Vehicle chassis simulation system, method, device, medium and program product

Abstract

The invention provides a vehicle chassis simulation system, method and device, a medium and a program product, through the chassis simulation system which is established and has the same data transmission format between modules, in the system, a pre-processing module obtains three-dimensional geometric data of a vehicle chassis and material parameters of all parts of the vehicle chassis, and the pre-processing module obtains the three-dimensional geometric data of the vehicle chassis and the material parameters of all the parts of the vehicle chassis based on the three-dimensional geometric data and the material parameters of all the parts of the vehicle chassis; after the analysis model is generated, the finite element analysis module performs multi-body dynamics analysis, modal analysis and fatigue analysis based on the analysis model under different chassis working conditions to obtain static and dynamic loads, modal frequencies, vibration modes and stress field distribution of all attachment points in the vehicle chassis and fatigue damage of all parts; and the post-processing module performs statistical analysis on static and dynamic loads, stress field distribution, modal frequency and vibration modes of each attachment point and fatigue damage of each part to generate and display an analysis report, so that simulation verification of the vehicle chassis can be realized, and the problems of long working link, high software cost and low research and development efficiency of simulation verification are solved.

Description

Technical Field

[0001] The present application relates to the field of simulation technology, and in particular to a vehicle chassis simulation system, method, device, medium and program product. Background Art

[0002] The key systems of smart car chassis include control arms, steering knuckles, subframes, spring shock absorbers, stabilizer bars, suspension rods and other components. The design and simulation verification system of this key system mainly follows the traditional OEM method. Among them, the OEM is the vehicle manufacturer, which usually masters the core technology of vehicle production.

[0003] The above traditional OEM method usually follows the following Figure 1 As shown in the simulation process, during the engineering data design phase, chassis system modeling and finite element modeling are first performed. Then, multi-body dynamics analysis and modal analysis are performed based on the modeling model. Strength analysis and fatigue analysis are performed based on the multi-body dynamics analysis to obtain analysis results. The analysis results are further analyzed. If they meet the requirements, the analysis is completed. If they do not meet the requirements, the analysis is performed again according to the process, so as to complete the analysis and structural optimization before the data is frozen and meet the performance target requirements of the vehicle.

[0004] When performing simulation analysis according to this process, different OEMs may use different modeling software in their simulation software systems, i.e. Figure 1 The mainstream 3D modeling software 1-mainstream 3D modeling software 3 shown in the figure is used to model the geometric model of the chassis system, and then different pre-processing software is used, namely Figure 1 The mainstream pre-processing software 1 and the mainstream pre-processing software 2 shown in the figure discretize the geometric model into a finite element model. Then, the mainstream multi-body dynamics software 1 or the optional multi-body dynamics software 2 is used to perform multi-body dynamics analysis, extract the loads of different attachment points of the chassis, and use the noise, vibration, harshness (NVH) solver to perform NVH analysis, use the strength solver to perform structural strength analysis, and use the fatigue solver to predict fatigue damage risk. After the analysis is completed, different post-processing software, such as Figure 1 The dedicated post-processing software 1-3 or the general post-processing software 4 shown performs post-processing on the analysis results.

[0005] However, for any OEM's simulation software system, since a variety of different software are used for simulation collaborative analysis, the data processing formats of different software may be different. Data format conversion is required when data is transmitted between different software, which may result in long working links and high software costs, reducing the R&D efficiency of the chassis system. Summary of the invention

[0006] Based on the defects and shortcomings of the above-mentioned prior art, the present application proposes a vehicle chassis simulation system, method, device, medium and program product. The data transmission format between the modules in the system is the same. By integrating the simulation analysis function into the pre-processing module, finite element analysis module and post-processing module, the simulation verification of the vehicle chassis is realized through the tool chain composed of each module, which solves the problems of long working chain of simulation verification, high software cost and low R&D efficiency.

[0007] According to a first aspect of the present application, a vehicle chassis simulation system is provided, the vehicle chassis simulation system comprising a pre-processing module, a finite element analysis module and a post-processing module, and the data transmission format between the modules is the same;

[0008] The pre-processing module is used to obtain three-dimensional geometric data of the vehicle chassis and material parameters of various components of the vehicle chassis, and generate an analysis model based on the three-dimensional geometric data and the material parameters, wherein the three-dimensional geometric data is used to describe the shape and structure of the vehicle chassis;

[0009] The finite element analysis module performs multi-body dynamics analysis, modal analysis, strength analysis and fatigue analysis based on the analysis model under different chassis working conditions to obtain the static load, modal frequency and vibration shape, stress field distribution and fatigue damage of each component of each attachment point in the vehicle chassis;

[0010] The post-processing module performs statistical analysis on the static load and dynamic load of each attachment point, stress field distribution, modal frequency and vibration mode, and fatigue damage of each component, generates and displays an analysis report, and the dynamic load is the static load at each moment within a preset time period.

[0011] According to a second aspect of the present application, a vehicle chassis simulation method is provided, which is applied to the vehicle chassis simulation system according to the first aspect, and the method comprises:

[0012] Acquiring three-dimensional geometric data of a vehicle chassis and material parameters of various components of the vehicle chassis, and generating an analysis model based on the three-dimensional geometric data and the material parameters, wherein the three-dimensional geometric data is used to describe the shape and structure of the vehicle chassis;

[0013] Under different chassis working conditions, multi-audiomechanical analysis, modal analysis, strength analysis and fatigue analysis are performed based on the analysis model to obtain the static load, model frequency and vibration mode, stress field distribution and fatigue damage of each component of each attachment point in the vehicle chassis;

[0014] The static load and dynamic load of each attachment point, stress field distribution, modal frequency and vibration mode, and fatigue damage of each component are statistically analyzed, and an analysis report is generated and displayed. The dynamic load is the static load at each moment in a preset time period.

[0015] According to a third aspect of the present application, a vehicle chassis simulation device is provided, which is applied to the vehicle chassis simulation system according to the first aspect, and the device comprises:

[0016] an acquisition unit, configured to acquire three-dimensional geometric data of a vehicle chassis and material parameters of various components of the vehicle chassis, and generate an analysis model based on the three-dimensional geometric data and the material parameters, wherein the three-dimensional geometric data is used to describe a shape and structure of the vehicle chassis;

[0017] An analysis unit, used for performing multi-audiology analysis, modal analysis, strength analysis and fatigue analysis based on the analysis model under different chassis working conditions to obtain static loads, model frequencies and vibration modes, stress field distribution and fatigue damage of various components at each attachment point in the vehicle chassis;

[0018] A generation unit is used to perform statistical analysis on the static load and dynamic load of each attachment point, stress field distribution, modal frequency and vibration mode, and fatigue damage of each component, generate and display an analysis report, wherein the dynamic load is the static load at each moment within a preset time period.

[0019] According to a fourth aspect of the present application, there is provided an electronic device, comprising a memory and a processor;

[0020] The memory is connected to the processor and is used to store programs;

[0021] The processor is used to implement the vehicle chassis simulation method as described in the second aspect by running the program in the memory.

[0022] According to a fifth aspect of the present application, a storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the vehicle chassis simulation method as described in the second aspect is implemented.

[0023] According to a sixth aspect of the present application, a computer program product is provided, wherein the computer program product comprises computer program instructions, and when the computer program instructions are executed by a processor, the processor is enabled to implement the vehicle chassis simulation method as described in the second aspect.

[0024] In the above-mentioned vehicle chassis simulation system, method, device, medium and program product, the vehicle chassis simulation system includes a pre-processing module, a finite element analysis module and a post-processing module, and the data transmission format between the modules is the same, wherein the pre-processing module obtains and generates an analysis model based on the three-dimensional geometric data of the vehicle chassis and the material parameters of each component of the vehicle chassis, and then the finite element analysis module performs multi-body dynamics analysis, modal analysis and fatigue analysis based on the analysis model under different chassis working conditions, and obtains the static and dynamic loads, modal frequencies and vibration shapes, stress field distribution and fatigue damage of each component of each attachment point in the vehicle chassis, and finally, the post-processing module performs statistical analysis on the static and dynamic loads, stress field distribution, modal frequencies and vibration shapes of each attachment point and fatigue damage of each component, generates an analysis report and displays it. In this way, by establishing a tool chain including the pre-processing module, the finite element analysis module and the post-processing module, the simulation verification function can be integrated into each module of the vehicle chassis simulation system with the same transmission data format, so as to realize the simulation verification of the vehicle chassis, and solve the problems of long working chain of simulation verification, high software cost and low R&D efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of a simulation process and software system of a traditional OEM method in the prior art;

[0027] Figure 2 A schematic diagram of a vehicle chassis simulation system provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of a selected connection area range provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of a vehicle design parameter table proposed in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of a driving load table proposed in an embodiment of the present application;

[0031] Figure 6 A schematic diagram of a table of static loads of various attachment points under different channels under different working conditions proposed in an embodiment of the present application;

[0032] Figure 7A schematic diagram of the distribution of the main points and hard points proposed in this embodiment;

[0033] Figure 8 A schematic diagram of a unit force of an attachment point under different dynamic loads in different channels proposed in an embodiment of the present application;

[0034] Fig. 9 A schematic diagram of a process flow of a vehicle chassis simulation method proposed in an embodiment of the present application;

[0035] Fig.10 A schematic diagram of the structure of a vehicle chassis simulation device proposed in an embodiment of the present application;

[0036] Fig.11 A schematic diagram of the structure of an electronic device proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0037] 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.

[0038] Overview

[0039] As described in the background technology, for any OEM's simulation software system, since a variety of different software are used for simulation collaborative analysis, the data processing formats of different software may be different. Data format conversion is required when data is transmitted between different software, which may result in long working links and high software costs, reducing the R&D efficiency of the chassis system.

[0040] On this basis, the inventors found through further research that the vehicle chassis simulation system includes a pre-processing module, a finite element analysis module and a post-processing module, and the data transmission format between the modules is the same, wherein the pre-processing module obtains and generates an analysis model based on the three-dimensional geometric data of the vehicle chassis and the material parameters of each component of the vehicle chassis, and then the finite element analysis module performs multi-body dynamics analysis, modal analysis and fatigue analysis based on the analysis model under different chassis working conditions, and obtains the static and dynamic loads, modal frequencies and vibration shapes, stress field distribution and fatigue damage of each component of each attachment point in the vehicle chassis, and finally, the post-processing module performs statistical analysis on the static and dynamic loads, stress field distribution, modal frequencies and vibration shapes of each attachment point and fatigue damage of each component, generates an analysis report and displays it. In this way, by establishing a tool chain including a pre-processing module, a finite element analysis module and a post-processing module, the simulation verification function can be integrated into each module of the vehicle chassis simulation system with the same transmission data format, so as to realize the simulation verification of the vehicle chassis and solve the problems of long working chain of simulation verification, high software cost and low R&D efficiency.

[0041] Based on the above concept, an embodiment of the present specification provides a vehicle chassis simulation system, which will be described exemplarily in conjunction with the accompanying drawings.

[0042] Exemplary Systems

[0043] See also Figure 2 In an exemplary embodiment, a vehicle chassis simulation system is provided, such as Figure 2 As shown, the vehicle chassis simulation system includes a pre-processing module, a finite element analysis module and a post-processing module, and the data transmission format between the modules is the same.

[0044] The pre-processing module is used to obtain the three-dimensional geometric data of the vehicle chassis and the material parameters of each component of the vehicle chassis, and generate an analysis model based on the three-dimensional geometric data and the material parameters. The three-dimensional geometric data is used to describe the shape and structure of the vehicle chassis.

[0045] Specifically, the pre-processing module includes a geometric data interface, which is used to obtain three-dimensional geometric data. The three-dimensional geometric data is used to describe the overall shape of the vehicle chassis and the position and shape of each component in the vehicle chassis.

[0046] The pre-processing module also includes a material library, which is used to obtain the material parameters of each component of the vehicle chassis, that is, to define the parameters of the materials used for each component of the vehicle chassis, including the material name and the physical properties of the material. The physical properties of the material include elastic modulus, Poisson's ratio, density and yield strength.

[0047] The pre-processing module obtains the three-dimensional geometric data of the vehicle chassis and the material parameters of each component of the vehicle chassis, converts the data format into a dedicated data format of the chassis simulation system, and then generates an analysis model based on the acquired data.

[0048] The analysis model includes each mesh model and the three-dimensional geometric data and material parameters of the corresponding mesh parts.

[0049] like Figure 2 As shown, the pre-processing module may also include a finite element file interface for obtaining the calculation file of the finite element software and converting all the data obtained by the pre-processing module into a special data format for the chassis simulation system. The data in the calculation file may replace or be combined with the above-mentioned three-dimensional geometric data to perform mesh solving.

[0050] Afterwards, the finite element analysis module is used to perform multi-body dynamics analysis, modal analysis, strength analysis and fatigue analysis based on the analysis model under different chassis working conditions to obtain the static load, modal frequency and vibration shape, stress field distribution and fatigue damage of each component at each attachment point in the vehicle chassis.

[0051] That is, the finite element analysis module performs multi-body dynamics analysis based on the analysis model under different chassis working conditions to obtain the static load of each attachment point in the vehicle chassis; performs modal analysis based on the analysis model under different chassis working conditions to obtain the modal frequency and vibration shape of the analysis model; performs strength analysis based on the analysis model under different chassis working conditions to obtain the stress field distribution in the vehicle chassis; performs fatigue analysis based on the analysis model under different chassis working conditions to obtain the fatigue damage of each component in the vehicle chassis.

[0052] Among them, the chassis working condition is the static load decomposition condition of the suspension. There are many types of working conditions. Generally, the inspection conditions of the chassis of passenger cars include more than 10 types, including conventional working conditions and extreme working conditions. Conventional working conditions refer to the situations encountered by the vehicle during daily driving, including acceleration, braking, turning, and highways on urban roads, speed bumps, and ordinary potholes. The vehicle usually works within the normal design parameter design range. Extreme working conditions refer to the vehicle experiencing extreme environments or usage conditions, such as overloading, high-speed pits, high-speed bumps, emergency braking, rushing onto the edge of the road at a high speed, and other similar situations, which may cause certain impacts or challenges to the strength and durability of the vehicle. Unconventional situations.

[0053] In addition, for the load-bearing body in which the chassis and body are integrated into one vehicle, and the non-load-bearing body in which the body and chassis are independent components, the vehicle chassis needs to examine more than 10 types of front and rear suspension components, and the number of chassis attachment points generally exceeds 40.

[0054] The attachment point is where the body is flexibly or rigidly connected to the suspension system or powertrain. Each attachment point has 6 load channels, where the load is decomposed from the mechanical three-dimensional coordinate system, including three forces (X, Y, Z) and three moments (RX, RY, RZ), the so-called 6 load channels. It is understandable that any force in three-dimensional space can be decomposed into 6 directional loads, and decomposing it into 6 loads can make it easier to study the load characteristics of the structure.

[0055] Among them, the static loads of each attachment point in the vehicle chassis, including all channel loads of the attachment points of each component of the vehicle chassis under each working condition, can be exported in tabular form.

[0056] The post-processing module is used to perform statistical analysis on the static and dynamic loads of each attachment point, stress field distribution, modal frequency and vibration mode, and fatigue damage of each component, generate and display an analysis report, and the dynamic load is the static load at each moment within a preset time period.

[0057] It can be understood that both the pre-processing module and the post-processing module support the import of general finite element file formats and model restoration. The pre-processing module supports interactive and efficient modeling of analysis models, and efficient batch error checking and correction of models. The post-processing module supports batch load data and result data analysis and processing, and a streamlined one-button start of strength and durability analysis submission and post-processing report generation functions.

[0058] In this embodiment, the vehicle chassis simulation system includes a pre-processing module, a finite element analysis module and a post-processing module, and the data transmission format between the modules is the same, wherein the pre-processing module obtains and generates an analysis model based on the three-dimensional geometric data of the vehicle chassis and the material parameters of each component of the vehicle chassis, and then the finite element analysis module performs multi-body dynamics analysis, modal analysis and fatigue analysis based on the analysis model under different chassis working conditions, and obtains the static and dynamic loads, modal frequencies and vibration shapes, stress field distribution and fatigue damage of each component of each attachment point in the vehicle chassis, and finally, the post-processing module performs statistical analysis on the static and dynamic loads, stress field distribution, modal frequencies and vibration shapes of each attachment point and fatigue damage of each component, generates an analysis report and displays it. In this way, by establishing a tool chain including the pre-processing module, the finite element analysis module and the post-processing module, the simulation verification function can be integrated into each module of the vehicle chassis simulation system with the same transmission data format, so as to realize the simulation verification of the vehicle chassis, and solve the problems of long working chain of simulation verification, high software cost and low R&D efficiency.

[0059] In order to ensure the accuracy of the analysis model solution, or to ensure the accuracy of the analysis model, in some embodiments, the pre-processing module also includes a mesh solver and a functional module. When the pre-processing module generates the analysis model based on the three-dimensional geometric data and material parameters, the mesh solver is used to perform geometric cleaning and repair on the three-dimensional geometric data and material parameters. Thereafter, based on the preset mesh solving rules and material parameters, the surface corresponding to the three-dimensional geometric data is meshed to obtain a mesh model. In addition, the functional module is used to connect the various components of the vehicle chassis in the mesh model, and perform mesh inspection and analysis settings to obtain the analysis model.

[0060] Among them, mesh checking is to detect the rationality of the mesh model, and analysis setting is to set the relevant parameters of the simulation analysis, that is, to set the parameters for strength analysis, fatigue analysis, modal analysis, and multi-dynamic analysis of the analysis model.

[0061] Specifically, the mesh solver predefines the mesh density and unit type, and generates the corresponding unit type according to the topological structure of the geometric model. Mesh generation needs to select the corresponding mesh solving strategy according to the mesh requirements to generate a finite element mesh model.

[0062] More specifically, the data is firstly extracted to obtain the corresponding surface, and then the surface is meshed based on the mesh solution strategy to quickly generate a mesh model that meets the analysis standards.

[0063] Among them, mid-surface extraction refers to extracting the middle layer of a three-dimensional solid model (such as sheet metal, shell, etc.) with a certain thickness through a specific tool or algorithm to form a two-dimensional surface. This surface usually represents the middle layer or average thickness layer of the model, which is used for subsequent mesh solution, finite element analysis or other simulation analysis.

[0064] like Figure 2 As shown, the pre-processing module also includes a mesh checking part. After the mesh model is determined, a mesh check is performed on the generated mesh model to ensure that the determined mesh model complies with the preset mesh solving rules.

[0065] In this way, for the creation of the analysis model, the finite element mesh of each component is established first. The modeling has strict mesh parameters and quality standards. Modeling generally takes up more than 60% of the time for strength analysis, and the mesh quality determines the convergence of the model. It is of great significance to ensure that the determined mesh model conforms to the preset mesh solution rules, which can effectively guarantee the accuracy and reliability of the final generated analysis model.

[0066] The functional module connects the components of the vehicle chassis in the mesh model. When the analysis model is obtained, the connection of chassis system components is usually completed interactively through the functional module, including bolt connections, welding points, welds, and fast connections of rigid and flexible units. In addition, the contact model can also be quickly generated interactively, avoiding the manual definition of master and slave surface geometry and parameter setting process.

[0067] For example, Figure 3 As shown, through interactive buttons, engineers only need to indicate Figure 3 The connection area shown in the figure is the area encircled by the white circle, which can realize fast and accurate connection of the attachment points.

[0068] In other words, users, such as engineers, only need to specify two parts or multiple groups of parts, and the pre-processing module can automatically generate a contact model. In the process of generating a contact model, the common operations such as specifying parts, defining contact master and slave surfaces between parts, defining the model as binding or friction sliding, corresponding to different friction models, and defining friction coefficients are developed into process-based operations. At this point, users can automatically generate connections and finally generate a contact model through simple interactions, which can effectively avoid manual setup operations in the middle.

[0069] For the contact model, the design distance and contact parameters between the chassis components are in line with certain specifications. By analyzing the equipment, these parameter requirements are pre-defined in the pre-processing module, which can help engineers quickly realize the connection of contact simulation.

[0070] The functional module is also used to define and implement automatic geometry cleanup functions, automatic loading functions, fast meshing of geometric features, automatic naming functions, etc.

[0071] Analysis settings, that is, define (i.e. set) related boundaries, constraints and parameters. For example, the modal calculation part needs to define the method of extracting modal frequencies, orders, etc., statics needs to set iteration methods such as Newton's method, modified Newton's method, etc., model calculation convergence standards such as displacement, force, energy, etc. Convergence tolerance, and load calculation method, etc. You can also define model loads and constraints, initial calculation conditions, and define output results, such as output variables including stress, strain, displacement, output frequency, output result time point, etc.

[0072] The finite element analysis module can select different simulation functions based on user needs to perform corresponding multi-body dynamics analysis, modal analysis, strength analysis, and fatigue analysis. Based on the different simulation analysis functions selected, the functions in the general solver are called.

[0073] In this embodiment, in the pre-processing module, a mesh solver is used to mesh the surface corresponding to the three-dimensional geometric data based on preset mesh solving rules and material parameters to obtain a mesh model, and the various components of the vehicle chassis in the mesh model are connected through the functional module to obtain an analysis model. In this way, based on the strict mesh parameters and quality standards established based on the finite element mesh model, an accurate analysis model with good convergence can be obtained based on the mesh model, thereby obtaining accurate analysis results.

[0074] In order to achieve efficient and automated processing of the loads of various chassis components, in some embodiments, the three-dimensional geometric data includes vehicle design parameters, the finite element analysis module includes a multi-body dynamics analysis module, and the multi-body dynamics analysis is performed based on the analysis model to obtain the static load of each attachment point in the vehicle chassis. The multi-body dynamics analysis module is used to determine the driving loads of different channels of the front and rear suspensions of the vehicle chassis under different chassis working condition templates based on the vehicle design parameters, the analysis model and different chassis working condition templates, apply the driving loads to the target positions of the front and rear wheels, and perform working condition simulation based on the multi-body dynamics model to calculate the static loads of each channel of each attachment point under different chassis working condition templates in turn.

[0075] For example, the vehicle design parameters may be stored in Figure 4 In the table shown, the items or parameters include fully loaded gross mass, fully loaded front axle load, fully loaded rear axle load, wheelbase, front track, rear track, fully loaded center of mass height of the vehicle, distance from center of mass to front axle, distance from center of mass to rear axle, front axle center of mass height, rear axle center of mass height, ground adhesion coefficient, acceleration of gravity and other parameters. The table also stores the code, unit, value, etc. of each parameter. If a parameter has no code, unit, or value, the corresponding position can be left blank. Of course, based on different actual needs, other parameters can be added to the table or some parameters in the table can be deleted.

[0076] Based on the chassis structure, including the suspension system, transmission system, brake system, etc., the chassis working condition includes the suspension system working condition, the transmission system working condition and the brake system working condition. Among them, the suspension system working condition is the main component of the chassis working condition. Therefore, the chassis working condition can be determined based on the suspension system working condition.

[0077] For example, the chassis operating conditions may be represented in a tabular form, including the accelerations of the left and right wheels of the front and rear suspension vehicles on different channels.

[0078] The target position is a position such as the wheel core or the tire contact point.

[0079] For example, the determined driving loads of each channel of the left and right wheels of the front and rear suspension under different chassis working condition templates can be stored in Figure 5The table shown includes the static loads of the attachment points of the left wheel and the right wheel of the front suspension (Fron suspension) on different channels (Fx, Fy, Fz channels) under working conditions 01-working conditions 10, and the static loads of the attachment points of the left and right wheels of the rear suspension (Rear suspension) on different channels under working conditions 01-working conditions 10.

[0080] For example, the load of each channel at each attachment point under different chassis working condition templates can be as follows: Figure 6 As shown, the working conditions include case1-case10, and the hard point position coordinates are the position coordinates of the attachment point.

[0081] The position coordinates of each attachment point may be directly acquired by the pre-processing module, or may be obtained after adjustment based on the hard point position.

[0082] For example, Figure 7 As shown, after determining the initial position of the attachment point, Figure 7 The main point position of the black point shown in the figure adopts the radius search method to search for hard points within its radius. Figure 7 If the hollow point shown is a hard point, the coordinates of the position of the hollow point, that is, the hard point coordinates, are determined as the coordinates of the position of the attachment point.

[0083] Among them, the principal point is the key point or center point on the attachment point, which can represent the position and direction of the attachment point load. In multi-body dynamics modeling, the hard point (also called the design point) is the reference position point for creating component definitions. It can be the contour reference point of the geometric shape or the positioning point for the assembly position and movement of the component. The coordinates of the hard point define the position of the rigid body in the global coordinate system.

[0084] In addition, the above chassis operating conditions can also be customized by users based on their corporate standards.

[0085] Specifically, based on the pre-provided suspension static load condition template, that is, the above-mentioned chassis condition template, after entering the vehicle parameters, the suspension driving load is automatically generated, and the load preview effect check is supported. After that, the load analysis is started with one click. After the analysis is completed, the load results of different channels under specified or all conditions, that is, static loads, can be exported in batches to facilitate load level research or project calculations.

[0086] In this embodiment, based on the design parameters of the whole vehicle, the analysis model and different chassis working condition templates, the driving loads of different channels of the front and rear suspensions under different chassis working condition templates are determined, and the driving loads are applied to the target positions of the front and rear wheels, and the working condition simulation is performed based on the multi-body dynamics model, and the static loads of each channel of each attachment point under different chassis working condition templates are calculated in turn. When performing virtual load prediction, for the calculation working condition of the suspension load, a one-click batch export function can be implemented through batching, customized templates, and result export, thereby avoiding errors and inefficiency caused by manual processing, and realizing efficient and automated processing of chassis load analysis, so that engineers have more time to study the characteristics and laws of chassis loads.

[0087] In some cases, the different channels of loads can be given standardized names and assigned keywords, which can serve as a basis for automating the strength calculation process.

[0088] In order to achieve efficient and automated processing of the modes of various chassis components, in some embodiments, the finite element analysis module includes a modal analysis module. When performing modal analysis based on the analysis model to obtain the modal frequency and vibration shape of the analysis model, the modal analysis module is used to call the modal solver to perform modal analysis on the analysis model in sequence to identify the modal frequency and vibration shape.

[0089] Specifically, based on the modal parameter settings at the component and suspension levels, the modal analysis module is used to call the modal solver to perform modal analysis on the analysis model to obtain the modal frequency and vibration shape of each component.

[0090] Among them, modal parameters include methods for extracting modal frequencies, orders, etc.

[0091] Thus, in this embodiment, the modal analysis module calls the modal solver to perform modal analysis on the analysis model in sequence, identify the modal frequency and vibration mode, and realize batch analysis of the static frequency and vibration mode of each component, thereby realizing efficient and automated processing of chassis modal analysis.

[0092] In order to achieve efficient and automated processing of the strength of each chassis component, in some embodiments, the finite element analysis module includes a strength analysis module. When performing strength analysis based on the analysis model to obtain the stress field distribution of each component in the vehicle chassis, the strength analysis module is used to call the strength solver to perform strength analysis on the analysis model in turn based on the static load of each channel at each attachment point under different chassis working condition templates to obtain the stress field distribution of each component.

[0093] The strength analysis module is used to call the strength solver to submit the static loads of each channel of each attachment point under different chassis working condition templates to the strength analysis model in batches to obtain the stress field distribution of each component.

[0094] Based on the coordinates of the attachment points of each component, the multi-condition static loads imported from the multi-body kinematic analysis module are attached to the corresponding attachment points, and different strength analysis steps are set to perform solution calculations to obtain the stress field distribution of each attachment point of each component.

[0095] Specifically, the strength analysis module is used to complete one-click submission calculations through analysis models and static load files to obtain the stress field distribution of each component. Among them, the static load file includes the loads of each attachment point in different channels under different working conditions. The pre-processing module performs geometric cleaning and generation through mesh parameter and quality parameter file control, and generates a mesh model that meets the analysis standards represented by the mesh parameter setting quality parameter file through the mesh solver. The user needs to click on the corresponding functional module to interact and complete the model connection of each component in the initial chassis. The connection method is such as bolt connection, rigid unit connection, flexible unit connection, etc., to generate an analysis model. According to the attachment point coordinates of the static load file, channel matching is completed, batch loading is used to form an analysis model for strength analysis, and the general solver is submitted for calculation to obtain the stress field distribution at each attachment point of each component.

[0096] In this embodiment, the strength analysis module is used to call the strength solver, and based on the static loads of each channel at each attachment point under different chassis working condition templates, the analysis model is subjected to modal analysis in turn to obtain the stress field distribution of each component. When the connection between the components and the coordinates of each attachment point are known, the static loads are batch-attached to the corresponding analysis model, so that the required analysis model can be completed quickly and the strength analysis can be performed, thereby avoiding repetitive work of manual processing and loading, reducing human subjective errors, and completing the strength analysis efficiently and conveniently.

[0097] In order to achieve efficient and automated processing of fatigue analysis of various chassis components, in some embodiments, the finite element analysis module includes a fatigue analysis module. When performing fatigue analysis based on the analysis model to obtain fatigue damage of each component, the fatigue analysis module is used to generate unit forces of various components of the vehicle chassis in different channels based on the dynamic loads of each channel at each attachment point under different chassis working condition templates, and based on the unit forces of each component in different channels, call the fatigue solver to perform fatigue analysis on each component in turn to obtain fatigue damage of each component.

[0098] The fatigue analysis module is used to load the dynamic loads of each channel of each attachment point under different chassis working condition templates into the corresponding attachment point channel of the analysis model to obtain the fatigue analysis model, determine the unit force of each component in the chassis, load the unit force into the fatigue analysis model, combine the material fatigue characteristic curve, complete the channel mapping of the fatigue analysis model, call the fatigue solver, complete the fatigue analysis, and obtain the fatigue damage of each component.

[0099] For example, the fatigue analysis of the vehicle chassis generally adopts the quasi-static method, and the unit force model adopts the inertia release method. The unit force model of each component needs to be established in the fatigue analysis. In this process, the fatigue analysis module needs to complete the load and material mapping, and match the attachment point coordinates or hard point coordinates, working condition sequence and road spectrum excitation load channel one by one to ensure the accuracy of the fatigue results.

[0100] Specifically, the fatigue analysis module in the chassis simulation system performs channel mapping through unit stress field results and dynamic load files, and completes structural fatigue analysis in combination with material fatigue characteristic curves. Among them, the stress field results require the construction of a unit force model, and all channels of each attachment point in each unit force model need to establish working conditions. When the user generates unit force, based on the strength model, the load is refreshed in batches to unit force, and each channel of each attachment point is reset to generate a multi-condition model to meet the needs of fatigue analysis.

[0101] For example, the unit force at the attachment point under different dynamic loads in different channels can be as follows: Figure 8 shown.

[0102] In this embodiment, the fatigue analysis module is used to generate unit forces of various components of the vehicle chassis in different channels based on the dynamic loads of each channel at each attachment point under different chassis working condition templates, and based on the unit forces of each component in different channels, the fatigue solver is called to perform fatigue analysis on each component in turn to obtain fatigue damage of each component. The unit force model of the vehicle chassis can be batch created through the dynamic loads of each attachment point, and the channels can be fused one-to-one with the dynamic loads. Compared with manual modification of loads and matching of load channels, this embodiment can better avoid errors caused by human subjectivity and complete fatigue analysis results efficiently and conveniently.

[0103] After simulating and analyzing the vehicle chassis through the finite element analysis module, an analysis report can be generated for the loads, model frequencies and vibration modes, stress field distribution, and fatigue damage obtained from the multi-body dynamic kinematics analysis, and the design of the vehicle chassis can be iteratively optimized based on the analysis report.

[0104] like Figure 2 As shown, after being analyzed by the finite element analysis module, the analysis results are exported to the post-processing module. The post-processing module reads the result files obtained by the finite element analysis module, including static and dynamic loads, stress distribution, modal frequency and vibration mode, damage distribution, etc., and visualizes the read results in the form of graphs / tables / curves, animated images / videos. The read content can also be displayed or hidden based on actual needs. The post-processing module is also used to analyze the read results, perform mathematical operations, quick plug-ins and report generation, so as to fully understand the analysis results.

[0105] Compared with the prior art, which uses different simulation software systems to virtually verify the performance of chassis systems separately, that is, it is necessary to complete virtual simulation in different software systems, and transmit data and analyze the results through software standard interfaces. This application proposes to establish a series of interrelated software tools and technologies such as a computer-aided engineering (CAE) tool chain to provide support in the engineering and analysis process, including pre-processing, finite element analysis and post-processing. Pre-processing includes modeling, parametric design, unit segmentation, input of loads and material parameters, etc. Finite element analysis involves numerical simulation and analysis of the structural mechanical properties of engineering or products, and can handle dynamic and static problems and linear and nonlinear problems. Post-processing processes and visualizes the analysis results to help relevant personnel understand and interpret the calculation results, and evaluate and optimize the design scheme, thereby realizing the integration of chassis system design-simulation virtual verification process, solving the problem of long R&D simulation software link, avoiding technical barriers to cross-software data interaction, reducing compatibility issues of different software, and avoiding the risk of being restricted by international software technology.

[0106] Exemplary Methods

[0107] See also Fig. 9 In an exemplary embodiment, a vehicle chassis simulation method is provided, which is applied to the above-mentioned embodiment. Figure 2 The vehicle chassis simulation system shown in the figure. Fig. 9 As shown, the vehicle chassis simulation method includes steps S901-S903:

[0108] S901: Acquire three-dimensional geometric data of a vehicle chassis and material parameters of various components of the vehicle chassis, and generate an analysis model based on the three-dimensional geometric data and the material parameters.

[0109] S902: Under different chassis working conditions, multi-body dynamics analysis, modal analysis, strength analysis and fatigue analysis are performed based on the analysis model to obtain the static load, modal frequency and vibration shape, stress field distribution of each attachment point in the vehicle chassis and fatigue damage of each component.

[0110] S903: Perform statistical analysis on the static load and dynamic load of each attachment point, stress field distribution, modal frequency and vibration mode, and fatigue damage of each component, generate and display the analysis report.

[0111] The dynamic load refers to the static load at each moment within a preset time period.

[0112] The specific implementation of step S901 to step S903 can be found in the introduction of the above embodiment, which will not be described in detail here.

[0113] In this embodiment, after obtaining and generating an analysis model based on the three-dimensional geometric data of the vehicle chassis and the material parameters of each component of the vehicle chassis, multi-body dynamics analysis, modal analysis and fatigue analysis are performed based on the analysis model under different chassis working conditions to obtain the static and dynamic loads, modal frequencies and vibration modes, stress field distribution of each attachment point and fatigue damage of each component. The static and dynamic loads, stress field distribution, modal frequencies and vibration modes of each attachment point and the fatigue damage of each component are statistically analyzed to generate an analysis report and display it, which can realize simulation verification of the vehicle chassis and solve the problems of long working chain of simulation verification, high software cost and low R&D efficiency.

[0114] Exemplary Devices

[0115] like Fig.10 As shown, an embodiment of the present application further provides a vehicle chassis simulation device, including an acquisition unit 1001 , an analysis unit 1002 and a generation unit 1003 .

[0116] in,

[0117] An acquisition unit 1001 is used to acquire three-dimensional geometric data of a vehicle chassis and material parameters of various components of the vehicle chassis, and generate an analysis model based on the three-dimensional geometric data and the material parameters, wherein the three-dimensional geometric data is used to describe the shape and structure of the vehicle chassis;

[0118] The analysis unit 1002 is used to perform multi-audiology analysis, modal analysis, strength analysis and fatigue analysis based on the analysis model under different chassis working conditions to obtain the static load, model frequency and vibration mode, stress field distribution and fatigue damage of each component of each attachment point in the vehicle chassis;

[0119] The generating unit 1003 is used to perform statistical analysis on the static load and dynamic load of each attachment point, stress field distribution, modal frequency and vibration mode, and fatigue damage of each component, generate and display an analysis report, wherein the dynamic load is the static load at each moment in a preset time period.

[0120] The vehicle chassis simulation device provided in this embodiment belongs to the same application concept as the vehicle chassis simulation method provided in the above embodiments of this application, and can execute the method provided in any of the above embodiments of this application, and has the corresponding functional modules and beneficial effects of the execution method. For the technical details not fully described in this embodiment, please refer to the specific processing content of the vehicle chassis simulation method provided in the above embodiments of this application, and will not be repeated here.

[0121] The functions implemented by the above acquisition unit 1001, analysis unit 1002 and generation unit 1003 can be implemented in the form of software called by the same or different processors, and the embodiments of the present application are not limited thereto.

[0122] Exemplary Electronic Devices

[0123] Another embodiment of the present application also provides an electronic device, see Fig.11 As shown, the electronic device includes: a memory 1100 and a processor 1110 .

[0124] The memory 1100 is connected to the processor 1110 and is used to store programs;

[0125] The processor 1110 is used to implement the vehicle chassis simulation method disclosed in any of the above embodiments by running the program stored in the memory 1100.

[0126] Specifically, the electronic device may further include: a bus, a communication interface 1120 , an input device 1130 and an output device 1140 .

[0127] The processor 1110, the memory 1100, the communication interface 1120, the input device 1130 and the output device 1140 are connected to each other via a bus.

[0128] A bus may include a pathway that transfers information between components of a computer system.

[0129] The processor 1110 may be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application. It may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0130] The processor 1110 may include a main processor, and may also include a baseband chip, a modem, and the like.

[0131] The memory 1100 stores a program for executing the technical solution of the present application, and may also store an operating system and other key services. Specifically, the program may include a program code, and the program code includes a computer operation instruction. More specifically, the memory 1100 may include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk storage, a flash, and the like.

[0132] The input device 1130 may include a device for receiving data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a light pen, a voice input device, a touch screen, a pedometer, or a gravity sensor.

[0133] Output device 1140 may include devices that allow information to be output to a user, such as a display screen, printer, speaker, etc.

[0134] The communication interface 1120 may include any transceiver or the like to communicate with other devices or communication networks, such as Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc.

[0135] The processor 1110 executes the program stored in the memory 1100 and calls other devices, which can be used to implement each step of any vehicle chassis simulation method provided in the above embodiments of the present application.

[0136] Those skilled in the art will understand that Fig.11 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0137] An embodiment of the present application also proposes a chip, which includes a processor and a data interface. The processor reads and runs a program stored in a memory through the data interface to execute the vehicle chassis simulation method introduced in any of the above embodiments. The specific processing process and its beneficial effects can be found in the introduction to the embodiment of the above-mentioned vehicle chassis simulation method.

[0138] In addition to the above-mentioned methods and devices, an embodiment of the present application proposes a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the vehicle chassis simulation method according to various embodiments of the present application described in the above-mentioned "Exemplary Method" section of this specification.

[0139] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0140] In addition, an embodiment of the present application further proposes a storage medium on which a computer program is stored, and the computer program is executed by a processor to execute the steps of the vehicle chassis simulation method according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0141] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0142] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0143] It should also be noted that in the device, apparatus and method of the present invention, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present invention.

[0144] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0145] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present invention are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present invention.

[0146] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A vehicle chassis simulation system, characterized in that: The vehicle chassis simulation system includes a pre-processing module, a finite element analysis module and a post-processing module, and the data transmission format between the modules is the same; wherein, The pre-processing module is used to obtain three-dimensional geometric data of the vehicle chassis and material parameters of various components of the vehicle chassis, and generate an analysis model based on the three-dimensional geometric data and the material parameters, wherein the three-dimensional geometric data is used to describe the shape and structure of the vehicle chassis; The finite element analysis module is used to perform multi-body dynamics analysis, modal analysis, strength analysis and fatigue analysis based on the analysis model under different chassis working conditions to obtain the static load, modal frequency and vibration shape, stress field distribution and fatigue damage of each component of each attachment point in the vehicle chassis; The post-processing module is used to perform statistical analysis on the static load and dynamic load of each attachment point, stress field distribution, modal frequency and vibration mode, and fatigue damage of each component, generate and display an analysis report, and the dynamic load is the static load at each moment within a preset time period.

2. The vehicle chassis simulation system according to claim 1, characterized in that: The pre-processing module includes a mesh solver and a functional module, and the generating of the analysis model based on the three-dimensional geometric data and the material parameters includes: The mesh solver performs geometric cleaning and repair on the three-dimensional geometric data and the material parameters, and performs mesh solving on the surface corresponding to the three-dimensional geometric data based on preset mesh solving rules and the material parameters to obtain a mesh model; The functional module connects the components of the vehicle chassis in the grid model, and performs grid inspection and analysis settings to obtain the analysis model. The grid inspection is to detect the rationality of the grid model, and the analysis settings are to set relevant parameters for simulation analysis.

3. The vehicle chassis simulation system according to claim 1, characterized in that: The three-dimensional geometric data includes vehicle design parameters, and the finite element analysis module includes a multi-body dynamics analysis module. The multi-body dynamics analysis is performed based on the analysis model to obtain the static load of each attachment point in the vehicle chassis, including: The multi-body dynamics analysis module is used to determine the driving loads of different channels of the front and rear suspensions of the vehicle chassis under different chassis working condition templates based on the vehicle design parameters, the analysis model and different chassis working condition templates, apply the driving loads to the target positions of the front and rear wheels, and perform working condition simulation based on the multi-body dynamics model, and calculate the static loads of each channel of each attachment point under different chassis working condition templates in turn.

4. The vehicle chassis simulation system according to claim 1, characterized in that: The finite element analysis module includes a modal analysis module, which performs modal analysis based on the analysis model to obtain the modal frequency and vibration shape of the analysis model, including: The modal analysis module is used to call the modal solver to perform modal analysis on the analysis model in sequence and identify the modal frequency and vibration shape.

5. The vehicle chassis simulation system according to claim 1, characterized in that: The finite element analysis module includes a strength analysis module, which performs strength analysis based on the analysis model to obtain the stress field distribution of each component in the vehicle chassis, including: The strength analysis module is used to call the strength solver, and based on the static loads of each channel at each attachment point under different chassis working condition templates, perform strength analysis on the analysis model in sequence to obtain the stress field distribution of each component.

6. The vehicle chassis simulation system according to claim 1, characterized in that: The finite element analysis module includes a fatigue analysis module, which performs fatigue analysis based on the analysis model to obtain fatigue damage of each component, including: The fatigue analysis module is used to generate unit forces of various components of the vehicle chassis in different channels based on the dynamic loads of various attachment points under different chassis working condition templates, and based on the unit forces of various components in different channels, call a fatigue solver to perform fatigue analysis on each component in turn to obtain fatigue damage of each component.

7. A vehicle chassis simulation method, characterized in that: Applied in the vehicle chassis simulation system according to any one of claims 1 to 6, the method comprises: Acquiring three-dimensional geometric data of a vehicle chassis and material parameters of various components of the vehicle chassis, and generating an analysis model based on the three-dimensional geometric data and the material parameters, wherein the three-dimensional geometric data is used to describe the shape and structure of the vehicle chassis; Under different chassis working conditions, multi-audiomechanical analysis, modal analysis, strength analysis and fatigue analysis are performed based on the analysis model to obtain the static load, model frequency and vibration mode, stress field distribution and fatigue damage of each component of each attachment point in the vehicle chassis; The static load and dynamic load of each attachment point, stress field distribution, modal frequency and vibration mode, and fatigue damage of each component are statistically analyzed, and an analysis report is generated and displayed. The dynamic load is the static load at each moment in a preset time period.

8. An electronic device, characterized in that: including memory and processor; The memory is connected to the processor and is used to store programs; The processor is used to implement the vehicle chassis simulation method as claimed in claim 7 by running the program in the memory.

9. A storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by the processor, the vehicle chassis simulation method as claimed in claim 7 is implemented.

10. A computer program product, characterized in that The method comprises computer program instructions, which, when executed by a processor, enable the processor to implement the vehicle chassis simulation method as claimed in claim 7.

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