Vehicle rolling simulation method, vehicle safety determination method and related equipment

Abstract

The invention discloses a vehicle rolling simulation method, which comprises the following steps: constructing a finite element model of a vehicle, and outputting a flexible body file of the finite element model of the vehicle; based on the flexible body file, constructing an original vehicle dynamics model, and refining the original vehicle dynamics model to obtain a target vehicle dynamics model; a rack grid model used for vehicle rolling is established, and a virtual test field used for vehicle rolling is established based on the rack grid model; and in the virtual test field, simulating the target vehicle dynamic model to obtain position state parameters of the vehicle. The invention further discloses electronic equipment and a storage medium. According to the invention, low-cost, high-efficiency and high-precision whole vehicle simulation is realized.

Description

Technical Field

[0001] The embodiments disclosed in the present application relate to the field of vehicle simulation technology, and more specifically, to a vehicle rollover simulation method, a vehicle safety determination method and related equipment. Background Art

[0002] The active and passive safety of automobiles is an important performance indicator in the process of automobile design and development. Although the incidence of automobile rollover accidents is not as high as head-on collisions, side collisions and rear-end collisions, the mortality rate of rollover accidents is very high. Therefore, when the vehicle rolls over, the key to the development of passive safety performance is that the airbag can be detonated in time to protect the safety of the occupants. Summary of the invention

[0003] According to the embodiments of the present application, the present application proposes a vehicle rollover simulation method, a vehicle safety determination method and related equipment to solve the above-mentioned problems.

[0004] The first aspect of the present application discloses a vehicle rollover simulation method, comprising: constructing a finite element model of a vehicle and outputting a flexible body file of the finite element model of the vehicle; constructing an original vehicle dynamics model based on the flexible body file, and refining the original vehicle dynamics model to obtain a target vehicle dynamics model; establishing a test bench mesh model for vehicle rollover, and building a virtual test field for vehicle rollover based on the test bench mesh model; simulating the target vehicle dynamics model in the virtual test field to obtain the position state parameters of the vehicle.

[0005] In some embodiments, constructing the original vehicle dynamics model based on the flexible body file includes: importing the flexible body file into a vehicle dynamics model template, determining the connection relationship between flexible bodies to obtain at least one subsystem; assembling the original vehicle dynamics model based on the at least one subsystem, wherein the original vehicle dynamics model includes a simulation signal acquisition channel set at a preset position point of the vehicle.

[0006] In some embodiments, the refining of the original vehicle dynamics model includes: refining the bushing stiffness of the target rod in the original vehicle dynamics model to obtain a processed bushing stiffness curve, so that the processed bushing stiffness curve is consistent with the actual structure.

[0007] In some embodiments, the refinement of the original vehicle dynamics model further includes: performing a structural flexible deformation simulation on the preset position point to obtain a bushing stiffness curve of the preset position point, wherein the linear segment of the bushing stiffness curve of the preset position point is used to simulate the structural elastic deformation stage, and the nonlinear segment of the bushing stiffness curve of the preset position point is used to simulate the structural plastic deformation stage.

[0008] In some embodiments, the finite element model of the vehicle includes at least one of the following: a body finite element model, a front and rear suspension swing arm finite element model, a stabilizer bar finite element model, a subframe finite element model, and a finite element model of a suspension rod that meets a first preset condition.

[0009] In some embodiments, outputting the flexible body file of the finite element model of the vehicle includes: defining operating condition card parameters based on the finite element model of the vehicle to obtain the flexible body file of the finite element model of the vehicle, wherein the model parameters of the flexible body file satisfy a second preset condition.

[0010] In some embodiments, establishing a test bench mesh model for vehicle rollover includes: establishing a finite element model of a rollover test bench structure, wherein the rollover test bench structure includes a straight road surface structure and a single-sided rollover test bench structure; meshing the finite element model of the rollover test bench structure to generate the test bench mesh model.

[0011] The second aspect of the present application discloses a method for determining vehicle safety, comprising: obtaining position state parameters of a vehicle; determining an airbag deployment critical value of the vehicle based on the position state parameters of the vehicle, wherein the airbag deployment critical value is used to indicate the safety of the vehicle; wherein the position state parameters of the vehicle are obtained by the vehicle rollover simulation method described in the first aspect.

[0012] The third aspect of the present application discloses an electronic device, comprising a memory and a processor coupled to each other, wherein the processor is used to execute program instructions stored in the memory to implement the vehicle rollover simulation method described in the first aspect, or to implement the vehicle safety determination method described in the second aspect.

[0013] The fourth aspect of the present application discloses a non-volatile computer-readable storage medium having program instructions stored thereon, which, when executed by a processor, implement the vehicle rollover simulation method described in the first aspect, or implement the vehicle safety determination method described in the second aspect.

[0014] The beneficial effects of the present application are as follows: by constructing a finite element model of the vehicle, outputting a flexible body file of the finite element model of the vehicle, and constructing an original vehicle dynamics model based on the flexible body file, refining the original vehicle dynamics model to obtain a target vehicle dynamics model, and establishing a bench mesh model for vehicle rollover, and building a virtual test field for vehicle rollover based on the bench mesh model, so as to simulate the target vehicle dynamics model in the virtual test field and obtain the position state parameters of the vehicle, thereby realizing low-cost, high-efficiency and high-precision whole vehicle simulation analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present application will be further described below in conjunction with the accompanying drawings and implementation methods, in which:

[0016] Figure 1 is a flow chart of a vehicle rollover simulation method according to an embodiment of the present application;

[0017] Figure 2 is a schematic diagram of a flip stand structure according to an embodiment of the present application;

[0018] Figure 3 is a flow chart of a vehicle safety determination method according to an embodiment of the present application;

[0019] Figure 4 is a schematic diagram of the structure of an electronic device according to an embodiment of the present application;

[0020] Figure 5 It is a schematic diagram of the structure of the non-volatile computer-readable storage medium of an embodiment of the present application. DETAILED DESCRIPTION

[0021] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of, for example, including at least one of A, B, and C, and can mean including any one or more elements selected from the set consisting of A, B, and C. In addition, the terms "first", "second", and "third" in this application are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0023] At present, to determine when the airbag will be deployed in the event of a vehicle rollover, the airbag can be calibrated through physical sample vehicle testing. That is, through the sample vehicle rollover test, the key position state parameters of the vehicle, such as acceleration or angular velocity, are obtained, and the airbag is deployed when the relevant parameters reach a critical state. This method calibrates the airbag deployment time through physical sample vehicle testing, which requires a sample vehicle to be tested, so the intervention stage is relatively late and the test cost is high.

[0024] To this end, the present application proposes a vehicle rollover simulation method, a vehicle safety determination method and related equipment.

[0025] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] See also Figure 1 , Figure 1 The flowchart of the vehicle rollover simulation method of the embodiment of the present application is shown in FIG. The execution subject of the method can be an electronic device with computing function, such as a microcomputer, a server, and a mobile device such as a laptop computer and a tablet computer.

[0027] It should be noted that if there are substantially the same results, the method of the present application is not limited to Figure 1 The process sequence shown is limited.

[0028] In some possible implementations, the method may be implemented by a processor calling computer-readable instructions stored in a memory, such as Figure 1 As shown, the method may include the following steps:

[0029] S11: construct a finite element model of the vehicle, and output a flexible body file of the finite element model of the vehicle.

[0030] The finite element model of the vehicle is constructed using preset data, and the flexible body file of the finite element model of the vehicle is output. The preset data can be preset based on the actual flexible characteristics of the vehicle components. Among them, the finite element model is a model established when the finite element analysis method is used. It is a group of unit combinations that are connected at nodes, transmit forces at nodes, and are constrained at nodes. The flexible body file of the finite element model refers to a file generated by finite element analysis software, which is used to describe the elastic deformation of an object and the rigid-flexible coupling simulation. It usually contains data such as the geometric information of the object, node positions and their connections, node mass and inertia, modal information, modal mass and modal stiffness.

[0031] S12: Based on the flexible body file, an original vehicle dynamics model is constructed, and the original vehicle dynamics model is refined to obtain a target vehicle dynamics model.

[0032] Based on the flexible body file of the finite element model of the vehicle, an original vehicle dynamics model is constructed. Further, the obtained original vehicle dynamics model is refined to obtain a target vehicle dynamics model, wherein the target vehicle dynamics model can be obtained by refining the original vehicle dynamics model based on the deformation of the vehicle after the impact.

[0033] S13: Establishing a test bench grid model for vehicle rollover, and building a virtual test field for vehicle rollover based on the test bench grid model.

[0034] A test bench mesh model for vehicle rollover is established in the finite element modeling software, wherein the test bench for vehicle rollover includes a road surface for vehicle rollover and a rollover platform. Furthermore, a virtual test field for vehicle rollover is built using the test bench mesh model for vehicle rollover and the target vehicle dynamics model, so as to perform whole vehicle simulation analysis.

[0035] S14: In the virtual test field, the target vehicle dynamics model is simulated to obtain the position state parameters of the vehicle.

[0036] In the constructed virtual test field, the target vehicle dynamics model is simulated to obtain the position state parameters of the vehicle. For example, in the virtual test field, according to the spiral rollover test method, the test vehicle speed is set, the gear is set, the simulation step is set to 0.001, and the simulation time setting needs to ensure that the vehicle can rush out of the rollover test bench, so as to perform simulation calculations and output the position state parameters of the vehicle. The position state parameters of the vehicle can include the displacement, speed, acceleration, angular velocity, etc. of the preset position point of the vehicle, and the position state parameters of the vehicle at the corresponding moment can be used to determine the time to detonate the airbag.

[0037] In this embodiment, a finite element model of the vehicle is constructed, a flexible body file of the finite element model of the vehicle is output, and an original vehicle dynamics model is constructed based on the flexible body file. The original vehicle dynamics model is refined to obtain a target vehicle dynamics model, and a bench mesh model for vehicle rollover is established. Based on the bench mesh model, a virtual test field for vehicle rollover is built to simulate the target vehicle dynamics model in the virtual test field to obtain the position state parameters of the vehicle, thereby achieving low-cost, high-efficiency and high-precision whole vehicle simulation analysis.

[0038] Furthermore, by providing vehicle rollover parameter signals in the early stages of vehicle design and development, the critical value of airbag deployment can be determined in advance, and the model accuracy can be continuously calibrated according to the progress of vehicle development, and simulation data can be continuously provided, thereby saving development costs and improving simulation accuracy.

[0039] In some embodiments, the finite element model of the vehicle includes at least one of the following: a body finite element model, a front and rear suspension swing arm finite element model, a stabilizer bar finite element model, a subframe finite element model, and a finite element model of a suspension rod that meets a first preset condition.

[0040] Construct a finite element model of the vehicle, for example, construct a body finite element model, a front and rear suspension arm finite element model, a stabilizer bar finite element model, a subframe finite element model and a finite element model of a suspension member that meets a first preset condition according to preset data. The preset data may be preset based on actual flexibility characteristics of the vehicle member, wherein the suspension member that meets the first preset condition may be a suspension member with a modal frequency less than 200 Hz, and the modal frequency is the natural frequency of the finite element model obtained in the modal analysis, which is used to reflect the characteristics of the structure during free vibration.

[0041] In some embodiments, outputting a flexible body file of a finite element model of a vehicle includes: defining operating condition card parameters based on the finite element model of the vehicle to obtain a flexible body file of the finite element model of the vehicle, wherein the model parameters of the flexible body file satisfy a second preset condition.

[0042] For example, based on the constructed vehicle body finite element model, front and rear suspension arm finite element model, stabilizer bar finite element model, subframe finite element model and suspension rod finite element model that meets the first preset condition, the working condition card parameters are defined to obtain the corresponding flexible body file, wherein the working condition card parameters of the finite element model include material parameters, attribute definition, super unit definition, constraint modal calculation definition, flexible body output card, etc. The model parameters of the flexible body file meet the second preset condition, for example, the modal order of the flexible body file of the output vehicle finite element model is the number of connection points * 6 + 20, and the model quality and modal frequency values ​​are normal. Accordingly, for models with abnormal values, it is necessary to check and adjust the finite element model until the correct flexible body file is output.

[0043] Furthermore, in some embodiments, based on the flexible body file, an original vehicle dynamics model is constructed, including: importing the flexible body file into a vehicle dynamics model template, determining the connection relationship between the flexible bodies to build at least one subsystem; and assembling the original vehicle dynamics model based on at least one subsystem module, wherein the original vehicle dynamics model includes a simulation signal acquisition channel set at a preset position point of the vehicle.

[0044] Import the flexible body file into the vehicle dynamics model template, determine the connection relationship between the flexible bodies, and build at least one subsystem. For example, import the output body flexible body into the body dynamics template, the suspension rod flexible body and the subframe flexible body into the front and rear suspension templates, and the stabilizer bar flexible body into the stabilizer bar template, and establish the correct connection relationship between the flexible bodies and between the flexible bodies and other components. Further, according to the vehicle model design data, establish the front and rear suspension templates, front and rear stabilizer bar templates, steering system templates, powertrain templates, tire templates, brake templates, and body and accessories templates, so as to complete the construction of at least one subsystem according to the template.

[0045] The original vehicle dynamics model is obtained based on at least one subsystem assembly, that is, all subsystems are assembled into a vehicle dynamics model of the whole vehicle as the original vehicle dynamics model. The whole vehicle model is debugged so that the parameters such as the whole vehicle mass and axle load in the original vehicle dynamics model are consistent with the preset values ​​provided. For example, the unsprung mass of the whole vehicle and the height of the center of mass of the whole vehicle in the original vehicle dynamics model are consistent with the preset values. The unsprung mass of the suspension determines the impact force of the suspension driving on the step, and the height of the center of mass of the whole vehicle determines the wheel load transfer amount during the vehicle rollover process.

[0046] The original vehicle dynamics model includes a simulation signal acquisition channel set at a preset position point of the vehicle, that is, according to the rollover test signal acquisition requirements, a simulation signal acquisition channel is established at a preset position in the vehicle dynamics model. The simulation signal includes displacement, velocity, acceleration, angular velocity, etc. The preset position point can be a spring, shock absorber, limit device and other elastic elements with large load-bearing capacity that directly act on the vehicle body structure installation point. The simulation signal acquisition channel can be understood as an analog sensor.

[0047] In this embodiment, the flexible body file is imported into the vehicle dynamics model template, and the connection relationship between the flexible bodies is determined to build at least one subsystem, and the original vehicle dynamics model is obtained based on the assembly of at least one subsystem module, that is, through the combination of the finite element model and the vehicle dynamics model, low-cost, high-efficiency and high-precision whole vehicle simulation analysis is achieved.

[0048] In some embodiments, refining the original vehicle dynamics model includes: refining the bushing stiffness of the target rod in the original vehicle dynamics model to obtain a processed bushing stiffness curve, so that the processed bushing stiffness curve is consistent with the actual structure.

[0049] Among them, the target rods include swing arms and stabilizer bars, that is, the bushing stiffness of the swing arms and stabilizer bars in the original vehicle dynamics model is refined to obtain the processed bushing stiffness curve, so that the processed bushing stiffness curve of the swing arm and stabilizer bar is consistent with the actual structure. For example, according to the installation condition of the rubber bushing, the limit clearance value of the rubber bushing in each direction is obtained, and the bushing stiffness curve of the swing arm and stabilizer bar is modified. For example, the initial stiffness curve of the swing arm and stabilizer bar is extended to make it consistent with the actual structure of the bushing of the swing arm and stabilizer bar and have the same limit change.

[0050] In this embodiment, the bushing stiffness of the swing arm and stabilizer bar in the original vehicle dynamics model is refined to obtain a processed bushing stiffness curve, so that the processed bushing stiffness curve is consistent with the actual structure, that is, for accurate simulation of vehicle posture and force, a stiffness refinement model of rubber bushing connections such as swing arms and stabilizer bars is proposed, which fully considers the deformation of the suspension after a large impact, thereby improving the accuracy of the obtained vehicle position state parameters.

[0051] In some embodiments, the original vehicle dynamics model is refined, further comprising: performing structural flexible deformation simulation on preset position points to obtain bushing stiffness curves at preset position points, wherein the linear segment of the bushing stiffness curve at the preset position points is used to simulate the structural elastic deformation stage, and the nonlinear segment of the bushing stiffness curve at the preset position points is used to simulate the structural plastic deformation stage.

[0052] The preset position point is simulated for structural flexible deformation to obtain the bushing stiffness curve of the preset position point, that is, the bushing stiffness curve is used to simulate the structural flexible deformation at the preset installation point of the vehicle body, for example, the finite element model of the vehicle is used to perform structural nonlinear simulation calculation, and then the bushing stiffness curve of the preset installation point of the vehicle body is fitted, wherein the linear segment of the bushing stiffness curve of the preset position point is used to simulate the structural elastic deformation stage, and the nonlinear segment of the bushing stiffness curve of the preset position point is used to simulate the structural plastic deformation stage, that is, the linear segment of the bushing stiffness curve simulates the structural elastic deformation stage of the preset position point of the vehicle, and the nonlinear segment of the bushing stiffness curve simulates the structural plastic deformation stage of the preset position point of the vehicle. Among them, one end of the bushing connection is an elastic element, and the other end is a vehicle body, and the vehicle body can be a rigid body.

[0053] In this embodiment, the structural flexible deformation simulation is performed on the preset position point to obtain the bushing stiffness curve of the preset position point, wherein the linear segment of the bushing stiffness curve of the preset position point is used to simulate the structural elastic deformation stage, and the nonlinear segment of the bushing stiffness curve of the preset position point is used to simulate the structural plastic deformation stage, that is, the vehicle body installation position is accurately simulated, and it can be determined that the structure can achieve a crushed state in addition to elastic deformation when subjected to an impact load, thereby ensuring accurate force deformation of the vehicle body end, thereby improving the accuracy of the obtained vehicle position state parameters.

[0054] In some embodiments, establishing a test bench mesh model for vehicle rollover includes: establishing a finite element model of a rollover test bench structure, wherein the rollover test bench structure includes a straight road surface structure and a single-sided rollover test bench structure; and meshing the finite element model of the rollover test bench structure to generate a test bench mesh model.

[0055] Establish a finite element model of the rollover test bench structure, which includes a straight road surface structure and a single-sided rollover test bench structure. For example, establish a rollover test bench in the finite element modeling software, including a straight test road surface and a single-sided rollover test bench, such as Figure 2 As shown, Figure 2 It is a schematic diagram of the rollover test bench structure of an embodiment of the present application, wherein the length of the test road surface is the length that the vehicle can travel at a constant speed for more than 5 seconds, the road surface width is greater than the vehicle width, and the width, length and angle of the single-sided rollover test bench are consistent with the dimensions of the actual vehicle test bench.

[0056] The finite element model of the rollover test bench structure is meshed to generate a test bench mesh model. For example, the test bench and the test road surface are meshed using triangular meshes with a size not exceeding 5 mm. The mesh size near the characteristic variation range of the rollover test bench is not more than 1 mm. The rollover test bench mesh model is then obtained, and the mesh node and unit information of the rollover test bench structure is output for building a virtual test field for vehicle rollover.

[0057] Furthermore, a rollover test bench road surface model is built based on the finite element model of the rollover test bench structure, that is, the rollover test bench grid model is output to obtain grid node and unit information, and a rollover test bench road surface model is built in the vehicle dynamics model according to the grid node and unit information. The road surface offset position is set, wherein the initial end of the road surface coincides with the rear of the vehicle, the road surface extension direction is the same as the vehicle driving direction, and the road surface height is set to contact the vehicle tire to prevent the initial simulation static balance from failing, and the road surface rotation angle is determined, for example, the road surface is parallel to the vehicle's XY plane, and the road surface friction coefficient is consistent with the test bench material, and then the spiral rollover road surface file is obtained.

[0058] In this embodiment, the finite element model of the rollover test bench structure is meshed, so that the accuracy of the test bench model and the accurate contact between the tire and the test bench are achieved, thereby improving the accuracy of the acquired position state parameters of the vehicle.

[0059] In some embodiments, a test bench grid model for vehicle rollover is established to build a virtual test field for vehicle rollover based on the test bench grid model. For example, the virtual test field for vehicle rollover is obtained by acquiring a target vehicle dynamics model, a rollover test bench road model, and a tire model.

[0060] Among them, the tire model can be a Ftire tire model. For example, the tire brand and model are obtained according to the design data to test and identify the model of the tire, identify the tire performance on different road surfaces, different turning angles, different roll angles, and different vehicle speeds, provide data such as tire torque, vertical force, and cornering force, and fit to generate a Ftire tire model used in dynamic simulation, thereby improving the accuracy of the tire model in the simulation.

[0061] Furthermore, in the dynamics software, the target vehicle dynamics model, rollover test bench road model, and tire model are retrieved for construction to obtain a virtual test field for vehicle rollover, and a whole vehicle simulation analysis is performed based on the spiral rollover virtual test field, i.e., a car rollover event caused by a car rushing onto the wedge-shaped structure at the end of the guardrail or the back slope of the road ditch is simulated. After the simulation is completed, the key position state parameters of the vehicle are output, thereby determining the time to detonate the airbag.

[0062] See also Figure 3 , Figure 3 FIG. 1 is a flow chart of a method for determining vehicle safety according to an embodiment of the present application. The method can be applied to an on-board device having functions such as computing. It should be noted that if there are substantially the same results, the method of the present application is not limited to Figure 3 The process sequence shown is limited.

[0063] In some possible implementations, the method may be implemented by a processor calling computer-readable instructions stored in a memory, such as Figure 3 As shown, the method may include the following steps:

[0064] S31: Obtaining the position state parameters of the vehicle.

[0065] Among them, the position state parameters of the vehicle are obtained through the above-mentioned vehicle rollover simulation method, that is, constructing a finite element model of the vehicle, outputting the flexible body file of the finite element model of the vehicle, constructing the original vehicle dynamics model based on the flexible body file, and refining the original vehicle dynamics model to obtain the target vehicle dynamics model, and establishing a bench mesh model for vehicle rollover, and building a virtual test field for vehicle rollover based on the bench mesh model. In the virtual test field, the target vehicle dynamics model is simulated to obtain the position state parameters of the vehicle, and the specific content will not be repeated here.

[0066] S32: Determine an airbag deployment threshold value of the vehicle according to the position state parameters of the vehicle, wherein the airbag deployment threshold value is used to indicate the safety of the vehicle.

[0067] The critical value of the vehicle's airbag deployment is determined based on the vehicle's position state parameters. That is, the rigid-flexible coupling vehicle dynamics model is simulated in a virtual rollover test field to obtain the vehicle's key position state parameters (acceleration or angular velocity, etc.), and then the critical value of the airbag deployment is set. The critical value of the airbag deployment is used to indicate the safety of the vehicle.

[0068] In this embodiment, the position state parameters of the vehicle are obtained through the above-mentioned vehicle rollover simulation method, and the critical value of the vehicle's airbag detonation is determined based on the position state parameters of the vehicle, thereby achieving early intervention time. Taking into account the bouncing deformation of the suspension during vehicle movement, the stress state of the tire during driving can be accurately simulated. The introduction of the flexible characteristics of the suspension rod can provide deformation buffering for the body and suspension rod structure when a large impact force occurs after the vehicle rushes up the steps, thereby ensuring that the simulated stress condition and movement posture of the whole vehicle are close to those of the actual vehicle, with high output parameter accuracy, and at the same time, one round of simulation analysis only takes 0.5h, with a short cycle and high simulation efficiency.

[0069] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0070] See also Figure 4 , Figure 4 4 is a schematic diagram of the structure of an electronic device of an embodiment of the present application. The electronic device 40 includes a memory 41 and a processor 42 coupled to each other, and the processor 42 is used to execute program instructions stored in the memory 41 to implement the steps of the above-mentioned vehicle rollover simulation method embodiment, or to implement the steps of the above-mentioned vehicle safety determination method embodiment. In a specific implementation scenario, the electronic device 40 may include but is not limited to: a microcomputer, a server, which is not limited here.

[0071] Specifically, the processor 42 is used to control itself and the memory 41 to implement the steps of the above-mentioned vehicle rollover simulation method embodiment, or to implement the steps of the above-mentioned vehicle safety determination method embodiment. The processor 42 can also be called a CPU (Central Processing Unit), and the processor 42 may be an integrated circuit chip with signal processing capabilities. The processor 42 can also be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 42 can be implemented by an integrated circuit chip.

[0072] See also Figure 5 , Figure 5 Schematic diagram of the structure of a non-volatile computer-readable storage medium according to an embodiment of the present application. The non-volatile computer-readable storage medium 50 is used to store a computer program 501. When the computer program 501 is executed by a processor, for example, Figure 4 When the processor 42 in the embodiment is executed, it is used to implement the steps of the above-mentioned vehicle rollover simulation method embodiment, or to implement the steps of the above-mentioned vehicle safety determination method embodiment.

[0073] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0074] In the several embodiments provided in the present application, it should be understood that the disclosed methods and related devices can be implemented in other ways. For example, the above-described related device implementations are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as 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 disconnection shown or discussed can be through some interfaces, indirect coupling or communication disconnection of devices or units, which can be electrical, mechanical or other forms.

[0075] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0076] 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 is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

[0077] It is easy for a person skilled in the art to know that many modifications and changes can be made to the device and method while maintaining the teaching content of the present application. Therefore, the above disclosure should be considered as limited only by the scope of the appended claims.

Claims

1. A vehicle rollover simulation method, characterized in that: include: Constructing a finite element model of a vehicle and outputting a flexible body file of the finite element model of the vehicle; Based on the flexible body file, an original vehicle dynamics model is constructed, and the original vehicle dynamics model is refined to obtain a target vehicle dynamics model; Establishing a test bench grid model for vehicle rollover, and building a virtual test field for vehicle rollover based on the test bench grid model; In the virtual test field, the target vehicle dynamics model is simulated to obtain the position state parameters of the vehicle.

2. The method according to claim 1, characterized in that The step of constructing an original vehicle dynamics model based on the flexible body file includes: Importing the flexible body file into a vehicle dynamics model template, determining the connection relationship between the flexible bodies, and obtaining at least one subsystem; The original vehicle dynamics model is assembled based on the at least one subsystem, and the original vehicle dynamics model includes a simulation signal acquisition channel set at a preset position point of the vehicle.

3. The method according to claim 2, characterized in that The refining of the original vehicle dynamics model comprises: The bushing stiffness of the target rod in the original vehicle dynamics model is refined to obtain a processed bushing stiffness curve, so that the processed bushing stiffness curve is consistent with the actual structure.

4. The method according to claim 2, characterized in that: The refining of the original vehicle dynamics model further includes: The structural flexible deformation simulation is performed on the preset position point to obtain the bushing stiffness curve of the preset position point, wherein the linear segment of the bushing stiffness curve of the preset position point is used to simulate the structural elastic deformation stage, and the nonlinear segment of the bushing stiffness curve of the preset position point is used to simulate the structural plastic deformation stage.

5. The method according to claim 1, characterized in that The finite element model of the vehicle includes at least one of the following: The vehicle body finite element model, the front and rear suspension swing arm finite element model, the stabilizer bar finite element model, the subframe finite element model and the finite element model of the suspension rod that meets the first preset condition.

6. The method according to claim 5, characterized in that The outputting of the flexible body file of the finite element model of the vehicle comprises: Based on the finite element model of the vehicle, operating condition card parameters are defined to obtain a flexible body file of the finite element model of the vehicle, wherein the model parameters of the flexible body file meet a second preset condition.

7. The method according to claim 1, characterized in that The step of establishing a bench grid model for vehicle rollover comprises: Establishing a finite element model of a turning platform structure, wherein the turning platform structure includes a straight road surface structure and a single-side turning platform structure; The finite element model of the flip platform structure is meshed to generate the platform mesh model.

8. A vehicle safety determination method, characterized in that: include: Get the position status parameters of the vehicle; Determining an airbag detonation threshold value of the vehicle according to the position state parameter of the vehicle, wherein the airbag detonation threshold value is used to indicate the safety of the vehicle; Wherein, the position state parameters of the vehicle are obtained by the vehicle rollover simulation method described in any one of claims 1-7.

9. An electronic device, characterized in that: It comprises a memory and a processor coupled to each other, wherein the processor is used to execute program instructions stored in the memory to implement the vehicle rollover simulation method described in any one of claims 1 to 7, or to implement the vehicle safety determination method described in claim 8.

10. A non-volatile computer-readable storage medium having program instructions stored thereon, characterized in that: When the program instructions are executed by the processor, the vehicle rollover simulation method described in any one of claims 1 to 7 is implemented, or the vehicle safety determination method described in claim 8 is implemented.

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