Load design method for simulation analysis of stone impact on automobile cover during automobile driving

Abstract

The present application belongs to the field of automobile technology, and in particular to a load design method for simulation analysis of stone impact on automobile covering parts during automobile driving. The method comprises: 1. determination of initial parameters of tire and stone throwing; 2. determination of stone throwing variables and construction of motion coordinates; 3. construction of stone throwing trajectory equation; 4. definition of stone impact working condition of automobile covering parts; 5. calculation of working load condition; 6. optimization of load condition. According to the load design method for simulation analysis of stone impact on automobile covering parts based on the position of the impacted automobile, variables such as driving parameters, and the like, the present application provides a basis for load and working condition determination for corresponding simulation analysis and evaluation of automobile covering parts during automobile development stage, and provides strong support for development of stone impact resistance of automobile covering parts, and solves the problem of difficulty in defining simulation verification of early product development due to randomness of the position, speed, direction, stone mass, and the like during actual driving use.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology, specifically a simulation analysis and load design method for automotive body panels during vehicle operation involving stone impact. Background Technology

[0002] During vehicle operation, it is inevitable that stones will hit the car's body panels. In most driving scenarios, these stones are ejected by the tires, traveling in a parabolic trajectory in any direction and impacting the vehicle's own body or other vehicles' exterior panels (such as the body, fenders, front and rear bumper panels, windshield, etc.) at high speed. Simultaneously, the vehicle being struck also experiences the impact of the flying stone at a certain speed, either head-on, in the opposite direction, or laterally.

[0003] During the automotive development phase, simulation analysis and evaluation of automotive body panels are crucial for assessing their resistance to stone impacts. When necessary, simulation results can be used to implement improvements, significantly enhancing product competitiveness. However, in real-world driving scenarios, the location, speed, direction, and mass of the impacting stone are highly random, making it difficult to define in early-stage product development simulations. Currently, there is no mature standard for defining stone impact loads on automotive body panels. Therefore, a theoretically grounded method for designing stone impact loads on automotive body panels is essential. Summary of the Invention

[0004] This invention provides a method for designing loads in a simulation analysis of stone impacts on automotive body panels during vehicle operation. This method considers the location of different body panels and driving parameters of the impacted vehicle to design loads for simulation analysis of stone impacts on automotive body panels. It provides a basis for determining loads and operating conditions during the automotive development phase, offering strong support for developing the stone impact resistance of automotive body panels. This addresses the problem that in actual driving scenarios, the impact location, speed, direction, and stone mass are relatively random, making it difficult to define in early-stage product development simulation verification, and currently lacking a mature standard for defining stone impact loads on automotive body panels.

[0005] The technical solution of this invention is described below in conjunction with the accompanying drawings:

[0006] In a first aspect, embodiments of the present invention provide a method for simulating load design of a vehicle body panel impacted by a stone during vehicle operation, comprising the following steps:

[0007] Step 1: Determine the initial parameters of the tire and the thrown stone. The initial parameters are the specific input data required in the process of obtaining the stone impact load.

[0008] Step 2: Determine the variables for the stone's trajectory and construct its motion coordinates;

[0009] Step 3: Construct the trajectory equation of the thrown stone in the motion coordinate system and perform numerical plotting;

[0010] Step 4: Based on the actual driving and usage scenarios of the vehicle after an impact, and combined with the specific location of the vehicle's outer body panels, define the impact conditions of the main outer body panels.

[0011] Step 5: Calculate the load conditions for the operating condition;

[0012] Step 6: Optimize load conditions.

[0013] Furthermore, in step one, the initial parameters include:

[0014] a1) Tire radius R, to determine the initial position height and ejection speed;

[0015] a2) Angle range of the ejection velocity α min ~α max ;

[0016] a3) Gravitational acceleration g;

[0017] a4) The speed at which the vehicle throws out stones, V output ;

[0018] a5) Vehicle impact speed V iutput ;

[0019] a6) Mass of the gravel, M;

[0020] a7) Stone impact velocity V0;

[0021] a8) The horizontal displacement X, vertical displacement Z and the coordinates of the impact point (x0, z0) of the stone thrown out;

[0022] a9) The angle θ between the impact direction and the surface of the CAS impact point, and the angle between the impact parabolic surface and the normal plane of the CAS surface at the impact point.

[0023] Furthermore, in step two, the variables related to the throwing of the stones include:

[0024] b1) The angle at which the stone is thrown is α;

[0025] b2) Mass of the stone, M;

[0026] b3) Vehicle speed V after throwing out stones output ;

[0027] b4) Horizontal displacement of the stone x0.

[0028] Furthermore, in step two, the specific method for constructing the motion coordinate system is as follows:

[0029] 21) Define the origin O; take the point where the vehicle's tires touch the ground as the origin O;

[0030] 22) Define the X-axis; define the horizontal direction of the launch direction as the X-axis direction;

[0031] 23) Define the Z-axis; define the vertical upward direction as the positive direction of the Z-axis.

[0032] Furthermore, the specific method for step three is as follows:

[0033] 31) Construct the wheel outer contour equation. The shape equation of the lower half of the tire outer contour is formula (1), and the shape equation of the upper half of the tire outer contour is formula (2).

[0034]

[0035]

[0036] In the formula, R is the tire radius;

[0037] 32) Construct the trajectory equation of the stone being thrown out. The trajectory equation of the stone being thrown out is formula (3);

[0038]

[0039] In the formula, V0 is the impact velocity of the stone; α is the angle at which the stone is thrown; and R is the tire radius.

[0040] 33) Construct the tire outer contour equation and numerical trajectory diagram;

[0041] 34) Construct a numerical trajectory graph of a specific combination of variables and parameters.

[0042] Furthermore, the specific method for step four is as follows:

[0043] 41) Delineate the impact zones of the vehicle's CAS (Compacts and Accessories) exterior body panels: The impact zones include the front, rear, side, and top areas;

[0044] 42) Impact Conditions in Four Regions: Based on the four regions defined in step 41), describe the impact conditions in each region. Use any cross-section of the vehicle's outer CAS (Carbon Casing) to illustrate the impact conditions at the four locations. The specific cross-section is determined according to actual requirements. The specific impact conditions are as follows:

[0045] During a frontal impact, three impact angles and velocities are randomly assigned.

[0046] In a lateral impact, two positions are randomly assigned with different impact angles and velocities.

[0047] During a rear-end collision, three impact angles and velocities are randomly assigned.

[0048] Upon impact from the top, two points are randomly assigned with different impact angles and velocities.

[0049] 43) Based on the operating conditions defined in step 42), the load step operating conditions are simplified as follows:

[0050] 431) The CAS impact location corresponds to the connection point between the assembly and the environmental components or the location of a partial cut-off section;

[0051] 432) Assign the actual mass M parameter to the stones;

[0052] 433) Define the initial velocity field of the stone based on its impact velocity V0 and direction;

[0053] 434) Based on the speed V of the vehicle that was hit output Define the initial velocity field of the stone in the opposite direction of its travel.

[0054] Furthermore, the specific method for step five is as follows:

[0055] 51) Select the impact location to be evaluated. The height of the location from the ground is z0. Substitute it into formula (3) to obtain the horizontal displacement x0 of the stone. The above gives the coordinate position of the stone at the impact location in the coordinate system ZOX in the plane of the trajectory line of the stone thrown by the vehicle tire. At this time, there are two x0 positions, which correspond to the upper and lower segments of the parabola. Select the working condition to be examined according to the position.

[0056] 52) Determine whether the stone impact occurs in the upper or lower throwing segment. Based on the trajectory equation of the stone, i.e., formula (3), determine the direction of motion of the stone at the moment of impact. The slope of the stone's motion in the upper throwing segment is formula (4), and the slope of the stone's motion in the lower throwing segment is formula (5).

[0057]

[0058]

[0059] In the formula, x0 is the horizontal displacement of the stone; g is the acceleration due to gravity; V0 is the impact velocity of the stone.

[0060] 53) According to the law of conservation of energy, the kinetic energy loss of the stone is converted into the potential energy increase, as shown in formula (6); the velocity V0 of the stone at the moment of impact is obtained, as shown in formula (7);

[0061]

[0062]

[0063] In the formula, M is the mass of the gravel; V outputV0 represents the speed of the vehicle being hit; V0 represents the impact speed of the stone; and Z0 represents the height of the location from the ground.

[0064] Furthermore, the specific method for step six is ​​as follows:

[0065] 61) Based on the outer contour of the intersection of the trajectory plane of the stone and the CAS plane at the impact point, and combined with the determined direction of motion of the stone at the moment of impact, calculate the impact angle θ of the stone at the impact point.

[0066] 62) Based on the determined impact velocity V0 of the stone at the impact point and the determined impact angle θ of the stone at the impact point, and the speed V of the vehicle being hit... iutput And direction, to synthesize velocity, the resultant velocity is perpendicular to the plane of the trajectory line thrown by the stone and intersects the CAS plane at the impact point, the normal component of the trajectory line is V vertical ;

[0067] 63) Optimize the load conditions;

[0068] Determine the objective function: the normal velocity V perpendicular to the CAS plane at the impact location. vertical maximum;

[0069] Define the constraints: the range of the throwing angle α of the stone. min ~α max ;

[0070] Determine the target variable: the speed at which the vehicle throws out stones, V. output ;

[0071] Finally, the range of the angle α at which the vehicle throws out the stone, satisfying the objective function, is determined to be within α. min ~α max Speed ​​V output Based on this, the load is determined according to the working condition load conditions calculated in step five.

[0072] Secondly, embodiments of the present invention also provide a device for simulating and analyzing load design of a car body panel during a stone impact while the car is in motion, comprising:

[0073] The definition module is used to define the model coordinate system;

[0074] The first decomposition module is used to decompose the chain force at a certain rotational speed ω;

[0075] The second decomposition module is used to decompose the centrifugal force at a certain rotational speed ω.

[0076] The first module for generating load history diagrams is used to generate load history diagrams under the coupled action of chain force and centrifugal force at a certain rotational speed ω.

[0077] The second module generates a load history diagram, which is used to create a load history diagram for the entire rotational speed.

[0078] The extraction module is used to extract key typical loads, which are used as load inputs for finite element analysis.

[0079] Thirdly, a terminal is provided, including:

[0080] One or more processors;

[0081] Memory for storing the one or more processor-executable instructions;

[0082] Wherein, the one or more processors are configured as follows:

[0083] Perform the method described in the first aspect of the embodiments of the present invention.

[0084] 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.

[0085] 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.

[0086] The beneficial effects of this invention are as follows:

[0087] This invention provides a load design method for simulating stone impact on automotive body panels based on the location of different exterior body panels of the impacted vehicle and variables such as driving parameters. This method provides a basis for determining loads and working conditions for conducting corresponding simulation analysis and evaluation of automotive body panels during the automotive development stage, and provides strong support for the development of stone impact resistance performance of automotive body panels. Attached Figure Description

[0088] 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.

[0089] Figure 1 This is a flowchart of a simulation analysis load design method for a car body panel during a car's driving process, as described in this invention.

[0090] Figure 2 A schematic diagram of the trajectory of stones thrown out of a wheel and impacting its own structure or external vehicles.

[0091] Figure 3 This is a schematic diagram of the vehicle's exterior.

[0092] Figure 4a A schematic diagram of the topographic equation for the lower half of the tire's outer contour;

[0093] Figure 4b A schematic diagram of the topographic equation of the upper half of the tire's outer contour;

[0094] Figure 5 A schematic diagram illustrating the trajectory equation of a thrown stone.

[0095] Figure 6a The front impact zone of the vehicle's CAS (Compactor Surface Arm) outer covering.

[0096] Figure 6b The rear impact zone of the vehicle's CAS (Compactor Surface Arm) outer covering.

[0097] Figure 6c The side impact zone of the vehicle's CAS (Compactor Surface Arm) outer covering.

[0098] Figure 6d The impact-affected area on the top of the vehicle's CAS (Compactor Surface Arm) outer panel.

[0099] Figure 7 This is a schematic diagram of a frontal impact scenario;

[0100] Figure 8 This is a schematic diagram of a side impact scenario;

[0101] Figure 9 This is a schematic diagram of a rear-end collision scenario.

[0102] Figure 10 This is a schematic diagram of a top impact scenario;

[0103] Figure 11 This is a schematic diagram of velocity synthesis.

[0104] Figure 12 A schematic diagram of the trajectory line of a thrown stone;

[0105] Figure 13 This is a schematic diagram of the load design device for simulating and analyzing stone impacts on a car body panel during vehicle operation, as described in this invention.

[0106] Figure 14 This is a schematic block diagram of a terminal structure. Detailed Implementation

[0107] 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.

[0108] 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.

[0109] Example 1

[0110] Figure 1 This is a flowchart of a method for designing a simulated load analysis of a stone impact on a car body panel during vehicle operation, provided in Embodiment 1 of the present invention. This embodiment is applicable to the case of designing a simulated load analysis of a stone impact on a car body panel during vehicle operation. This method can be executed by a device for designing a simulated load analysis of a stone impact on a car body panel during vehicle operation, provided in this embodiment of the present invention. This device can be implemented in software and / or hardware.

[0111] See Figure 1 This embodiment provides a simulation analysis load design method for stone impact on automotive body panels during vehicle movement. It focuses on the relationship between the trajectory of stones ejected from the tires and the motion state of the impacted vehicle. Within a certain range of the wheel, stones ejected from the wheel impact its own structure or external vehicles. Figure 2 As shown, the vehicle that throws stones on trajectory line A is the same as the vehicle that is hit, while the vehicle that throws stones on trajectory line B is different from the vehicle that is hit. The specific method is as follows:

[0112] Step 1: Determine the initial parameters of the tire and the thrown stone. The initial parameters are the specific input data required in the process of obtaining the stone impact load.

[0113] The initial parameters include:

[0114] a1) Tire radius R, to determine the initial position height and ejection speed;

[0115] a2) Angle range of the ejection velocity α min ~α max ;

[0116] a3) Gravitational acceleration g;

[0117] a4) The speed at which the vehicle throws out stones, V output ;

[0118] a5) Vehicle impact speed V iutput ;

[0119] a6) Mass of the gravel, M;

[0120] a7) Stone impact velocity V0: the velocity of the stone at the point of impact;

[0121] a8) The horizontal displacement X, vertical displacement Z and the coordinates of the impact point (x0, z0) of the stone thrown out;

[0122] a9) The angle θ between the impact direction and the impact point surface of the CAS surface, and the impact parabola and the impact point CA Step 2: Determine the variables of the stone being thrown out and construct the motion coordinates;

[0123] Determine the variables related to stone ejection: When determining the operating conditions for different components and locations on the automotive body panel, it is necessary to adjust the corresponding parameters to determine the extreme operating conditions for each location. The parameters that are adjusted according to specific circumstances and are considered variables include:

[0124] b1) The angle at which the stone is thrown is α;

[0125] b2) Mass of the stone, M;

[0126] b3) Vehicle speed V after throwing out stones output ;

[0127] b4) Horizontal displacement of the stone x0.

[0128] The vertical plane in the direction in which the tire throws the stone is taken as the ZOX plane. A coordinate system ZOX is constructed within this plane, as follows: Figure 3 As shown, the specific method for constructing a motion coordinate system is as follows:

[0129] 21) Define the origin O; take the point where the vehicle's tires touch the ground as the origin O;

[0130] 22) Define the X-axis; define the horizontal direction of the launch direction as the X-axis direction;

[0131] 23) Define the Z-axis; define the vertical upward direction as the positive direction of the Z-axis.

[0132] Step 3: Construct the trajectory equation of the thrown stone in the motion coordinate system and perform numerical plotting;

[0133] 31) Construct the equation for the outer contour of the wheel, such as... Figure 4a and Figure 4b As shown, where, Figure 4a The equation for the shape of the lower half of the tire outline is given in formula (1). Figure 4b The topographic equation for the upper half of the tire's outer contour is given in formula (2).

[0134]

[0135]

[0136] In the formula, R is the tire radius;

[0137] 32) Construct the trajectory equation of the thrown stone, such as... Figure 5As shown, the trajectory equation of the stone is given by formula (3);

[0138]

[0139] In the formula, V0 is the impact velocity of the stone; α is the angle at which the stone is thrown; and R is the tire radius.

[0140] 33) Draw the tire's outer contour equation and numerical trajectory diagram;

[0141] 34) Draw a numerical trajectory graph of a specific combination of variables and parameters.

[0142] Step 4: Based on the actual driving and usage scenarios of the vehicle after an impact, and combined with the specific location of the vehicle's outer body panels, define the impact conditions of the main outer body panels.

[0143] 41) Delineate the impact zones of the vehicle's CAS (Compact Area Covering) exterior panels: The impact zones include the front, rear, side, and top areas, such as... Figure 6a , Figure 6b , Figure 6c and Figure 6d As shown;

[0144] 42) Impact Conditions in Four Regions: Based on the four regions defined in step 41), describe the impact conditions in each region. Use any cross-section of the vehicle's outer CAS (Carbon Casing) to illustrate the impact conditions at the four locations. The specific cross-section is determined according to actual requirements. The specific impact conditions are as follows:

[0145] Frontal impact Figure 7 As shown in the figure, the impact angle and velocity are randomly given at 3 locations;

[0146] Side impact Figure 8 As shown in the figure, the impact angle and velocity are randomly given at two locations;

[0147] Rear impact Figure 9 As shown in the figure, the impact angle and velocity are randomly given at 3 locations;

[0148] Top impact Figure 10 As shown in the figure, the impact angle and velocity are randomly given at two locations;

[0149] 43) Based on the operating conditions defined in step 42), the load step operating conditions are simplified as follows:

[0150] Constraint features:

[0151] 431) The CAS impact location corresponds to the connection point between the assembly and the environmental components or the location of a partial cut-off section;

[0152] Loading features:

[0153] 432) Assign the actual mass M parameter to the stones;

[0154] 433) Define the initial velocity field of the stone based on its impact velocity V0 and direction;

[0155] 434) Based on the speed V of the vehicle that was hit output Define the initial velocity field of the stone in the opposite direction of its travel.

[0156] Step 5: Calculate the load conditions for the operating condition;

[0157] 51) Select the impact location to be evaluated. The height of the location from the ground is z0. Substitute it into formula (3) to obtain the horizontal displacement x0 of the stone. The above gives the coordinate position of the stone at the impact location in the coordinate system ZOX in the plane of the trajectory line of the stone thrown by the vehicle tire. At this time, there are two x0 positions, which correspond to the upper and lower segments of the parabola. Select the working condition to be examined according to the position.

[0158] 52) Determine whether the stone impact occurs in the upper or lower throwing segment. Based on the trajectory equation of the stone, i.e., formula (3), determine the direction of motion of the stone at the moment of impact. The slope of the stone's motion in the upper throwing segment is formula (4), and the slope of the stone's motion in the lower throwing segment is formula (5).

[0159]

[0160]

[0161] In the formula, x0 is the horizontal displacement of the stone; g is the acceleration due to gravity; V0 is the impact velocity of the stone.

[0162] 53) According to the law of conservation of energy, the kinetic energy loss of the stone is converted into the potential energy increase, as shown in formula (6); the velocity V0 of the stone at the moment of impact is obtained, as shown in formula (7);

[0163]

[0164]

[0165] In the formula, M is the mass of the gravel; V output V0 represents the speed of the vehicle being hit; V0 represents the impact speed of the stone; and Z0 represents the height of the location from the ground.

[0166] Step 6: Optimize load conditions.

[0167] 61) Based on the outer contour of the intersection of the trajectory plane of the stone and the CAS plane at the impact point, and combined with the determined direction of motion of the stone at the moment of impact, calculate the impact angle θ of the stone at the impact point.

[0168] 62) Based on the determined impact velocity V0 of the stone at the impact point and the determined impact angle θ of the stone at the impact point, and the speed V of the vehicle being hit... iutput And direction, to synthesize velocity, the resultant velocity is perpendicular to the plane of the trajectory line thrown by the stone and intersects the CAS plane at the impact point, the normal component of the trajectory line is V vertical ,like Figure 1 As shown;

[0169] 63) Optimize the load conditions;

[0170] Determine the objective function: the normal velocity V perpendicular to the CAS plane at the impact location. vertical maximum;

[0171] Define the constraints: the range of the throwing angle α of the stone. min ~α max ;

[0172] Determine the target variable: the speed at which the vehicle throws out stones, V. output ;

[0173] Finally, the range of the angle α at which the vehicle throws out the stone, satisfying the objective function, is determined to be within α. min ~α max Speed ​​V output Based on this, the load is determined according to the working condition load conditions calculated in step five.

[0174] Example 2

[0175] This embodiment provides a method for creating a trajectory image of a thrown stone, assuming the following parameters: vehicle (throwing stones) tire radius R = 200mm, vehicle (throwing stones) speed V. output =10m / s, throw angle α range (10°~45°), draw the trajectory lines of the stone thrown at throw angles of 10°, 30°, and 45° respectively (including the tire outline), such as Figure 12 As shown in the figure. The dashed line trajectory is the trajectory of the stone when the throwing angle α is set to 10°; the dotted line trajectory is the trajectory of the stone when the throwing angle α is set to 30°; and the double-dotted line trajectory is the trajectory of the stone when the throwing angle α is set to 45°.

[0176] In summary, the load design method of this invention, based on the simulation analysis of stone impact on automotive body panels and variables such as the position of different outer body panels of the impacted vehicle and driving parameters, provides a basis for determining loads and working conditions for the corresponding simulation analysis and evaluation of automotive body panels during the automotive development stage, and provides strong support for the development of stone impact resistance performance of automotive body panels.

[0177] Example 3

[0178] See Figure 13A device for simulating and analyzing the load design of a car body panel during stone impact while the car is in motion, comprising:

[0179] The definition module is used to define the model coordinate system;

[0180] The first decomposition module is used to decompose the chain force at a certain rotational speed ω;

[0181] The second decomposition module is used to decompose the centrifugal force at a certain rotational speed ω.

[0182] The first module for generating load history diagrams is used to generate load history diagrams under the coupled action of chain force and centrifugal force at a certain rotational speed ω.

[0183] The second module generates a load history diagram, which is used to create a load history diagram for the entire rotational speed.

[0184] The extraction module is used to extract key typical loads, which are used as load inputs for finite element analysis.

[0185] Example 4

[0186] Figure 14 This is a structural block diagram of a terminal provided in an embodiment of this application. The terminal can be the terminal described 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.

[0187] Typically, a terminal includes a processor 301 and a memory 302.

[0188] 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.

[0189] The memory 302 may include one or more computer-readable storage media, which may be tangible and non-transitory. The 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 the memory 302 is used to store at least one instruction, which is executed by the processor 301 to implement the load design method for simulation analysis of stone impact on a vehicle body panel during vehicle operation provided in this application.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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).

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] Those skilled in the art will understand that Figure 14 The 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.

[0199] Example 5

[0200] In an exemplary embodiment, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements a load design method for simulation analysis of stone impact on a car body panel during car driving, as provided in all embodiments of the present application.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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).

[0205] Example 6

[0206] 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 complete the aforementioned method for simulation analysis of load design of automobile body panels during automobile driving.

[0207] 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 designing loads based on simulation analysis of stone impacts on a vehicle body panel during vehicle operation, characterized in that, Includes the following steps: Step 1: Determine the initial parameters of the tire and the thrown stone. The initial parameters are the specific input data required in the process of obtaining the stone impact load. Step 2: Determine the variables for the stone's trajectory and construct its motion coordinates; Step 3: Construct the trajectory equation of the thrown stone in the motion coordinate system and perform numerical plotting; Step 4: Based on the actual driving and usage scenarios of the vehicle after an impact, and combined with the specific location of the vehicle's outer body panels, define the impact conditions of the main outer body panels. Step 5: Calculate the load conditions for the operating condition; Step 6: Optimize load conditions; The specific method for step four is as follows: 41) Delineate the impact zones of the vehicle's CAS (Compacts and Accessories) exterior body panels: The impact zones include the front, rear, side, and top areas; 42) Impact Conditions in Four Regions: Based on the four regions defined in step 41), describe the impact conditions in each region. Use any cross-section of the vehicle's outer CAS (Carbon Casing) to illustrate the impact conditions at the four locations. The specific cross-section will be determined based on actual requirements. The specific impact conditions are as follows: During a frontal impact, three impact angles and velocities are randomly assigned. In a lateral impact, two positions are randomly assigned with different impact angles and velocities. During a rear-end collision, three impact angles and velocities are randomly assigned. Upon impact from the top, two points are randomly assigned with different impact angles and velocities. 43) Based on the operating conditions defined in step 42), the load step operating conditions are simplified as follows: 431) The CAS impact location corresponds to the connection point between the assembly and the environmental components, or the location of a partial cut-off section; 432) Assign the actual mass M parameter to the stones; 433) Based on the impact speed of the stone The initial velocity field of the stone is defined by its direction; 434) Based on the speed of the vehicle being hit Define the initial velocity field of the stone in the opposite direction of its travel; The specific method for step six is ​​as follows: 61) Based on the outer contour of the intersection of the trajectory plane of the stone and the CAS plane at the impact point, and combined with the determined direction of motion of the stone at the moment of impact, calculate the impact angle θ of the stone at the impact point. 62) Based on the determined stone impact speed The impact angle θ of the stone at the determined impact point, and the impact speed of the vehicle. And direction, to synthesize velocity, the resultant velocity is perpendicular to the plane of the trajectory line of the stone thrown out and intersects the CAS plane of the impact point, the normal component of the trajectory line is. ; 63) Optimize the load conditions; Determine the objective function: the normal velocity perpendicular to the CAS plane at the impact location. maximum; Define the constraints: the range of the throwing angle α of the stone. ~ ; The target variable is: the speed of the vehicle that was hit. ; Finally, the range of the stone throwing angle α that satisfies the objective function was determined to be within... ~ Based on this, the load is determined according to the working condition load conditions calculated in step five.

2. The method for designing loads in a simulation analysis of stone impact on a vehicle body panel during vehicle operation, as described in claim 1, is characterized in that... In step one, the initial parameters include: a1) Tire radius R, to determine the initial position height and ejection speed; a2) Range of angles of the ejected speed ~ ; a3) Gravitational acceleration g; a4) The speed of the vehicle that was hit ; a5) Vehicle impact speed ; a6) Mass of the gravel, M; a7) Stone impact speed ; a8) The horizontal displacement X, vertical displacement Z, and coordinates of the impact point of the stone after it is thrown ( , ); a9) The angle θ between the impact direction and the surface of the CAS impact point, and the angle between the impact parabolic surface and the normal plane of the CAS surface at the impact point.

3. The method for designing loads in a simulation analysis of stone impacts on a vehicle body panel during vehicle operation, as described in claim 1, is characterized in that... In step two, the variables related to the throwing of the stones include: b1) The angle at which the pebble is thrown is α; b2) Mass of the stone, M; b3) The speed of the vehicle that was hit ; b4) Horizontal displacement of stones .

4. The method for designing loads based on simulation analysis of stone impact on a vehicle body panel during vehicle operation, as described in claim 1, is characterized in that... In step two, the specific method for constructing the motion coordinate system is as follows: 21) Define the origin O; take the point where the vehicle's tires touch the ground as the origin O; 22) Define the X-axis; define the horizontal direction of the launch direction as the X-axis direction; 23) Define the Z-axis; define the vertical upward direction as the positive direction of the Z-axis.

5. The method for designing loads in a simulation analysis of stone impact on a vehicle body panel during vehicle operation, as described in claim 1, is characterized in that... The specific method for step three is as follows: 31) Construct the wheel outer contour equation. The shape equation of the lower half of the tire outer contour is formula (1), and the shape equation of the upper half of the tire outer contour is formula (2). （1） （2） In the formula, The radius of the tire; 32) Construct the trajectory equation of the stone being thrown out. The trajectory equation of the stone being thrown out is formula (3); （3） In the formula, α represents the impact velocity of the stone; α is the angle at which the stone is thrown. The radius of the tire; 33) Construct the tire outer contour equation and numerical trajectory diagram; 34) Construct a numerical trajectory graph of a specific combination of variables and parameters.

6. The method for designing loads in a simulation analysis of stone impact on a vehicle body panel during vehicle operation, as described in claim 5, is characterized in that... The specific method for step five is as follows: 51) Select the impact location to be evaluated; the height of the location from the ground is... And substitute it into formula (3) to obtain the horizontal displacement of the stone. The above gives the coordinates of the stone at the impact point within the ZOX coordinate system on the plane of the trajectory line of the stone ejected from the vehicle's tires. This is the coordinate system found at this point. There are two locations, corresponding to the upper and lower segments of the parabola, respectively. Choose the working condition to be investigated based on the location. 52) Determine whether the stone impact occurs in the upper or lower throwing segment. Based on the trajectory equation of the stone, i.e., formula (3), determine the direction of motion of the stone at the moment of impact. The slope of the stone's motion in the upper throwing segment is formula (4), and the slope of the stone's motion in the lower throwing segment is formula (5). （4） In the formula, ρ is the horizontal displacement of the stone; g is the acceleration due to gravity; The impact velocity of the stone; 53) According to the law of conservation of energy, the kinetic energy loss of the stone is converted into an increase in potential energy, as shown in formula (6); thus, the impact velocity of the stone is obtained. , as in formula (7); （6） （7） In the formula, M is the mass of the stone; The speed of the vehicle that was hit; The impact velocity of the stone; The height of the location from the ground.

7. A device for simulating and analyzing the load design of a car body panel during a stone impact while the car is in motion, used to implement the method for simulating and analyzing the load design of a car body panel during a stone impact while the car is in motion as described in claim 1, characterized in that, include: The first determining module is used to determine the initial parameters of the tire and the thrown stone. The initial parameters are specific input data required in the process of obtaining the stone impact load. The second determining module is used to determine the variables of the stone being thrown out and to construct the motion coordinates; The module is used to construct the trajectory equation of the thrown stone in the motion coordinate system and perform numerical plotting. The definition module is used to define the impact conditions of the main outer coverings based on the actual driving and use scenarios of the vehicle being impacted, combined with the specific location of the vehicle's outer coverings. The calculation module is used to calculate the load conditions under the operating conditions; The optimization module is used to optimize load conditions.

8. 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: The method described in any one of claims 1 to 6 is used to perform a simulation analysis load design method for a car body panel during a car's driving process when a stone impacts the body panel.

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