Automobile parts jitter simulation method, device, medium and electronic equipment

Abstract

The present application discloses a method, device, medium and electronic device for simulating the jitter of automobile parts. The method includes: obtaining the hard point load information of the whole vehicle when the automobile is driving on a twisted road; building a finite element model of the whole vehicle, and inputting the hard point load information of the whole vehicle into the finite element model of the whole vehicle; based on the finite element model of the whole vehicle, selecting automobile parts to be simulated, performing modal simulation and kinematic simulation on the automobile parts, and obtaining the modal displacement of the automobile parts under the non-rigid body mode and the corresponding modal participation factor; multiplying and superimposing the modal displacement under the non-rigid body mode and the corresponding modal participation factor to obtain the jitter displacement of the automobile parts. The present application is more accurate in calculating the jitter displacement of automobile parts, and is convenient for optimizing the design of automobile parts.

Description

Background Art

[0002] A car is a power-driven, non-track-borne vehicle with at least four wheels, which is mainly used to carry people and goods. When a car is driving on a twisted road, if the road load excitation frequency is close to or the same as the natural frequency of the car parts themselves, a resonance effect will occur, causing the car parts to shake violently.

[0003] If the auto parts shake violently, it is easy to produce abnormal noise in the whole vehicle or cause the auto parts to scratch other parts of the car, affecting the quality and service life of the car. In order to avoid the violent shaking of auto parts when driving on twisted roads, the dynamic simulation analysis of the whole vehicle is mainly carried out to obtain the shaking displacement of auto parts, and the structure and layout of auto parts are optimized accordingly.

[0004] However, when performing dynamic simulation analysis on the entire vehicle, after the dynamic solution calculation, the analysis result is the total displacement of the automobile parts under the action of external loads. The total displacement is the superposition of the rigid body displacement and the jitter displacement of the automobile parts. It is difficult to directly obtain the jitter displacement of the automobile parts.

[0005] In addition, since the vehicle driving time is from several seconds to hundreds of seconds, its cycle is relatively long, the storage space required for dynamic solution calculations is large, even exceeding 1000GB, resulting in large result files, difficult storage and reading, and difficult to effectively apply in actual work. Summary of the invention

[0006] The embodiments of the present application provide a method, device, medium and electronic device for simulating the jitter of automobile parts. When performing modal simulation and kinematic simulation of automobile parts, the rigid body displacement and the jitter displacement are split to obtain the jitter displacement of the automobile parts, which facilitates the optimization design of the automobile parts.

[0007] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0008] According to a first aspect of an embodiment of the present application, a method for simulating vibration of an automobile part is provided, comprising:

[0009] Obtain the hard point load information of the whole vehicle when the vehicle is driving on a twisted road;

[0010] Build a finite element model of the whole vehicle and input the hard point load information of the whole vehicle into the finite element model of the whole vehicle;

[0011] Based on the finite element model of the whole vehicle, the automobile parts to be simulated are selected, and modal simulation and kinematic simulation are performed on the automobile parts to obtain the modal displacement and corresponding modal participation factor of the automobile parts under the non-rigid body mode;

[0012] The modal displacement under the non-rigid mode and the corresponding modal participation factor are multiplied and superimposed to obtain the jitter displacement of the automobile parts.

[0013] In some embodiments of the present application, based on the above scheme, the modal simulation and kinematic simulation of the automobile parts are performed to obtain the modal displacement of the automobile parts under the non-rigid body mode and the corresponding modal participation factor, including:

[0014] Acquire monitoring points of automobile parts, wherein the monitoring points of automobile parts are the most dangerous nodes of automobile parts;

[0015] Modal simulation and kinematic simulation are performed on the monitoring points of automobile parts to obtain the modal displacement of the monitoring points of automobile parts under non-rigid body mode and the corresponding modal participation factor.

[0016] In some embodiments of the present application, based on the above solution, the step of obtaining monitoring points of automobile parts includes:

[0017] According to the hard point load information of the whole vehicle when the vehicle is driving on a twisted road, the excitation frequency range of the external load is obtained;

[0018] Perform modal simulation on automobile parts to obtain the frequencies of each mode of automobile parts;

[0019] Comparing the excitation frequency range of the external load with the frequencies of each mode of the automobile part, obtaining the resonant mode of the automobile part, wherein the frequency of the resonant mode of the automobile part is within the excitation frequency range of the external load;

[0020] The node corresponding to the maximum value of the modal displacement of the resonance mode of the automobile part is used as the monitoring point.

[0021] In some embodiments of the present application, based on the above solution, the excitation frequency range of the external load is obtained according to the hard point load information of the whole vehicle when the vehicle is driving on a twisted road, including:

[0022] Perform Fourier transform on the vehicle's hard point load information in each time domain channel when the vehicle is driving on a twisted road to obtain the frequency of the load in each channel;

[0023] According to the frequency of each channel load, the excitation frequency range of the external load is obtained.

[0024] In some embodiments of the present application, based on the above solution, the step of building a finite element model of the entire vehicle includes:

[0025] Obtain the material and thickness information of each part of the vehicle;

[0026] Build a vehicle finite element model and assign corresponding material and thickness information to each part of the vehicle finite element model;

[0027] The mass information and center of mass coordinate information of the counterweight parts are collected, and the vehicle finite element model is counterweighted to obtain the finite element model of the whole vehicle.

[0028] In some embodiments of the present application, based on the aforementioned solution, the whole vehicle hard point load information when the vehicle is driving on a twisted road is obtained through VPG simulation or virtual iterative processing of a physical prototype vehicle.

[0029] In some embodiments of the present application, based on the above scheme, the calculation formula of the vibration displacement of the automobile part is as follows:

[0030]

[0031] , where u 抖动 (t) is the vibration displacement of the automobile part at time t, ξ(i) is the modal participation factor of the i-th mode of the automobile part at time t, u i is the modal displacement of the i-th mode of the automobile part, and n is a positive integer greater than or equal to 7.

[0032] In some embodiments of the present application, first, the sum of the modal displacement of the non-rigid mode and the product of the modal participation factor is calculated to obtain the jitter displacement of the automobile parts, and the rigid body displacement is eliminated, which facilitates the optimization design of the automobile parts. Secondly, the most dangerous nodes of the automobile parts are selected as monitoring points, and only the monitoring points are simulated and analyzed, which greatly reduces the storage space required and facilitates reading and storage.

[0033] According to a second aspect of an embodiment of the present application, a device for simulating the vibration of automobile parts is provided, the device comprising:

[0034] An acquisition unit is used to acquire the hard point load information of the entire vehicle when the vehicle is driving on a twisted road;

[0035] Build the unit, build the finite element model of the whole vehicle, and input the hard point load information of the whole vehicle into the finite element model of the whole vehicle;

[0036] The analysis unit selects the automobile parts to be simulated based on the finite element model of the whole vehicle, performs modal simulation and kinematic simulation on the automobile parts, and obtains the modal displacement of the automobile parts under the non-rigid body mode and the corresponding modal participation factor;

[0037] The unit is obtained, and the modal displacement under the non-rigid mode and the corresponding modal participation factor are multiplied and superimposed to obtain the jitter displacement of the automobile parts.

[0038] In some embodiments of the present application, based on the above solution, the analysis unit 103 includes:

[0039] A first acquisition unit is used to acquire a monitoring point of an automobile part, wherein the monitoring point of the automobile part is the most dangerous node of the automobile part;

[0040] First, a unit is obtained, which performs modal simulation and kinematic simulation on the monitoring point of the automobile part to obtain the modal displacement of the monitoring point of the automobile part under the non-rigid body mode and the corresponding modal participation factor.

[0041] In some embodiments of the present application, based on the above solution, the first acquisition unit includes:

[0042] Second, the unit is obtained, and the excitation frequency range of the external load is obtained according to the hard point load information of the whole vehicle when the vehicle is driving on a twisted road;

[0043] The third unit is used to perform modal simulation on the automobile parts to obtain the frequencies of each mode of the automobile parts;

[0044] A comparison unit compares the excitation frequency range of the external load and the frequencies of each mode of the automobile part to obtain the resonance mode of the automobile part, wherein the frequency of the resonance mode of the automobile part is within the excitation frequency range of the external load;

[0045] As a unit, the node corresponding to the maximum value of the modal displacement of the resonance mode of the automobile part is used as the monitoring point.

[0046] In some embodiments of the present application, based on the above solution, the second obtaining unit includes:

[0047] The fourth obtaining unit performs Fourier transform on the vehicle hard point load information of each time domain channel when the vehicle is driving on a twisted road surface to obtain the frequency of each channel load;

[0048] The fifth obtaining unit obtains the excitation frequency range of the external load according to the frequency of the load of each channel.

[0049] In some embodiments of the present application, based on the above solution, the building unit includes:

[0050] The second acquisition unit acquires the material and thickness information of each part of the vehicle;

[0051] The first building unit builds a vehicle finite element model and assigns corresponding material and thickness information to each part of the vehicle finite element model;

[0052] The sixth obtaining unit collects the mass information and the center of mass coordinate information of the counterweight parts, performs counterweighting on the vehicle finite element model, and obtains the whole vehicle finite element model.

[0053] In some embodiments of the present application, based on the aforementioned solution, the acquisition unit is obtained through VPG simulation or virtual iterative processing of a physical prototype vehicle.

[0054] In some embodiments of the present application, based on the above scheme, the obtaining unit includes:

[0055] The calculation unit calculates the jitter displacement using the following calculation formula:

[0056]

[0057] Among them, u 抖动 (t) is the vibration displacement of the automobile part at time t, ξ(i) is the modal participation factor of the i-th mode of the automobile part at time t, u i is the modal displacement of the i-th mode of the automobile part, and n is a positive integer greater than or equal to 7.

[0058] According to a third aspect of the embodiments of the present application, a computer-readable storage medium is provided, on which a computer program is stored. The computer program includes executable instructions. When the executable instructions are executed by a processor, the method described in any embodiment of the first aspect above is implemented.

[0059] According to a fourth aspect of an embodiment of the present application, an electronic device is provided, comprising: one or more processors; and a memory for storing executable instructions of the processors, wherein when the executable instructions are executed by the one or more processors, the one or more processors implement the method described in any embodiment of the first aspect above.

[0060] The beneficial effects of each embodiment of the second to fourth aspects mentioned above can refer to the beneficial effects of the first aspect and each embodiment of the first aspect mentioned above, and will not be repeated here.

[0061] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0063] Figure 1 A flow chart showing a method for simulating the vibration of automobile parts in an embodiment of the present application is shown;

[0064] Figure 2 A schematic diagram showing the hard point load information of the chassis on the vehicle side when the vehicle in the embodiment of the present application is traveling on a twisted road;

[0065] Figure 3 A schematic diagram of a finite element model of a whole vehicle in an embodiment of the present application is shown;

[0066] Figure 4 A schematic diagram showing the body side chassis hard point load information of each time domain channel when the vehicle in the embodiment of the present application is driving on a twisted road;

[0067] Figure 5 A schematic diagram showing the frequency of each channel load in an embodiment of the present application;

[0068] Figure 6 A schematic diagram showing monitoring points of a power battery pack cover plate in an embodiment of the present application is shown;

[0069] Figure 7 A block diagram of an automobile parts vibration simulation device in an embodiment of the present application is shown;

[0070] Figure 8 is a schematic diagram of a computer-readable storage medium according to an embodiment of the present invention;

[0071] Fig. 9 FIG. 4 is a schematic diagram of a system structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0072] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0073] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0074] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0075] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0076] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0077] Figure 1 A flow chart of a method for simulating the vibration of automobile parts in an embodiment of the present application is shown. The method for simulating the vibration of automobile parts can be executed by a device with a computing and processing function.

[0078] Reference Figure 1 As shown, the automobile parts vibration simulation method at least includes S1 to S4, which are described in detail as follows:

[0079] In step S1, the hard point load information of the entire vehicle when the vehicle is driving on a twisted road is obtained.

[0080] In the present application, the twisted road surface can be a simulated road surface in the software, a real test road surface, or a road surface that simulates a real test road surface. The driving of a car on a twisted road surface can be carried out through software simulation or by testing the vehicle on a twisted road surface. The hard points of the whole vehicle can be the designed hard points of the whole vehicle, and the hard point load information of the whole vehicle can be obtained through software simulation or through actual vehicle measurement.

[0081] In step S2, a finite element model of the whole vehicle is constructed, and the hard point load information of the whole vehicle is input into the finite element model of the whole vehicle.

[0082] In the present application, the whole vehicle finite element model can be a TB finite element model. The whole vehicle finite element model is a model established when using the finite element analysis method. It is a group of unit combinations that are only connected at nodes, only transmit forces at nodes, and are only constrained at nodes. The hard point load information of the whole vehicle is input into the whole vehicle finite element model in a one-to-one correspondence manner. For example, the A hard point load information is input into the A hard point finite element model of the whole vehicle.

[0083] In step S3, based on the whole vehicle finite element model, the automobile parts to be simulated are selected, and modal simulation and kinematic simulation are performed on the automobile parts to obtain the modal displacement of the automobile parts under the non-rigid body mode and the corresponding modal participation factor.

[0084] In the present application, the order of the non-rigid mode of the automobile parts is ≥7, the order of the rigid mode of the automobile is 1 to 6, and the modal displacement of the automobile parts under the non-rigid mode and the corresponding modal participation factor can be obtained step by step. For example, the modal displacement of the automobile parts under the non-rigid mode is first obtained through modal simulation, and then the modal participation factor of the automobile parts under the non-rigid mode is obtained through kinematic simulation.

[0085] In step S4, the modal displacement under the non-rigid body mode and the corresponding modal participation factor are multiplied and superimposed to obtain the jitter displacement of the automobile part.

[0086] In the present application, the modal simulation and kinematic simulation of the automobile parts are performed to obtain the modal displacement of the automobile parts under the non-rigid body mode and the corresponding modal participation factor, including:

[0087] Acquire monitoring points of automobile parts, wherein the monitoring points of automobile parts are the most dangerous nodes of automobile parts;

[0088] Modal simulation and kinematic simulation are performed on the monitoring points of automobile parts to obtain the modal displacement of the monitoring points of automobile parts under non-rigid body mode and the corresponding modal participation factor.

[0089] Specifically, the most dangerous node can be the node with the most violent jitter or the node with the largest resonance amplitude. The output data is limited to the simulation results of the monitoring points of the automobile parts. There is no need to output the simulation results of the entire vehicle nodes or all nodes of the automobile parts. The required storage space is greatly reduced, making it convenient to read and store.

[0090] In this application, the monitoring points of obtaining automobile parts include:

[0091] According to the hard point load information of the whole vehicle when the vehicle is driving on a twisted road, the excitation frequency range of the external load is obtained;

[0092] Perform modal simulation on automobile parts to obtain the frequencies of each mode of automobile parts;

[0093] Comparing the excitation frequency range of the external load with the frequencies of each mode of the automobile part, obtaining the resonant mode of the automobile part, wherein the frequency of the resonant mode of the automobile part is within the excitation frequency range of the external load;

[0094] The node corresponding to the maximum value of the modal displacement of the resonance mode of the automobile part is used as the monitoring point.

[0095] Specifically, during driving, the jitter generated by automobile parts is a comprehensive external response formed by the multiplication and superposition of each order modal displacement and modal participation factor of automobile parts under the excitation of external load. In order to determine the monitoring point, it is first necessary to find the mode with the largest contribution. Based on the resonance principle, the frequency corresponding to the mode with the largest contribution is within the frequency range of external load excitation. The finite element model of the whole vehicle is modally simulated, and the frequencies of each order mode of automobile parts are extracted. By comparing the frequencies of each order mode of automobile parts with the excitation frequency range of external load, it can be seen that the frequency of the Nth order mode is within the excitation frequency range of external load. The Nth order mode is the mode with the largest contribution, where N is a positive integer. Secondly, the node with the maximum modal displacement in the Nth order mode is used as the monitoring point, that is, the node with the most severe jitter in the Nth order mode is used as the monitoring point.

[0096] In the present application, the excitation frequency range of the external load is obtained based on the hard point load information of the entire vehicle when the vehicle is driving on a twisted road, including:

[0097] Perform Fourier transform on the vehicle's hard point load information in each time domain channel when the vehicle is driving on a twisted road to obtain the frequency of the load in each channel;

[0098] According to the frequency of each channel load, the excitation frequency range of the external load is obtained.

[0099] Specifically, the main distribution range of the frequency of each channel load can be used as the excitation frequency range of the external load.

[0100] In this application, the construction of the whole vehicle finite element model includes:

[0101] Obtain the material and thickness information of each part of the vehicle;

[0102] Build a vehicle finite element model and assign corresponding material and thickness information to each part of the vehicle finite element model;

[0103] The mass information and center of mass coordinate information of the counterweight parts are collected, and the vehicle finite element model is counterweighted to obtain the finite element model of the whole vehicle.

[0104] Specifically, the vehicle finite element model includes a body-in-white finite element model and a finite element model of the automobile parts to be simulated. The counterweight parts include the left front door, left rear door, back door, hood, main instrument panel, auxiliary instrument panel, central air conditioning, cooling module and front and rear bumpers.

[0105] In the present application, the whole vehicle hard point load information when the vehicle is driving on a twisted road is obtained through VPG simulation or virtual iterative processing of a physical prototype vehicle, wherein the VPG simulation can be performed based on Adams software.

[0106] In this application, the calculation formula for the vibration displacement of the automobile parts is as follows:

[0107]

[0108] , where u 抖动 (t) is the vibration displacement of the automobile part at time t, ξ(i) is the modal participation factor of the i-th mode of the automobile part at time t, u i is the modal displacement of the i-th mode of the automobile part, and n is a positive integer greater than or equal to 7.

[0109] In addition, the jitter displacement can also be obtained by subtracting the rigid displacement from the total displacement. That is, the jitter displacement is the displacement after the rigid displacement is removed from the total displacement. The calculation formula is as follows:

[0110]

[0111] ,u 抖动 (t) is the vibration displacement of the automobile part at time t, u(t) is the total displacement of the automobile part at time t, u 刚性 (t) is the rigid displacement of the automobile part at time t, ξ(i) is the modal participation factor of the i-th mode of the automobile part at time t, u i is the modal displacement of the i-th mode of the automobile part, and m is a positive integer greater than or equal to 7.

[0112] In order to better understand the present embodiment, taking the power battery pack cover of an electric vehicle as an example, a specific example is provided as follows:

[0113] (1) Based on Adams software, the VPG simulation method is used to obtain the hard point load information of the chassis side of the vehicle when the vehicle is driving on a twisted road. Figure 2 ;

[0114] (2) Obtain the material and thickness information of each part of the vehicle and build a TB finite element model of the vehicle. Specifically, build a body-in-white finite element model and a power battery pack finite element model, assign corresponding material and thickness information to the body-in-white finite element model and the power battery pack finite element model, collect the mass information and center of mass coordinate information of the counterweight parts, counterweight the vehicle finite element model, and obtain the finite element model of the vehicle. The mass information and center of mass coordinate information of the counterweight parts are shown in Table 1, and the finite element model of the vehicle is shown in Table 2. Figure 3 ;

[0115] Table 1

[0116] Component quality Center of mass coordinates (X, Y, Z) Left front door 18.8Kg 2547.35,-883.44,930.54 Left rear door 17.2Kg 3664.26-873.49,975.73 Back door 18.Kg 5323.81,0.046,1167.54 Hood 10.6kg 1297.91-0.008,1114.01 Main Dashboard 27.1Kg 2137.24，-29.87，1091.61 Sub-dashboard 14.98kg 2718.167，-5.128，784.916 Central air conditioning 11.4kg 1995.000，127.000，910.000 Cooling module 16.24kg 819.828，-7.381，736.955 Qianbao 10.97kg 644.574，1.766，735.659 Post-guarantee 9.63kg 5507.015，-1.440，717.040 …… …… ……

[0117] (3) Perform Fourier transform on the hard point load information of the chassis on the side of the vehicle body in each time domain channel when the vehicle is driving on a twisted road, obtain the frequency of the load in each channel, and obtain the main frequency range that can be excited by the external load. The hard point load information of the chassis on the side of the vehicle body in each time domain channel when the vehicle is driving on a twisted road can be found in Figure 4 , the frequency of each channel load can be found in Figure 5 ,according to Figure 5 It can be seen that the main frequency range that can be excited by external loads is from 5 to 20 Hz;

[0118] (4) During driving, the vibration generated by the power battery pack cover is a comprehensive external response formed by the multiplication and superposition of the displacements of each order of the power battery pack cover and the modal participation factors under the excitation of the external load. In order to determine the monitoring point, it is first necessary to find the mode with the largest contribution. Based on the resonance principle, the frequency corresponding to the mode with the largest contribution is within the frequency range of the external load excitation. The modal simulation of the TB finite element model of the whole vehicle is performed to extract the frequencies of each order of the power battery pack cover. By comparing the frequencies of each order of the power battery pack cover with the excitation frequency range of the external load, it can be seen that the Z-direction motion formation of the battery pack cover in the 7th order mode is in the range of 5 to 20 Hz. Therefore, the node with the maximum modal displacement in this mode is used as the monitoring point, that is, the node with the most severe vibration in the 7th order mode is used as the monitoring point. For the monitoring point of the power battery pack cover, see Figure 6 ;

[0119] (5) The body side chassis hard point load information is input into the vehicle TB finite element model. Specifically, the body side chassis hard point load information is input into the vehicle TB finite element model in the form of a load drive card. First, the load file (.rsp format) generated by Adams is converted into an 8-character table format recognizable by the finite element software Nastran. Then, the load information in the table format is created on the load information card.

[0120] (6) First, a free modal analysis step of the TB finite element model of the whole vehicle is established to output the modal displacement corresponding to the monitoring point under different order modes. Secondly, a twisted road driving condition analysis step of the TB finite element model of the whole vehicle is established to output the modal participation factor corresponding to each order mode at each moment.

[0121] (7) The modal superposition dynamics solution method is used to solve the vibration displacement of the power battery pack cover. The calculation formula is as follows:

[0122]

[0123] , where u 抖动 (t) is the vibration displacement of the automobile part at time t, ξ(i) is the modal participation factor of the i-th mode of the automobile part at time t, u iis the modal displacement of the i-th mode of the automobile part, and n is a positive integer greater than or equal to 7.

[0124] In summary, a direct evaluation simulation method is provided to determine whether resonance jitter of automobile parts will occur when the automobile is driving on a twisted road. This can provide guidance for the structural design of automobile parts and the design of connection relationships of automobile parts (such as the number of bolts and their layout) of OEMs. It can take into account the comprehensive impact of road loads, chassis, body and other aspects on the simulated automobile parts, abandoning the traditional simulation evaluation method of only performing simulation on individual automobile parts, greatly improving the simulation accuracy, increasing the one-time pass rate of the test, reducing problems in actual vehicle tests, and thus reducing design redundancy and cost increases.

[0125] Figure 7 A block diagram of the automobile parts vibration simulation device in the embodiment of the present application is shown, see Figure 7 According to a second aspect of an embodiment of the present application, there is provided an automobile part vibration simulation device 100, the device comprising:

[0126] An acquisition unit 101 acquires the hard point load information of the entire vehicle when the vehicle is driving on a twisted road;

[0127] A construction unit 102 is used to construct a finite element model of the whole vehicle and input the hard point load information of the whole vehicle into the finite element model of the whole vehicle;

[0128] The analysis unit 103 selects the automobile parts to be simulated based on the finite element model of the whole vehicle, performs modal simulation and kinematic simulation on the automobile parts, and obtains the modal displacement of the automobile parts under the non-rigid body mode and the corresponding modal participation factor;

[0129] The unit 104 is obtained, and the modal displacement under the non-rigid body mode and the corresponding modal participation factor are multiplied and superimposed to obtain the jitter displacement of the automobile part.

[0130] In the present application, the analysis unit 103 includes:

[0131] A first acquisition unit is used to acquire a monitoring point of an automobile part, wherein the monitoring point of the automobile part is the most dangerous node of the automobile part;

[0132] First, a unit is obtained, which performs modal simulation and kinematic simulation on the monitoring point of the automobile part to obtain the modal displacement of the monitoring point of the automobile part under the non-rigid body mode and the corresponding modal participation factor.

[0133] Specifically, the first acquiring unit includes:

[0134] Second, the unit is obtained, and the excitation frequency range of the external load is obtained according to the hard point load information of the whole vehicle when the vehicle is driving on a twisted road;

[0135] The third unit is used to perform modal simulation on the automobile parts to obtain the frequencies of each mode of the automobile parts;

[0136] A comparison unit compares the excitation frequency range of the external load and the frequencies of each mode of the automobile part to obtain the resonance mode of the automobile part, wherein the frequency of the resonance mode of the automobile part is within the excitation frequency range of the external load;

[0137] As a unit, the node corresponding to the maximum value of the modal displacement of the resonance mode of the automobile part is used as the monitoring point.

[0138] In the present application, the second obtaining unit includes:

[0139] The fourth obtaining unit performs Fourier transform on the vehicle hard point load information of each time domain channel when the vehicle is driving on a twisted road surface to obtain the frequency of each channel load;

[0140] The fifth obtaining unit obtains the excitation frequency range of the external load according to the frequency of the load of each channel.

[0141] In the present application, the building unit 102 includes:

[0142] The second acquisition unit acquires the material and thickness information of each part of the vehicle;

[0143] The first building unit builds a vehicle finite element model and assigns corresponding material and thickness information to each part of the vehicle finite element model;

[0144] The sixth obtaining unit collects the mass information and the center of mass coordinate information of the counterweight parts, performs counterweighting on the vehicle finite element model, and obtains the whole vehicle finite element model.

[0145] In the present application, the acquisition unit 101 is obtained through VPG simulation or virtual iterative processing of a physical prototype vehicle.

[0146] In the present application, the obtaining unit 104 includes:

[0147] The calculation unit calculates the jitter displacement using the following calculation formula:

[0148]

[0149] , where u 抖动 (t) is the vibration displacement of the automobile part at time t, ξ(i) is the modal participation factor of the i-th mode of the automobile part at time t, u i is the modal displacement of the i-th mode of the automobile part, and n is a positive integer greater than or equal to 7.

[0150] Based on the same inventive concept, as a third aspect, the present application also provides a computer-readable storage medium on which is stored a program product capable of implementing the above-mentioned automobile part jitter simulation method of the present specification. In some possible implementations, various aspects of the present application can also be implemented in the form of a program product, which includes a program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary implementations of the present application described in the above-mentioned "Exemplary Method" section of the present specification.

[0151] refer to Figure 8 As shown, a program product 200 for implementing the above method according to an embodiment of the present application is described, which can adopt a portable compact disk read-only memory (CD-ROM) and include program code, and can be run on a terminal device, such as a personal computer. However, the program product of the present application is not limited thereto. In this document, a readable storage medium can be any tangible medium containing or storing a program, which can be used by or in combination with an instruction execution system, an apparatus or a device.

[0152] The program product may use any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0153] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0154] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0155] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., using an Internet service provider to connect through the Internet).

[0156] As another aspect, the present application also provides an electronic device capable of implementing the above method.

[0157] Those skilled in the art will appreciate that various aspects of the present application may be implemented as a system, method or program product. Therefore, various aspects of the present application may be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software, which may be collectively referred to as "circuit", "module" or "system" herein.

[0158] Refer to the following Fig. 9 The electronic device 300 according to this embodiment of the present application is described. Fig. 9 The electronic device 300 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0159] like Fig. 9 As shown, the electronic device 300 is in the form of a general computing device. The components of the electronic device 300 may include but are not limited to: at least one processing unit 310, at least one storage unit 320, and a bus 330 connecting different system components (including the storage unit 320 and the processing unit 310).

[0160] The storage unit stores program codes, which can be executed by the processing unit 310, so that the processing unit 310 executes the steps described in the above “Example Method” section of this specification according to various exemplary implementations of the present application.

[0161] The storage unit 320 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 321 and / or a cache memory unit 322 , and may further include a read-only memory unit (ROM) 323 .

[0162] The storage unit 320 may also include a program / utility 324 having a set (at least one) of program modules 325, such program modules 325 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0163] Bus 330 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0164] The electronic device 300 may also communicate with one or more external devices 400 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 300, and / or communicate with any device that enables the electronic device 300 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 350. Furthermore, the electronic device 300 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 360. As shown, the network adapter 360 communicates with other modules of the electronic device 300 via a bus 330. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 300, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0165] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0166] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0167] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0168] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly or all or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store program code.

[0169] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A method for simulating the vibration of automobile parts, characterized in that: include: Obtain the hard point load information of the whole vehicle when the vehicle is driving on a twisted road; Build a finite element model of the whole vehicle and input the hard point load information of the whole vehicle into the finite element model of the whole vehicle; Based on the whole vehicle finite element model, an automobile part to be simulated is selected, and a modal simulation and a kinematic simulation are performed on the automobile part to obtain the modal displacement of the automobile part under the non-rigid body mode and the corresponding modal participation factor. The modal simulation and the kinematic simulation are performed on the automobile part to obtain the modal displacement of the automobile part under the non-rigid body mode and the corresponding modal participation factor, including: obtaining the monitoring point of the automobile part, the monitoring point of the automobile part is the most dangerous node of the automobile part, and the modal simulation and the kinematic simulation are performed on the monitoring point of the automobile part to obtain the modal displacement of the monitoring point of the automobile part under the non-rigid body mode and the corresponding modal participation factor, the most dangerous node is the node with the most violent jitter or the node with the largest resonance amplitude; The modal displacement under the non-rigid mode and the corresponding modal participation factor are multiplied and superimposed to obtain the jitter displacement of the automobile parts.

2. The automobile parts jitter simulation method according to claim 1, characterized in that: The monitoring points of obtaining automobile parts include: According to the hard point load information of the whole vehicle when the vehicle is driving on a twisted road, the excitation frequency range of the external load is obtained; Perform modal simulation on automobile parts to obtain the frequencies of each mode of automobile parts; Comparing the excitation frequency range of the external load with the frequencies of each mode of the automobile part, obtaining the resonant mode of the automobile part, wherein the frequency of the resonant mode of the automobile part is within the excitation frequency range of the external load; The node corresponding to the maximum value of the modal displacement of the resonance mode of the automobile part is used as the monitoring point.

3. The automobile parts jitter simulation method according to claim 2, characterized in that: The excitation frequency range of the external load is obtained based on the hard point load information of the entire vehicle when the vehicle is driving on a twisted road, including: Perform Fourier transform on the vehicle's hard point load information in each time domain channel when the vehicle is driving on a twisted road to obtain the frequency of the load in each channel; According to the frequency of each channel load, the excitation frequency range of the external load is obtained.

4. The automobile parts vibration simulation method according to claim 1, characterized in that: The building of the whole vehicle finite element model comprises: Obtain the material and thickness information of each part of the vehicle; Build a vehicle finite element model and assign corresponding material and thickness information to each part of the vehicle finite element model; The mass information and center of mass coordinate information of the counterweight parts are collected, and the vehicle finite element model is counterweighted to obtain the finite element model of the whole vehicle.

5. The automobile parts vibration simulation method according to claim 1, characterized in that: The calculation formula of the vibration displacement of the automobile parts is as follows: ， Among them, ujitter(t) is the jitter displacement of the automobile part at time t, ξ(i) is the modal participation factor of the i-th mode of the automobile part at time t, and u i is the modal displacement of the i-th mode of the automobile part, and n is a positive integer greater than or equal to 7.

6. The automobile parts jitter simulation method according to claim 1, characterized in that: The whole vehicle hard point load information when the vehicle is driving on a twisted road is obtained through VPG simulation or virtual iterative processing of a physical prototype vehicle.

7. Automobile parts vibration simulation device, characterized in that: The device comprises: An acquisition unit is used to acquire the hard point load information of the entire vehicle when the vehicle is driving on a twisted road; Build the unit, build the finite element model of the whole vehicle, and input the hard point load information of the whole vehicle into the finite element model of the whole vehicle; The analysis unit selects the automobile parts to be simulated based on the finite element model of the whole vehicle, performs modal simulation and kinematic simulation on the automobile parts, and obtains the modal displacement of the automobile parts under the non-rigid body mode and the corresponding modal participation factor, wherein the modal simulation and kinematic simulation on the automobile parts to obtain the modal displacement of the automobile parts under the non-rigid body mode and the corresponding modal participation factor include: obtaining the monitoring point of the automobile parts, wherein the monitoring point of the automobile parts is the most dangerous node of the automobile parts, performing modal simulation and kinematic simulation on the monitoring point of the automobile parts to obtain the modal displacement of the monitoring point of the automobile parts under the non-rigid body mode and the corresponding modal participation factor, wherein the most dangerous node is the node with the most violent jitter or the node with the largest resonance amplitude; The unit is obtained, and the modal displacement under the non-rigid mode and the corresponding modal participation factor are multiplied and superimposed to obtain the jitter displacement of the automobile parts.

8. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and the computer program includes executable instructions. When the executable instructions are executed by a processor, the automobile part jitter simulation method according to any one of claims 1 to 6 is implemented.

9. An electronic device, characterized in that: include: one or more processors; A memory for storing executable instructions of the processor, wherein when the executable instructions are executed by the one or more processors, the one or more processors implement the automobile part jitter simulation method according to any one of claims 1 to 6.

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