Vehicle impact strength analysis method, system and equipment and readable storage medium

Abstract

The invention discloses a vehicle impact strength analysis method, system and device and a readable storage medium, and relates to the technical field of vehicle impact strength analysis, in particular to a method comprising the steps that target parameters corresponding to a target vehicle are input into a preset interactive simulation model; the target parameters comprise a load condition and a control parameter, a target whole vehicle multi-body dynamic model in the interactive simulation model generates displacement information based on the target parameters, the displacement information is transmitted to a target nonlinear finite element model in the interactive simulation model through a preset interaction point for simulation calculation, a target stress value is obtained, and the target parameters comprise the load condition and the control parameter; the interaction point is an information transmission interface between the target whole vehicle multi-body dynamic model and the target nonlinear finite element model; and obtaining an impact strength analysis result of the target vehicle based on a magnitude relationship between the target stress value and a preset stress threshold value. The problems that in the prior art, efficiency is low, and the impact strength analysis precision is low due to the fact that plastic deformation of the structural part is not considered in the load decomposition process are solved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle impact strength analysis, and in particular to a vehicle impact strength analysis method, system, device and readable storage medium. Background Art

[0002] As the automotive industry continues to increase its requirements for driving safety and structural strength performance, the optimization and evaluation of the suspension system has become one of the key technologies. In the existing technology, the evaluation of the structural impact strength performance of the vehicle under the extreme misuse condition is mainly carried out through virtual simulation analysis and physical test verification. Commonly used simulation methods include full finite element method and semi-finite element method.

[0003] The full finite element method combines the whole vehicle with the road finite element model to solve the dynamic stress of the whole vehicle under extreme working conditions, but this method has problems such as complex calculation, difficult convergence, and low simulation efficiency; the semi-finite element method decomposes the load through the multi-body dynamics of the whole vehicle and then performs finite element analysis on each component. However, it relies on a linear flexible body model, so it is impossible to accurately simulate the plastic deformation involved in the linear flexible body components under extreme working conditions when decomposing the load, resulting in the inability to obtain sufficiently accurate extreme working condition loads, which in turn makes the vehicle impact strength analysis results low in accuracy.

[0004] Therefore, how to solve the problems of low efficiency in the prior art and low accuracy of impact strength analysis results caused by failure to consider the plastic deformation of structural parts in the load decomposition process is currently an urgent issue to be considered. Summary of the invention

[0005] The present application provides a vehicle impact strength analysis method, system, device and readable storage medium, which can solve the problems of low efficiency and low accuracy of impact strength analysis results caused by the failure to consider the plastic deformation of structural parts in the load decomposition process in the prior art.

[0006] In a first aspect, an embodiment of the present application provides a vehicle impact strength analysis method, the vehicle impact strength analysis method comprising:

[0007] Input the target parameters corresponding to the target vehicle into a preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters, and transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through a preset interactive point for simulation calculation to obtain a target stress value, wherein the target parameters include load conditions and control parameters, and the interactive point is an information transmission interface between the target vehicle multi-body dynamics model and the target nonlinear finite element model;

[0008] The impact strength analysis result of the target vehicle is obtained based on the magnitude relationship between the target stress value and the preset stress value threshold.

[0009] In combination with the first aspect, in one implementation, the interaction point includes a first interaction point and a second interaction point, and before the step of inputting the target parameters corresponding to the target vehicle into the preset interactive simulation model, the method further includes:

[0010] Establishing a plurality of first interaction points at the linear flexible body components in the preset whole vehicle multi-body dynamics model to obtain a target whole vehicle multi-body dynamics model;

[0011] Taking the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point, a target nonlinear finite element model is obtained, wherein the rigid connection unit is a connection unit corresponding to the connection area outside the linear flexible body;

[0012] The target vehicle multi-body dynamics model and the target nonlinear finite element model are used as interactive simulation models.

[0013] In combination with the first aspect, in one embodiment, after the step of establishing a plurality of first interaction points at the linear flexible body component in the preset vehicle multi-body dynamics model, the method further includes:

[0014] A dummy object is created at each first interaction point to replace the linear flexible body interface and the linear flexible body connection relationship in the preset whole vehicle multi-body dynamics model with the dummy object.

[0015] In combination with the first aspect, in one implementation, before the step of using the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point, the method further includes:

[0016] Nonlinear constraints of material, geometry and boundary conditions are applied to the nonlinear finite element model of the linear flexible body component in the preset whole vehicle multibody dynamics model, and the external connection area of ​​the linear flexible body component is modeled as a rigid connection unit to obtain the preset nonlinear finite element model.

[0017] In combination with the first aspect, in one implementation, the transmitting of displacement information to a target nonlinear finite element model in an interactive simulation model through a preset interactive point for simulation calculation to obtain a target stress value includes:

[0018] The displacement information is transmitted to a target nonlinear finite element model based on a first interaction point, the target nonlinear finite element model determines torque information based on the displacement information and transmits the torque information to a target vehicle multi-body dynamics model based on a second interaction point;

[0019] The displacement information is used as a boundary condition of a target nonlinear finite element model, so that the target nonlinear finite element model performs simulation calculation based on the boundary condition to obtain a target stress value.

[0020] In combination with the first aspect, in one implementation, obtaining the impact strength analysis result of the target vehicle based on the magnitude relationship between the target stress value and the preset stress value threshold includes:

[0021] If the target stress value is less than a preset stress value threshold, the vehicle impact strength analysis result is determined to be that the vehicle impact strength meets the safety requirements;

[0022] If the target stress value is greater than or equal to the preset stress value threshold, the vehicle impact strength analysis result is determined to be that the vehicle impact strength does not meet the safety requirements.

[0023] In a second aspect, an embodiment of the present application provides a vehicle impact strength analysis system, the vehicle impact strength analysis system comprising:

[0024] A first processing module, which is used to input target parameters corresponding to the target vehicle into a preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters, and transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through a preset interactive point for simulation calculation to obtain a target stress value, wherein the target parameters include load conditions and control parameters, and the interactive point is an information transmission interface between the target vehicle multi-body dynamics model and the target nonlinear finite element model;

[0025] The second processing module is used to obtain the impact strength analysis result of the target vehicle based on the magnitude relationship between the target stress value and the preset stress value threshold.

[0026] In conjunction with the second aspect, in one implementation, the first processing module is specifically configured to:

[0027] Establishing a plurality of first interaction points at the linear flexible body components in the preset whole vehicle multi-body dynamics model to obtain a target whole vehicle multi-body dynamics model;

[0028] Taking the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point, a target nonlinear finite element model is obtained, wherein the rigid connection unit is a connection unit corresponding to the connection area outside the linear flexible body;

[0029] The target vehicle multi-body dynamics model and the target nonlinear finite element model are used as interactive simulation models.

[0030] In a third aspect, an embodiment of the present application provides a vehicle impact strength analysis device, which includes a processor, a memory, and a vehicle impact strength analysis program stored in the memory and executable by the processor, wherein when the vehicle impact strength analysis program is executed by the processor, the steps of the vehicle impact strength analysis method described in any of the above items are implemented.

[0031] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a vehicle impact strength analysis program is stored, wherein when the vehicle impact strength analysis program is executed by a processor, the steps of the vehicle impact strength analysis method as described in any of the foregoing items are implemented.

[0032] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0033] The target parameters including load conditions and control parameters corresponding to the target vehicle are input into the preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters. The target vehicle multi-body dynamics model transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through the interactive points for information transmission for simulation calculation to obtain the target stress value. The target vehicle multi-body dynamics model introduces the nonlinear finite element model to simulate the nonlinear behaviors such as plastic deformation and buckling under extreme working conditions such as impact and collision through data exchange at the interactive points, thereby overcoming the defect that the traditional vehicle multi-body dynamics model cannot simulate the nonlinear behavior of the structural components themselves under extreme working conditions. Moreover, by combining the target vehicle multi-body dynamics model with the target nonlinear finite element model, the problem of low efficiency caused by directly solving the coupling of the vehicle and the road finite element model is effectively avoided, and the calculation efficiency of the nonlinear finite element solution is fully improved. The impact strength analysis result of the target vehicle is obtained based on the size relationship between the target stress value and the preset stress value threshold, so that the impact strength of the vehicle can be quickly and accurately judged, further improving the accuracy and efficiency of the simulation analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of an embodiment of a vehicle impact strength analysis method of the present application;

[0035] Figure 2 A schematic diagram of the construction process of the interactive simulation model in the embodiment of the vehicle impact strength analysis method of the present application;

[0036] Figure 3 For this application Figure 1 Detailed flow chart of step S20;

[0037] Figure 4This is a schematic diagram of the hardware structure of the vehicle impact strength analysis device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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.

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0040] In a first aspect, an embodiment of the present application provides a vehicle impact strength analysis method.

[0041] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of the vehicle impact strength analysis method of the present application. Figure 1 As shown, the vehicle impact strength analysis method includes:

[0042] Step S10: Input the target parameters corresponding to the target vehicle into the preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters, and transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through the preset interaction points for simulation calculation to obtain the target stress value, wherein the target parameters include load conditions and control parameters, and the interaction points are the information transmission interface between the target vehicle multi-body dynamics model and the target nonlinear finite element model.

[0043] Exemplarily, in the embodiment of the present application, firstly, the digital road surface of the test field under the extreme working condition of misuse is modeled to obtain a digital road surface model. Specifically, the road of the test field under the extreme working condition of misuse has regular road surfaces and irregular road surfaces. For regular roads, a three-dimensional road surface model is constructed according to drawings or measurement data, and then a triangular mesh is used to discretize the road surface, and finally a digital road surface file is defined according to the road surface format; for irregular roads, a laser scanning method is used to obtain road surface point cloud data, and then the point cloud data is meshed to generate a digital road surface. Secondly, the digital tire is modeled to obtain a digital virtual simulation tire model. Specifically, a group of tires of a specific model are tested, and model parameters are identified based on the test data to generate a Ftire model, wherein the Ftire model can be reused, and after accumulating a certain number of Ftire models of tires of different models, a virtual tire model database can be formed to facilitate subsequent direct selection.

[0044] It should be understood that the multi-body dynamics model of the whole vehicle can be constructed by multi-body dynamics software. In the embodiment of the present application, one of the multi-body dynamics software (i.e., MSC.Adams software) is preferably used to establish a preset multi-body dynamics model of the whole vehicle, which includes a front suspension system, a rear suspension system, a powertrain system, a body system, a steering system, a tire system, a stabilizer bar system, and a braking system. The tire system can use the corresponding Ftire model in the digital virtual simulation tire model, and define the connection relationship of each component according to the actual connection relationship, update the attribute files of elastic components such as bushings, springs, and shock absorbers to measured parameters, and replace the components with large deformations such as triangular arms and torsion beams in the suspension system with linear flexible bodies. According to the weight of the whole vehicle and the parameters of the suspension jump travel, the parameters such as the spring preload, the limit block gap, and the body weight are adjusted, and then the suspension system KC characteristic simulation and experimental benchmarking analysis are performed, and the elastic component stiffness and damping parameters are fine-tuned to realize the debugging and verification of the model, so as to obtain a high-precision multi-body dynamics model of the whole vehicle.

[0045] It should be noted that the preset interactive simulation model includes a target vehicle multi-body dynamics model and a target nonlinear finite element model, wherein the target nonlinear finite element model can be constructed by finite element analysis software, and in the embodiment of the present application, one of the finite element analysis software (i.e., MSC.Marc software) is preferably used to construct the target nonlinear finite element model; specifically, the execution and coupling analysis of the interactive simulation model can be driven and managed by creating a data interface configuration file (such as configuration.cosim) for vehicle multi-body dynamics and finite element simulation analysis, a script file for driving simulation, and MSC.Adams, MSC.Marc and configuration running script files. The target vehicle multi-body dynamics model is a mathematical model that simulates the dynamic behavior of the vehicle, and is used to describe the motion behavior of the target vehicle under the influence of external forces, constraints, power input, etc. It takes into account the interaction between various components, usually involving multiple components such as tires, body, and suspension system. The target nonlinear finite element model is used to simulate the response of the vehicle structure under external loads, especially the nonlinear behavior of the structure that may occur when the load conditions exceed the linear range (such as material yield, plastic deformation, large geometric deformation, etc.). The target nonlinear finite element model mainly performs numerical calculations by dividing the object into finite element units, that is, the nonlinear finite element model performs structural analysis based on the displacement information transmitted from the multi-body dynamics model, and calculates the stress distribution of the vehicle under dynamic loads.

[0046] It can be understood that the target parameters refer to the key information input into the simulation model, which directly affects the dynamic behavior and structural response of the target vehicle. The target parameters mainly include load conditions and control parameters, where load conditions refer to external loads acting on the target vehicle, such as road excitation, collision loads, dynamic loads, etc., which determine the force conditions of the vehicle under different working conditions; control parameters are parameters related to the vehicle control system, such as braking, acceleration, steering and other control instructions, which control the vehicle's motion state and affect the vehicle's dynamic behavior; displacement information refers to the relative position changes of various components of the target vehicle under specific load and control conditions, reflecting the dynamic response of the vehicle. Displacement information is passed to the nonlinear finite element model as a key physical quantity. The interaction point is an important link between the multi-body dynamics model and the finite element model, ensuring that the displacement information obtained from the dynamic calculation can be accurately transferred to the nonlinear finite element model and used as the boundary condition of the model for further analysis. The preset interaction point can be determined according to actual needs and is not limited here. The target stress value reflects the stress state of each structural component of the vehicle under dynamic loads. At the same time, it can reveal the potential weaknesses of the structure under extreme working conditions such as collision and vibration, and is an important reference value for vehicle impact strength analysis.

[0047] Specifically, after inputting target parameters into the target vehicle multi-body dynamics model, the displacement information is obtained through processing by the target vehicle multi-body dynamics model, and the displacement information is transmitted to the target nonlinear finite element model. The target nonlinear finite element model performs complex simulation calculations by solving relevant partial differential equations and considering factors such as material nonlinearity and geometric nonlinearity, and finally outputs the target stress value, thereby analyzing the safety and durability of the target vehicle structure based on the target stress value.

[0048] It should be noted that after the interactive simulation calculation is completed, the dynamic stress cloud map and plastic strain cloud map of the components under each misuse limit condition can be extracted from the interactive simulation model. The two cloud maps show the stress distribution and deformation of each component of the target vehicle under the misuse limit condition. The weak positions and dangerous moments of different components under the misuse limit condition can be identified through the two cloud maps. Among them, the weak position refers to the concentrated area of ​​stress and strain, which is subjected to stress exceeding the design load or plastic deformation exceeding the yield point of the material; the dangerous moment refers to the time point when the component is subjected to maximum stress or plastic deformation under dynamic conditions. Therefore, the impact strength of the vehicle can be evaluated by obtaining the stress value of each component at the dangerous moment.

[0049] Step S20: Obtaining an impact strength analysis result of the target vehicle based on the magnitude relationship between the target stress value and a preset stress value threshold.

[0050] Exemplarily, in an embodiment of the present application, a preset stress value threshold is used to evaluate whether the structure is safe under an impact load, and its specific value can be set based on vehicle design requirements and engineering standards, and is not limited here; the target stress value is calculated by a nonlinear finite element model, which represents the stress distribution of the vehicle structure under an impact load (such as a collision, sudden braking, etc.).

[0051] Specifically, by comparing the magnitude relationship between the target stress value and the preset stress value threshold, it can be determined whether the suspension structure of the vehicle exceeds the safety limit, that is, whether the target vehicle can withstand the impact load under extreme working conditions. It can be understood that by analyzing the impact strength by comparing the magnitude relationship between the target stress value and the preset stress value threshold, it can ensure that the vehicle complies with relevant safety regulations and industry standards, and ensure that the product can pass various collision and safety tests when it is launched on the market.

[0052] The present application inputs target parameters including load conditions and control parameters corresponding to the target vehicle into a preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters. The target vehicle multi-body dynamics model transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through the interactive points used for information transmission for simulation calculation to obtain the target stress value. The target vehicle multi-body dynamics model introduces a nonlinear finite element model to simulate nonlinear behaviors such as plastic deformation and buckling under extreme working conditions such as impact and collision through data exchange at the interactive points, thereby overcoming the defect that the traditional vehicle multi-body dynamics model cannot simulate the nonlinear behavior of the structural components themselves under extreme working conditions. Moreover, by combining the target vehicle multi-body dynamics model with the target nonlinear finite element model, the problem of low efficiency caused by directly solving the coupling solution of the vehicle and the road finite element model is effectively avoided, and the computational efficiency of the nonlinear finite element solution is fully improved. The impact strength analysis result of the target vehicle is obtained based on the size relationship between the target stress value and the preset stress value threshold, so that the impact strength of the vehicle can be quickly and accurately judged, further improving the accuracy and efficiency of the simulation analysis.

[0053] Further, in one embodiment, referring to Figure 2 As shown, the interaction point includes a first interaction point and a second interaction point, and before the step of inputting the target parameters corresponding to the target vehicle into the preset interactive simulation model, it also includes:

[0054] Step P10: establishing a plurality of first interaction points at the linear flexible body components in the preset whole vehicle multi-body dynamics model to obtain a target whole vehicle multi-body dynamics model;

[0055] Step P20: taking the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point to obtain the target nonlinear finite element model, wherein the rigid connection unit is a connection unit corresponding to the external connection area of ​​the linear flexible body;

[0056] Step P30: Use the target vehicle multi-body dynamics model and the target nonlinear finite element model as interactive simulation models.

[0057] Exemplarily, in the embodiment of the present application, a flexible body refers to an object that can undergo elastic deformation, and a linear flexible body component refers to a flexible component represented by the linear elastic assumption (i.e., deformation is proportional to force) in a multi-body dynamics simulation; a rigid connection unit refers to the interface part between a linear flexible body and an external connection area, which is used to simulate the connection relationship between a rigid component and a flexible component to ensure the mechanical interaction of the model in the simulation. The rigid connection unit in the embodiment of the present application is RBE2. It should be noted that RBE2 is a rigid body unit, which is used to constrain multiple degree-of-freedom nodes together through rigid connections so that the displacement or motion of these nodes is consistent with the displacement of the main node. In other words, the motion of all connected sub-nodes is coupled with the motion of the main node, thereby forming a rigid body in the entire system; an interaction point is a key node for transmitting information and realizing coupling between different models, and includes a first interaction point and a second interaction point. In the target vehicle multi-body dynamics model, the interaction point is used to realize coupling between rigid components and transmit displacement information. The first interaction point is set at the linear flexible body part to transmit the displacement information of the vehicle to the target nonlinear finite element model; the second interaction point is set at the main node of the rigid connection unit in the target nonlinear finite element model to receive the displacement information transmitted by the first interaction point. After receiving the displacement information, the torque information can be obtained according to the displacement information and transmitted to the target vehicle multi-body dynamics model to realize information interaction, that is, the displacement information of the first interaction point is provided as input to the second interaction point, and the second interaction point transmits the torque information to the first interaction point, forming the coupling basis of the dynamic simulation and structural analysis of the whole vehicle. Through this coupling, the behavior of the vehicle under extreme conditions such as collision and emergency braking can be comprehensively analyzed; through the connection between the interaction points, it is ensured that the multi-body dynamics and nonlinear finite element analysis of the whole vehicle can work together to provide accurate dynamic and structural responses.

[0058] Specifically, the connection points of the flexible body parts are defined in the multi-body dynamics model of the target vehicle to enable effective interaction between the multi-body dynamics model and the flexible body parts (such as the suspension system, body, etc.); the main nodes of the rigid connection units in the nonlinear finite element model are used as interaction points to ensure the information transmission between the multi-body dynamics and the finite element model; an interactive simulation model is established by combining the above two models and coupling the two through the interaction points, which can simultaneously consider the dynamic behavior and structural deformation of the vehicle, especially for the dynamic response under large deformation and complex loads, and can provide more accurate simulation results.

[0059] Furthermore, in one embodiment, after the step of establishing a plurality of first interaction points at the linear flexible body components in the preset vehicle multi-body dynamics model, the method further includes:

[0060] A dummy object is created at each first interaction point to replace the linear flexible body interface and the linear flexible body connection relationship in the preset whole vehicle multi-body dynamics model with the dummy object.

[0061] Exemplarily, in the embodiment of the present application, the dummy object is an idealized model object, which is used as a virtual intermediary object in multi-body dynamics analysis. The dummy object itself does not have a practical impact on the simulation results. It is used to realize the connection relationship between the target vehicle multi-body dynamics model and the target nonlinear finite model; the linear flexible body interface refers to the connection between the rigid body and the flexible body through the Interface Part.

[0062] Specifically, the dummy object builds an effective connection bridge between the target nonlinear finite element model and the target vehicle multi-body dynamics model through the interaction points. It is connected to the rigid body through bushing connection, hinge connection, revolute connection and other connection methods, ensuring the joint simulation between the two different models, realizing the mutual coupling between the nonlinear flexible body components and the multi-body dynamics system during the movement, and simulating the actual situation more accurately.

[0063] Furthermore, in one embodiment, before the step of using the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point, it also includes:

[0064] Nonlinear constraints of material, geometry and boundary conditions are applied to the nonlinear finite element model of the linear flexible body component in the preset whole vehicle multibody dynamics model, and the external connection area of ​​the linear flexible body component is modeled as a rigid connection unit to obtain the preset nonlinear finite element model.

[0065] Exemplarily, in the embodiments of the present application, nonlinear constraints refer to nonlinear relationships imposed on the model, which are related to the nonlinear behavior of the material, geometric deformation, boundary conditions, etc., wherein material nonlinearity refers to the nonlinearity that the elastic modulus, yield strength, etc. of the material may exhibit within different strain ranges (such as plastic deformation or material hardening); geometric nonlinearity refers to the change in the geometric shape of the structure as the deformation increases, which in turn affects the mechanical behavior, such as stretching or bending under large deformation; boundary condition nonlinearity refers to the contact problem of nonlinear behavior generated in the contact area or boundary, such as nonlinear contact force, friction, etc.; rigid connection units are used to simplify the connection between components and reduce the computational burden, and are suitable for rigidly connected components.

[0066] Specifically, the linear flexible body parts (such as triangle arms, torsion beams, steering knuckles, etc.) in the preset vehicle multi-body dynamics model can be processed into a nonlinear finite element analysis model through finite element analysis software, that is, by applying nonlinear constraints and using rigid connection units RBE2. It can be understood that the above processing can enable the vehicle multi-body dynamics model to more accurately simulate the nonlinear behavior of the structural parts themselves and improve the accuracy of vehicle impact strength analysis.

[0067] Further, in one embodiment, the displacement information is transmitted to the target nonlinear finite element model in the interactive simulation model through the preset interactive point for simulation calculation to obtain the target stress value, including:

[0068] The displacement information is transmitted to a target nonlinear finite element model based on a first interaction point, the target nonlinear finite element model determines torque information based on the displacement information and transmits the torque information to a target vehicle multi-body dynamics model based on a second interaction point;

[0069] The displacement information is used as a boundary condition of a target nonlinear finite element model, so that the target nonlinear finite element model performs simulation calculation based on the boundary condition to obtain a target stress value.

[0070] Exemplarily, in the embodiments of the present application, boundary conditions are used to define how the model is constrained by external forces and deformations. Boundary conditions are very important in nonlinear finite element simulations, and they determine the calculation method and results of structural deformations. Specifically, when performing interactive simulations, the displacement information of each component at the first interaction point can be calculated through the target multi-body dynamics model and the displacement information can be transferred to the target nonlinear finite element model; secondly, the target nonlinear finite element model obtains torque information based on the displacement information, and then transfers the torque information to the target vehicle multi-body dynamics model through the second interaction point, and at the same time uses the displacement information as the boundary condition of the target nonlinear finite element model. After receiving the displacement boundary condition, the target nonlinear finite element model performs calculations, that is, simulates the stress and strain response of the material and structure under the boundary condition. The above simulation calculations can more accurately simulate the stress response of the vehicle or structure under actual dynamic conditions.

[0071] Further, in one embodiment, referring to Figure 3 As shown, the impact strength analysis result of the target vehicle is obtained based on the magnitude relationship between the target stress value and the preset stress value threshold, including:

[0072] Step S201: if the target stress value is less than a preset stress value threshold, the vehicle impact strength analysis result is determined to be that the vehicle impact strength meets the safety requirements;

[0073] Step S202: If the target stress value is greater than or equal to the preset stress value threshold, it is determined that the vehicle impact strength analysis result is that the vehicle impact strength does not meet the safety requirements.

[0074] Exemplarily, in the embodiment of the present application, the safety of the vehicle under a specific impact condition can be determined by comparing the magnitude relationship between the target stress value and the preset stress value threshold. Specifically, if the target stress value is less than the preset stress value threshold, it means that the stress level of the vehicle structure under the impact condition is lower than the safety limit required by the design. At this time, the vehicle can withstand the impact load without damage or excessive deformation. In other words, the impact strength of the target vehicle meets the safety requirements, the structural design is reasonable, and it has sufficient impact resistance. If the target stress value is greater than or equal to the preset stress value threshold, it means that the stress of the vehicle structure under the impact load has approached or exceeded the safety limit. At this time, the structure of the vehicle may be damaged, plastically deformed or fail, and there is a potential safety risk. In other words, the impact strength of the target vehicle does not meet the safety requirements, and structural improvement or design optimization is required to improve the impact resistance.

[0075] In a second aspect, an embodiment of the present application further provides a vehicle impact strength analysis system, the vehicle impact strength analysis system comprising:

[0076] A first processing module, which is used to input target parameters corresponding to the target vehicle into a preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters, and transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through a preset interactive point for simulation calculation to obtain a target stress value, wherein the target parameters include load conditions and control parameters, and the interactive point is an information transmission interface between the target vehicle multi-body dynamics model and the target nonlinear finite element model;

[0077] The second processing module is used to obtain the impact strength analysis result of the target vehicle based on the magnitude relationship between the target stress value and the preset stress value threshold.

[0078] Furthermore, in one embodiment, the first processing module is specifically configured to:

[0079] Establishing a plurality of first interaction points at the linear flexible body components in the preset whole vehicle multi-body dynamics model to obtain a target whole vehicle multi-body dynamics model;

[0080] Taking the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point, a target nonlinear finite element model is obtained, wherein the rigid connection unit is a connection unit corresponding to the connection area outside the linear flexible body;

[0081] The target vehicle multi-body dynamics model and the target nonlinear finite element model are used as interactive simulation models.

[0082] Furthermore, in one embodiment, the first processing module is further configured to:

[0083] A dummy object is created at each first interaction point to replace the linear flexible body interface and the linear flexible body connection relationship in the preset whole vehicle multi-body dynamics model with the dummy object.

[0084] Furthermore, in one embodiment, the first processing module is further configured to:

[0085] Nonlinear constraints of material, geometry and boundary conditions are applied to the nonlinear finite element model of the linear flexible body component in the preset whole vehicle multibody dynamics model, and the external connection area of ​​the linear flexible body component is modeled as a rigid connection unit to obtain the preset nonlinear finite element model.

[0086] Furthermore, in one embodiment, the first processing module is further configured to:

[0087] The displacement information is transmitted to a target nonlinear finite element model based on a first interaction point, the target nonlinear finite element model determines torque information based on the displacement information and transmits the torque information to a target vehicle multi-body dynamics model based on a second interaction point;

[0088] The displacement information is used as a boundary condition of a target nonlinear finite element model, so that the target nonlinear finite element model performs simulation calculation based on the boundary condition to obtain a target stress value.

[0089] Furthermore, in one embodiment, the second processing module is specifically configured to:

[0090] If the target stress value is less than a preset stress value threshold, the vehicle impact strength analysis result is determined to be that the vehicle impact strength meets the safety requirements;

[0091] If the target stress value is greater than or equal to the preset stress value threshold, the vehicle impact strength analysis result is determined to be that the vehicle impact strength does not meet the safety requirements.

[0092] The present application inputs target parameters including load conditions and control parameters corresponding to the target vehicle into a preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters. The target vehicle multi-body dynamics model transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through the interactive points used for information transmission for simulation calculation to obtain the target stress value. The target vehicle multi-body dynamics model introduces a nonlinear finite element model to simulate nonlinear behaviors such as plastic deformation and buckling under extreme working conditions such as impact and collision through data exchange at the interactive points, thereby overcoming the defect that the traditional vehicle multi-body dynamics model cannot simulate the nonlinear behavior of the structural components themselves under extreme working conditions. Moreover, by combining the target vehicle multi-body dynamics model with the target nonlinear finite element model, the problem of low efficiency caused by directly solving the coupling solution of the vehicle and the road finite element model is effectively avoided, and the computational efficiency of the nonlinear finite element solution is fully improved. The impact strength analysis result of the target vehicle is obtained based on the size relationship between the target stress value and the preset stress value threshold, so that the impact strength of the vehicle can be quickly and accurately judged, further improving the accuracy and efficiency of the simulation analysis.

[0093] Among them, the functional implementation of each module in the above-mentioned vehicle impact strength analysis system corresponds to each step in the above-mentioned vehicle impact strength analysis method embodiment, and its functions and implementation processes are no longer repeated here one by one.

[0094] In a third aspect, an embodiment of the present application provides a vehicle impact strength analysis device, which may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0095] Reference Figure 4 , Figure 4Schematic diagram of the hardware structure of the vehicle impact strength analysis device involved in the embodiment of the present application. In the embodiment of the present application, the vehicle impact strength analysis device may include a processor, a memory, a communication interface and a communication bus.

[0096] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0097] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the vehicle impact strength analysis device, and the interface used to realize the interconnection of the vehicle impact strength analysis device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0098] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0099] The processor may be a general-purpose processor, which may call the vehicle impact strength analysis program stored in the memory and execute the vehicle impact strength analysis method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the vehicle impact strength analysis program is called may refer to the various embodiments of the vehicle impact strength analysis method of the present application, which will not be described in detail here.

[0100] Those skilled in the art will understand that Figure 4 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0101] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0102] A vehicle impact strength analysis program is stored on the readable storage medium of the present application, wherein when the vehicle impact strength analysis program is executed by a processor, the steps of the vehicle impact strength analysis method as described above are implemented.

[0103] Among them, the method implemented when the vehicle impact strength analysis program is executed can refer to the various embodiments of the vehicle impact strength analysis method of the present application, and will not be repeated here.

[0104] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0105] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0106] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0107] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0108] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0109] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0110] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vehicle impact strength analysis method, characterized in that: The vehicle impact strength analysis method comprises: Input the target parameters corresponding to the target vehicle into a preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters, and transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through a preset interactive point for simulation calculation to obtain a target stress value, wherein the target parameters include load conditions and control parameters, and the interactive point is an information transmission interface between the target vehicle multi-body dynamics model and the target nonlinear finite element model; The impact strength analysis result of the target vehicle is obtained based on the magnitude relationship between the target stress value and the preset stress value threshold.

2. The vehicle impact strength analysis method according to claim 1, characterized in that: The interaction point includes a first interaction point and a second interaction point. Before the step of inputting the target parameters corresponding to the target vehicle into the preset interaction simulation model, the method further includes: Establishing a plurality of first interaction points at the linear flexible body components in the preset whole vehicle multi-body dynamics model to obtain a target whole vehicle multi-body dynamics model; Taking the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point, a target nonlinear finite element model is obtained, wherein the rigid connection unit is a connection unit corresponding to the connection area outside the linear flexible body; The target vehicle multi-body dynamics model and the target nonlinear finite element model are used as interactive simulation models.

3. The vehicle impact strength analysis method according to claim 2, characterized in that: After the step of establishing a plurality of first interaction points at the linear flexible body components in the preset vehicle multi-body dynamics model, the method further includes: A dummy object is created at each first interaction point to replace the linear flexible body interface and the linear flexible body connection relationship in the preset whole vehicle multi-body dynamics model with the dummy object.

4. The vehicle impact strength analysis method according to claim 2, characterized in that: Before the step of using the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point, the method further includes: Nonlinear constraints of material, geometry and boundary conditions are applied to the nonlinear finite element model of the linear flexible body component in the preset whole vehicle multibody dynamics model, and the external connection area of ​​the linear flexible body component is modeled as a rigid connection unit to obtain the preset nonlinear finite element model.

5. The vehicle impact strength analysis method according to claim 2, characterized in that: The method of transmitting the displacement information to the target nonlinear finite element model in the interactive simulation model through the preset interactive point for simulation calculation to obtain the target stress value includes: The displacement information is transmitted to a target nonlinear finite element model based on a first interaction point, the target nonlinear finite element model determines torque information based on the displacement information and transmits the torque information to a target vehicle multi-body dynamics model based on a second interaction point; The displacement information is used as a boundary condition of a target nonlinear finite element model, so that the target nonlinear finite element model performs simulation calculation based on the boundary condition to obtain a target stress value.

6. The vehicle impact strength analysis method according to claim 1, characterized in that: The step of obtaining the impact strength analysis result of the target vehicle based on the magnitude relationship between the target stress value and the preset stress value threshold value includes: If the target stress value is less than a preset stress value threshold, the vehicle impact strength analysis result is determined to be that the vehicle impact strength meets the safety requirements; If the target stress value is greater than or equal to the preset stress value threshold, the vehicle impact strength analysis result is determined to be that the vehicle impact strength does not meet the safety requirements.

7. A vehicle impact strength analysis system, characterized in that: The vehicle impact strength analysis system comprises: A first processing module, which is used to input target parameters corresponding to the target vehicle into a preset interactive simulation model, so that the target vehicle multi-body dynamics model in the interactive simulation model generates displacement information based on the target parameters, and transmits the displacement information to the target nonlinear finite element model in the interactive simulation model through a preset interactive point for simulation calculation to obtain a target stress value, wherein the target parameters include load conditions and control parameters, and the interactive point is an information transmission interface between the target vehicle multi-body dynamics model and the target nonlinear finite element model; The second processing module is used to obtain the impact strength analysis result of the target vehicle based on the magnitude relationship between the target stress value and the preset stress value threshold.

8. The vehicle impact strength analysis system according to claim 7, characterized in that: The first processing module is specifically used for: Establishing a plurality of first interaction points at the linear flexible body components in the preset whole vehicle multi-body dynamics model to obtain a target whole vehicle multi-body dynamics model; Taking the main node of the rigid connection unit in the preset nonlinear finite element model as the second interaction point, a target nonlinear finite element model is obtained, wherein the rigid connection unit is a connection unit corresponding to the connection area outside the linear flexible body; The target vehicle multi-body dynamics model and the target nonlinear finite element model are used as interactive simulation models.

9. A vehicle impact strength analysis device, characterized in that: The vehicle impact strength analysis device includes a processor, a memory, and a vehicle impact strength analysis program stored in the memory and executable by the processor, wherein when the vehicle impact strength analysis program is executed by the processor, the steps of the vehicle impact strength analysis method as described in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a vehicle impact strength analysis program, wherein when the vehicle impact strength analysis program is executed by a processor, the steps of the vehicle impact strength analysis method according to any one of claims 1 to 6 are implemented.

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