Tire crown arc parameter determination method and device

Abstract

The invention discloses a tire crown arc parameter determination method and device. The method comprises the steps that a tire initial section material distribution diagram is obtained, a crown arc is divided into multiple sections of sub crown arcs, the total arc width is configured, and target crown arc parameters are to be set; the target crown arc parameters comprise the total arc height and the arc width and radius of each sub crown arc; the following steps are repeated: firstly, preset crown arc parameters are added into the initial material distribution diagram in each cycle to generate a complete distribution diagram; a three-dimensional finite element tire model is constructed based on the three-dimensional finite element tire model, simulation is carried out under specific conditions, and the grounding mark form and pressure distribution are evaluated; if the result does not meet the preset condition, the target crown arc parameter is adjusted according to the priority and the step length, and the adjusted parameter is used for the next cycle; once the grounding mark form and the pressure distribution reach preset standards, the process is ended. The technical problem that it is difficult to accurately adjust crown arc parameters to optimize grounding marks and improve tire performance in traditional tire design is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tire production design, in particular to a method and device for determining tire crown arc parameters. BACKGROUND

[0002] With the development of the automobile industry, the requirements for the comprehensive performance of tires are increasing, especially in terms of wear uniformity, steering control and ride comfort. In view of this, the rounded rectangular contact patch has become a popular trend in tire design due to its unique advantages of balancing the above-mentioned performances. This shape of contact patch can ensure that the pressure distribution is more uniform when the tire is in contact with the ground, thereby prolonging the service life of the tire and improving the driving experience. Although the advantages of the rounded rectangular contact patch are significant, there are still many challenges in achieving this design goal. Currently, there is a lack of a mature systematic forward design process for the rounded rectangular contact patch in the market, which directly limits the speed and efficiency of product development and increases the high trial and error cost. In-depth research has found that the shape of the tire contact patch is highly dependent on the design of the contact surface curve, while the design of the contact surface curve is often limited by the limitations of existing technologies. For example, although the multi-segment circular arc combination design attempts to simulate the characteristics of the rounded rectangular shape, it is limited in certain application scenarios and has strict parameter constraints, which reduces the flexibility and practicality of the method. On the other hand, although the complex curve transition design pursues smooth transition, it often leads to increased mold processing difficulty due to the complexity of the parameter system, which affects the industrialization process. In addition, existing tire design methods are mostly dependent on experience-driven reverse adjustment, and lack of clear models directly linking shape characteristics and performance indicators. Although this method is feasible to some extent, it lacks efficiency and is difficult to meet the market demand for rapid development.

[0003] At present, there is no effective solution to the above problems. SUMMARY

[0004] The embodiments of the present application provide a method and device for determining tire crown arc parameters to at least solve the technical problem that it is difficult to accurately adjust the crown arc parameters in traditional tire design to optimize the contact patch and improve the performance of the tire.

[0005] According to an aspect of the embodiments of the present application, a method for determining a tire crown arc parameter is provided. The method includes: obtaining an initial cross-sectional material distribution map of a tire, wherein in the initial cross-sectional material distribution map, a crown arc is divided into a plurality of sub-crown arcs, a total arc width of the crown arc is configured, and a target crown arc parameter is to be configured, and types of the target crown arc parameter include: a total arc height of the crown arc, an arc width of each sub-crown arc, and a corresponding arc radius; and performing the following steps in a loop: obtaining a target crown arc parameter of a current loop, adding the target crown arc parameter to the initial cross-sectional material distribution map to obtain a complete cross-sectional material distribution map, wherein a target crown arc parameter of a first loop is a set of preset crown arc parameters; constructing a three-dimensional finite element tire model based on the complete cross-sectional material distribution map, simulating the three-dimensional finite element tire model under a preset working condition, and determining a footprint shape and a ground pressure distribution state according to a simulation result; in a case where the footprint shape and the ground pressure distribution state do not satisfy a preset condition, adjusting the target crown arc parameter according to a preset parameter priority and an adjustment step, taking an adjusted target crown arc parameter as a target crown arc parameter of a next loop, and starting a next loop; and in a case where the footprint shape and the ground pressure distribution state satisfy the preset condition, ending the loop process.

[0006] Optionally, in the initial cross-sectional material distribution map, the crown arc is an axisymmetric shape, and each half of the crown arc on either side of the axis of symmetry includes: a first sub-crown arc, a second sub-crown arc, and a third sub-crown arc, from near to far from the axis of symmetry, and the first sub-crown arc, the second sub-crown arc, and the third sub-crown arc satisfy the following structural relationship: the first sub-crown arc is tangent to a first end point of the first sub-crown arc away from the axis of symmetry, a dividing point between the crown arc and a shoulder is an end point of the third sub-crown arc away from the axis of symmetry, the third sub-crown arc is tangent to a second end point of the third sub-crown arc close to the axis of symmetry, a straight line between the first end point and the second end point is the second sub-crown arc; and wherein the first arc width and the first arc radius of the first sub-crown arc, the second arc radius of the third sub-crown arc, and the total arc height of the crown arc are taken as the target crown arc parameter.

[0007] Optionally, the target crown arc parameter satisfies the following constraint condition: a≥0.5W, R3∈[2a,8a], In the formula, a represents the first arc width, R1 represents the first arc radius, R3 represents the second arc radius, h represents the total arc height of the crown arc, and W is half of the total arc width of the crown arc.

[0008] Optionally, the three-dimensional finite element tire model is constructed based on the complete cross-section material distribution map, and simulation is performed on the three-dimensional finite element tire model under a preset working condition, including: performing grid division on the complete cross-section material distribution map, and constructing a two-dimensional finite element tire model based on the grid-divided complete cross-section material distribution map; rotating the two-dimensional finite element tire model around the tire axis for one revolution to obtain the three-dimensional finite element tire model; performing a depression simulation on the three-dimensional finite element tire model under a preset standard load condition to obtain a simulation result.

[0009] Optionally, the footprint shape and the ground pressure distribution state are determined according to the simulation result, including: obtaining the footprint image and the ground pressure data in the simulation result; taking the center point of the footprint image as the origin, taking the tire axial direction as the horizontal axis direction, and taking the tire circumferential direction as the vertical axis direction, determining the first ground length in the vertical direction corresponding to the first horizontal coordinate of the corresponding shoulder area in the footprint image and the second ground length in the vertical direction corresponding to the second horizontal coordinate of the corresponding shoulder area, and taking the first ground length and the second ground length as the footprint shape, wherein the absolute value of the second horizontal coordinate is greater than the absolute value of the first horizontal coordinate; drawing the ground pressure distribution graph on the horizontal axis as the ground pressure distribution state according to the ground pressure data.

[0010] Optionally, the preset condition includes: the trend of the ground pressure distribution state presents a three-stage state from gradual increase to stability and then gradual decrease; the ratio of the first ground length to the second ground length is not less than a preset proportion threshold.

[0011] Optionally, the target crown arc parameter is adjusted according to the preset parameter priority and adjustment step, including: determining the target crown arc parameter to be adjusted in the current cycle according to the preset parameter priority, wherein only one target crown arc parameter is adjusted in one cycle, and the parameter priority from high to low is: the total arc height of the crown arc, the second arc radius, the first arc radius, and the first arc width; under the condition of meeting the constraint condition, the target crown arc parameter to be adjusted is adjusted based on the preset adjustment step corresponding to the target crown arc parameter to be adjusted.

[0012] According to another aspect of the embodiments of the present application, a device for determining tire crown arc parameters is also provided, comprising: an obtaining module configured to obtain an initial cross-sectional material distribution map of a tire, wherein in the initial cross-sectional material distribution map, a crown arc is divided into a plurality of sub-crown arcs, a total arc width of the crown arc is configured, and a target crown arc parameter is to be configured, and types of the target crown arc parameter include a total arc height of the crown arc, an arc width of each sub-crown arc, and a corresponding arc radius; a determining module configured to cyclically perform the following steps: obtaining a target crown arc parameter of a current cycle, adding the target crown arc parameter to the initial cross-sectional material distribution map to obtain a complete cross-sectional material distribution map, wherein a target crown arc parameter of a first cycle is a set of preset crown arc parameters; constructing a three-dimensional finite element tire model based on the complete cross-sectional material distribution map, simulating the three-dimensional finite element tire model under a preset working condition, and determining a footprint shape and a ground pressure distribution state according to a simulation result; in a case where the footprint shape and the ground pressure distribution state do not satisfy a preset condition, adjusting the target crown arc parameter according to a preset parameter priority and an adjustment step, taking an adjusted target crown arc parameter as a target crown arc parameter of a next cycle, and starting a next cycle; and in a case where the footprint shape and the ground pressure distribution state satisfy the preset condition, ending a cycle process.

[0013] According to another aspect of the embodiments of the present application, a computer program product is also provided, comprising: a computer program, wherein the computer program is executed by a processor to implement the tire crown arc parameter determination method described above.

[0014] According to another aspect of the embodiments of the present application, an electronic device is also provided, comprising: a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the tire crown arc parameter determination method described above through the computer program.

[0015] In the embodiment of the present application, by subdividing the crown arc into multiple sub-crown arcs and preconfiguring the total arc width of the crown arc, the target crown arc parameters (total arc height of the crown arc, arc width of each sub-crown arc and corresponding arc radius) are taken as the items to be configured. This method of decomposing the crown arc design into multiple independently adjustable parameters provides great design freedom, facilitating fine control and optimization. The design process is designed in the form of a cyclic iteration. Each cycle constructs a three-dimensional finite element model of the tire based on the current target crown arc parameters and performs simulation under a preset working condition. Through cyclic iteration, the target crown arc parameters are constantly adjusted until the footprint shape and ground pressure distribution state meet the preset conditions. This method greatly improves the efficiency and success rate of the design process. The formulation of the preset conditions is the key to ensuring the optimization of the overall performance of the tire. By setting the three-stage trend of the ground pressure distribution (increasing-plateau-decreasing) and the ratio of the first ground length to the second ground length not less than a preset proportion threshold, invalid adjustments are avoided, the design result converges to the optimal solution faster, and an ideal rounded rectangular footprint is formed when the tire lands, thereby solving the technical problem of being difficult to accurately adjust the crown arc parameters to optimize the footprint and improve the performance of the tire in the traditional tire design. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of this application and help to explain the present application together with the specification. The illustrative embodiments of the present application and their description serve to explain the present application. In the drawings:

[0017] Figure 1 is a flowchart of an optional tire crown arc parameter determination method according to an embodiment of the present application;

[0018] Figure 2 is a structural diagram of an optional multi-segment sub-crown arc according to an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of an optional rounded rectangular footprint according to an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of an optional conventional footprint according to an embodiment of the present application;

[0021] Figure 5 is a structural diagram of an optional tire crown arc parameter determination device according to an embodiment of the present application;

[0022] Figure 6 is a structural diagram of an optional electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application, so that those skilled in the art can better understand the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] Embodiment 1

[0026] According to the embodiments of the present application, a tire crown arc parameter determination method is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical sequence is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0027] Figure 1 is a flowchart of a tire crown arc parameter determination method according to an embodiment of the present application, as shown in Figure 1 the method comprises the following steps:

[0028] Step S102, obtaining an initial cross-sectional material distribution map of the tire, wherein in the initial cross-sectional material distribution map, the crown arc is divided into a plurality of sub-crown arcs, the total arc width of the crown arc is configured, the target crown arc parameter is to be configured, and the type of the target crown arc parameter includes the total arc height of the crown arc, the arc width of each sub-crown arc, and the corresponding arc radius;

[0029] Step S104, the following steps are executed in a loop:

[0030] obtaining the target crown arc parameter of the current loop, adding the target crown arc parameter to the initial cross-sectional material distribution map to obtain a complete cross-sectional material distribution map, wherein the target crown arc parameter of the first loop is a set of preset crown arc parameters;

[0031] construct a three-dimensional finite element tire model based on the complete cross-sectional material distribution map, and simulate the three-dimensional finite element tire model under a preset working condition, and determine the footprint shape and ground pressure distribution state according to the simulation result;

[0032] In the case that the footprint shape and the ground pressure distribution state do not meet the preset conditions, the target crown arc parameters are adjusted according to the preset parameter priority and adjustment step, the adjusted target crown arc parameters are taken as the target crown arc parameters of the next cycle, and the next cycle is started;

[0033] In the case that the footprint shape and the ground pressure distribution state meet the preset conditions, the cycle process is ended.

[0034] The steps of the tire crown arc parameter determination method will be described in combination with a specific implementation process.

[0035] An initial cross-sectional material distribution map of a tire is obtained, wherein in the initial cross-sectional material distribution map, the crown arc is divided into multiple sub-crown arcs, the total arc width of the crown arc is configured, the target crown arc parameters are to be configured, and the types of the target crown arc parameters include: total arc height of the crown arc, arc width of each sub-crown arc, and corresponding arc radius;

[0036] The following steps are executed in a cycle:

[0037] The target crown arc parameters of the current cycle are obtained, the target crown arc parameters are added to the initial cross-sectional material distribution map to obtain a complete cross-sectional material distribution map, wherein the target crown arc parameters of the initial cycle are a group of preset crown arc parameters;

[0038] construct a three-dimensional finite element tire model based on the complete cross-sectional material distribution map, and simulate the three-dimensional finite element tire model under a preset working condition, and determine the footprint shape and ground pressure distribution state according to the simulation result;

[0039] In the case that the footprint shape and the ground pressure distribution state do not meet the preset conditions, the target crown arc parameters are adjusted according to the preset parameter priority and adjustment step, the adjusted target crown arc parameters are taken as the target crown arc parameters of the next cycle, and the next cycle is started;

[0040] In the case that the footprint shape and the ground pressure distribution state meet the preset conditions, the cycle process is ended.

[0041] As an optional implementation, in the above process, in the initial cross-sectional material distribution diagram, the crown arc is an axisymmetric shape, and the half crown arc on either side of the symmetry axis includes: a first sub-crown arc, a second sub-crown arc and a third sub-crown arc from the symmetry axis, and the first sub-crown arc, the second sub-crown arc and the third sub-crown arc satisfy the following structural relationship: the first sub-crown arc is tangent to the target straight line at the first end point, the first end point is the end point of the first sub-crown arc away from the symmetry axis, the junction point of the crown arc and the shoulder is the end point of the third sub-crown arc away from the symmetry axis, the third sub-crown arc is tangent to the target straight line at the second end point, the second end point is the end point of the third sub-crown arc close to the symmetry axis, and the straight line between the first end point and the second end point is the second sub-crown arc; wherein the first arc width and the first arc radius of the first sub-crown arc, the second arc radius of the third sub-crown arc, and the total arc height of the crown arc are taken as target crown arc parameters.

[0042] For example, when the cycle is first performed, a set of preset crown arc parameters are selected as starting points, these parameters include but are not limited to the first arc width (a) of the first sub-crown arc, the first arc radius (R1), the second arc radius (R3) of the third sub-crown arc, and the total arc height (h) of the crown arc. The preset parameters may come from design specifications, industry standards or preliminary engineering estimates. In each subsequent cycle, specific crown arc parameters are adjusted based on the simulation results of the previous round. According to the preset parameter priority, the adjustment order is the total arc height (h) of the crown arc, the second arc radius (R3) of the third sub-crown arc, the first arc radius (R1) of the first sub-crown arc, and the first arc width (a).

[0043] For example, the crown arc is further divided into three sub-crown arcs, which are arranged in order of distance from the symmetry axis, the first sub-crown arc is located in the central part of the crown arc and is closest to the symmetry axis, it is tangent to the target straight line (tire crown edge line, representing the boundary of tire and ground contact) at the first end point, the first end point is the end point of the first sub-crown arc away from the symmetry axis, that is, the boundary point on the right side of the crown arc, the characteristic parameters of the first sub-crown arc include its first arc width (a) and first arc radius (R1). The second sub-crown arc is a transition region between the first sub-crown arc and the third sub-crown arc, which is composed of a straight line between the first end point and the second end point, responsible for connecting the central region and the shoulder, ensuring smooth transition of the crown arc shape. The third sub-crown arc is located in the shoulder of the crown arc and is farthest from the symmetry axis, the far end of the third sub-crown arc is the junction point of the crown arc and the shoulder, and the near end is tangent to the target straight line at the second end point, the second end point is the end point of the third sub-crown arc close to the symmetry axis, that is, the boundary point on the left side of the crown arc, the characteristic parameter of the third sub-crown arc is the second arc radius (R3), which together with the first arc radius of the first sub-crown arc determines the geometric shape and transition smoothness of the tire crown. The positions of the crown arcs are shown in Figure 2 Figure 2 ​In the formula, CLine is the symmetry axis, OLine is the horizontal axis, i.e., the horizontal line of the outer diameter of the tire, the first sub-crown arc is an arc line between the coordinate origin of the two axes and point O (the first end point), the arc line is an arc line with R1 (the first arc radius) as the center, the arc width (the first arc width) is a, Q is a point (the demarcation point between the crown arc and the tire shoulder) at a distance of h (the total arc height of the crown arc) from the horizontal axis OLine, an arc line (the third sub-crown arc) is made through the point Q with R3 (the second arc radius), the tangent line of the first sub-crown arc through the point O is tangent to the third sub-crown arc at the point P, the straight line between O and P is the second sub-crown arc, L2 is the length of the second sub-crown arc (the line segment OP), b is the projection length of the second sub-crown arc (the line segment OP) on the horizontal axis, and W is half of the total arc width of the crown arc.

[0044] As an optional implementation, the target crown arc parameter satisfies the following constraint condition:

[0045] a≥0.5W

[0046] R3∈[2a,8a]

[0047]

[0048] In the formula, a represents the first arc width, R1 represents the first arc radius, R3 represents the second arc radius, h represents the total arc height of the crown arc, and W is half of the total arc width of the crown arc.

[0049] As an optional implementation, the three-dimensional finite element tire model is constructed based on the complete cross-section material distribution map, and simulation is performed on the three-dimensional finite element tire model under a preset working condition, including: performing grid division on the complete cross-section material distribution map, and constructing a two-dimensional finite element tire model based on the complete cross-section material distribution map after the grid division; rotating the two-dimensional finite element tire model by one turn with the tire axis as the axis to obtain the three-dimensional finite element tire model; and performing a depression simulation on the three-dimensional finite element tire model under a preset standard load working condition to obtain a simulation result.

[0050] As an optional implementation, the footprint shape and the ground pressure distribution state are determined according to the simulation result, including: obtaining the footprint image and the ground pressure data in the simulation result; taking the center point of the footprint image as the origin, taking the tire axis direction as the horizontal axis direction, and taking the tire circumferential direction as the vertical axis direction, determining the first ground length in the vertical direction corresponding to the first horizontal coordinate of the corresponding tire shoulder area in the footprint image and the second ground length in the vertical direction corresponding to the second horizontal coordinate of the corresponding tire shoulder area, and taking the first ground length and the second ground length as the footprint shape, wherein the absolute value of the second horizontal coordinate is greater than the absolute value of the first horizontal coordinate; and drawing a ground pressure distribution graph on the horizontal axis according to the ground pressure data as the ground pressure distribution state.

[0051] For example, first, the analysis results are exported by professional finite element simulation software (such as ABAQUS, ANSYS, etc.), and the ground contact patch image and the ground pressure data are mainly obtained. The center point of the ground contact patch image is regarded as the origin, and a coordinate system is established based on this. In the coordinate system, the tire axial direction (the width direction of the tire) is designated as the horizontal axis direction, and the tire circumferential direction (the circumferential direction of the tire, i.e. the direction of the tire in contact with the ground) is set as the vertical axis direction. In the established coordinate system, the first horizontal coordinate (the horizontal coordinate position closer to the center point) and the second horizontal coordinate (the horizontal coordinate position farther from the center point) corresponding to the shoulder region in the ground contact patch image are determined. It is worth noting that the absolute value of the second horizontal coordinate is greater than the absolute value of the first horizontal coordinate, which usually means that the second horizontal coordinate is closer to the edge of the tire, i.e. the outermost side of the shoulder region. By reading the coordinate values, the first ground contact length in the longitudinal direction corresponding to the first horizontal coordinate and the second ground contact length in the longitudinal direction corresponding to the second horizontal coordinate are determined. These lengths reflect the actual size of the tire in contact with the ground in the circumferential direction and are important basis for evaluating the ground contact patch shape and evaluating the performance of the tire.

[0052] Figure 3 is a rounded rectangular ground contact patch image when the ground contact patch shape and the ground pressure distribution state in this embodiment meet the preset condition, as shown in Figure 3 The first horizontal coordinate corresponding to the shoulder region in the ground contact patch image can be at the 70% to 85% position of the imprint area from the center to both sides in the right or left area of the vertical axis. The corresponding longitudinal imprint length at this position is the first ground contact length SL1, which represents the effective contact length of the central region of the tire. The first horizontal coordinate corresponding to the shoulder region in the ground contact patch image can be at the 95% position of the imprint area from the center to both sides in the right or left area of the vertical axis. The corresponding longitudinal imprint length at this position is the second ground contact length SL2, which reflects the contact length of the edge or shoulder region of the tire.

[0053] As an optional implementation, the preset condition includes that the trend of the ground pressure distribution state presents a three-stage state from gradual increase to stability and then to gradual decrease, and the ratio of the first ground contact length to the second ground contact length is not less than a preset proportion threshold.

[0054] For example, the increasing phase is the initial stage of tire contact with the ground, where the pressure distribution gradually increases with the unfolding of the tire crown. This phase ensures a smooth start of tire contact with the ground, avoiding the impact and damage caused by instantaneous high pressure. The plateau phase is the stage where the tire further contacts the ground, and the ground pressure reaches a relatively stable platform. This interval corresponds to the central rectangular region of the tire footprint, representing the main contact area of the tire under load, ensuring sufficient support force and contact stability. The decreasing phase is the approach to the tire shoulder, where the ground pressure gradually decreases to zero. This pressure distribution ensures a smooth transition from the center to the edge of the tire, avoiding the loss of handling performance and uneven wear caused by the sharp decline in shoulder pressure. The ratio of the first contact length to the second contact length is not less than the preset proportion threshold, that is As a preset condition, it is to ensure a smoother transition in contact length between the central and shoulder regions of the tire, avoiding stress concentration and uneven wear caused by a short and sharp transition region. The setting of this length ratio helps to optimize the shape of the tire footprint, making it closer to the ideal rounded rectangle, and thus improving the overall performance of the tire.

[0055] As an optional implementation, the target crown arc parameters are adjusted according to the preset parameter priority and adjustment step size, including: determining the target crown arc parameter to be adjusted in the current cycle according to the preset parameter priority, wherein only one target crown arc parameter is adjusted in one cycle, and the parameter priority from high to low is: total arc height of crown arc, second arc radius, first arc radius, first arc width; under the condition of meeting the constraint condition, the target crown arc parameter to be adjusted is adjusted based on the preset adjustment step size corresponding to the target crown arc parameter to be adjusted.

[0056] For example, to achieve the design of a rounded rectangular tire footprint, four key target crown arc parameters need to be adjusted in multiple cycles to optimize the footprint shape and pressure distribution. These parameters are sorted by priority as follows: total arc height of crown arc (h), second arc radius of third sub-crown arc (R3), first arc radius of first sub-crown arc (R1), and first arc width of first sub-crown arc (a).

[0057] In each cycle, only one parameter is adjusted, which means that in the early stages of the cycle, the designer will first try to adjust the total crown arc height (h), and then the second arc radius of the third sub-crown arc (R3), followed by the first arc radius of the first sub-crown arc (R1), and finally the first arc width of the first sub-crown arc (a). It can be understood that the total crown arc height is first adjusted, and if the adjusted total crown arc height and other crown arc parameters meet the final preset conditions after simulation, the cycle is directly terminated. If the total crown arc height is adjusted multiple times and still does not meet the requirements, the total crown arc height closest to the final preset conditions is selected, and the second arc radius of the third sub-crown arc is adjusted based on this total crown arc height. If the adjusted second arc radius and other crown arc parameters meet the final preset conditions after simulation, the cycle is directly terminated. If the second arc radius is adjusted multiple times and still does not meet the requirements, the second arc radius closest to the final preset conditions is selected, and the second arc radius of the third sub-crown arc is adjusted based on this second arc radius. Similarly, other parameters are adjusted in this way. This single-step adjustment principle ensures that the most influential parameters are corrected first, thereby improving the efficiency and success rate of the entire design process. For each target crown arc parameter to be adjusted, there is a preset adjustment step to control the magnitude of each modification, avoid excessive fluctuations during parameter adjustment, and ensure design stability and predictability. The adjustment step of the total crown arc height (h) is Δh = 0.5 mm, the adjustment ratio of the second arc radius of the third sub-crown arc (R3) is The adjustment ratio of the first arc radius of the first sub-crown arc (R1) is The adjustment step of the first arc width of the first sub-crown arc (a) is Δa = 0.01W-0.05W, where W refers to half the total crown arc width.

[0058] Figure 3 is a rounded rectangular footprint diagram in which the footprint shape and ground pressure distribution state meet the preset conditions in this embodiment, Figure 4 is a conventional footprint diagram. It can be clearly seen that through the adjustment strategy of the target crown arc parameters and the iterative optimization process based on finite element simulation, a rounded rectangular footprint can be finally obtained. This specific shape of the footprint design aims to optimize the pressure distribution when the tire contacts the ground, in order to achieve better tire performance, including but not limited to improving wear resistance, handling stability, and ride comfort.

[0059] In the embodiments of the present application, by subdividing the crown arc into multiple sub-crown arcs and preconfiguring the total arc width of the crown arc, and taking the target crown arc parameters (the total arc height of the crown arc, the arc width of each sub-crown arc, and the corresponding arc radius) as the items to be configured, this design of the crown arc into multiple independently adjustable parameters provides great design freedom, facilitating fine control and optimization. The design process is designed in the form of a cyclic iteration, each cycle constructs a three-dimensional finite element model of the tire based on the current target crown arc parameters, and performs simulation under a preset working condition. Through cyclic iteration, the target crown arc parameters are constantly adjusted until the footprint shape and the ground pressure distribution state meet the preset conditions. This method greatly improves the efficiency and success rate of the design process. The formulation of the preset conditions is the key to ensuring the optimization of the overall performance of the tire. By setting the three-stage trend of the ground pressure distribution (increasing-plateau-decreasing) and the ratio of the first ground length to the second ground length not less than a preset proportion threshold, invalid adjustments are avoided, the design result converges to the optimal solution faster, and an ideal rounded rectangular footprint is formed when the tire lands, thereby solving the technical problem that it is difficult to accurately adjust the crown arc parameters to optimize the footprint and improve the performance of the tire in traditional tire design.

[0060] Embodiment 2

[0061] According to the embodiments of the present application, a tire crown arc parameter determination device for implementing the tire crown arc parameter determination method in Embodiment 1 is also provided, as shown in Figure 5 The tire crown arc parameter determination device at least includes an acquisition module 51 and a determination module 52, wherein:

[0062] The acquisition module 51 is configured to acquire an initial cross-sectional material distribution map of the tire, wherein in the initial cross-sectional material distribution map, the crown arc is divided into multiple sub-crown arcs, the total arc width of the crown arc is configured, and the target crown arc parameters are to be configured. The types of the target crown arc parameters include the total arc height of the crown arc, the arc width of each sub-crown arc, and the corresponding arc radius.

[0063] The determination module 52 is configured to cyclically execute the following steps:

[0064] Acquire the target crown arc parameters of the current cycle, add the target crown arc parameters to the initial cross-sectional material distribution map to obtain a complete cross-sectional material distribution map, wherein the target crown arc parameters of the initial cycle are a set of preset crown arc parameters.

[0065] Construct a three-dimensional finite element tire model based on the complete cross-sectional material distribution map, and perform simulation on the three-dimensional finite element tire model under a preset working condition, and determine the footprint shape and the ground pressure distribution state according to the simulation result.

[0066] In the case that the ground print shape and the ground pressure distribution state do not meet the preset conditions, the target crown arc parameters are adjusted according to the preset parameter priority and adjustment step length, the adjusted target crown arc parameters are taken as the target crown arc parameters of the next cycle, and the next cycle is started.

[0067] In the case that the ground print shape and the ground pressure distribution state meet the preset conditions, the cycle process is ended.

[0068] The functions of each module of the tire crown arc parameter determination device will be described in combination with a specific implementation process.

[0069] The acquisition module acquires an initial cross-sectional material distribution diagram of the tire, wherein in the initial cross-sectional material distribution diagram, the crown arc is divided into multiple sub-crown arcs, the total arc width of the crown arc is configured, the target crown arc parameters are to be configured, and the types of the target crown arc parameters include the total arc height of the crown arc, the arc width of each sub-crown arc, and the corresponding arc radius;

[0070] The determination module cyclically executes the following steps:

[0071] The target crown arc parameters of the current cycle are acquired, the target crown arc parameters are added to the initial cross-sectional material distribution diagram to obtain a complete cross-sectional material distribution diagram, wherein the target crown arc parameters of the initial cycle are a group of preset crown arc parameters;

[0072] A three-dimensional finite element tire model is constructed based on the complete cross-sectional material distribution diagram, and the three-dimensional finite element tire model is simulated under a preset working condition, and the ground print shape and the ground pressure distribution state are determined according to the simulation result;

[0073] In the case that the ground print shape and the ground pressure distribution state do not meet the preset conditions, the target crown arc parameters are adjusted according to the preset parameter priority and adjustment step length, the adjusted target crown arc parameters are taken as the target crown arc parameters of the next cycle, and the next cycle is started.

[0074] In the case that the ground print shape and the ground pressure distribution state meet the preset conditions, the cycle process is ended.

[0075] As an optional implementation, in the initial cross-sectional material distribution map, the crown arc is an axisymmetric shape, and in the half crown arc on either side of the symmetry axis, the first sub-crown arc, the second sub-crown arc and the third sub-crown arc are included from the symmetry axis to the far side, and the first sub-crown arc, the second sub-crown arc and the third sub-crown arc satisfy the following structural relationship: the first sub-crown arc is tangent to the target straight line at the first end point, the first end point is the end point of the first sub-crown arc away from the symmetry axis, the junction point of the crown arc and the shoulder is the end point of the third sub-crown arc away from the symmetry axis, the third sub-crown arc is tangent to the target straight line at the second end point, the second end point is the end point of the third sub-crown arc close to the symmetry axis, and the straight line between the first end point and the second end point is the second sub-crown arc; wherein the first arc width and the first arc radius of the first sub-crown arc, the second arc radius of the third sub-crown arc, and the total arc height of the crown arc are taken as target crown arc parameters.

[0076] As an optional implementation, the values of the target crown arc parameters satisfy the following constraint conditions:

[0077] a≥0.5W

[0078] R3∈[2a,8a]

[0079]

[0080] In the formula, a represents the first arc width, R1 represents the first arc radius, R3 represents the second arc radius, h represents the total arc height of the crown arc, and W is half of the total arc width of the crown arc.

[0081] As an optional implementation, a three-dimensional finite element tire model is constructed based on the complete cross-sectional material distribution map, and the three-dimensional finite element tire model is simulated under a preset working condition, including: the complete cross-sectional material distribution map is meshed, and a two-dimensional finite element tire model is constructed based on the meshed complete cross-sectional material distribution map; the two-dimensional finite element tire model is rotated one revolution around the tire axis to obtain a three-dimensional finite element tire model; the three-dimensional finite element tire model is simulated under a preset standard load condition to obtain a simulation result.

[0082] As an optional implementation, the footprint shape and the ground pressure distribution state are determined according to the simulation result, including: obtaining the footprint image and the ground pressure data in the simulation result; taking the center point of the footprint image as the origin, taking the tire axial direction as the horizontal axis direction, and taking the tire circumferential direction as the vertical axis direction, determining the first ground length in the vertical direction corresponding to the first horizontal coordinate of the corresponding shoulder area in the footprint image and the second ground length in the vertical direction corresponding to the second horizontal coordinate of the corresponding shoulder area, and taking the first ground length and the second ground length as the footprint shape, wherein the absolute value of the second horizontal coordinate is greater than the absolute value of the first horizontal coordinate; according to the ground pressure data, a ground pressure distribution graph on the horizontal axis is drawn as the ground pressure distribution state.

[0083] As an optional implementation, the preset condition comprises: a trend of the grounding pressure distribution state presents a three-stage state from increasing to stable to decreasing; and a ratio of the first grounding length to the second grounding length is not less than a preset proportion threshold.

[0084] As an optional implementation, the adjusting the target crown arc parameters according to the preset parameter priority and the adjustment step length comprises: determining the target crown arc parameters to be adjusted in a current cycle according to the preset parameter priority, wherein only one target crown arc parameter is adjusted in one cycle, and the parameter priority is in descending order as follows: the total crown arc height, the second arc radius, the first arc radius, and the first arc width; and adjusting the target crown arc parameters to be adjusted based on the preset adjustment step length corresponding to the target crown arc parameters to be adjusted, in a case where the constraint condition is met.

[0085] It should be noted that each module in the tire crown arc parameter determination apparatus in the embodiments of the present application corresponds to each implementation step of the tire crown arc parameter determination method in Embodiment 1, and since Embodiment 1 has been described in detail, the details not embodied in this embodiment can be referred to Embodiment 1, and will not be described in more detail here.

[0086] Embodiment 3

[0087] According to the embodiments of the present application, a computer program product is also provided, which comprises a computer program, wherein the computer program is executed by a processor to implement the tire crown arc parameter determination method in Embodiment 1.

[0088] According to the embodiments of the present application, a non-volatile storage medium is also provided, which comprises a stored computer program, wherein a device in which the non-volatile storage medium is located executes the tire crown arc parameter determination method in Embodiment 1 by running the computer program.

[0089] According to the embodiments of the present application, a processor is also provided, which is used to run a computer program, wherein the computer program is executed to implement the tire crown arc parameter determination method in Embodiment 1 when running.

[0090] According to the embodiments of the present application, an electronic device is also provided, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the tire crown arc parameter determination method in Embodiment 1 by the computer program.

[0091] Specifically, the computer program runs to implement the following steps: obtaining an initial cross-section material distribution map of the tire, wherein in the initial cross-section material distribution map, the crown arc is divided into a plurality of sub-crown arcs, the total arc width of the crown arc is configured, and the target crown arc parameters to be configured, and the types of the target crown arc parameters include: the total arc height of the crown arc, the arc width of each sub-crown arc, and the corresponding arc radius; cyclically performing the following steps: obtaining the target crown arc parameters of the current cycle, adding the target crown arc parameters to the initial cross-section material distribution map to obtain a complete cross-section material distribution map, wherein the target crown arc parameters of the initial cycle are a group of preset crown arc parameters; constructing a three-dimensional finite element tire model based on the complete cross-section material distribution map, and simulating the three-dimensional finite element tire model under a preset working condition, and determining the footprint shape and the ground pressure distribution state according to the simulation result; in the case that the footprint shape and the ground pressure distribution state do not meet the preset conditions, adjusting the target crown arc parameters according to the preset parameter priority and the adjustment step, taking the adjusted target crown arc parameters as the target crown arc parameters of the next cycle, and starting the next cycle; in the case that the footprint shape and the ground pressure distribution state meet the preset conditions, ending the cycle process.

[0092] As an optional implementation, the electronic device can exist in the form of a mobile terminal, a computer terminal, or a similar computing device. Figure 6 A hardware structure block diagram of an electronic device for implementing a tire crown arc parameter determination method is shown. As shown in Figure 6 , the electronic device 60 can include one or more (shown in the figure as 602a, 602b, …, 602n) processors 602 (the processor 602 can include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 604 for storing data, and a transmission device 606 for communication functions. In addition, it can also include a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which can be included as one of the ports in the BUS bus), a network interface, a power supply and / or a camera. Those skilled in the art can understand that Figure 6 The structure shown is only schematic, which does not limit the structure of the above-mentioned electronic device. For example, the electronic device 60 can include more or fewer components than Figure 6 shown, or have a different configuration than Figure 6 shown.

[0093] It should be noted that the one or more processors 602 and / or other data processing circuitry described above can be referred to herein generically as "data processing circuitry". The data processing circuitry can be embodied in whole or in part as software, hardware, firmware, or any combination thereof. In addition, the data processing circuitry can be a single standalone processing module, or it can be incorporated in whole or in part within any one of the other elements of the electronic device 60. As referred to in the embodiments herein, the data processing circuitry acts as a processor to control, for example, the selection of the variable resistance terminal path connected to the interface.

[0094] The memory 604 can be used to store software programs and modules for applications, such as program instructions / data storage for the tire crown arc parameter determination method described in the embodiments herein. The processor 602 can execute various functions and data processing, i.e., implement the vulnerability detection method of the application program described above, by running the software programs and modules stored in the memory 604. The memory 604 can include a high-speed random access memory, and can also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 604 can further include a memory disposed remotely with respect to the processor 602, which can be connected to the electronic device 60 through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0095] The transmission device 606 is configured to receive or send data via a network. Examples of the network include, but are not limited to, a wireless network provided by a communication provider of the electronic device 60. In one example, the transmission device 606 includes a network adapter (NIC), which can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 606 can be a radio frequency (RF) module, which is configured to communicate with the Internet in a wireless manner.

[0096] The display can be, for example, a touch screen liquid crystal display (LCD), which can enable a user to interact with the user interface of the electronic device 60.

[0097] The above-mentioned embodiment numbers are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0098] In the above-described embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0099] In several embodiments provided in the present application, it should be understood that the disclosed technology can be implemented by other ways. Among them, the above-described device embodiments are only schematic, for example, the division of units can be a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, units or modules, which can be electrical or other forms.

[0100] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e. they can be located in one place or distributed to multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0101] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0102] If the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art that contributes to the technical solutions or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0103] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A method for determining tire crown arc parameters, characterized in that, The method comprises the following steps of: obtaining an initial cross-sectional material distribution diagram of a tire, wherein, in the initial cross-sectional material distribution diagram, a crown arc is divided into multiple sub-crown arcs, a total arc width of the crown arc is configured, and target crown arc parameters are to be configured, types of the target crown arc parameters including a total arc height of the crown arc, an arc width of each sub-crown arc, and a corresponding arc radius; cyclically performing the following steps: obtaining target crown arc parameters of a current cycle, adding the target crown arc parameters to the initial cross-sectional material distribution diagram to obtain a complete cross-sectional material distribution diagram, wherein, the target crown arc parameters of a first cycle are a group of preset crown arc parameters; constructing a three-dimensional finite element tire model based on the complete cross-sectional material distribution diagram, and simulating the three-dimensional finite element tire model under a preset working condition to determine a footprint shape and a ground pressure distribution state according to a simulation result; in a case where the footprint shape and the ground pressure distribution state do not satisfy a preset condition, adjusting the target crown arc parameters according to a preset parameter priority and an adjustment step, taking the adjusted target crown arc parameters as target crown arc parameters of a next cycle, and starting the next cycle; in a case where the footprint shape and the ground pressure distribution state satisfy the preset condition, ending the cycle process.

2. The method according to claim 1, wherein, in the initial cross-sectional material distribution diagram, the crown arc is an axisymmetric shape, and in a half-crown arc on either side of the axis of symmetry, the half-crown arc comprises a first sub-crown arc, a second sub-crown arc, and a third sub-crown arc from near to far from the axis of symmetry, and the first sub-crown arc, the second sub-crown arc, and the third sub-crown arc satisfy the following structural relationship: the first sub-crown arc is tangent to a target straight line at a first end point, the first end point is an end point of the first sub-crown arc on a side away from the axis of symmetry, a demarcation point of the crown arc and a tire shoulder is an end point of the third sub-crown arc on a side away from the axis of symmetry, the third sub-crown arc is tangent to the target straight line at a second end point, the second end point is an end point of the third sub-crown arc on a side close to the axis of symmetry, and a straight line between the first end point and the second end point is the second sub-crown arc; wherein, a first arc width and a first arc radius of the first sub-crown arc, a second arc radius of the third sub-crown arc, and a total arc height of the crown arc are taken as the target crown arc parameters. The values of the target crown arc parameters satisfy the following constraint condition:

3. The method of claim 2, wherein, a≥0.5W R3∈[2a,8a] wherein, a represents the first arc width, R1 represents the first arc radius, R3 represents the second arc radius, h represents the total arc height of the crown arc, and W is half of the total arc width of the crown arc. The three-dimensional finite element tire model is constructed based on the complete cross-sectional material distribution diagram, and the three-dimensional finite element tire model is simulated under a preset working condition, and the simulation result is determined according to the simulation result, comprising the following steps of:

4. The method of claim 1, wherein, dividing a grid of the complete cross-sectional material distribution diagram, and constructing a two-dimensional finite element tire model based on the grid-divided complete cross-sectional material distribution diagram; rotating the two-dimensional finite element tire model around a tire axis for one revolution to obtain the three-dimensional finite element tire model; performing a compression simulation of the three-dimensional finite element tire model under a preset standard load working condition to obtain a simulation result. ​ 5. The method of claim 1, wherein, Determine the ground footprint shape and the ground pressure distribution state according to the simulation result, including: Obtain the ground footprint image and the ground pressure data in the simulation result; Determine the first ground length corresponding to the first lateral coordinate of the shoulder region in the ground footprint image and the second ground length corresponding to the second lateral coordinate of the shoulder region in the longitudinal direction, taking the center point of the ground footprint image as the origin, taking the tire axial direction as the horizontal axis direction, and taking the tire circumferential direction as the longitudinal axis direction, and take the first ground length and the second ground length as the ground footprint shape, wherein the absolute value of the second lateral coordinate is greater than the absolute value of the first lateral coordinate; Draw the ground pressure distribution graph on the horizontal axis as the ground pressure distribution state according to the ground pressure data.

6. The method of claim 5, wherein, The preset condition includes: The trend of the ground pressure distribution state presents a three-stage state from gradual increase to stability and then to gradual decrease; The ratio of the first ground length to the second ground length is not less than a preset proportion threshold.

7. The method of claim 3, wherein, Adjust the target crown arc parameters according to the preset parameter priority and adjustment step, including: Determine the target crown arc parameters to be adjusted in the current cycle according to the preset parameter priority, wherein only one target crown arc parameter is adjusted in one cycle, and the parameter priority from high to low is: the total crown arc height, the second arc radius, the first arc radius, and the first arc width; Adjust the target crown arc parameters to be adjusted based on the preset adjustment step corresponding to the target crown arc parameters to be adjusted under the condition that the constraint condition is met.

8. A tire crown arc parameter determination device characterized by comprising: Including: An acquisition module is configured to acquire an initial cross-sectional material distribution diagram of a tire, wherein in the initial cross-sectional material distribution diagram, a crown arc is divided into multiple sub-crown arcs, a total crown arc width has been configured, target crown arc parameters are to be configured, and types of the target crown arc parameters include a total crown arc height, arc widths of each sub-crown arc, and corresponding arc radii; A determination module is configured to cyclically execute the following steps: Acquire target crown arc parameters in a current cycle, add the target crown arc parameters to the initial cross-sectional material distribution diagram to obtain a complete cross-sectional material distribution diagram, wherein the target crown arc parameters in the initial cycle are a group of preset crown arc parameters; Construct a three-dimensional finite element tire model based on the complete cross-sectional material distribution diagram, simulate the three-dimensional finite element tire model under a preset working condition, and determine a ground footprint shape and a ground pressure distribution state according to a simulation result; In a case where the ground footprint shape and the ground pressure distribution state do not meet a preset condition, adjust the target crown arc parameters according to a preset parameter priority and adjustment step, take the adjusted target crown arc parameters as target crown arc parameters in a next cycle, and start the next cycle; In a case where the ground footprint shape and the ground pressure distribution state meet the preset condition, end the cycle process.

9. A computer program product, characterised in that, Including: A computer program, wherein the computer program is executed by a processor to implement the tire crown arc parameter determination method of any one of claims 1 to 7.

10. An electronic device, comprising: Including: A memory and a processor, wherein the memory has stored therein a computer program, and the processor is configured to execute the tire crown arc parameter determination method of any one of claims 1 to 7 by means of the computer program.

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