CN117034681A

CN117034681A - Method, device, terminal and storage medium for analyzing dent resistance of automobile body outer panel

Info

Publication number: CN117034681A
Application number: CN202310856911.3A
Authority: CN
Inventors: 王宁; 于保君; 何洪军; 孙立伟; 肖永富; 刘启龙; 杜伟娟
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2023-07-13
Filing date: 2023-07-13
Publication date: 2023-11-10

Abstract

The application relates to a method, a device, a terminal and a storage medium for analyzing the dent resistance of an automobile body outer covering part. Comprising the following steps: 1. inputting an outer covering piece and a pressure head finite element model, and establishing constraint; 2. uniformly arranging loading points on the surface of the identified outer covering piece; 3. automatically analyzing the dent resistance of each point; 4. judging whether risk points exist or not; 5. if the risk points exist in the first-round loading points, the encryption loading points are newly added around the risk points, and if the risk points do not exist in the first-round loading points, the loading points are newly added at the spare positions of the original loading points; 6. automatically analyzing and judging the dent resistance of the newly added loading point; 7. and determining the position and the shape of the reinforced structure according to the comprehensive risk point positions. The self-adaptive point distribution mode progressive layer by layer can accurately and efficiently find the risk area of the outer covering part and perform quick optimization design, meanwhile, the analysis efficiency is effectively improved by combining an automatic method, and the problems of poor accuracy and the like caused by the randomness of manual point selection or inherent thinking are avoided.

Description

Method, device, terminal and storage medium for analyzing dent resistance of automobile body outer panel

Technical Field

The application belongs to the technical field of automobiles, and particularly relates to a method, a device, a terminal and a storage medium for analyzing the dent resistance of an automobile body outer covering part.

Background

The dent resistance of the automobile body outer covering piece is an important index for evaluating the performance of the whole automobile, and the automobile body outer covering piece is easy to generate visual bending, dent and even permanent deformation under the action of external loads with strong randomness such as artificial pressing, touching, hail, stones and the like, so that the overall evaluation of the automobile by a user is influenced. Therefore, the anti-dent performance of the outer covering part of the automobile body is necessary to be fully considered in the design of the automobile, and along with the rapid development of the automobile industry, the development period of the automobile type is shortened year by year, the requirements on the simulation analysis precision and the efficiency are higher and higher, the risk area of the outer covering part is accurately and efficiently found, and the rapid optimization design can effectively support the development process of the product.

In the prior art, in the anti-dent performance analysis process of the automobile body outer covering part, loading points are generally selected directly according to experience of engineering personnel or are selected according to rules formulated for the outer surface with a more regular shape, randomness is high, or the selected positions are easily influenced by inherent thinking, the selected positions can not necessarily represent the area with the worst anti-dent performance, the risk of quality problems in the subsequent actual use process is high, some technologies have complicated calculation flow and more analysis points although the points are selected comprehensively, global linear finite element analysis is required to be additionally carried out before the anti-dent performance analysis, actual loading points still need to be manually screened in the middle, and the calculation efficiency is low.

Disclosure of Invention

The application provides a method, a device, a terminal and a storage medium for analyzing the concavity resistance of an outer covering piece of a vehicle body, wherein a layer-by-layer progressive self-adaptive point distribution mode can accurately and efficiently discover the risk area of the outer covering piece and perform rapid optimization design, meanwhile, the analysis efficiency is effectively improved by combining an automatic method, and the problems of poor accuracy and the like caused by the randomness of manual point selection or inherent thinking are avoided.

The technical scheme of the application is as follows in combination with the accompanying drawings:

in a first aspect, an embodiment of the present application provides a method for analyzing dent resistance of an exterior panel of a vehicle body, including the steps of:

step one, inputting an outer covering piece and a pressure head finite element model, and establishing constraint;

uniformly arranging loading points on the surface of the identified outer covering piece;

step three, automatically analyzing the concave resistance of each point;

judging whether risk points exist or not;

step five, if the risk points exist in the first-round loading points, newly adding encryption loading points around the risk points, and if the risk points do not exist in the first-round loading points, newly adding loading points at spare positions of the original loading points;

step six, automatically analyzing and judging the dent resistance of the newly added loading point;

and step seven, determining the position and the shape of the reinforced structure according to the position of the comprehensive risk point.

Further, the specific method of the first step is as follows:

creating a finite element model with the diameter of 80mm through shell units, wherein the triangle unit type is R3D3, the quadrilateral unit type is R3D4, and the model attribute is set as a rigid body; the constraint represents the constraint of the freedom degree in the directions of the joint 1-6 of the clamping position of the body-in-white clamp or the connecting position of the outer covering piece and the body-in-white.

Further, the specific method of the second step is as follows:

identifying an outer cover surface area, selecting surface units and establishing a set; the loading points are uniformly arranged in the outer surface area with a spacing of 160mm, and the vertical distance between the loading points and the boundary of the surface is required to be more than 40mm.

Further, the specific method of the third step is as follows:

and (3) establishing a normal vector by utilizing the loading point and the peripheral node information obtained in the step two, adjusting the surface of the pressure head to be vertical to the normal vector, adjusting the center point of the surface of the pressure head to be 1mm away from the loading point along the normal vector, creating the contact between the pressure head and the surface of the outer covering piece, loading the load of the anti-concavity simulation working condition, setting a solver, outputting displacement and stress, and submitting the calculation in batches.

Further, the specific method of the fourth step is as follows:

and reading whether the displacement-load curves corresponding to all the loading points have a destabilization interval and residual displacement at the loading points, and judging whether risk points exist.

Further, the specific method of the step seven is as follows:

if no risk point is prompted, the outer covering piece anti-dent property meets the requirement, and if the risk point is prompted, the position and the shape of the reinforcing structure are determined according to the position of the risk point, so that the outer covering piece anti-dent property is optimized.

In a second aspect, an embodiment of the present application further provides a device for analyzing dent resistance of an exterior panel of a vehicle body, including:

the input module is used for inputting the outer covering piece and the pressure head finite element model and establishing constraint;

an arrangement module for uniformly arranging loading points on the identified outer cover surface;

the first analysis module is used for automatically analyzing the dent resistance of each point;

the first judging module is used for judging whether risk points exist or not;

the second judging module is used for adding an encryption loading point around the risk point if the risk point exists in the first-round loading point, and adding a loading point at the spare position of the original loading point if the risk point does not exist in the first-round loading point;

the second analysis module is used for automatically analyzing and judging the dent resistance of the newly added loading point;

and the determining module is used for determining the position and the shape of the reinforcing structure according to the comprehensive risk point positions.

In a third aspect, a terminal is provided, including:

one or more processors;

a memory for storing the one or more processor-executable instructions;

wherein the one or more processors are configured to:

the method according to the first aspect of the embodiment of the application is performed.

In a fourth aspect, a non-transitory computer readable storage medium is provided, which when executed by a processor of a terminal, enables the terminal to perform the method according to the first aspect of the embodiments of the application.

In a fifth aspect, an application product is provided, which when running at a terminal causes the terminal to perform the method according to the first aspect of the embodiments of the application.

The beneficial effects of the application are as follows:

1) The self-adaptive point distribution mode progressive layer by layer can accurately and efficiently find the risk area of the outer covering part and carry out rapid optimization design, thereby avoiding the problems of poor accuracy and the like caused by the randomness of manual point selection or inherent thinking, and simultaneously effectively improving the analysis efficiency by combining an automatic method

2) The application obtains the risk area, directly gives the position and the shape of the reinforced structure, and avoids the economic loss possibly caused by insufficient concavity resistance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart of a method for analyzing a pre-deformation of a passenger car tailgate according to the application;

FIG. 2a is a schematic perspective view of a ram;

FIG. 2b is a schematic diagram of the front view of the ram;

FIG. 3 is a schematic diagram of a risk point and its surrounding encrypted load points;

FIG. 4 is a schematic diagram of an original load point and a newly added load point;

FIG. 5 is a schematic illustration of body-in-white restraint positions;

FIG. 6 is a schematic diagram of a loading point location;

FIG. 7 is a schematic diagram of a risk point displacement-load curve;

FIG. 8 is a schematic diagram of risk points and newly added loading points;

FIG. 9 is a schematic view of a reinforcement structure;

FIG. 10 is a schematic structural view of an analysis device for pre-deformation of a back door of a passenger car according to the present application;

fig. 11 is a schematic block diagram of a terminal structure.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.

Example 1

Fig. 1 is a flowchart of a method for analyzing dent resistance of an outer panel of a vehicle body according to an embodiment of the present application, where the method may be performed by an apparatus for analyzing dent resistance of an outer panel of a vehicle body according to an embodiment of the present application, and the apparatus may be implemented in software and/or hardware.

In this embodiment, taking a certain vehicle model as an example, the dent resistance of the outer cover of the vehicle body is analyzed, and the method includes the following steps:

step one, referring to fig. 2a and 2b, inputting an outer cover and a pressure head finite element model, and establishing constraints, wherein the specific method is as follows:

inputting a white car body of a certain car type and loading a pressure head finite element model, wherein the diameter of the pressure head finite element model is 80mm, the pressure head finite element model is formed by building triangle and quadrilateral shell units, the triangle unit type is R3D3, the quadrilateral unit type is R3D4, and the model attribute is a rigid body. And selecting a fixed area at the clamping position of the side wall outer plate clamp of the white automobile body, namely the outer edges of the middle positions of the left front threshold, the left rear threshold, the right front threshold and the right rear threshold, and restraining the degrees of freedom of the nodes in the directions of 1-6, wherein the restraining positions are shown in figure 5.

Step two, uniformly arranging loading points on the surface of the identified outer covering piece, wherein the specific method comprises the following steps of:

and selecting a side wall surface area unit and establishing a set through a Hypermesh software by face function, uniformly arranging loading points with the distance of about 160mm on the outer surface area by using a secondary development language, and enabling the vertical distance between the loading points and the surface boundary to be larger than 40mm, as shown in fig. 6.

Step three, automatically analyzing the dent resistance of each point, wherein the specific method is as follows:

and establishing a normal vector by using the hypersash preprocessing software secondary development interface, adjusting the surface of the pressure head to be vertical to the normal vector by using the loading point and the peripheral node information thereof, adjusting the center point of the surface of the pressure head to be 1mm away from the loading point along the normal vector, creating the contact of the pressure head and the surface of the outer covering, applying loading load and unloading load, setting parameters such as a solver, geometric nonlinearity, time step and the like, setting and outputting the displacement, stress and strain results of the side wall outer plates, and submitting the results to calculation in batches.

Judging whether risk points exist or not, wherein the specific method comprises the following steps:

and (3) reading displacement-load curves corresponding to all loading points by using a Hyperview post-processing software secondary development interface, judging whether a destabilization zone exists or not and judging whether residual displacement corresponding to the unloading curve when the load is 0 is larger than a specified limit value by identifying the slope change of the displacement-load curves at the loading points, and judging a risk point, wherein the displacement-load curves are shown in fig. 7, the destabilization zone does not exist, and the residual displacement is 0.62mm and larger than the specified limit value.

Step five, if the risk points exist in the first-round loading points, newly adding the dense loading points in the background grid where the risk points are located, as shown in fig. 3; if no risk point exists in the first-round loading points, loading points are newly added at the spare positions of all original loading points, namely the central positions of all background grids, as shown in fig. 4.

In this embodiment, encryption loading points are newly added around the risk point. The background grid where the risk points are located is identified by using the secondary development language, and the encryption loading points are newly added at the center of the background grid, as shown in fig. 8.

And step six, referring to the step three and the step four, automatically analyzing and judging the dent resistance of the newly added loading point.

And step seven, determining the position and the shape of the reinforced structure by combining the positions of the risk points. And combining the analysis results of the two rounds, prompting two risk points altogether, and determining the position and the shape of the reinforcing structure according to the positions of the risk points, wherein the position and the shape of the reinforcing structure are shown in figure 9. After the reinforcing structure is added, the displacement-load curves of the two risk points have no instability interval, and the residual displacement is smaller than the limit value, so that the requirement of concavity resistance is met.

In summary, the risk area is obtained by the method provided by the application, and the position and the shape of the reinforcing structure are directly provided, so that the economic loss possibly caused by insufficient concavity resistance is avoided.

Example two

Referring to fig. 10, a vehicle body outer cover dent resistance analysis apparatus includes:

the first judging module is used for judging whether risk points exist or not;

Example III

Fig. 11 is a block diagram of a terminal according to an embodiment of the present application, and the terminal may be a terminal according to the above embodiment. The terminal may be a portable mobile terminal such as: smart phone, tablet computer. Terminals may also be referred to by other names, user equipment, portable terminals, etc.

Generally, the terminal includes: a processor 301 and a memory 302.

Processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. The processor 301 may be implemented in at least one hardware form of DSP (Digital Signal Processing ), FPGA (Field-Programmable Gate Array, field programmable gate array), PLA (Programmable Logic Array ). The processor 301 may also include a main processor, which is a processor for processing data in an awake state, also called a CPU (Central Processing Unit ), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 301 may integrate a GPU (Graphics Processing Unit, image processor) for rendering and drawing of content required to be displayed by the display screen. In some embodiments, the processor 301 may also include an AI (Artificial Intelligence ) processor for processing computing operations related to machine learning.

Memory 302 may include one or more computer-readable storage media, which may be tangible and non-transitory. Memory 302 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 302 is used to store at least one instruction for execution by processor 301 to implement a method of vehicle body outer panel dent resistance analysis provided in the present application.

In some embodiments, the terminal may further optionally include: a peripheral interface 303, and at least one peripheral. Specifically, the peripheral device includes: at least one of radio frequency circuitry 304, touch screen 305, camera 306, audio circuitry 307, positioning component 308, and power supply 309.

The peripheral interface 303 may be used to connect at least one Input/Output (I/O) related peripheral to the processor 301 and the memory 302. In some embodiments, processor 301, memory 302, and peripheral interface 303 are integrated on the same chip or circuit board; in some other embodiments, either or both of the processor 301, the memory 302, and the peripheral interface 303 may be implemented on separate chips or circuit boards, which is not limited in this embodiment.

The Radio Frequency circuit 304 is configured to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuitry 304 communicates with a communication network and other communication devices via electromagnetic signals. The radio frequency circuit 304 converts an electrical signal into an electromagnetic signal for transmission, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 304 includes: antenna systems, RF transceivers, one or more amplifiers, tuners, oscillators, digital signal processors, codec chipsets, subscriber identity module cards, and so forth. The radio frequency circuitry 304 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocol includes, but is not limited to: the world wide web, metropolitan area networks, intranets, generation mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and/or WiFi (Wireless Fidelity ) networks. In some embodiments, the radio frequency circuitry 304 may also include NFC (Near Field Communication ) related circuitry, which is not limiting of the application.

The touch display screen 305 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. The touch screen 305 also has the ability to collect touch signals at or above the surface of the touch screen 305. The touch signal may be input as a control signal to the processor 301 for processing. The touch screen 305 is used to provide virtual buttons and/or virtual keyboards, also known as soft buttons and/or soft keyboards. In some embodiments, the touch display 305 may be one, providing a front panel of the terminal; in other embodiments, the touch display screen 305 may be at least two, respectively disposed on different surfaces of the terminal or in a folded design; in still other embodiments, the touch display 305 may be a flexible display disposed on a curved surface or a folded surface of the terminal. Even more, the touch display screen 305 may be arranged in an irregular pattern that is not rectangular, i.e., a shaped screen. The touch display 305 may be made of LCD (Liquid Crystal Display ), OLED (Organic Light-Emitting Diode) or other materials.

The camera assembly 306 is used to capture images or video. Optionally, the camera assembly 306 includes a front camera and a rear camera. In general, a front camera is used for realizing video call or self-photographing, and a rear camera is used for realizing photographing of pictures or videos. In some embodiments, the number of the rear cameras is at least two, and the rear cameras are any one of a main camera, a depth camera and a wide-angle camera, so as to realize fusion of the main camera and the depth camera to realize a background blurring function, and fusion of the main camera and the wide-angle camera to realize a panoramic shooting function and a Virtual Reality (VR) shooting function. In some embodiments, camera assembly 306 may also include a flash. The flash lamp can be a single-color temperature flash lamp or a double-color temperature flash lamp. The dual-color temperature flash lamp refers to a combination of a warm light flash lamp and a cold light flash lamp, and can be used for light compensation under different color temperatures.

The audio circuit 307 is used to provide an audio interface between the user and the terminal. The audio circuit 307 may include a microphone and a speaker. The microphone is used for collecting sound waves of users and environments, converting the sound waves into electric signals, and inputting the electric signals to the processor 301 for processing, or inputting the electric signals to the radio frequency circuit 304 for voice communication. For the purpose of stereo acquisition or noise reduction, a plurality of microphones can be respectively arranged at different parts of the terminal. The microphone may also be an array microphone or an omni-directional pickup microphone. The speaker is used to convert electrical signals from the processor 301 or the radio frequency circuit 304 into sound waves. The speaker may be a conventional thin film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, not only the electric signal can be converted into a sound wave audible to humans, but also the electric signal can be converted into a sound wave inaudible to humans for ranging and other purposes. In some embodiments, the audio circuit 307 may also include a headphone jack.

The location component 308 is used to locate the current geographic location of the terminal to enable navigation or LBS (Location Based Service, location-based services). The positioning component 308 may be a positioning component based on the United states GPS (Global Positioning System ), the Beidou system of China, or the Galileo system of Russia.

The power supply 309 is used to power the various components in the terminal. The power source 309 may be alternating current, direct current, disposable or rechargeable. When the power source 309 comprises a rechargeable battery, the rechargeable battery may be a wired rechargeable battery or a wireless rechargeable battery. The wired rechargeable battery is a battery charged through a wired line, and the wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery may also be used to support fast charge technology.

Those skilled in the art will appreciate that the structure shown in fig. 11 is not limiting of the terminal and may include more or fewer components than shown, or may combine certain components, or may employ a different arrangement of components.

Example IV

In an exemplary embodiment, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of analyzing dent resistance of a vehicle body outer panel as provided by all the inventive embodiments of the present application.

Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).

Example five

In an exemplary embodiment, an application program product is also provided that includes one or more instructions that are executable by the processor 301 of the above apparatus to perform the above method of analyzing the dent resistance of a vehicle body outer panel.

Although embodiments of the present application have been disclosed above, they are not limited to the use listed in the description and modes of implementation. It can be applied to various fields suitable for the present application. Additional modifications will readily occur to those skilled in the art. Therefore, the application is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims

1. A method for analyzing dent resistance of an exterior panel of a vehicle body, comprising the steps of:

step three, automatically analyzing the concave resistance of each point;

judging whether risk points exist or not;

2. The method for analyzing the dent resistance of a vehicle body outer panel according to claim 1, wherein the specific method of the first step is as follows:

3. The method for analyzing the dent resistance of the outer panel according to claim 1, wherein the specific method of the second step is as follows:

4. A method for analyzing dent resistance of a vehicle body outer panel according to claim 3, wherein the specific method of the third step is as follows:

5. The method for analyzing the dent resistance of the outer panel according to claim 1, wherein the specific method of the fourth step is as follows:

6. The method for analyzing the dent resistance of the outer panel according to claim 1, wherein the specific method of the step seven is as follows:

7. A vehicle body outer panel dent resistance analysis apparatus characterized by comprising:

the first judging module is used for judging whether risk points exist or not;

8. A terminal, comprising:

one or more processors;

a memory for storing the one or more processor-executable instructions;

wherein the one or more processors are configured to:

a method of analyzing dent resistance of a vehicle body outer panel according to any one of claims 1 to 6 is performed.

9. A non-transitory computer readable storage medium, characterized in that instructions in the storage medium, when executed by a processor of a terminal, enable the terminal to perform a method of analysis of dent resistance of a vehicle body outer cover according to any one of claims 1 to 6.