Method and device for improving simulation accuracy of a knuckle of a macpherson front suspension under braking conditions

Abstract

This invention relates to a method and apparatus for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle. It includes: 1. Importing a geometric model for geometric cleanup and mesh generation; 2. Establishing the fit relationships of the MacPherson strut front suspension steering knuckle assembly; 3. Defining the material properties of the MacPherson strut front suspension steering knuckle assembly and defining the boundary conditions for finite element analysis; 4. Applying decomposed loads under braking conditions; 5. Performing finite element analysis. If the steering knuckle deformation is determined to be correct, post-processing of the results ends the analysis; if the steering knuckle deformation is determined to be incorrect, the cause is investigated until the result is correct. This invention fully considers the force characteristics and constraint features of the steering knuckle during braking, and also considers the influence of the brake caliper's stiffness on the steering knuckle analysis results. It better matches the constraint and force characteristics of the steering knuckle during actual braking, making the analysis results more accurate, greatly improving steering knuckle development efficiency, and shortening the steering knuckle development cycle.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology, specifically a method and apparatus for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle. Background Technology

[0002] Current analytical methods for analyzing the braking conditions of MacPherson strut front suspension steering knuckles do not define appropriate boundary conditions based on the characteristics of the steering knuckle forces during braking. Furthermore, the analysis does not adequately consider the impact of the caliper's own stiffness on the results. In fact, analyzing the force characteristics of the steering knuckle during braking reveals that the caliper's own stiffness has a significant impact on the steering knuckle strength. The characteristics of steering knuckle braking are that the caliper presses against the brake disc, restricting the free rotation of the brake disc through friction. The brake caliper is connected to the steering knuckle via lugs. Due to the presence of friction, the degree of freedom of the steering knuckle's rotation around the bearing mounting center hole axis is constrained by friction. Summary of the Invention

[0003] This invention provides a method and apparatus for improving the simulation accuracy of MacPherson strut front suspension steering knuckle braking conditions. It fully considers the force characteristics and constraint features of the steering knuckle during braking, while also taking into account the influence of the brake caliper's stiffness on the steering knuckle analysis results. This approach better matches the constraint and force characteristics of the steering knuckle during actual braking, resulting in more accurate analysis results. It is particularly significant for the strength analysis of the caliper connecting lug position, greatly contributing to improving the strength and durability of the steering knuckle under braking conditions. This significantly improves steering knuckle development efficiency, shortens the development cycle, and solves the aforementioned problems existing in current MacPherson strut front suspension steering knuckle braking condition analysis methods.

[0004] The technical solution of this invention is described below in conjunction with the accompanying drawings:

[0005] In a first aspect, embodiments of the present invention provide a method for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle, comprising:

[0006] Step 1: Import the geometric model of the MacPherson strut front suspension steering knuckle assembly and perform geometry cleanup and mesh generation;

[0007] Step 2: Establish the fit relationship of the MacPherson strut front suspension steering knuckle assembly;

[0008] Step 3: Define the material properties of the MacPherson strut front suspension steering knuckle assembly and define the boundary conditions for the finite element analysis.

[0009] Step 4: Apply braking conditions to decompose the load;

[0010] Step 5: Perform finite element analysis and read the finite element analysis results. If the steering knuckle deformation is determined to be correct, perform post-processing analysis to end the analysis. If the steering knuckle deformation is determined to be incorrect, return to steps 2-4 to find the cause until the result is correct.

[0011] Furthermore, in step one,

[0012] The steering knuckle in the MacPherson strut front suspension steering knuckle assembly is divided into a second-order tetrahedron; the brake caliper and bearing mounting base in the MacPherson strut front suspension steering knuckle assembly are divided into a first-order tetrahedron.

[0013] Furthermore, in step two,

[0014] A binding constraint relationship is established between the surface of the steering knuckle and the brake caliper that are in direct contact.

[0015] The steering knuckle and the non-contact plane of the brake caliper are connected by a rigid unit;

[0016] A binding constraint relationship is established between the contact surfaces of the steering knuckle and the bearing mounting seat;

[0017] The location where the steering knuckle and bearing mounting seat are connected by bolts is simulated using rigid elements.

[0018] Establish a local coordinate system.

[0019] Furthermore, there are two methods for establishing the local coordinate system, as detailed below:

[0020] The first type: The local coordinate system is a Cartesian coordinate system. The specific definition method is to take the braking point as the origin of the coordinate system, and the direction of the line connecting the braking point, the braking surface and the axis of the bearing mounting center hole is the X direction; the direction passing through the braking point and parallel to the axis of the bearing mounting center hole is the Z direction; the Y direction conforms to the right-hand rule, and the Y direction determined in this way is the tangent direction passing through the braking point.

[0021] The second type: The local coordinate system is a cylindrical coordinate system. The specific definition method is to take the intersection of the braking surface and the axis of the bearing mounting seat center hole as the origin of the cylindrical coordinate system, the direction of the line connecting the intersection of the braking surface and the axis and the braking point is the R direction of the cylindrical coordinate system, the direction of the axis of the bearing mounting seat center hole is the Z direction of the cylindrical coordinate system, and the T direction determined by this is the tangent direction of the braking point.

[0022] Furthermore, in step three,

[0023] Assign appropriate material properties to the steering knuckle, caliper, and bearing mounting bracket;

[0024] When defining the boundary conditions for finite element analysis, the braking point is defined in a local coordinate system. The degree of freedom along the tangent direction is constrained at the braking point, and the degree of freedom in all directions except the rotational direction around the axis of the bearing mounting center is constrained at the wheel center point. The degree of freedom in the rotational direction around the axis of the bearing mounting center is also constrained at the braking point.

[0025] Furthermore, in step four,

[0026] Apply braking loads to each hard point connecting the steering knuckle and control arm.

[0027] Furthermore, in step five,

[0028] Determine whether the deformation of the steering knuckle is consistent with the boundary conditions applied to the steering knuckle. If they are inconsistent, return to steps two through four to find the cause until the deformation of the steering knuckle is consistent with the applied calculation and analysis boundary conditions.

[0029] Secondly, embodiments of the present invention also provide a device for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle, comprising:

[0030] The mesh generation module is used to import the geometric model of the MacPherson strut front suspension steering knuckle assembly for geometry cleanup and mesh generation;

[0031] Establish a module to establish the mating relationships of the MacPherson strut front suspension steering knuckle assembly;

[0032] The definition module is used to define the material properties of the MacPherson strut front suspension steering knuckle assembly and to define the analytical boundary conditions for finite element calculations.

[0033] The load application module is used to apply the decomposed load under braking conditions;

[0034] The analysis module is used to perform finite element analysis, read the finite element analysis results, and if the steering knuckle deformation is determined to be correct, the post-processing of the results ends the analysis. If the steering knuckle deformation is determined to be incorrect, the cause is investigated until the result is correct.

[0035] Thirdly, a terminal is provided, including:

[0036] One or more processors;

[0037] Memory for storing the one or more processor-executable instructions;

[0038] Wherein, the one or more processors are configured as follows:

[0039] Perform the method described in the first aspect of the embodiments of the present invention.

[0040] Fourthly, a non-transitory computer-readable storage medium is provided, wherein when instructions in the storage medium are executed by a processor of a terminal, the terminal is enabled to perform the method described in the first aspect of the present invention.

[0041] Fifthly, an application product is provided, which, when running on a terminal, causes the terminal to execute the method described in the first aspect of the present invention.

[0042] The beneficial effects of this invention are as follows:

[0043] 1) This invention fully considers the force and constraint characteristics of the steering knuckle during braking. Furthermore, the calculations take into account the influence of the brake caliper's stiffness on the steering knuckle analysis results, making the results more consistent with the actual constraint and force characteristics of the steering knuckle during braking, and thus more accurate.

[0044] 2) This invention is of great significance for the strength analysis of the caliper connecting lug position, which is of great help to improve the strength and durability of the steering knuckle under braking conditions, greatly improves the development efficiency of the steering knuckle, and shortens the development cycle of the steering knuckle. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the steering knuckle braking condition analysis model;

[0047] Figure 2 This is a flowchart of a method for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle, as described in this invention.

[0048] Figure 3 This is a schematic diagram showing the relationship between the steering knuckle and the caliper.

[0049] Figure 4 for Figure 3 Sectional view at point AA;

[0050] Figure 5 Schematic diagram of the mating relationship between the steering knuckle and the bearing mounting base Figure 1 ;

[0051] Figure 6 Schematic diagram of the mating relationship between the steering knuckle and the bearing mounting base Figure 2 ;

[0052] Figure 7A schematic diagram defining a local Cartesian coordinate system;

[0053] Figure 8 A schematic diagram defining a local cylindrical coordinate system;

[0054] Figure 9 This is a schematic diagram of a device for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle, as described in this invention.

[0055] Figure 10 This is a schematic block diagram of a terminal structure.

[0056] In the picture:

[0057] 1. Brake caliper; 2. Steering knuckle; 3. Bearing mount; 4. Non-contact surfaces of steering knuckle and caliper; 5. Contact surfaces of steering knuckle and caliper; 6. Contact surfaces between steering knuckle and bearing mount; 7. Position of nut mating with steering knuckle; 8. Position of bolt head mating with steering knuckle; 9. Braking point; 10. Axis of the center hole of bearing mount; 11. Intersection of the braking surface and the axis of the center hole of bearing mount. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0060] Example 1

[0061] Figure 2 This is a flowchart of a method for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle, provided in Embodiment 1 of the present invention. This embodiment is applicable to improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle. The method can be executed by a device for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle, as provided in this embodiment of the present invention. This device can be implemented in software and / or hardware.

[0062] Before conducting the analysis, it is necessary to check whether the assembly relationship and position of the geometric model are correct. The requirements for the assembly of the geometric model are that the relative positions of steering knuckle 2, brake caliper 1, and bearing mounting seat 3 are correct, and the model is located in the correct vehicle coordinate system. The assembled steering knuckle 2, brake caliper 1, and bearing mounting seat 3 are as follows: Figure 1 As shown.

[0063] See Figure 2 A method for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle includes:

[0064] Step 1: Import the geometric model of the MacPherson strut front suspension steering knuckle assembly and perform geometry cleanup and mesh generation;

[0065] The steering knuckle 1 in the MacPherson strut front suspension steering knuckle assembly is divided into a second-order tetrahedron; the brake caliper 1 and bearing mounting seat 3 in the MacPherson strut front suspension steering knuckle assembly are divided into first-order tetrahedrons.

[0066] See Figures 3-6 Step 2: Establish the fit relationship of the MacPherson strut front suspension steering knuckle assembly;

[0067] The steering knuckle and caliper contact surfaces 5 are bound together.

[0068] The steering knuckle and caliper non-contact surface 4 are connected by a rigid unit;

[0069] A binding constraint relationship is established between the contact surface 6 of the steering knuckle and the bearing mounting seat;

[0070] The positions of the bolt head and nut mating with the steering knuckle are simulated using rigid elements to establish a local coordinate system for the bolt connection. Figure 5 7 indicates the position where the nut mates with the steering knuckle; 8 indicates the position where the bolt head mates with the steering knuckle.

[0071] There are two methods for establishing a local coordinate system, as follows:

[0072] The first type: The local coordinate system is a Cartesian coordinate system. Specifically, the braking point is taken as the origin of the coordinate system. The direction of the line connecting the braking point 9, the braking surface, and the axis 10 of the bearing mounting center hole is the X-axis; the direction passing through the braking point 9 and parallel to the axis 10 of the bearing mounting center hole is the Z-axis; the Y-axis conforms to the right-hand rule, such as... Figure 7 As shown, the Y-direction determined in this way is the tangent direction passing through the braking point;

[0073] The second type: The local coordinate system is a cylindrical coordinate system. Specifically, the origin of the cylindrical coordinate system is defined as the intersection point 11 of the braking surface and the axis of the bearing mounting center hole. The direction of the line connecting the intersection point 11 and the braking point 9 is the R-axis of the cylindrical coordinate system, and the direction of the axis 10 of the bearing mounting center hole is the Z-axis. The T-axis determined in this way is the tangent direction of the braking point 9. Figure 8 The diagram shown illustrates the definition of a local cylindrical coordinate system.

[0074] When constraining the tangential direction of the braking point 9, two conditions need to be defined: 1. The location of the braking point 9; 2. The tangential direction of the rotation of the braking point 9 around the axis 10 of the bearing mounting center hole. First, the location of the braking point 9 is determined in the finite element model. The method for determining the location of the braking point 9 is as follows: the braking point 9 lies in a plane perpendicular to the axis 10 of the steering knuckle bearing mounting center hole. This plane, containing the braking point 9 and perpendicular to the axis 10 of the bearing mounting center hole, is defined as the braking surface. The braking surface passes through the center between the two contact surfaces of the brake caliper 1. The location of the braking point 9 is on the line connecting the center between the two contact surfaces of the brake caliper 1 and the intersection of the braking surface and the axis of the bearing mounting center hole, and the distance from the intersection of the braking surface and the axis of the bearing mounting center hole is the effective braking radius of the brake caliper 1. This point, determined by the above method, is the braking point 9.

[0075] Step 3: Define the material properties of the MacPherson strut front suspension steering knuckle assembly and define the boundary conditions for the finite element analysis.

[0076] Assign appropriate material properties to the steering knuckle, caliper, and bearing mounting bracket;

[0077] When defining the boundary conditions for finite element analysis, after defining either of the two local coordinate systems, define the braking point 9 in the local coordinate system. Constrain the degree of freedom along the tangent direction at the braking point 9, and constrain the degree of freedom in all directions except the rotational direction around the axis 10 of the bearing mounting center point. Constrain the degree of freedom in the rotational direction of the braking point 9 around the axis 10 of the bearing mounting center hole.

[0078] Step 4: Apply braking conditions to decompose the load;

[0079] Apply braking load decomposition to each hard point connecting the steering knuckle 2 and the control arm.

[0080] Step 5: Perform finite element analysis, read the finite element analysis results, and determine whether the deformation of the steering knuckle is consistent with the boundary conditions applied to the steering knuckle. If they are inconsistent, return to Steps 2-4 to find the cause until the deformation of the steering knuckle is consistent with the applied calculation and analysis boundary conditions.

[0081] Example 2

[0082] See Figure 9 A device for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle, comprising:

[0083] The mesh generation module is used to import the geometric model of the MacPherson strut front suspension steering knuckle assembly for geometry cleanup and mesh generation;

[0084] Establish a module to establish the mating relationships of the MacPherson strut front suspension steering knuckle assembly;

[0085] The definition module is used to define the material properties of the MacPherson strut front suspension steering knuckle assembly and to define the analytical boundary conditions for finite element calculations.

[0086] The load application module is used to apply the decomposed load under braking conditions;

[0087] The analysis module is used to perform finite element analysis, read the finite element analysis results, and if the steering knuckle deformation is determined to be correct, the post-processing of the results ends the analysis. If the steering knuckle deformation is determined to be incorrect, the cause is investigated until the result is correct.

[0088] Example 3

[0089] Figure 10 This is a structural block diagram of a terminal provided in an embodiment of this application. The terminal can be the terminal in the above embodiments. The terminal can be a portable mobile terminal, such as a smartphone or tablet computer. The terminal may also be referred to as user equipment, portable terminal, or other names.

[0090] Typically, a terminal includes a processor 301 and a memory 302.

[0091] Processor 301 may include one or more processing cores, such as a quad-core processor or an octa-core processor. Processor 301 may be implemented using at least one hardware form selected from DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). Processor 301 may also include a main processor and a coprocessor. The main processor, also known as a CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, processor 301 may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, processor 301 may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to machine learning.

[0092] 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 and non-volatile memory, such as one or more disk storage devices or flash memory devices. In some embodiments, the non-transitory computer-readable storage media in memory 302 is used to store at least one instruction, which is executed by processor 301 to implement a method for improving the accuracy of MacPherson strut steering knuckle braking condition simulation provided in this application.

[0093] In some embodiments, the terminal may also optionally include: a peripheral device interface 303 and at least one peripheral device. Specifically, the peripheral device includes at least one of: a radio frequency circuit 304, a touch display screen 305, a camera 306, an audio circuit 307, a positioning component 308, and a power supply 309.

[0094] The peripheral device interface 303 can be used to connect at least one I / O (Input / Output) related peripheral device to the processor 301 and the memory 302. In some embodiments, the processor 301, memory 302, and peripheral device interface 303 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 301, memory 302, and peripheral device interface 303 can be implemented on separate chips or circuit boards, which is not limited in this embodiment.

[0095] The radio frequency (RF) circuit 304 is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The RF circuit 304 communicates with communication networks and other communication devices via electromagnetic signals. The RF circuit 304 converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals back into electrical signals. Optionally, the RF circuit 304 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, etc. The RF circuit 304 can communicate with other terminals through at least one wireless communication protocol. This wireless communication protocol includes, but is not limited to: the World Wide Web, metropolitan area networks, intranets, various generations of mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and / or WiFi (Wireless Fidelity) networks. In some embodiments, the RF circuit 304 may also include circuitry related to NFC (Near Field Communication), which is not limited in this application.

[0096] The touch display screen 305 is used to display a UI (User Interface). This UI may include graphics, text, icons, videos, and any combination thereof. The touch display screen 305 also has the ability to collect touch signals on or above its surface. These touch signals can be input as control signals to the processor 301 for processing. The touch display screen 305 is used to provide virtual buttons and / or a virtual keyboard, also known as soft buttons and / or a soft keyboard. In some embodiments, there may be one touch display screen 305, which serves as the front panel of the terminal; in other embodiments, there may be at least two touch display screens, respectively disposed on different surfaces of the terminal or in a folded design; in still other embodiments, the touch display screen 305 may be a flexible display screen, disposed on a curved or folded surface of the terminal. Furthermore, the touch display screen 305 may be configured as a non-rectangular, irregular shape, i.e., a non-rectangular screen. The touch display screen 305 may be made of materials such as LCD (Liquid Crystal Display) or OLED (Organic Light-Emitting Diode).

[0097] Camera assembly 306 is used to acquire images or videos. Optionally, camera assembly 306 includes a front-facing camera and a rear-facing camera. Typically, the front-facing camera is used for video calls or selfies, and the rear-facing camera is used for taking photos or videos. In some embodiments, there are at least two rear-facing cameras, which are any one of a main camera, a depth-sensing camera, and a wide-angle camera, to achieve background blurring by fusion of the main camera and the depth-sensing camera, and panoramic shooting and VR (Virtual Reality) shooting by fusion of the main camera and the wide-angle camera. In some embodiments, camera assembly 306 may also include a flash. The flash can be a single-color temperature flash or a dual-color temperature flash. A dual-color temperature flash is a combination of a warm light flash and a cool light flash, which can be used for light compensation at different color temperatures.

[0098] Audio circuit 307 provides an audio interface between the user and the terminal. Audio circuit 307 may include a microphone and a speaker. The microphone is used to collect sound waves from the user and the environment, converting the sound waves into electrical signals that are input to processor 301 for processing, or input to radio frequency circuit 304 for voice communication. For stereo sound acquisition or noise reduction purposes, multiple microphones may be used, each located in a different part of the terminal. The microphone may also be an array microphone or an omnidirectional microphone. The speaker is used to convert electrical signals from processor 301 or radio frequency circuit 304 into sound waves. The speaker may be a conventional diaphragm speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can convert electrical signals not only into audible sound waves but also into inaudible sound waves for purposes such as distance measurement. In some embodiments, audio circuit 307 may also include a headphone jack.

[0099] The positioning component 308 is used to determine the current geographic location of the terminal in order to enable navigation or LBS (Location Based Service). The positioning component 308 can be a positioning component based on the US GPS (Global Positioning System), China's BeiDou system, or Russia's Galileo system.

[0100] Power supply 309 is used to power the various components in the terminal. Power supply 309 can be AC ​​power, DC power, a disposable battery, or a rechargeable battery. When power supply 309 includes a rechargeable battery, the rechargeable battery can be a wired rechargeable battery or a wireless rechargeable battery. A wired rechargeable battery is a battery that is charged via a wired line, while a wireless rechargeable battery is a battery that is charged via a wireless coil. The rechargeable battery can also be used to support fast charging technology.

[0101] Those skilled in the art will understand that Figure 10The structure shown does not constitute a limitation on the terminal and may include more or fewer components than shown, or combine certain components, or use different component arrangements.

[0102] Example 4

[0103] In an exemplary embodiment, a computer-readable storage medium is also provided, having stored thereon a computer program that, when executed by a processor, implements a method for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle as provided in all embodiments of the invention.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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).

[0108] Example 5

[0109] In an exemplary embodiment, an application product is also provided, including one or more instructions that can be executed by the processor 301 of the aforementioned device to perform the aforementioned method for improving the simulation accuracy of the braking condition of a MacPherson strut front suspension steering knuckle.

[0110] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the invention. Further modifications can be readily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for improving the simulation accuracy of a McPherson front suspension knuckle in a braking condition, characterized in that, Includes the following steps: Step 1: Import the geometric model of the MacPherson strut front suspension steering knuckle assembly and perform geometric cleanup and mesh generation; the steering knuckle in the MacPherson strut front suspension steering knuckle assembly is divided into second-order tetrahedrons; the brake caliper and bearing mounting base in the MacPherson strut front suspension steering knuckle assembly are divided into first-order tetrahedrons. Step 2: Establish the fit relationship of the MacPherson strut front suspension steering knuckle assembly; wherein, a binding constraint relationship is established between the surfaces of the steering knuckle and the brake caliper in direct contact; the non-contact planes of the steering knuckle and the brake caliper are connected using rigid elements; a binding constraint relationship is established between the contact surfaces of the steering knuckle and the bearing mounting seat; the position of the bolt connection between the steering knuckle and the bearing mounting seat is simulated using rigid elements; establish a local coordinate system; there are two methods for establishing the local coordinate system, as follows: The first type: The local coordinate system is a Cartesian coordinate system. The specific definition method is to take the braking point as the origin of the coordinate system, and the direction of the line connecting the braking point, the braking surface and the axis of the bearing mounting center hole is the X direction; the direction passing through the braking point and parallel to the axis of the bearing mounting center hole is the Z direction; the Y direction conforms to the right-hand rule, and the Y direction determined in this way is the tangent direction passing through the braking point. The second type: The local coordinate system is a cylindrical coordinate system. The specific definition method is to take the intersection of the braking surface and the axis of the bearing mounting center hole as the origin of the cylindrical coordinate system, the direction of the line connecting the intersection of the braking surface and the axis and the braking point is the R direction of the cylindrical coordinate system, the direction of the axis of the bearing mounting center hole is the Z direction of the cylindrical coordinate system, and the T direction determined by this is the tangent direction of the braking point. Step 3: Define the material properties of the MacPherson strut front suspension steering knuckle assembly and define the boundary conditions for the finite element analysis. Step 4: Apply braking conditions to decompose the load; Step 5: Perform finite element analysis and read the finite element analysis results. If the steering knuckle deformation is determined to be correct, perform post-processing analysis to end the analysis. If the steering knuckle deformation is determined to be incorrect, return to steps 2-4 to find the cause until the result is correct.

2. The method for improving the simulation precision of the McPherson front suspension knuckle in the braking condition according to claim 1, characterized in that, Step three Assign appropriate material properties to the steering knuckle, caliper, and bearing mounting bracket; When defining the boundary conditions for finite element analysis, the braking point is defined in a local coordinate system. The degree of freedom along the tangent direction is constrained at the braking point, and the degree of freedom in all directions except the rotational direction around the axis of the bearing mounting center is constrained at the wheel center point. The degree of freedom in the rotational direction around the axis of the bearing mounting center is also constrained at the braking point.

3. The method for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle according to claim 1, characterized in that, Step four, Apply braking load decomposition to each hard point connecting the steering knuckle and control arm.

4. The method for improving the simulation accuracy of MacPherson strut front suspension steering knuckle braking conditions according to claim 1, characterized in that, Step five, Determine whether the deformation of the steering knuckle is consistent with the boundary conditions applied to the steering knuckle. If they are inconsistent, return to steps two through four to find the cause until the deformation of the steering knuckle is consistent with the applied calculation and analysis boundary conditions.

5. A device for improving the simulation accuracy of braking conditions of a MacPherson strut front suspension steering knuckle, characterized in that, include: The mesh generation module is used to import the geometric model of the MacPherson strut front suspension steering knuckle assembly for geometry cleanup and mesh generation; The steering knuckle in the MacPherson strut front suspension steering knuckle assembly is divided into a second-order tetrahedron; the brake caliper and bearing mounting seat in the MacPherson strut front suspension steering knuckle assembly are divided into a first-order tetrahedron. A module is established to define the fit relationships of the MacPherson strut front suspension steering knuckle assembly. Specifically, a binding constraint relationship is established between the surfaces of the steering knuckle and the brake caliper in direct contact; the non-contact planes of the steering knuckle and brake caliper are connected using rigid elements; a binding constraint relationship is established between the contact surfaces of the steering knuckle and the bearing mount; the position of the bolted connection between the steering knuckle and the bearing mount is simulated using rigid elements; a local coordinate system is established; there are two methods for establishing the local coordinate system, as detailed below: The first type: The local coordinate system is a Cartesian coordinate system. The specific definition method is to take the braking point as the origin of the coordinate system, and the direction of the line connecting the braking point, the braking surface and the axis of the bearing mounting center hole is the X direction; the direction passing through the braking point and parallel to the axis of the bearing mounting center hole is the Z direction; the Y direction conforms to the right-hand rule, and the Y direction determined in this way is the tangent direction passing through the braking point. The second type: The local coordinate system is a cylindrical coordinate system. The specific definition method is to take the intersection of the braking surface and the axis of the bearing mounting center hole as the origin of the cylindrical coordinate system, the direction of the line connecting the intersection of the braking surface and the axis and the braking point is the R direction of the cylindrical coordinate system, the direction of the axis of the bearing mounting center hole is the Z direction of the cylindrical coordinate system, and the T direction determined by this is the tangent direction of the braking point. The definition module is used to define the material properties of the MacPherson strut front suspension steering knuckle assembly and to define the boundary conditions for finite element analysis. The load application module is used to apply the decomposed load under braking conditions; The analysis module is used to perform finite element analysis, read the finite element analysis results, and if the steering knuckle deformation is determined to be correct, the post-processing of the results ends the analysis. If the steering knuckle deformation is determined to be incorrect, the cause is investigated until the result is correct.

6. A terminal, characterized in that, include: One or more processors; Memory for storing the one or more processor-executable instructions; Wherein, the one or more processors are configured as follows: Perform the method described in any one of claims 1 to 4 for improving the accuracy of MacPherson strut steering knuckle braking condition simulation.

7. A non-transitory computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the terminal's processor, the terminal is able to execute a method for improving the simulation accuracy of the braking condition of a MacPherson strut steering knuckle as described in any one of claims 1 to 4.

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