquiring the target mode of the multi-link suspension based on the mode identification curve of the multi-link suspension and the original mode of the multi-link suspension comprises:

[0018] Based on the modal identification curve of the multi-link suspension, determining a main wave peak corresponding to the modal identification curve and a main wave peak frequency corresponding to the main wave peak;

[0019] The original mode of the multi-link suspension is screened based on the main peak frequency to obtain the target mode of the multi-link suspension.

[0020] Preferably, each of the original modes corresponds to a modal frequency;

[0021] Preferably, the filtering of the original mode of the multi-link suspension based on the main peak frequency to obtain the target mode of the multi-link suspension includes:

[0022] Matching the main wave peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension to determine a target modal frequency;

[0023] The original mode corresponding to the target modal frequency is determined as the target mode of the multi-link suspension.

[0024] Preferably, matching the main wave peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension to determine the target modal frequency includes:

[0025] Matching the main peak frequency with the modal frequency corresponding to the original mode;

[0026] If the modal frequency corresponding to the original mode can be matched, the matched modal frequency is determined as the target modal frequency;

[0027] If the target modal frequency corresponding to the original mode cannot be matched, the modal frequency closest to the main peak frequency is determined as the target modal frequency corresponding to the main peak frequency.

[0028] A multi-link suspension modal identification device, comprising:

[0029] The original mode acquisition module is used to analyze the multi-link suspension simulation model and obtain the original mode corresponding to the multi-link suspension;

[0030] A frequency response curve acquisition module, used to determine a target excitation point of the multi-link suspension and acquire a frequency response curve corresponding to the target excitation point;

[0031] A modal identification curve acquisition module, used for processing the frequency response curve corresponding to the target excitation point to acquire the modal identification curve of the multi-link suspension;

[0032] The target mode acquisition module acquires the target mode of the multi-link suspension based on the mode identification curve of the multi-link suspension and the original mode of the multi-link suspension.

[0033] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the multi-link suspension modal identification method when executing the computer program.

[0034] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the multi-link suspension modal identification method is implemented.

[0035] The multi-link suspension modal identification method, device, computer equipment and storage medium analyze the multi-link suspension simulation model, obtain the original mode corresponding to the multi-link suspension, obtain the frequency response curve corresponding to the target excitation point, obtain the modal identification curve of the multi-link suspension based on the frequency response curve corresponding to the target excitation point, and obtain the target mode of the multi-link suspension based on the modal identification curve of the multi-link suspension and the original mode of the multi-link suspension. Compared with the prior art in which professional engineers identify the target modes one by one based on their experience and knowledge reserves, this method can save manpower and material resources, reduce the difficulty of modal identification, save the recognition time of modal identification, and improve the efficiency of modal identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0037] Figure 1 is a flow chart of a multi-link suspension modal identification method in one embodiment of the present invention;

[0038] Figure 2 is another flow chart of a multi-link suspension modal identification method according to an embodiment of the present invention;

[0039] Figure 3 is another flow chart of a multi-link suspension modal identification method according to an embodiment of the present invention;

[0040] Figure 4 is another flow chart of a multi-link suspension modal identification method according to an embodiment of the present invention;

[0041] Figure 5 is another flow chart of a multi-link suspension modal identification method according to an embodiment of the present invention;

[0042] Figure 6 is a schematic diagram of a multi-link suspension modal identification device according to an embodiment of the present invention;

[0043] Figure 7 is a schematic diagram of a computer device in one embodiment of the present invention;

[0044] Figure 8 is a multi-link suspension simulation model in one embodiment of the present invention;

[0045] Fig. 9 is a partial cloud diagram of the original mode obtained in one embodiment of the present invention;

[0046] Fig.10 are four target excitation points of the multi-link suspension in one embodiment of the present invention;

[0047] Fig.11 is the origin dynamic stiffness curve corresponding to each direction of each target excitation point obtained in one embodiment of the present invention;

[0048] Fig.12 is a modal identification curve obtained in one embodiment of the present invention;

[0049] Fig.13 It is the main peak corresponding to the modal identification curve obtained in one embodiment of the present invention. DETAILED DESCRIPTION

[0050] 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.

[0051] The multi-link suspension modal identification method provided by the embodiment of the present invention can be applied in a computer device to achieve the purpose of reducing the difficulty of modal identification and improving the efficiency of modal identification.

[0052] In one embodiment, if Figure 1 As shown, a multi-link suspension modal identification method is provided, which is described by taking the application of the method in a computer device as an example, and includes the following steps:

[0053] S101: Analyze the multi-link suspension simulation model to obtain the original mode corresponding to the multi-link suspension;

[0054] S102: determining a target excitation point of the multi-link suspension, and obtaining a frequency response curve corresponding to the target excitation point;

[0055] S103: Processing the frequency response curve corresponding to the target excitation point to obtain a modal identification curve of the multi-link suspension;

[0056] S104: Acquire a target mode of the multi-link suspension based on the mode identification curve of the multi-link suspension and the original mode of the multi-link suspension.

[0057] The multi-link suspension simulation model is a simulation analysis model established for finite element analysis of the multi-link suspension. The original mode is a multi-order mode corresponding to the multi-link suspension obtained after finite element analysis of the multi-link suspension simulation model. It can be understood that within a certain frequency range, the finite element analysis of the multi-link suspension simulation model is performed to obtain modes corresponding to multiple frequencies within the frequency range, that is, multi-order modes, and the obtained multi-order modes are used as the original modes of the multi-link suspension.

[0058] As an example, in step S101, the computer device establishes a simulation model corresponding to the multi-link suspension as the multi-link suspension simulation model, performs finite element analysis on the multi-link suspension simulation model within a certain frequency range, and obtains the original mode corresponding to the multi-link suspension within the certain frequency range. In this example, the computer device establishes a multi-link suspension simulation model corresponding to the multi-link suspension (such as Figure 8 As shown in Figure 2, the NASTRAN solver is used to perform finite element analysis on the multi-link suspension simulation model in the frequency range of 0 to 200 Hz to obtain the 150th to 180th order original modes corresponding to the multi-link suspension. Fig. 9 A partial cloud diagram of the original mode is shown. In this example, the multi-link suspension simulation model is analyzed to obtain the original mode corresponding to the multi-link suspension, so as to obtain the target mode of the multi-link suspension based on the original mode of the multi-link suspension.

[0059] The target excitation point is a position in the multi-link suspension that is used to be excited with a corresponding magnitude to obtain a frequency response curve. The frequency response curve refers to a curve showing the relationship between the frequency and the response generated after the target excitation point is excited.

[0060] As an example, in step S102, the computer device determines the target excitation point of the multi-link suspension in the multi-link suspension simulation model, and applies the same magnitude of excitation to each target excitation point in different excitation directions, respectively, to obtain at least two frequency response curves corresponding to each target excitation point in different excitation directions. It can be understood that since the modes of the multi-link suspension include vibration modes in multiple excitation directions, for example, the vibration modes in multiple excitation directions include vibration modes such as the suspension X-direction rigid body, the suspension Z-direction rigid body and the subframe Z-direction torsion mode, it is necessary to apply excitation to each target excitation point in different excitation directions to obtain the frequency response curves corresponding to the different excitation directions, so as to facilitate the subsequent acquisition of the mode of the multi-link suspension in each excitation direction. In addition, applying the same magnitude of excitation to each target excitation point in different excitation directions facilitates the acquisition of the frequency response curves corresponding to each target excitation point in different excitation directions under the same excitation conditions, so as to facilitate the subsequent acquisition of the modal identification curve of the multi-link suspension according to the frequency response curve under the same excitation conditions, so as to make the subsequent modal identification result more accurate. In this example, the target excitation point is determined, and the frequency response curve corresponding to the target excitation point is obtained, so as to facilitate the subsequent acquisition of the modal identification curve of the multi-link suspension according to the frequency response curve.

[0061] The modal identification curve refers to a curve obtained by numerically processing the frequency response curve corresponding to each target excitation point of the multi-link suspension, and is used to obtain the target mode of the multi-link suspension.

[0062] As an example, in step S103, after obtaining at least two frequency response curves corresponding to each target excitation point, the computer device numerically processes all frequency response curves to obtain numerically processed curves, and uses the numerically processed curves as the modal identification curve of the multi-link suspension. For example, the at least two obtained frequency response curves can be linearly added to obtain the modal identification curve of the multi-link suspension. In this example, the modal identification curve of the multi-link suspension is obtained, and multiple frequency response curves are processed to obtain a modal identification curve, which is more intuitive and convenient, and is convenient for determining the target mode of the multi-link suspension according to the modal identification curve, thereby improving the identification efficiency.

[0063] The target mode refers to the main mode of the multi-link suspension that needs to be identified.

[0064] As an example, in step S104, after obtaining the modal identification curve of the multi-link suspension and the original mode of the multi-link suspension, the computer device determines the peak value in the modal identification curve of the multi-link suspension, obtains the frequency corresponding to the peak value, matches the frequencies corresponding to all the peak values ​​with the original mode of the multi-link suspension one by one, matches the corresponding mode in the multi-link suspension, and uses the matched corresponding mode as the target mode. It can be understood that the frequency corresponding to the peak value in the modal identification curve of the multi-link suspension and the mode matched in the modal identification curve are the main modes of the multi-link suspension. Therefore, determining all the peak values ​​in the modal identification curve of the multi-link suspension and the frequencies corresponding to each peak value facilitates more accurate matching of the main mode of the multi-link suspension, and uses the matched main mode of the multi-link suspension as the target mode of the multi-link suspension. In this example, the target mode of the multi-link suspension is obtained based on the modal identification curve of the multi-link suspension and the original mode of the multi-link suspension. The target mode of the multi-link suspension is obtained by matching the identification curve with the original mode. There is no need for professional engineers to identify the target mode one by one based on experience and knowledge reserves. Compared with the existing technology, this method of obtaining the target mode can reduce the difficulty of modal identification and improve the efficiency of modal identification.

[0065] The multi-link suspension modal identification method provided in this embodiment analyzes the multi-link suspension simulation model, obtains the original mode corresponding to the multi-link suspension, obtains the frequency response curve corresponding to the target excitation point, obtains the modal identification curve of the multi-link suspension based on the frequency response curve corresponding to the target excitation point, and obtains the target mode of the multi-link suspension based on the modal identification curve of the multi-link suspension and the original mode of the multi-link suspension. Compared with the prior art in which professional engineers identify the target modes one by one based on their experience and knowledge reserves, this method can save manpower and material resources, reduce the difficulty of modal identification, save the recognition time of modal identification, and improve the efficiency of modal identification.

[0066] In one embodiment, if Figure 2 As shown, step S102, i.e., determining a target excitation point of the multi-link suspension and obtaining a frequency response curve corresponding to the target excitation point, includes:

[0067] S201: determining a target excitation point of the multi-link suspension from a subframe of the multi-link suspension;

[0068] S202: Exciting a target excitation point of the multi-link suspension separately to determine a frequency response curve corresponding to the target excitation point.

[0069] The subframe refers to the vehicle structure mounted on the multi-link suspension and is fixedly mounted on the multi-link suspension through multiple mounting points. The subframe is generally fixedly mounted on the multi-link suspension through four or six mounting points.

[0070] As an example, in step S201, the computer device obtains the mounting points and the number of mounting points between the subframe and the multi-link suspension in the multi-link suspension simulation model. When the number of mounting points is determined to be four, the computer device determines all mounting points as target excitation points; when the number of mounting points is determined to be six, the computer device selects four mounting points that are physically farther away from the remaining mounting points as target excitation points by comparing the physical distances between the mounting points. Fig.10 The figure shows the four target excitation points corresponding to the multi-link suspension in the multi-link suspension simulation model. The target excitation point is determined so that each target excitation point can be separately excited and the frequency response curve corresponding to each target excitation point can be obtained. In this example, the target excitation point of the multi-link suspension is determined from the subframe of the multi-link suspension so that the frequency response curve corresponding to each target excitation point can be obtained.

[0071] As an example, in step S202, after obtaining the target excitation point, the computer device applies excitation to each target excitation point separately, and obtains the frequency response curve generated by each target excitation point after being excited separately. In this example, after obtaining four target excitation points in the multi-link suspension simulation model, the computer device applies 1N excitation to each target excitation point separately, and obtains the origin dynamic stiffness curve generated when each target excitation point is excited separately by 1N as the frequency response curve. For example, when the first target excitation point is excited by 1N alone, the origin dynamic stiffness curve corresponding to the first target excitation point is generated; when the second target excitation point is excited by 1N alone, the origin dynamic stiffness curve corresponding to the second target excitation point is generated; when the third target excitation point is excited by 1N alone, the origin dynamic stiffness curve corresponding to the third target excitation point is generated; when the fourth target excitation point is excited by 1N alone, the origin dynamic stiffness curve corresponding to the fourth target excitation point is generated; the computer device obtains the origin dynamic stiffness curve generated by each target excitation point when it is excited alone, and determines all the origin dynamic stiffness curves as frequency response curves. It can be understood that the origin dynamic stiffness curve is a curve obtained by the ratio of the excitation force to the displacement at the same target excitation point and the same excitation direction, and is a type of frequency response curve in the frequency response curve used for modal identification. In this example, the target excitation point of the multi-link suspension is excited separately to determine the frequency response curve corresponding to the target excitation point, so as to obtain the modal identification curve of the multi-link suspension more accurately according to the frequency response curve corresponding to each target excitation point.

[0072] The multi-link suspension modal identification method provided in this embodiment determines the target excitation point of the multi-link suspension from the subframe of the multi-link suspension, excites the target excitation point of the multi-link suspension separately, and determines the frequency response curve corresponding to each target excitation point, so as to obtain the modal identification curve of the multi-link suspension more accurately according to the frequency response curve corresponding to each target excitation point in the subsequent step.

[0073] In one embodiment, step S202, namely, separately exciting the target excitation point of the multi-link suspension to determine the frequency response curve corresponding to the target excitation point, includes:

[0074] S2021: Apply target excitation forces of the same magnitude to the target excitation point of the multi-link suspension in the X-axis direction, the Y-axis direction, and the Z-axis direction in turn, and obtain a frequency response curve corresponding to the target excitation point in each excitation direction.

[0075] As an example, in step S2021, after obtaining the target excitation point of the multi-link suspension, the computer device applies the same target excitation force to each target excitation point in the X-axis direction, the Y-axis direction, and the Z-axis direction. In this example, after obtaining the target excitation point of the multi-link suspension in the multi-link suspension simulation model, the computer device applies a 1N target excitation force to each target excitation point in the X-axis direction, the Y-axis direction, and the Z-axis direction in sequence, and obtains the origin dynamic stiffness curve generated in each direction within the frequency range of 0-200Hz when each target excitation point is excited with 1N in the three excitation directions as the frequency response curve. Fig.11 The figure shows the origin dynamic stiffness curve generated in each direction within the frequency range of 0-200Hz when each target excitation point is separately excited with 1N in the X-axis direction, Y-axis direction and Z-axis direction. It can be understood that the frequency response curve corresponding to each direction of each target excitation point is generated when it is separately subjected to the target excitation force of the same magnitude. The control variables make the modal identification curve obtained later based on the frequency response curve more accurate.

[0076] The multi-link suspension modal identification method provided in this embodiment applies target excitation forces of the same magnitude to the target excitation point of the multi-link suspension in the X-axis direction, the Y-axis direction and the Z-axis direction in turn, and obtains the frequency response curve corresponding to the target excitation point in each excitation direction, so that the modal identification curve subsequently obtained according to the frequency response curve is feasible, and the target excitation forces of the same magnitude are applied in the X-axis direction, the Y-axis direction and the Z-axis direction, so that the modal identification curve subsequently obtained according to the frequency response curve is more accurate.

[0077] In one embodiment, step S103, namely, numerically processing the frequency response curve corresponding to the target excitation point to obtain the modal identification curve of the multi-link suspension, includes: performing linear addition processing on the frequency response curve corresponding to the target excitation point to obtain the modal identification curve of the multi-link suspension.

[0078] As an example, in step S1031, after the computer device obtains the frequency response curves generated by each target excitation point in the X-axis direction, the Y-axis direction and the Z-axis direction, all the frequency response curves are linearly added in the order of frequency magnitude to obtain the modal identification curve of the multi-link suspension. In this example, after the computer device obtains the origin dynamic stiffness curves generated by each target excitation point in the X-axis direction, the Y-axis direction and the Z-axis direction, all the origin dynamic stiffness curves are linearly added in the order of frequency magnitude to obtain the modal identification curve of the multi-link suspension. It can be understood that the frequency response corresponding to each frequency in the frequency response curve generated by each target excitation point in the X-axis direction, the Y-axis direction and the Z-axis direction is added to obtain the modal identification curve corresponding to each frequency. Fig.12 The figure shows the modal identification curve corresponding to each frequency obtained by adding the origin dynamic stiffness corresponding to each frequency in the origin dynamic stiffness curve generated by each target excitation point in the X-axis direction, Y-axis direction and Z-axis direction. The Y-phase coordinate uses db20 to display the origin dynamic stiffness. Fig.12 It can be seen that the modal identification curve has multiple peaks, and the peak value of each peak is different. Among them, the peak with a larger peak value is the main peak, and the main peak corresponds to the target mode of the multi-link suspension. In this example, all frequency response curves are linearly added in order of frequency magnitude to obtain the modal identification curve of the multi-link suspension. Multiple frequency response curves are linearly added to obtain a modal identification curve, which is more intuitive and convenient. In addition, linear addition of multiple frequency response curves can amplify the curve characteristics in the frequency response curve, which is convenient for obtaining the main peak of the modal identification curve more intuitively and conveniently in the future, thereby improving the identification efficiency.

[0079] The multi-link suspension modal identification method provided in this embodiment performs linear addition processing on the frequency response curves corresponding to the target excitation points to obtain the modal identification curve of the multi-link suspension. The modal identification curve contains the main peak corresponding to the target mode, which facilitates the subsequent acquisition of the main peak of the modal identification curve and facilitates more accurate acquisition of the target mode from the modal identification curve.

[0080] In one embodiment, if Figure 3 As shown, step S104, i.e., obtaining the target mode of the multi-link suspension based on the mode identification curve of the multi-link suspension and the original mode of the multi-link suspension, includes:

[0081] S301: determining, based on a modal identification curve of a multi-link suspension, a main wave peak corresponding to the modal identification curve and a main wave peak frequency corresponding to the main wave peak;

[0082] S302: Screening the original mode of the multi-link suspension based on the main peak frequency to obtain the target mode of the multi-link suspension.

[0083] The main peak refers to the peak with a larger peak value in the modal identification curve. The main peak frequency is the frequency corresponding to the main peak.

[0084] As an example, in step S301, after obtaining the modal identification curve of the multi-link suspension, the computer device determines a peak with a larger peak value in the modal identification curve as the main peak corresponding to the modal identification curve, determines the main peak frequency corresponding to the main peak, obtains the main peak corresponding to the modal identification curve and the main peak frequency corresponding to the main peak, for example, Fig.13 The main peak corresponding to the modal identification curve is shown in Figure 2. Figure 3 As shown, the position indicated by the downward arrow is the main peak, and the corresponding frequency is the main peak frequency; the position indicated by the upward arrow is the remaining peaks except the main peak, and the corresponding frequency is the remaining peak frequency. In actual operation, not only can the original mode of the multi-link suspension be matched and screened based on the main peak frequency corresponding to the main peak to obtain the target mode, but the original mode of the multi-link suspension can also be matched and screened based on the main peak frequency corresponding to the main peak and the remaining peak frequencies corresponding to the remaining peaks to obtain the target mode, so as to prevent omissions in the modal identification process. In this example, the main peak corresponding to the modal identification curve and the main peak frequency corresponding to the main peak are determined, so that the original mode of the multi-link suspension can be screened based on the main peak frequency, which is feasible.

[0085] As an example, in step S302, after determining the main peak frequency corresponding to the main peak, the computer device screens the original mode of the multi-link suspension based on the main peak frequency to screen out the target mode of the multi-link suspension. In this example, the original mode of the multi-link suspension is screened based on the main peak frequency to screen out the target mode of the multi-link suspension, without the need for professional engineers to identify the target mode one by one based on experience and knowledge reserves. This method for obtaining the target mode can reduce the difficulty of mode recognition and improve the efficiency of mode recognition.

[0086] The multi-link suspension modal identification method provided in this embodiment is based on the modal identification curve of the multi-link suspension, determines the main peak corresponding to the modal identification curve and the main peak frequency corresponding to the main peak, screens the original mode of the multi-link suspension based on the main peak frequency, and obtains the target mode of the multi-link suspension. Compared with the prior art that requires professional engineers to screen the original modes one by one, the method for obtaining the target mode can reduce the difficulty of modal identification, reduce the cost of obtaining the target mode, and improve the efficiency of modal identification.

[0087] In one embodiment, each original mode corresponds to a modal frequency. It can be understood that each mode of the multi-link suspension includes a modal frequency and a vibration shape corresponding to the multi-link suspension at each modal frequency, so each original mode corresponds to a modal frequency.

[0088] In one embodiment, if Figure 4 As shown, step S302, i.e., screening the original mode of the multi-link suspension based on the main peak frequency to obtain the target mode of the multi-link suspension, includes:

[0089] S401: Matching the main wave peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension to determine the target modal frequency;

[0090] S402: Determine the original mode corresponding to the target modal frequency as the target mode of the multi-link suspension.

[0091] The target modal frequency is a modal frequency corresponding to the main peak frequency matched among the modal frequencies corresponding to the original modes of the multi-link suspension.

[0092] As an example, in step S401, after obtaining the main peak frequency, the computer device matches each main peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension one by one, matches the modal frequency corresponding to each main peak frequency, and uses the modal frequency corresponding to the matched main peak frequency as the target modal frequency. In this example, within the frequency range of 0-200Hz, 15-order target modal frequencies corresponding to each main peak frequency are matched, including 13.0Hz, 14.5Hz, 22.0Hz, 23.5Hz, 33.5Hz, 38.5Hz, 57.0Hz, 61.0Hz, 84.2Hz, 93.5Hz, 114.5Hz, 128.2Hz, 146.3Hz, 164.0Hz and 183.7Hz. In this example, the target modal frequency corresponding to the main peak frequency is matched without the need for professional engineers to identify each modal frequency, which reduces the difficulty of identification, saves manpower and material resources, and improves the identification efficiency.

[0093] As an example, in step S402, after matching the target modal frequencies corresponding to all main peak frequencies, the computer device determines the original modes corresponding to all target modal frequencies in the original modes of the multi-link suspension as the target modes of the multi-link suspension, thereby realizing modal recognition of the multi-link suspension. In this example, the 15th-order target mode corresponding to the target modal frequency is obtained, and Table 1 shows the modal recognition results obtained by this method, including the target modal frequency and the vibration shape of the multi-link suspension. In this example, the original mode corresponding to the target modal frequency is directly determined as the target mode of the multi-link suspension, which not only makes the modal recognition result more accurate, but also eliminates the need for professional engineers to identify each modal frequency, reduces the difficulty of recognition, saves manpower and material resources, and improves recognition efficiency.

[0094] Table 1

[0095]

[0096] The multi-link suspension modal identification method provided in this embodiment matches the main wave peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension, determines the target modal frequency, and determines the original mode corresponding to the target modal frequency as the target mode of the multi-link suspension. This method not only makes the modal identification result more accurate, but also does not require professional engineers to identify each modal frequency, reduces the difficulty of identification, saves manpower and material resources, and improves identification efficiency.

[0097] In one embodiment, if Figure 5 As shown, step S401, namely matching the main wave peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension to determine the target modal frequency, includes:

[0098] S501: Matching the main wave peak frequency with the modal frequency corresponding to the original mode;

[0099] S502: If the modal frequency corresponding to the original mode can be matched, the matched modal frequency is determined as the target modal frequency;

[0100] S503: If the target modal frequency corresponding to the original mode cannot be matched, the modal frequency closest to the main peak frequency is determined as the target modal frequency corresponding to the main peak frequency.

[0101] As an example, in step S501, when the computer device matches the main peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension, it is necessary to compare the main peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension one by one to determine whether the modal frequency corresponding to the main peak frequency can be matched. It can be understood that for a multi-link suspension system, 150th to 180th order original modes can be generated at 0-200Hz, so the main peak frequency and the modal frequency corresponding to the original mode may not correspond one to one, so it is necessary to determine whether the modal frequency corresponding to the main peak frequency can be matched, so that the subsequent matching of the target modal frequency is feasible.

[0102] As an example, in step S502, when the computer device determines that there is a modal frequency matching the main peak frequency in the modal identification curve of the multi-link suspension, it determines that the modal frequency corresponding to the original mode can be matched, and determines the matched modal frequency as the target modal frequency. In this example, the computer device matches the frequency corresponding to the original mode in the modal identification curve of the multi-link suspension, and determines whether there is a frequency that is completely consistent with the main peak frequency. When it is determined that there is a frequency that is completely consistent with the main peak frequency, the matched frequency that is completely consistent with the main peak frequency is determined as the target modal frequency. In this example, matching the corresponding target modal frequency facilitates the subsequent direct determination of the target mode according to the target modal frequency, without the need for professional engineers to identify each modal frequency, reducing the difficulty of identification, saving manpower and material resources, and improving identification efficiency.

[0103] As an example, in step S503, when the computer device determines that there is no modal frequency matching the main peak frequency in the modal identification curve of the multi-link suspension, it is determined that the modal frequency corresponding to the original mode cannot be matched, and the modal frequency closest to the main peak frequency is determined as the target modal frequency corresponding to the main peak frequency. In this example, the computer device determines whether there is a frequency that is completely consistent with the main peak frequency in the frequency corresponding to the original mode matched in the modal identification curve of the multi-link suspension. When it is determined that there is no frequency that is completely consistent with the main peak frequency, the modal frequency closest to the main peak frequency and having the corresponding original mode is determined as the target modal frequency corresponding to the main peak frequency. It can be understood that since the original mode corresponding to the modal frequency within a certain frequency difference range of the modal identification curve is basically consistent with the target mode corresponding to the main peak frequency, the error is small, therefore, the modal frequency within a certain frequency difference range of the modal identification curve and having the corresponding original mode can be used as the target modal frequency of the main peak frequency, which is convenient for the subsequent target modal identification based on the target modal frequency. In this example, the modal frequency closest to the main peak frequency is determined as the target modal frequency corresponding to the main peak frequency, and matched to the corresponding target modal frequency, so that the target mode can be directly determined according to the target modal frequency in the future. There is no need for professional engineers to identify each modal frequency, which reduces the difficulty of identification, saves manpower and material resources, and improves identification efficiency.

[0104] The multi-link suspension modal identification method provided in this embodiment matches the main wave crest frequency with the modal frequency corresponding to the original mode. If the modal frequency corresponding to the original mode can be matched, the matched modal frequency is determined as the target modal frequency. If the target modal frequency corresponding to the original mode cannot be matched, the modal frequency closest to the main wave crest frequency is determined as the target modal frequency corresponding to the main wave crest frequency. This method can not only ensure a relatively accurate match to the target mode, but also eliminates the need for professional engineers to identify each modal frequency, thereby reducing the difficulty of identification, saving manpower and material resources, and improving identification efficiency.

[0105] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0106] In one embodiment, a multi-link suspension modal identification device is provided, and the multi-link suspension modal identification device corresponds one-to-one to the multi-link suspension modal identification method in the above embodiment. Figure 6 As shown, the multi-link suspension modal identification device includes an original modal acquisition module 601, a frequency response curve acquisition module 602, a modal identification curve acquisition module 603 and a target modal acquisition module 604. The functional modules are described in detail as follows:

[0107] The original mode acquisition module 601 is used to analyze the multi-link suspension simulation model and obtain the original mode corresponding to the multi-link suspension;

[0108] A frequency response curve acquisition module 602 is used to determine a target excitation point of the multi-link suspension and acquire a frequency response curve corresponding to the target excitation point;

[0109] A modal identification curve acquisition module 603 is used to process the frequency response curve corresponding to the target excitation point to obtain a modal identification curve of the multi-link suspension;

[0110] The target mode acquisition module 604 acquires the target mode of the multi-link suspension based on the mode identification curve of the multi-link suspension and the original mode of the multi-link suspension.

[0111] Wherein, each original mode corresponds to a modal frequency.

[0112] In one embodiment, the frequency response curve acquisition module 602 includes:

[0113] A target excitation point determination submodule is used to determine a target excitation point of the multi-link suspension from a subframe of the multi-link suspension;

[0114] The frequency response curve determination submodule is used to individually excite the target excitation point of the multi-link suspension and determine the frequency response curve corresponding to the target excitation point.

[0115] In one embodiment, the frequency response curve determination submodule includes:

[0116] The frequency response curve acquisition unit is used to apply target excitation forces of the same magnitude to the target excitation point of the multi-link suspension in the X-axis direction, the Y-axis direction and the Z-axis direction in sequence, and acquire the frequency response curve corresponding to the target excitation point in each excitation direction.

[0117] In one embodiment, the modal identification curve acquisition module 603 includes:

[0118] The modal identification curve acquisition submodule is used to perform linear addition processing on the frequency response curves corresponding to the target excitation points to obtain the modal identification curve of the multi-link suspension.

[0119] In one embodiment, the target modality acquisition module 604 includes:

[0120] A main wave peak frequency determination submodule determines a main wave peak corresponding to the modal identification curve and a main wave peak frequency corresponding to the main wave peak based on a modal identification curve of the multi-link suspension;

[0121] The target mode acquisition submodule filters the original mode of the multi-link suspension based on the main peak frequency to obtain the target mode of the multi-link suspension.

[0122] In one embodiment, the target modality acquisition submodule includes:

[0123] A target modal frequency determination unit is used to match the main wave peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension to determine the target modal frequency;

[0124] The target mode determination unit is used to determine the original mode corresponding to the target mode frequency as the target mode of the multi-link suspension.

[0125] In one embodiment, the target modal frequency determination unit includes:

[0126] A matching subunit, used for matching the main wave peak frequency with the modal frequency corresponding to the original mode;

[0127] A first judgment subunit is used for determining the matched modal frequency as the target modal frequency if the modal frequency corresponding to the original mode can be matched;

[0128] The second judgment subunit is used to determine the modal frequency closest to the main peak frequency as the target modal frequency corresponding to the main peak frequency if the target modal frequency corresponding to the original mode cannot be matched.

[0129] For the specific definition of the multi-link suspension modal identification device, please refer to the definition of the multi-link suspension modal identification method above, which will not be repeated here. Each module in the above multi-link suspension modal identification device can be implemented in whole or in part by software, hardware and a combination thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0130] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 7 As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data used or generated during the execution of the multi-link suspension modal identification method. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a multi-link suspension modal identification method is implemented.

[0131] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the multi-link suspension modal identification method in the above embodiment is implemented, for example Figure 1 S101-S104 as shown, or Figures 2 to 5 Alternatively, when the processor executes the computer program, the functions of each module / unit in the embodiment of the multi-link suspension modal identification device are realized, for example Figure 6 The functions of the original mode acquisition module 601 , the frequency response curve acquisition module 602 , the mode identification curve acquisition module 603 and the target mode acquisition module 604 are not described here in detail to avoid repetition.

[0132] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the multi-link suspension modal identification method in the above embodiment is implemented, for example Figure 1 S101-S104 as shown, or Figures 2 to 5 Alternatively, when the computer program is executed by a processor, the functions of each module / unit in the embodiment of the multi-link suspension modal identification device are realized, for example Figure 6 The functions of the original mode acquisition module 601, the frequency response curve acquisition module 602, the mode identification curve acquisition module 603 and the target mode acquisition module 604 are not described here to avoid repetition. The computer-readable storage medium may be non-volatile or volatile.

[0133] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0134] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0135] 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 multi-link suspension modal identification method, It is characterized in that include: Analyze the multi-link suspension simulation model to obtain the original mode corresponding to the multi-link suspension; Determining a target excitation point of the multi-link suspension, and obtaining a frequency response curve corresponding to the target excitation point; Processing the frequency response curve corresponding to the target excitation point to obtain a modal identification curve of the multi-link suspension; Based on the modal identification curve of the multi-link suspension and the original modal of the multi-link suspension, a target modal of the multi-link suspension is acquired.

2. The multi-link suspension modal identification method according to claim 1, It is characterized in that The step of determining a target excitation point of the multi-link suspension and obtaining a frequency response curve corresponding to the target excitation point includes: Determining a target excitation point of the multi-link suspension from a subframe of the multi-link suspension; A target excitation point of the multi-link suspension is excited separately to determine a frequency response curve corresponding to the target excitation point.

3. The multi-link suspension modal identification method according to claim 2, It is characterized in that The step of individually exciting a target excitation point of the multi-link suspension and determining a frequency response curve corresponding to the target excitation point includes: To the target excitation point of the multi-link suspension, target excitation forces of the same magnitude are applied in the X-axis direction, the Y-axis direction and the Z-axis direction in sequence, and a frequency response curve corresponding to the target excitation point in each excitation direction is obtained.

4. The multi-link suspension modal identification method according to claim 1, It is characterized in that The performing numerical processing on the frequency response curve corresponding to the target excitation point to obtain the modal identification curve of the multi-link suspension includes: Linear addition processing is performed on the frequency response curves corresponding to the target excitation points to obtain a modal identification curve of the multi-link suspension.

5. The multi-link suspension modal identification method according to claim 1, It is characterized in that The step of acquiring a target mode of the multi-link suspension based on a mode identification curve of the multi-link suspension and an original mode of the multi-link suspension comprises: Based on the modal identification curve of the multi-link suspension, determining a main wave peak corresponding to the modal identification curve and a main wave peak frequency corresponding to the main wave peak; The original mode of the multi-link suspension is screened based on the main peak frequency to obtain the target mode of the multi-link suspension.

6. The multi-link suspension modal identification method according to claim 5, It is characterized in that Each of the original modes corresponds to a modal frequency; The filtering of the original mode of the multi-link suspension based on the main peak frequency to obtain the target mode of the multi-link suspension includes: Matching the main wave peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension to determine a target modal frequency; The original mode corresponding to the target modal frequency is determined as the target mode of the multi-link suspension.

7. The multi-link suspension modal identification method according to claim 6, It is characterized in that The matching of the main wave peak frequency with the modal frequency corresponding to the original mode of the multi-link suspension to determine the target modal frequency includes: Matching the main peak frequency with the modal frequency corresponding to the original mode; If the modal frequency corresponding to the original mode can be matched, the matched modal frequency is determined as the target modal frequency; If the target modal frequency corresponding to the original mode cannot be matched, the modal frequency closest to the main peak frequency is determined as the target modal frequency corresponding to the main peak frequency.

8. A multi-link suspension modal identification device, It is characterized in that include: The original mode acquisition module is used to analyze the multi-link suspension simulation model and obtain the original mode corresponding to the multi-link suspension; A frequency response curve acquisition module, used to determine a target excitation point of the multi-link suspension and acquire a frequency response curve corresponding to the target excitation point; A modal identification curve acquisition module, used for processing the frequency response curve corresponding to the target excitation point to acquire the modal identification curve of the multi-link suspension; The target mode acquisition module acquires the target mode of the multi-link suspension based on the mode identification curve of the multi-link suspension and the original mode of the multi-link suspension.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the computer program, the multi-link suspension modal identification method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program. It is characterized in that When the computer program is executed by a processor, the multi-link suspension modal identification method according to any one of claims 1 to 7 is implemented.

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