Suspension vibration transfer characteristic acquisition method and device and medium

Abstract

The invention discloses a method and a device for acquiring vibration transfer characteristics of a suspension and a medium, which are used for solving the technical problem that the acquisition of the vibration transfer characteristics of the suspension does not have universality in the traditional scheme. The method comprises the following steps: constructing a suspension vibration transmission mathematical model and a suspension finite element simulation model; determining vibration transmission simulation parameters of the suspension finite element simulation model according to the suspension vibration transmission mathematical model; and simulating the suspension finite element simulation model based on the vibration transmission simulation parameters so as to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model, thereby providing accurate suspension vibration characteristic data for vehicle model development, enabling the acquisition of the suspension vibration transmission characteristics to be universal, and improving the vehicle model development efficiency. Therefore, the parameter design is optimized, and the vehicle comfort and performance are improved.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a method, a device and a medium for obtaining suspension vibration transfer characteristics. Background Art

[0002] The vibration transfer characteristics of the suspension have a significant impact on the comfort of the car, which is manifested in two aspects: smoothness and road noise. The former focuses on the low-frequency field below 50Hz, while the latter is strongly correlated with road excitation of 20-300Hz. At present, the evaluation of the vibration transfer characteristics of the suspension is mainly aimed at the impact on smoothness, and there are few evaluation methods in the field of road noise. In traditional solutions, such as the Chinese patent document with publication number CN113486449A, a method for evaluating the vibration transfer characteristics of the suspension is disclosed. The prerequisite for the evaluation is the same platform / chassis, and the actual load of the same chassis model has been obtained, and then the transfer function of the body is optimized to obtain the vibration transfer characteristics of the suspension.

[0003] However, the traditional method also has obvious disadvantages. It fails for different chassis and is not universal. Summary of the invention

[0004] The present invention provides a method, a device and a medium for obtaining suspension vibration transfer characteristics, so as to solve the technical problem that the acquisition of suspension vibration transfer characteristics is not universal in traditional solutions.

[0005] In a first aspect, a method for obtaining suspension vibration transfer characteristics is provided, comprising:

[0006] Construct the suspension vibration transmission mathematical model and the suspension finite element simulation model;

[0007] Determining vibration transmission simulation parameters of the suspension finite element simulation model according to the suspension vibration transmission mathematical model;

[0008] Based on the vibration transfer simulation parameters, the suspension finite element simulation model is simulated to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model.

[0009] In one embodiment, the vibration transfer simulation parameters include the body stiffness of the attachment point between the suspension and the body. Based on the vibration transfer simulation parameters, the suspension finite element simulation model is simulated to obtain the suspension vibration characteristic data under the suspension vibration transfer mathematical model, including:

[0010] The suspension finite element simulation model is simulated based on different vehicle body stiffnesses to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model.

[0011] In one embodiment, the load type includes unit excitation of 20-300 Hz.

[0012] In one embodiment, the different vehicle body stiffnesses include at least any two or more of the following vehicle body stiffness parameters:

[0013] The body stiffness is assigned a value of zero;

[0014] The body stiffness is assigned to be infinite;

[0015] The body stiffness is assigned a constant value;

[0016] The vehicle body stiffness varies accordingly with the vibration excitation frequency.

[0017] In one embodiment, the step of constructing a suspension vibration transmission mathematical model includes:

[0018] According to the structural system of the suspension and the vehicle body suspension, a suspension vibration transmission system is constructed, wherein the frame vibration transmission system includes a suspension, a bushing and a vehicle body connected in sequence;

[0019] According to the suspension vibration transfer system, obtaining a load force-load force transfer function between the suspension and the vehicle body, and a load force-acceleration transfer function between the suspension and the vehicle body;

[0020] The load force-load force transfer function and the load force-acceleration transfer function are used as the suspension vibration transfer mathematical model.

[0021] In one embodiment, it includes:

[0022] The load force-load force transfer function is expressed as:

[0023] The load force-acceleration transfer function is expressed as:

[0024] Among them, F B,2 represents the force load output of the bushing, X B,2 represents the acceleration load output of the bushing, F s,0 represents the load force input of the suspension, represents the origin admittance matrix of the output end of the suspension, represents the origin admittance matrix of the input end of the vehicle body, K, C and ω represent the stiffness, damping and circular frequency of the bushing respectively, is the transfer admittance matrix from the output end of the suspension to the input end of the suspension.

[0025] In a second aspect, a suspension vibration transfer characteristic acquisition device is provided, comprising:

[0026] A construction module, used to construct a suspension vibration transmission mathematical model and a suspension finite element simulation model;

[0027] An acquisition module, used for acquiring vibration transmission simulation parameters of the suspension finite element simulation model according to the suspension vibration transmission mathematical model;

[0028] A simulation module is used to simulate the suspension finite element simulation model based on the vibration transfer simulation parameters to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model.

[0029] In a third aspect, a device for acquiring suspension vibration transfer characteristics is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the above-described methods for acquiring suspension vibration transfer characteristics when executing the computer program.

[0030] In a fourth aspect, a computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for obtaining the vibration transfer characteristics of the suspension as described in any one of the above items are implemented.

[0031] The above-mentioned method, device and medium for obtaining suspension vibration transfer characteristics are intended to solve the technical problem that the existing solutions do not have universality in obtaining suspension vibration transfer characteristics. By constructing a suspension vibration transfer mathematical model and a suspension finite element simulation model; according to the suspension vibration transfer mathematical model, determining the vibration transfer simulation parameters of the suspension finite element simulation model; based on the vibration transfer simulation parameters, simulating the suspension finite element simulation model to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model. The above-mentioned method makes the acquisition of suspension vibration transfer characteristics universal, and provides an accurate reference for optimizing the parameters of suspension transfer characteristics and vehicle body NVH design, thereby improving vehicle comfort, performance and development efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 It is a schematic flow chart of a method for obtaining suspension vibration transfer characteristics in one embodiment of the present invention;

[0034] Figure 2is a schematic diagram of a suspension-body transmission system in one embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a suspension finite element model in one embodiment of the present invention;

[0036] Figure 4 is a schematic diagram of the effect of the subframe-body soft-hard connection on the suspension transfer characteristics in one embodiment of the present invention;

[0037] Figure 5 is a schematic diagram of the effect of bushing stiffness on suspension transfer characteristics in one embodiment of the present invention;

[0038] Figure 6 is a schematic diagram of a simulation curve of the influence of vehicle body stiffness on suspension transfer characteristics in one embodiment of the present invention;

[0039] Figure 7 is a schematic diagram of a trend curve of the influence of vehicle body stiffness on suspension transfer characteristics in one embodiment of the present invention;

[0040] Figure 8 is a schematic diagram comparing the transmission function characteristic curves of a four-link suspension and a five-link suspension in one embodiment of the present invention;

[0041] Fig. 9 It is a structural schematic diagram of a suspension vibration transfer characteristic acquisition device in one embodiment of the present invention;

[0042] Fig.10 It is a structural schematic diagram of an acquisition device in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] 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.

[0044] The embodiments of the present invention mainly provide a method, device and medium for obtaining suspension vibration transfer characteristics, which are applied to various automobiles. The automobile is an intelligent network-connected automobile equipped with active suspension. Exemplarily, the automobile can be equipped with a fast active suspension configuration that uses a motor system as a power source and realizes real-time adjustment of the vertical force of the suspension through a hydraulic system or a mechanical system, wherein the suspension system includes suspension rods, subframes, springs, shock absorbers, stabilizer bars, axle joints, brake discs, bushings and other components, which are not specifically limited. The embodiments of the present invention provide a new method for obtaining suspension vibration transfer characteristics. The following describes the suspension vibration transfer characteristics obtaining method provided by the present invention in detail through various embodiments.

[0045] See also Figure 1 As shown, in one embodiment, a method for obtaining suspension vibration transfer characteristics is provided, which mainly includes the following steps:

[0046] S10: Construct a suspension vibration transmission mathematical model and a suspension finite element simulation model.

[0047] In this embodiment, the suspension vibration transmission mathematical model is a mathematical model used to analyze the behavior of the automobile suspension and the body suspension during the vibration transmission process, and introduce excitations of different frequencies into the suspension vibration transmission mathematical model to analyze the response of the suspension at different frequencies of the road surface, thereby evaluating its vibration isolation performance and vibration transmission characteristics.

[0048] Among them, the structural system of automobile suspension and body suspension can be simplified as follows: Figure 2 The suspension-body transmission system shown in the figure, in which the suspension system is marked as A, the bushing is marked as B, and the body is marked as C. In addition, the subscripts 0, 1, and 2 in the markings represent the input end of the suspension, the output end of the suspension, and the input end of the body, respectively.

[0049] For suspension A, the input and output relationship of vibration and acceleration can be expressed as

[0050]

[0051] in, and are the origin admittance matrices of the suspension input and output, respectively. and are the transfer admittance matrices from the input to the output and from the output to the input of the suspension respectively.

[0052] For bushing B, it can be obtained from the bushing force characteristics

[0053] F A,1 =F B,2

[0054]

[0055] Where K and C are the stiffness and damping of the bushing, and ω is the circular frequency.

[0056] For the body C, the relationship between its response and load is:

[0057]

[0058] in The origin admittance matrix of the vehicle body input end. The origin admittance matrix refers to the electrical characteristics of the vehicle body input end, including the amplitude, phase and frequency of the input signal.

[0059] By combining equations (1), (2) and (3), we can obtain the ratio of the force load at the vehicle body input end to the force load at the suspension input end:

[0060]

[0061] The present invention defines this as the force-force transfer function of the suspension-body, that is, the load force-load force transfer function.

[0062] Similarly, the force-acceleration transfer function of the suspension-body can be obtained, that is, the load force-acceleration transfer function is:

[0063]

[0064] Among them, F B,2 represents the force load output of the bushing, X B,2 represents the acceleration load output of the bushing, F s,0 represents the load force input of the suspension, represents the origin admittance matrix of the output end of the suspension, represents the origin admittance matrix of the input end of the vehicle body, K, C and ω represent the stiffness, damping and circular frequency of the bushing respectively, is the transfer admittance matrix from the output end of the suspension to the input end of the suspension.

[0065] As an example, Figure 3 The suspension finite element simulation model shown is a virtual model based on finite element analysis. It is used to simulate and predict the mechanical behavior and vibration transfer characteristics of the suspension system. In the suspension finite element simulation model, the suspension components are divided into finite element units, including suspension rods, subframes, springs, shock absorbers, stabilizer bars, axle joints, brake discs, and bushings, etc. Each unit has specific material properties. By introducing different excitations and boundary conditions, the vibration response of the suspension under different road conditions can be simulated, and then the vibration isolation performance and the transfer characteristics of the suspension can be analyzed.

[0066] As mentioned above, the purpose of constructing a suspension vibration transfer mathematical model and a suspension finite element simulation model is to deeply study and evaluate the vibration characteristics of the suspension system, so that the acquisition of the suspension vibration transfer characteristics can be universal, thereby providing technical support for optimizing the vehicle's suspension design and performance.

[0067] It should be noted that the above embodiment is only an example and the present invention is not limited thereto.

[0068] S20: Determine vibration transfer simulation parameters of the suspension finite element simulation model according to the suspension vibration transfer mathematical model.

[0069] In this embodiment, the vibration transfer simulation parameters of the suspension finite element simulation model are determined according to the suspension vibration transfer mathematical model. The suspension finite element simulation model is established on a computer by a numerical calculation method, and it is a digital approximation of the actual suspension system. In order for the suspension finite element simulation model to accurately simulate the actual situation, it is necessary to determine the various parameters in the simulation model according to the parameters in the suspension vibration transfer mathematical model. These vibration transfer simulation parameters include the connection mode, stiffness, damping, etc. of the suspension. By mapping the parameters in the mathematical model to the finite element simulation model, the vibration transfer characteristics of the suspension system at different frequencies can be simulated on a computer, and then the performance of the suspension in actual use can be predicted through simulation.

[0070] It should be noted that the above is only an example and the present invention is not limited thereto.

[0071] S30: simulating the suspension finite element simulation model based on the vibration transfer simulation parameters to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model.

[0072] In this embodiment, the established suspension finite element simulation model is input into the computer software, and then set according to the determined vibration transfer simulation parameters. After setting these parameters, simulation calculations are performed to simulate the vibration transfer characteristics of the suspension at different frequencies. By performing simulation calculations, the suspension vibration transfer characteristic data of the suspension at different frequencies can be obtained. These suspension vibration characteristic data include the relationship between the suspension force transmitted to the vehicle body acceleration at different frequencies. By analyzing these suspension vibration characteristic data, the performance of the suspension under different working conditions can be understood, such as the vibration isolation effect and vibration attenuation capacity at different frequencies.

[0073] In the analysis of suspension vibration transfer characteristics, the influence of multiple factors on the transfer function is also considered, including the performance of the suspension itself and the influence of the bushing. Figure 4As shown in the figure, the load-force-load-force transfer function curve and the load-force-acceleration transfer function curve in the suspension transfer characteristics of the subframe-body soft-hard connection indicate that when the subframe adopts a hard connection, the load-force-load-force transfer function and the load-force-acceleration transfer function of the suspension system will become larger. On the contrary, when the subframe adopts a soft connection, the transfer characteristics of the suspension system will become softer, and the vibration force and acceleration transmitted to the body will also decrease. And Figure 5 The load-force-load-force transfer function curve and the load-force-acceleration transfer function curve of the bushing stiffness in the suspension transfer characteristics show that the smaller the bushing stiffness, the smaller the load-force-load-force transfer function and the load-force-acceleration transfer function of the suspension. In addition, the stiffness of the body attachment point is also an important factor, which will affect the simulation results. Specifically, the transfer function describes the transmission relationship between the suspension vibration signal of different components and reflects the interaction between different components.

[0074] It should be noted that the above example is only an example and the present invention is not limited thereto.

[0075] In one embodiment, in step S30, the vibration transfer simulation parameters include the body stiffness of the attachment point between the suspension and the body, and based on the vibration transfer simulation parameters, the suspension finite element simulation model is simulated to obtain the suspension vibration characteristic data under the suspension vibration transfer mathematical model, specifically comprising the following steps:

[0076] S31: simulating the suspension finite element simulation model based on different vehicle body stiffnesses respectively to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model.

[0077] As an example, for different body stiffness values, including stiffness values ​​of zero, infinity, and constant, different body stiffness parameters are set respectively, and are input into the suspension finite element simulation model as part of the vibration transfer simulation parameters. These different body stiffness values ​​can represent the stiffness characteristics of the body under different conditions, thereby simulating different driving conditions in the real world. Then, the suspension finite element simulation is run under each body stiffness value. During the simulation process, the previously set excitation load is applied, and the vibration environment is simulated to obtain the vibration transfer characteristics of the suspension system under different body stiffnesses.

[0078] Through the above simulation analysis, we can obtain data such as the force transmission characteristics of the suspension system and the body response under different body stiffness values. Figure 6As shown in , the changing trend of these suspension vibration characteristic data reflects the influence of different body stiffness on the suspension vibration transfer characteristics. The body stiffness has a small influence on the load-force transfer function, but a great influence on the load-force-acceleration transfer function curve. And as the body stiffness increases, the acceleration at the body end decreases, thus revealing the performance of the suspension system under different driving conditions. At the same time, according to equations (4) and (5) in step S10, it can be obtained as follows Figure 7 As shown in the figure, the non-dimensional suspension transfer function changes with the body. It can be seen that the load-load transfer function changes less with the body stiffness, while the load-acceleration transfer function curve changes more. This figure also confirms Figure 6 The reliability of the simulation results.

[0079] Secondly, if Figure 8 As shown in the figure, through the comparison of the transfer characteristics of different suspensions, it is found that from the wheel center-subframe transfer curve, the four-link and five-link are not much different in terms of wheel center-subframe transfer characteristics; but from the wheel center-rear trailing arm transfer function curve, it is found that the wheel center-rear trailing arm transfer function peak of the four-link is 3 times larger than that of the wheel center-subframe. Therefore, in terms of suspension vibration transmission, it can be concluded that the five-link suspension is better than the four-link.

[0080] Through the above analysis, the influence of the change of the suspension parameters on the vibration isolation performance can be evaluated, and the advantages and disadvantages of different suspensions in terms of vibration isolation performance can be compared horizontally. It should be noted that the above embodiment is only an example, and the specific present invention is not limited thereto.

[0081] In one embodiment, in step S31, simulating the suspension finite element simulation model based on different vehicle body stiffnesses to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model specifically includes the following steps:

[0082] S311: Taking the simulation load application point as the wheel center and the load type as the unit excitation, the suspension finite element simulation model is simulated based on different vehicle body stiffnesses to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model.

[0083] In this embodiment, according to the vibration transfer simulation parameters, especially under the setting of different vehicle body stiffness values, the suspension finite element simulation model is simulated and analyzed to obtain the suspension vibration characteristic data that conforms to the suspension vibration transfer mathematical model. Under each vehicle body stiffness value, the wheel center is used as the simulation load application point for wheel center excitation, and different load types are defined, including the load type of unit excitation and the actually measured wheel center force as the input load type, that is, the response of the suspension output end is the transfer function of the suspension, and the suspension finite element simulation model is simulated and analyzed. Such load setting can simulate the impact and vibration of the suspension system during actual driving, so as to more accurately reflect the vibration transfer characteristics of the suspension, which is helpful to deeply understand the vibration transfer behavior of the suspension system under different vehicle body stiffness conditions, and provide a substantial basis for the optimization design of the suspension and the improvement of the driving comfort of the vehicle.

[0084] It should be noted that the above content is only an example and is not intended to limit the specific present invention.

[0085] In one embodiment, step S311 includes:

[0086] The load types include unit excitations of 20 to 300 Hz.

[0087] In this embodiment, the road noise vibration frequency range is set to 20-300 Hz, and calculation and simulation are performed within the frequency range of 20-300 Hz to obtain the transfer characteristic results of the suspension at different frequencies. It is possible to understand how the suspension system transmits vibration at different frequencies and its impact on the interior and exterior of the vehicle. These transfer characteristic results include data such as load force-load force transfer function and load force-acceleration transfer function, which reveal the response of the suspension at a specific frequency.

[0088] For example, in the lower frequency range (e.g., below 50 Hz), the suspension may have a greater impact on the ride comfort of the vehicle, because these frequencies usually correspond to the vehicle's driving stability and the operating frequency of the suspension system. In the range of 20-300 Hz, the transfer characteristics of the suspension will more significantly affect the vibration and noise levels inside the vehicle, especially the road noise related to road unevenness and bumps.

[0089] It should be noted that the above frequency range is only an example, and may also include a range of 30 to 350 Hz, etc., which is not specifically limited in the present invention.

[0090] In one embodiment, in step S31, the different vehicle body stiffnesses include at least any two or more of the following vehicle body stiffness parameters:

[0091] The body stiffness is assigned a value of zero;

[0092] The body stiffness is assigned to be infinite;

[0093] The body stiffness is assigned a constant value;

[0094] The vehicle body stiffness varies accordingly with the vibration excitation frequency.

[0095] As an example, when operating according to the vibration transfer simulation parameters, a series of suspension finite element simulation analyses need to be performed for different vehicle body stiffness conditions to obtain suspension vibration characteristic data that conforms to the suspension vibration transfer mathematical model. These different vehicle body stiffnesses can be any two or more of the following parameter configurations:

[0096] The body stiffness is assigned a value of zero: the physical meaning of this is that the body end is in a free state, that is, is infinite, the result of equation (4) is zero, that is, the force acting on the body end is zero. In this case, the complete disconnection between the body and the suspension will be simulated, which will help to understand the vibration transmission characteristics of the suspension system without the influence of the body stiffness.

[0097] The body stiffness is assigned to infinity: the physical meaning is that the body end is grounded, that is, is infinitesimal, the result of equation (5) is zero, that is, there is no vibration at the body end. In this case, the rigid connection between the body and the suspension is simulated, for example, the body is completely fixed. This helps to understand the vibration transmission behavior of the suspension under the condition of rigid connection.

[0098] The body stiffness is assigned a constant value: this is common in suspension benches with greater stiffness, and the suspension bench has no obvious modes within the scope of the investigation. In this case, the influence of the body under certain stiffness conditions will be considered, which helps to understand the influence of the flexible connection between the suspension and the body on the vibration transmission.

[0099] The body stiffness changes with the vibration excitation frequency: It is used to simulate the dynamic stiffness of the body attachment point, which can be used to analyze the response in the car. In this case, the body stiffness will be simulated to change with the vibration excitation frequency to more realistically reflect the changing stiffness of the body during actual vehicle driving, which helps to understand the vibration transfer characteristics of the suspension system at different frequencies.

[0100] It should be noted that the above is only an example and the present invention is not limited thereto.

[0101] In one embodiment, in step S10, the step of constructing a suspension vibration transmission mathematical model comprises the following steps:

[0102] S11: constructing a suspension vibration transmission system according to the structural system of the suspension and the vehicle body suspension, wherein the suspension vibration transmission system includes a suspension, a bushing and a vehicle body connected in sequence.

[0103] In this embodiment, a suspension vibration transmission system is constructed according to the structural system of the suspension and the vehicle body suspension, wherein the system comprises a suspension, a bushing and a vehicle body connected in sequence. The construction of the vibration transmission system will provide a better understanding of the vibration transmission behavior between the suspension and the vehicle body. Among them, in the suspension vibration transmission system, the suspension, as the starting part, is responsible for receiving the excitation from the road surface and transmitting the vibration to the next level component through its internal vibration transmission path. The bushing, as the intermediate connection, is responsible for transmitting the suspension vibration to the vehicle body. The vehicle body, as the end of the system, receives the vibration transmission from the suspension. The establishment of the suspension vibration transmission system is helpful to study the vibration transmission characteristics between the suspension and the vehicle body, as well as the mutual influence between the various components. By simulating different excitation conditions and parameter configurations, the vibration characteristic data of the suspension vibration transmission system under different conditions can be obtained, thereby providing a realistic basis for optimizing the suspension design and improving the vehicle performance.

[0104] As an example, taking a car as an example, the following suspension vibration transmission system is constructed:

[0105] Suspension System: Includes various components of the suspension system, such as suspension rods, subframes, springs, shock absorbers, stabilizer bars, axle joints, brake discs, etc. The suspension is the starting point of the system and transmits the vibration of the road surface to the next level components through its structure.

[0106] Bushing: The bushing is connected between the suspension and the vehicle body and acts as an intermediate medium for transmitting vibration.

[0107] Vehicle Body: As the end of the system, the vehicle body receives vibration transmission from the suspension and bushings.

[0108] By simulating and analyzing this suspension vibration transmission system, we can obtain the characteristics of suspension vibration transmission between different components, and then deeply understand the vibration transmission mechanism between the suspension and the vehicle body, providing an important reference for optimizing suspension design and improving vehicle driving comfort.

[0109] It should be noted that the above embodiment is only an example and the present invention does not make any specific limitation thereto.

[0110] S12: According to the suspension vibration transfer system, a load force-load force transfer function between the suspension and the vehicle body, and a load force-acceleration transfer function between the suspension and the vehicle body are obtained.

[0111] In this embodiment, according to the construction of the suspension vibration transfer system, further analysis is performed to obtain the load force-load force transfer function and the load force-acceleration transfer function between the suspension and the vehicle body. When obtaining the load force-load force transfer function, the force transfer behavior between the suspension and the vehicle body is measured. By applying a unit load within different frequency ranges, the load force transferred from the suspension to the vehicle body at different frequencies can be measured, thereby establishing the load force-load force transfer function.

[0112] At the same time, the load force-acceleration transfer function is obtained to reveal the impact of suspension vibration on vehicle body acceleration. By applying a unit load at a specific load point, the acceleration response of the vehicle body at different frequencies can be measured to establish a load force-acceleration transfer function. This function will reveal how suspension vibration is converted into acceleration changes on the vehicle body, which helps to understand the dynamic characteristics of vibration transmission.

[0113] S13: Using the load force-load force transfer function and the load force-acceleration transfer function as the suspension vibration transfer mathematical model.

[0114] In this embodiment, next, the obtained load force-load force transfer function and load force-acceleration transfer function are integrated into the previously constructed suspension vibration transfer mathematical model, so as to improve the above model and make it more practical and accurate.

[0115] By integrating these two transfer functions into the suspension vibration transfer mathematical model, the influence of different suspension parameters, body stiffness and road conditions on vehicle vibration characteristics can be predicted through simulation and calculation. By running and analyzing the model, the mechanism of suspension vibration transfer can be more deeply understood, thus guiding the suspension design and optimization of the vehicle.

[0116] It should be noted that the above is just an example and is not limited to the specific application.

[0117] In one embodiment, in step S13, it includes:

[0118] The load force-load force transfer function is expressed as:

[0119] The load force-acceleration transfer function is expressed as:

[0120] Among them, F B,2 represents the force load output of the bushing, X B,2 represents the acceleration load output of the bushing, F s,0 represents the load force input of the suspension, represents the origin admittance matrix of the output end of the suspension, represents the origin admittance matrix of the input end of the vehicle body, K, C and ω represent the stiffness, damping and circular frequency of the bushing respectively, is the transfer admittance matrix from the output end of the suspension to the input end of the suspension.

[0121] 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.

[0122] In one embodiment, a suspension vibration transfer characteristic acquisition device is provided, and the suspension vibration transfer characteristic acquisition device corresponds to the suspension vibration transfer characteristic acquisition method in the above embodiment. Fig. 9 As shown, the suspension vibration transfer characteristic acquisition device includes a construction module 101, an acquisition module 102 and a simulation module 103. The detailed description of each functional module is as follows:

[0123] A construction module 101 is used to construct a suspension vibration transmission mathematical model and a suspension finite element simulation model;

[0124] An acquisition module 102 is used to acquire vibration transfer simulation parameters of the suspension finite element simulation model according to the suspension vibration transfer mathematical model;

[0125] The simulation module 103 is used to simulate the suspension finite element simulation model based on the vibration transfer simulation parameters to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model.

[0126] In one embodiment, the construction module 101 is specifically used for:

[0127] According to the structural system of the suspension and the vehicle body suspension, a suspension vibration transmission system is constructed, wherein the frame vibration transmission system includes a suspension, a bushing and a vehicle body connected in sequence;

[0128] According to the suspension vibration transfer system, obtaining a load force-load force transfer function between the suspension and the vehicle body, and a load force-acceleration transfer function between the suspension and the vehicle body;

[0129] The load force-load force transfer function and the load force-acceleration transfer function are used as the suspension vibration transfer mathematical model.

[0130] In one embodiment,

[0131] The load force-load force transfer function is expressed as:

[0132] The load force-acceleration transfer function is expressed as:

[0133] Among them, F B,2 represents the force load output of the bushing, X B,2 represents the acceleration load output of the bushing, F s,0 represents the load force input of the suspension, represents the origin admittance matrix of the output end of the suspension, represents the origin admittance matrix of the input end of the vehicle body, K, C and ω represent the stiffness, damping and circular frequency of the bushing respectively, is the transfer admittance matrix from the output end of the suspension to the input end of the suspension.

[0134] In one embodiment,

[0135] The different vehicle body stiffnesses include at least any two or more of the following vehicle body stiffness parameters:

[0136] The body stiffness is assigned a value of zero;

[0137] The body stiffness is assigned to be infinite;

[0138] The body stiffness is assigned a constant value;

[0139] The vehicle body stiffness varies accordingly with the vibration excitation frequency.

[0140] In one embodiment, the simulation module 103 is specifically used to: simulate the suspension finite element simulation model based on different vehicle body stiffnesses respectively, so as to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model.

[0141] In one embodiment, the simulation module 103 is specifically used to: take the simulation load application point as the wheel center, the load type as unit excitation, and simulate the suspension finite element simulation model based on different vehicle body stiffnesses to obtain the suspension vibration characteristic data under the suspension vibration transmission mathematical model.

[0142] In one embodiment, the load type includes unit excitation of 20-300 Hz.

[0143] The specific definition of the suspension vibration transfer characteristic acquisition device can refer to the definition of the suspension vibration transfer characteristic acquisition method in the above text, which will not be repeated here. Each module in the above suspension vibration transfer characteristic acquisition 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.

[0144] In one embodiment, an acquisition device is provided, and its internal structure diagram can be as follows: Fig.10 As shown. The acquisition device includes a processor, a memory, and a network interface connected through a system bus. Among them, the processor of the acquisition device is used to provide computing and control capabilities. The memory of the acquisition device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the processor is used to communicate with the acquisition device and the like through a network connection to send simulation parameters. When the computer program is executed by the processor, a method for acquiring suspension vibration transfer characteristics is implemented.

[0145] In one embodiment, an acquisition 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 following steps are implemented:

[0146] Construct the suspension vibration transmission mathematical model and the suspension finite element simulation model;

[0147] Determining vibration transmission simulation parameters of the suspension finite element simulation model according to the suspension vibration transmission mathematical model;

[0148] Based on the vibration transfer simulation parameters, the suspension finite element simulation model is simulated to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model.

[0149] In one embodiment, when the processor executes the computer program, the processor further specifically implements the following steps:

[0150] The suspension finite element simulation model is simulated based on different vehicle body stiffnesses to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model.

[0151] In one embodiment, when the processor executes the computer program, the processor further specifically implements the following steps:

[0152] The simulation load application point is taken as the wheel center, the load type is taken as the unit excitation, and the suspension finite element simulation model is simulated based on different vehicle body stiffnesses to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model.

[0153] In one embodiment, the load type includes unit excitation of 20-300 Hz.

[0154] In one embodiment, the different vehicle body stiffnesses include at least any two or more of the following vehicle body stiffness parameters:

[0155] The body stiffness is assigned a value of zero;

[0156] The body stiffness is assigned to be infinite;

[0157] The body stiffness is assigned a constant value;

[0158] The vehicle body stiffness varies accordingly with the vibration excitation frequency.

[0159] In one embodiment, when the processor executes the computer program, the processor further specifically implements the following steps:

[0160] According to the structural system of the suspension and the vehicle body suspension, a suspension vibration transmission system is constructed, wherein the frame vibration transmission system includes a suspension, a bushing and a vehicle body connected in sequence;

[0161] According to the suspension vibration transfer system, obtaining a load force-load force transfer function between the suspension and the vehicle body, and a load force-acceleration transfer function between the suspension and the vehicle body;

[0162] The load force-load force transfer function and the load force-acceleration transfer function are used as the suspension vibration transfer mathematical model.

[0163] In one embodiment,

[0164] The load force-load force transfer function is expressed as:

[0165] The load force-acceleration transfer function is expressed as:

[0166] Among them, F B,2 represents the force load output of the bushing, X B,2 represents the acceleration load output of the bushing, F s,0 represents the load force input of the suspension, represents the origin admittance matrix of the output end of the suspension, represents the origin admittance matrix of the input end of the vehicle body, K, C and ω represent the stiffness, damping and circular frequency of the bushing respectively, is the transfer admittance matrix from the output end of the suspension to the input end of the suspension.

[0167] In one embodiment, a suspension vibration transfer characteristic acquisition device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the steps of the suspension vibration transfer characteristic acquisition method described above when executing the computer program.

[0168] In one embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any one of the above-mentioned suspension vibration transfer characteristic acquisition methods are implemented. To avoid repetition, the steps are not described here. The computer-readable storage medium may be non-volatile or volatile.

[0169] 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 can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can 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).

[0170] 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.

[0171] 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 method for obtaining suspension vibration transfer characteristics, characterized in that: include: Construct the suspension vibration transmission mathematical model and the suspension finite element simulation model; Determining vibration transmission simulation parameters of the suspension finite element simulation model according to the suspension vibration transmission mathematical model; Based on the vibration transfer simulation parameters, the suspension finite element simulation model is simulated to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model.

2. The method for obtaining suspension vibration transfer characteristics according to claim 1, characterized in that: The vibration transfer simulation parameters include the body stiffness of the attachment point between the suspension and the body. Based on the vibration transfer simulation parameters, the suspension finite element simulation model is simulated to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model, including: The suspension finite element simulation model is simulated based on different vehicle body stiffnesses to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model.

3. The method for obtaining suspension vibration transfer characteristics according to claim 2, characterized in that: The simulating the suspension finite element simulation model based on different vehicle body stiffnesses to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model includes: The simulation load application point is taken as the wheel center, the load type is taken as unit excitation, and the suspension finite element simulation model is simulated based on different vehicle body stiffnesses to obtain suspension vibration characteristic data under the suspension vibration transmission mathematical model.

4. The method for obtaining suspension vibration transfer characteristics according to claim 3, characterized in that: The load types include unit excitations of 20 to 300 Hz.

5. The method for obtaining suspension vibration transfer characteristics according to any one of claims 2 to 4, characterized in that: The different vehicle body stiffnesses include at least any two or more of the following vehicle body stiffness parameters: The body stiffness is assigned a value of zero; The body stiffness is assigned to be infinite; The body stiffness is assigned a constant value; The vehicle body stiffness varies accordingly with the vibration excitation frequency.

6. The method for obtaining suspension vibration transfer characteristics according to claim 1, characterized in that: The construction of the suspension vibration transmission mathematical model comprises: According to the structural system of the suspension and the vehicle body suspension, a suspension vibration transmission system is constructed, wherein the frame vibration transmission system includes a suspension, a bushing and a vehicle body connected in sequence; According to the suspension vibration transfer system, obtaining a load force-load force transfer function between the suspension and the vehicle body, and a load force-acceleration transfer function between the suspension and the vehicle body; The load force-load force transfer function and the load force-acceleration transfer function are used as the suspension vibration transfer mathematical model.

7. The method for obtaining suspension vibration transfer characteristics according to claim 6, characterized in that: The load force-load force transfer function is expressed as: The load force-acceleration transfer function is expressed as: Among them, F B,2 represents the force load output of the bushing, X B,2 represents the acceleration load output of the bushing, F s,0 represents the load force input of the suspension, represents the origin admittance matrix of the output end of the suspension, represents the origin admittance matrix of the input end of the vehicle body, K, C and ω represent the stiffness, damping and circular frequency of the bushing respectively, is the transfer admittance matrix from the output end of the suspension to the input end of the suspension.

8. A suspension vibration transfer characteristic acquisition device, characterized in that: include: A construction module, used to construct a suspension vibration transmission mathematical model and a suspension finite element simulation model; An acquisition module, used for acquiring vibration transmission simulation parameters of the suspension finite element simulation model according to the suspension vibration transmission mathematical model; A simulation module is used to simulate the suspension finite element simulation model based on the vibration transfer simulation parameters to obtain suspension vibration characteristic data under the suspension vibration transfer mathematical model.

9. A device for acquiring suspension vibration transfer characteristics, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for acquiring the suspension vibration transfer characteristics according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for acquiring the suspension vibration transfer characteristics according to any one of claims 1 to 7 are implemented.

Images