Simplified methods, equipment, and storage media for vehicle models used in crash simulation analysis

Abstract

This invention provides a simplified method, device, and storage medium for automobile models used in collision simulation analysis, belonging to the field of device model simplification technology. This simplified automobile model discretizes the vehicle model modules for each leg impact position, reflecting the shape characteristics and crush stiffness of each module. Each module is simplified to a combination of a rigid feature surface, nonlinear spring elements, and a rigid fixed plane. Using this simplified method, a simplified vehicle model can be obtained after any leg impact position. Applying this simplified model, the impact of shape changes on leg impact performance can be investigated by altering the front-end shape. The nonlinear crush stiffness of the discrete modules of the vehicle model can be simulated using nonlinear spring element stiffness, and the impact of vehicle structural stiffness on leg impact performance can be studied by changing the crush stiffness curve. This simplified method shortens computation time, improves computational efficiency, and facilitates rapid parameter adjustments for studying collision patterns.

Description

Technical Field

[0001] This invention belongs to the field of equipment model simplification technology, specifically relating to a simplification method, equipment, and storage medium for automobile models used in pedestrian leg collision simulation analysis. Background Technology

[0002] Vehicle safety is an inherent attribute of automobiles. With the continuous increase in car ownership and the rise in traffic accidents, consumers are paying increasing attention to vehicle safety year by year. In recent years, thanks to the continuous development of automotive safety regulations and technologies, the safety performance of vehicle occupants has improved significantly. Pedestrian protection in traffic accidents is receiving increasing attention, and domestic car brands selling their models in overseas markets must undergo mandatory inspections and certifications under local pedestrian protection regulations to be qualified for sale. These pedestrian protection regulations all include two components: head impact performance and leg impact performance. Regarding leg impact performance, leg impact collision models are constantly being upgraded, and the difficulty is gradually increasing.

[0003] In traditional product development, assessing leg protection performance for pedestrians typically requires extensive simulation work. This involves studying the impact of factors such as shape, space, and structural stiffness on leg collision performance, obtaining leg collision mechanisms, and summarizing leg collision patterns to support the development of product leg protection performance. Currently, traditional simulation methods based on detailed finite element models of vehicles have the following two main shortcomings:

[0004] (1) Low computational efficiency and long computation cycle:

[0005] Traditional leg-type simulation analysis uses detailed vehicle finite element models for analysis and calculation. These models contain detailed vehicle structures, including body-in-white assemblies, hood assemblies, front bumper fascia assemblies, radiator grille assemblies, combination light assemblies, cooling module assemblies, and front engine compartment assemblies. Detailed vehicle finite element models have a large number of nodes and elements, usually exceeding one million, with complex contact types, resulting in long calculation times and low computational efficiency.

[0006] (2) Poor parameterization adjustability:

[0007] Based on a detailed finite element model of a vehicle, it is difficult to make batch adjustments to the vehicle's shape, space, stiffness, etc. The shape and space adjustments usually require a lot of mesh generation and finite element model building work, and there is usually a large model interference, which seriously affects the calculation accuracy and stability. At the same time, the calculation takes a long time, which is not convenient for conducting a large number of parametric adjustments to study the laws.

[0008] Traditional simulation methods typically require significant computation time. To address this, automakers are continuously exploring equivalent simplification methods for vehicle models to facilitate rapid simulation analysis. Current simplified models often reduce the vehicle to a three-section structure to simulate typical energy-absorbing structures such as the hood, bumper beam, and pedestrian protection lower guard plate. However, existing equivalent models do not consider vehicle styling features. This method can only simulate changes in the front leg impact space and support height, neglecting the influence of styling features on leg impact behavior. Furthermore, accurately simulating the overall vehicle structural crush stiffness using only a three-section structure results in poor computational accuracy. It also hinders parameterized adjustment of structural stiffness, impeding batch simulation analysis and reducing computational efficiency. Additionally, existing simplified models often borrow portions from real vehicle models, resulting in fixed stiffness characteristics and making it difficult to adjust vehicle structural stiffness, thus hindering research on the impact of structural stiffness variations on leg impact performance.

[0009] Therefore, a simplified method for vehicle models is needed to improve computational efficiency, shorten computation time, facilitate parameter adjustment, and conduct regularity research based on a large amount of simulation data. Summary of the Invention

[0010] To address the problems of long calculation time, low computational efficiency, and difficulty in parameter adjustment research in existing vehicle finite element models and leg collision simulations, this invention provides a simplified method, device, and storage medium for vehicle models used in leg collision simulation analysis for pedestrian protection. This simplified vehicle model discretizes the vehicle model modules for each leg impact location, reflecting the shape features and crush stiffness of each module in as much detail as possible. Each module is simplified into a combination of a rigid feature surface, a nonlinear spring element, and a rigid fixed plane.

[0011] This invention is achieved through the following technical solution:

[0012] The simplified method for car models in collision simulation analysis includes the following steps:

[0013] Step S1: Discretize the finite element model of the vehicle into several 100mm*100mm square modules;

[0014] Step S2: Simplify the front, rear and middle structures of the vehicle by dividing the discrete square modules in the finite element model of the vehicle into three parts.

[0015] Step S3: Create a simplified model in the finite element software;

[0016] The simplified rigid feature surface, nonlinear spring element, and rigid fixed plane after step S2 are created and connected in the finite element analysis software to complete the construction of the simplified vehicle model. This simplified model is used to carry out leg-type collision simulation analysis.

[0017] Furthermore, the discretization of the vehicle model described in step S1 is specifically carried out as follows:

[0018] Step S11: Lateral discretization of the vehicle model:

[0019] Discretize the finite element model of the vehicle directly in front of the leg shape from left to right at 100mm intervals.

[0020] Step S12: Vertical discretization of the vehicle model:

[0021] The finite element model of the vehicle directly in front of the legs is discretized from top to bottom at 100mm intervals, and the finite element model of the vehicle is discretized into several 100mm*100mm square modules.

[0022] Furthermore, the simplification of the vehicle's front, rear, and middle structures by dividing the discrete square modules in the finite element model of the vehicle in step S2 is as follows:

[0023] Step S21: In the finite element model of the vehicle, the front surfaces of the front bumper assembly, radiator grille assembly, and combination light assembly, which involve the front styling of the vehicle, are simplified into styling rigid feature surfaces.

[0024] Step S22: During the leg-shaped impact on the vehicle, the structure at the rear of the vehicle that is far from the collision interface and does not deform or move is simplified to a rigid fixed plane.

[0025] Step S23: All deformable parts in the middle of the vehicle are simplified to nonlinear spring elements. The stiffness of the nonlinear spring elements is the crushing stiffness of the deformable parts in the middle.

[0026] Furthermore, the distance from the rear of the vehicle to the collision interface mentioned in step S22 is a position 300mm or more from the front of the vehicle along the length of the vehicle.

[0027] Furthermore, the deformable body mentioned in step S23 is a front bumper bracket, an air deflector, a pedestrian guard, a front frame, a cooling module, and a cabin assembly.

[0028] Furthermore, the stiffness of the nonlinear spring element in step S23 is obtained in the following way:

[0029] First, a finite element model of the vehicle is obtained. Then, a rigid surface is set in front of the finite element model of the vehicle. The rigid surface is used to impact discrete square modules at a constant distance and constant speed. Based on the calculation results, the crushing force F of each discrete square module and the displacement information x of the rigid surface during the collision are extracted. The relationship curve between crushing force and displacement F=k(x)x is obtained, which is the crushing stiffness curve, which can simulate the crushing stiffness of the discrete square modules of the vehicle in the x direction.

[0030] Furthermore, the finite element model of the vehicle includes models of the body-in-white assembly, engine hood assembly, front bumper hood assembly, radiator grille assembly, combination light assembly, cooling module assembly, and front engine compartment assembly, and maintains correct connection and contact relationships.

[0031] Furthermore, step S3, which involves creating a simplified model in the finite element software, specifically involves creating and establishing connections between the simplified rigid feature surfaces, nonlinear spring elements, and rigid fixed planes in the finite element analysis software to complete the construction of the simplified vehicle model. This includes the following steps:

[0032] (1) In the finite element software, the geometric data of the outer surface of the shape is segmented and discretized. Within the finite element model of the vehicle with a width of 100mm, the data is discretized from top to bottom at intervals of 100mm. The data is discretized into several 100mm*100mm square modules. The data of each square module is meshed to obtain the finite element mesh of the shape feature surface.

[0033] (2) Assign rigid body material and thickness to the finite element mesh of several shape feature surfaces, and impose degree of freedom constraints, restricting the rotational degrees of freedom in the x, y, and z directions and the translational degrees of freedom in the y and z directions, allowing only the shape rigid feature surfaces to move along the x direction.

[0034] (3) Create a nonlinear spring element DISCRETE behind each rigid feature surface of the shape, with an element length of 300mm;

[0035] (4) Create a planar mesh at the end of the nonlinear spring element. The mesh is given rigid body material and thickness, and constrains all rotational and translational degrees of freedom.

[0036] (5) The nodes at both ends of the nonlinear spring unit are connected to the rigid feature surface of the shape and the rigid fixed plane through extra nodes, respectively.

[0037] (6) Assign the crushing stiffness curve to the nonlinear spring element;

[0038] (7) Finally, a simplified vehicle model with the leg-shaped impact position is obtained.

[0039] Secondly, embodiments of the present invention also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a simplified method for crash simulation analysis of a car model as described in any of the embodiments of the present invention.

[0040] Thirdly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a simplified method for a car model for collision simulation analysis as described in any of the embodiments of the present invention.

[0041] Compared with the prior art, the advantages of the present invention are as follows:

[0042] This invention discloses a simplified method, device, and storage medium for vehicle models used in pedestrian leg impact simulation analysis. The simplified method yields a simplified vehicle model after any leg impact position. Using this simplified model, the impact of changes in the front-end shape on leg impact performance can be investigated. The nonlinear crush stiffness of the discrete modules of the vehicle model is simulated using nonlinear spring element stiffness, and the influence of vehicle structural stiffness on leg impact performance can be studied by altering the crush stiffness curve. This simplified vehicle model method shortens computation time, improves computational efficiency, and facilitates rapid parameter adjustments for studying collision patterns. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0044] Figure 1 This is a flowchart illustrating the simplified method for collision simulation analysis of a car model according to the present invention.

[0045] Figure 2 This is a schematic diagram of the discrete vehicle model of this invention;

[0046] Figure 3 This is a schematic diagram illustrating the stiffness calculation of the nonlinear spring unit of the present invention;

[0047] Figure 4 A schematic diagram of the equivalent model of the impact location of a certain leg type;

[0048] Figure 5 This is a discrete schematic diagram of the L0 position of a certain vehicle model;

[0049] Figure 6 A schematic diagram for calculating the crush stiffness at position L0 of a certain vehicle model;

[0050] Figure 7 A schematic diagram of the crush stiffness curves of 7 discrete modules at position L0 of a certain vehicle model;

[0051] Figure 8 This is a schematic diagram of the structure of an electronic device in Embodiment 2 of the present invention. Detailed Implementation

[0052] To clearly and completely describe the technical solution and its specific working process of the present invention, the specific embodiments of the present invention are as follows, in conjunction with the accompanying drawings:

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] like Figure 1 As shown, the embodiment provides a simplified method for car models in collision simulation analysis, specifically including the following steps:

[0055] Step S1: Discretize the finite element model of the vehicle into several 100mm*100mm square modules;

[0056] like Figure 2 As shown, step S2: simplify the front, rear and middle structures of the vehicle by dividing the discrete square modules in the finite element model of the vehicle into three parts.

[0057] Step S3: Create a simplified model in the finite element software;

[0058] The simplified rigid feature surface, nonlinear spring element, and rigid fixed plane after step S2 are created and connected in the finite element analysis software to complete the construction of the simplified vehicle model. This simplified model is used to carry out leg-type collision simulation analysis.

[0059] Furthermore, the discretization of the vehicle model described in step S1 is specifically carried out as follows:

[0060] Step S11: Lateral discretization of the vehicle model:

[0061] Discretize the finite element model of the vehicle directly in front of the leg shape from left to right at 100mm intervals.

[0062] Step S12: Vertical discretization of the vehicle model:

[0063] The finite element model of the vehicle directly in front of the legs is discretized from top to bottom at 100mm intervals, and the finite element model of the vehicle is discretized into several 100mm*100mm square modules.

[0064] Furthermore, the simplification of the vehicle's front, rear, and middle structures by dividing the discrete square modules in the finite element model of the vehicle in step S2 is as follows:

[0065] Step S21: In the finite element model of the vehicle, the front surfaces of the front bumper assembly, radiator grille assembly, and combination light assembly, which involve the front styling of the vehicle, are simplified into styling rigid feature surfaces.

[0066] Step S22: During the leg-shaped impact on the vehicle, the structure at the rear of the vehicle that is far from the collision interface and does not deform or move is simplified to a rigid fixed plane.

[0067] Step S23: All deformable parts in the middle of the vehicle are simplified to nonlinear spring elements. The stiffness of the nonlinear spring elements is the crushing stiffness of the deformable parts in the middle.

[0068] Furthermore, the distance from the rear of the vehicle to the collision interface mentioned in step S22 is a position 300mm or more from the front of the vehicle along the length of the vehicle.

[0069] Furthermore, the deformable body mentioned in step S23 is a front bumper bracket, an air deflector, a pedestrian guard, a front frame, a cooling module, and a cabin assembly.

[0070] Furthermore, the stiffness of the nonlinear spring element in step S23 is obtained in the following way:

[0071] like Figure 3 and Figure 6 As shown, firstly, a finite element model of the vehicle is obtained. Then, a rigid surface is set directly in front of the finite element model of the vehicle. The rigid surface is used to impact discrete square modules at a constant distance and constant speed. Based on the calculation results, the crushing force F of each discrete square module and the displacement information x of the rigid surface during the collision are extracted. The relationship curve between crushing force and displacement, F = k(x)x, is obtained, which is the crushing stiffness curve. This curve can simulate the x-direction crushing stiffness of the discrete square modules of the vehicle. Figure 7 As shown.

[0072] Furthermore, the finite element model of the vehicle includes models of the body-in-white assembly, engine hood assembly, front bumper hood assembly, radiator grille assembly, combination light assembly, cooling module assembly, and front engine compartment assembly, and maintains correct connection and contact relationships.

[0073] Furthermore, step S3, which involves creating a simplified model in the finite element software, specifically involves creating and establishing connections between the simplified rigid feature surfaces, nonlinear spring elements, and rigid fixed planes in the finite element analysis software to complete the construction of the simplified vehicle model. This includes the following steps:

[0074] like Figure 4 and Figure 5 As shown, (1) the geometric data of the outer surface of the shape is segmented and discretized in the finite element software. Within the finite element model of the vehicle with a width of 100mm, the data is discretized from top to bottom at intervals of 100mm. The data is discretized into several 100mm*100mm square modules. The data of each square module is meshed to obtain the finite element mesh of the shape feature surface.

[0075] (2) Assign rigid body material and thickness to the finite element mesh of several shape feature surfaces, and impose degree of freedom constraints, restricting the rotational degrees of freedom in the x, y, and z directions and the translational degrees of freedom in the y and z directions, allowing only the shape rigid feature surfaces to move along the x direction.

[0076] (3) Create a nonlinear spring element DISCRETE behind each rigid feature surface of the shape, with an element length of 300mm;

[0077] (4) Create a planar mesh at the end of the nonlinear spring element. The mesh is given rigid body material and thickness, and constrains all rotational and translational degrees of freedom.

[0078] (5) The nodes at both ends of the nonlinear spring unit are connected to the rigid feature surface of the shape and the rigid fixed plane through extra nodes, respectively.

[0079] (6) Assign the crushing stiffness curve to the nonlinear spring element;

[0080] (7) Finally, a simplified vehicle model with the leg-shaped impact position is obtained.

[0081] Example 1

[0082] like Figure 1 As shown, this implementation case uses a certain car model and the L0 position specified in C-NCAP as an example to explain in detail the simplified method of the car model, as follows:

[0083] The simplified method for car models in collision simulation analysis includes the following steps:

[0084] Step S1: Discretize the vehicle model into several 100mm*100mm square modules, such as... Figure 5 As shown;

[0085] (1) Lateral discretization of the vehicle model:

[0086] When the leg collidees with the vehicle at position L0, the main contact range between the leg and the vehicle is y = -50 to +50 mm. Therefore, for the L0 position collision study, the width range of 100 mm for the vehicle is simplified to y = -50 to +50 mm.

[0087] (2) Vertical discretization of the vehicle model:

[0088] Within a vehicle model area with a width of 100mm (y = -50 to +50mm), the vehicle is discretized into 7 square modules of 100mm each, spaced 100mm apart from top to bottom.

[0089] Step S2: Simplify the vehicle discrete modules. Simplify the seven discrete modules as described above. The simplification methods for the front, rear, and middle parts of the vehicle in each discrete module are as follows:

[0090] (1) In the finite element model of the vehicle, the front surfaces of the front bumper mask assembly, radiator grille assembly, combination lamp assembly, etc., which involve the front styling of the vehicle are simplified to the styling rigid feature surfaces.

[0091] (2) During the impact of a leg-type vehicle, the structure at the rear of the vehicle that is far from the collision interface does not deform or move and is simplified to a rigid fixed plane.

[0092] In this embodiment, the length of the vehicle structure that deforms during the collision between the leg and the vehicle is 300mm. Therefore, the structure 300mm after the leg comes into contact with the vehicle is simplified to a rigid fixed plane.

[0093] (3) Except for the rigid feature surface of the front end of the vehicle and the rigid fixed plane of the rear end, all deformable bodies in the middle of the vehicle, including the front bumper bracket, air deflector, pedestrian guard plate, front frame, cooling module, engine compartment assembly, etc., are simplified to nonlinear spring units.

[0094] In this embodiment, the structural length of all deformable parts of the vehicle is 300mm, so the 300mm long deformable part is simplified into a nonlinear spring unit; the stiffness of this nonlinear spring unit is assigned to the crushing stiffness of the middle deformable part.

[0095] In this embodiment, the crush stiffness of the central deformable body is obtained in the following way:

[0096] First, obtain a detailed and accurate finite element model of the vehicle, including detailed models of the body-in-white assembly, engine hood assembly, front bumper fascia assembly, radiator grille assembly, combination light assembly, cooling module assembly, and front engine compartment assembly, and maintain the correct connection and contact relationships.

[0097] Then, seven 100mm*100mm rigid surfaces are set directly in front of the vehicle finite element model, and the rigid surfaces are adjusted to... Figure 5 The vehicle model is divided into 100mm*100mm square modules at positions ① to ⑦; and all degrees of freedom of the tire positions in the finite element model of the vehicle are constrained to ensure that the vehicle model is in a static state. Seven 100mm*100mm rigid surfaces are set to impact the vehicle at a constant speed of 40km / h, with an impact distance of 300mm. Figure 6 As shown; in the calculation model, seven rigid surfaces are set to make surface-to-surface contact with the vehicle model, and seven crushing forces are output in the calculation results; after the calculation, the crushing force F and the displacement information x of the rigid surface when the vehicle collides with each 100mm*100mm rigid surface are extracted, and the relationship curve between crushing force and displacement F=k(x)x is obtained, that is, the crushing stiffness curve, as shown. Figure 7 As shown, the x-axis crushing stiffness of the 100mm*100mm discrete module of the vehicle can be simulated.

[0098] Step S3: Create a simplified vehicle model in the finite element software;

[0099] The simplified rigid feature surfaces, nonlinear spring elements, and rigid fixed planes are created and connected in the finite element analysis software to complete the construction of the simplified vehicle model. The specific operations are as follows (taking Hypermesh and LS-DYNA as examples):

[0100] (1) In Hypermesh software, the geometric data of the outer surface of the model is segmented and discretized. Within the vehicle model with a width of 100mm (y=-50—+50mm), the data is discretized from top to bottom at intervals of 100mm. The data is discretized into 7 square modules of 100mm*100mm. The data of each square module is meshed to obtain the finite element mesh of the model feature surface.

[0101] (2) Assign the obtained 7 parts of the shape feature surface mesh to rigid body material No. 20 with a thickness of 1mm, and impose degree of freedom constraints, restricting the rotational degrees of freedom in the three directions of x, y, and z and the translational degrees of freedom in the two directions of y and z, and only allowing the shape rigid feature surface to move along the x direction.

[0102] (3) Create a nonlinear spring element DISCRETE behind each rigid feature surface of the shape, with an element length of 300mm;

[0103] (4) Create a planar mesh at the end of the nonlinear spring element, assign the mesh to rigid body material No. 20 with a thickness of 1 mm, and constrain all rotational and translational degrees of freedom.

[0104] (5) The nodes at both ends of the nonlinear spring unit are connected to the rigid feature surface of the shape and the rigid fixed plane through extra nodes, respectively.

[0105] (6) Figure 7 The crushing stiffness curve in the text gives nonlinear spring elements;

[0106] Using the above simplification method, a simplified vehicle model of the L0 position in a leg impact was obtained;

[0107] The simplified vehicle model has a significantly reduced number of elements compared to a detailed finite element model of a vehicle, thus greatly shortening the computation time and significantly improving computational efficiency.

[0108] The simplified model reduces complex shapes and structures to rigid surfaces and complex mid-vehicle deformation structures to nonlinear spring elements. This simplifies the process of adjusting shapes and structural stiffness from meshing and building numerous components in a detailed finite element model to adjusting the shapes and stiffness parameters of the nonlinear spring elements. This makes the operation more convenient and is particularly suitable for quickly studying the impact of shapes and structural stiffness on collision performance.

[0109] The stiffness of the nonlinear spring element in the simplified model is obtained by crushing the actual vehicle through a detailed finite element model. Compared with a simple linear spring damping element, it can better reflect the nonlinear stiffness characteristics during the vehicle collision process.

[0110] Example 2

[0111] Figure 8 This is a schematic diagram of the structure of a computer device in Embodiment 2 of the present invention. Figure 8 A block diagram of an exemplary computer device 12 suitable for implementing embodiments of the present invention is shown. Figure 8 The computer device 12 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0112] like Figure 8 As shown, the computer device 12 is represented in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, system memory 28, and a bus 18 connecting different system components (including system memory 28 and processing unit 16).

[0113] Bus 18 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. For example, these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0114] Computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0115] System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. Computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be used to read and write non-removable, non-volatile magnetic media (…). Figure 3 Not shown; usually referred to as a "hard drive"). Although Figure 3 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 via one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0116] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include—but are not limited to—an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 42 typically perform the functions and / or methods described in the embodiments of the present invention.

[0117] The computer device 12 can also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), and with one or more devices that enable a user to interact with the computer device 12, and / or with any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network card, modem, etc.). This communication can be performed via the input / output (I / O) interface 22. Furthermore, in this embodiment, the display 24 of the computer device 12 is not an independent entity, but is embedded in a mirror, so that when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface visually blend together. Additionally, the computer device 12 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via the network adapter 20. As shown, the network adapter 20 communicates with other modules of the computer device 12 via the bus 18. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0118] The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, such as implementing the simplified method for crash simulation analysis of a car model provided in the embodiments of the present invention.

[0119] Example 3

[0120] Embodiment 3 of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a simplified method for collision simulation analysis of a car model as provided in all embodiments of the present application.

[0121] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0122] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0123] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0124] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0125] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0126] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0127] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A simplified method for automobile models in collision simulation analysis, characterized in that, Specifically, the steps include the following: Step S1: Discretize the finite element model of the vehicle into several 100mm*100mm square modules; Step S2: Simplify the front, rear and middle structures of the vehicle by dividing the discrete square modules in the finite element model of the vehicle into three parts. Step S3: Create a simplified model in the finite element software; The simplified rigid feature surface, nonlinear spring element, and rigid fixed plane after step S2 are created and connected in the finite element analysis software to complete the construction of the simplified vehicle model. This simplified model is used to carry out leg collision simulation analysis. The discretization of the vehicle model described in step S1 is as follows: Step S11: Lateral discretization of the vehicle model: Discretize the finite element model of the vehicle directly in front of the leg shape from left to right at 100mm intervals. Step S12: Vertical discretization of the vehicle model: The finite element model of the vehicle directly in front of the leg is discretized from top to bottom at 100mm intervals, and the finite element model of the vehicle is discretized into several 100mm*100mm square modules. Step S2 involves simplifying the front, rear, and middle structures of the vehicle by dividing the discrete square modules in the finite element model of the vehicle. The specific steps are as follows: Step S21: In the finite element model of the vehicle, the front surfaces of the front bumper assembly, radiator grille assembly, and combination light assembly, which involve the front styling of the vehicle, are simplified into styling rigid feature surfaces. Step S22: During the leg-shaped impact on the vehicle, the structure at the rear of the vehicle that is far from the collision interface and does not deform or move is simplified to a rigid fixed plane. Step S23: All deformable parts in the middle of the vehicle are simplified to nonlinear spring elements. The stiffness of the nonlinear spring elements is the crushing stiffness of the deformable parts in the middle. The distance between the rear of the vehicle and the collision interface mentioned in step S22 is 300mm or more from the front of the vehicle along the length of the vehicle. The deformable body mentioned in step S23 includes a front bumper bracket, an air deflector, a pedestrian guard, a front frame, a cooling module, and a cabin assembly. The stiffness of the nonlinear spring element in step S23 is obtained in the following way: First, a finite element model of the vehicle is obtained. Then, a rigid surface is set in front of the finite element model of the vehicle. The rigid surface is used to impact discrete square modules at a constant distance and constant speed. Based on the calculation results, the crushing force F of each discrete square module and the displacement information x of the rigid surface during the collision are extracted. The relationship curve between crushing force and displacement F=k(x)x is obtained, which is the crushing stiffness curve, which can simulate the crushing stiffness of the discrete square modules of the vehicle in the x direction. The finite element model of the vehicle includes the body-in-white assembly, engine hood assembly, front bumper hood assembly, radiator grille assembly, combination light assembly, cooling module assembly, and front engine compartment assembly model, and maintains the correct connection and contact relationships. Step S3, which describes creating a simplified model in the finite element software, specifically involves creating and establishing connections between the simplified rigid feature surfaces, nonlinear spring elements, and rigid fixed planes in the finite element analysis software to complete the construction of the simplified vehicle model. This includes the following steps: (1) In the finite element software, the geometric data of the outer surface of the shape is segmented and discretized. Within the finite element model of the vehicle with a width of 100mm, the data is discretized from top to bottom at intervals of 100mm. The data is discretized into several 100mm*100mm square modules. The data of each square module is meshed to obtain the finite element mesh of the shape feature surface. (2) Assign rigid body material and thickness to the finite element mesh of the obtained shape feature surfaces, and impose degree of freedom constraints, restricting the rotational degrees of freedom in the x, y, and z directions and the translational degrees of freedom in the y and z directions, allowing only the shape rigid feature surfaces to move along the x direction. (3) Establish a nonlinear spring element DISCRETE behind each rigid feature surface of the shape, with an element length of 300mm; (4) Create a planar mesh at the end of the nonlinear spring element. The mesh is given rigid body material and thickness, and constrains all rotational and translational degrees of freedom. (5) The nodes at both ends of the nonlinear spring unit are connected to the rigid feature surface of the shape and the rigid fixed plane through extranodes, respectively. (6) Assign the crushing stiffness curve to the nonlinear spring element; (7) Finally, a simplified vehicle model with the leg-shaped impact position is obtained.

2. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the simplified method for crash simulation analysis of a car model as described in claim 1.

3. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the simplified method for crash simulation analysis of a car model as described in claim 1.

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