Tire shoulder finite element mesh division method, device and tire simulation system

Abstract

The present application provides a method, device and tire simulation system for dividing a finite element mesh of a tire shoulder, the method comprising: obtaining a distribution map of the tire shoulder area, obtaining a regional boundary line of the shoulder area, sequentially connecting the intersection points of the regional boundary lines to form a polygon; identifying an area in the shoulder area where the stress is less than the stress threshold under any working condition to obtain a low stress area; dividing a triangle in the polygon, the triangle is located in the low stress area and at least two sides of the triangle are located on the sides of the polygon; dividing the meshes in the remaining areas of the triangle and the polygon respectively to obtain a preliminary mesh; extending the preliminary mesh so that both ends of any grid line are located on the regional boundary line to obtain a finite element mesh of the shoulder. The method solves the problem of poor simulation effect of the tire tread shoulder finite element mesh automatic division method in the prior art.

Description

Technical Field

[0001] The present application relates to the field of tire finite element analysis, and in particular, to a method, device, computer-readable storage medium, processor and tire simulation system for dividing a tire shoulder finite element grid. Background Art

[0002] Due to the rise of finite element analysis software and the expansion of its functions, it has appeared in the product development and design stages of many industries. The tire industry is no exception. Whether it is static force analysis of tires or dynamic response analysis of vehicles, finite element analysis has become an indispensable means for the design and optimization of tire products.

[0003] However, the tire finite element analysis process is relatively cumbersome, especially in terms of meshing. The quality of the mesh is particularly important when analyzing the tire's stress and other related characteristics, because poor quality meshes can easily lead to non-convergence of results after analysis, resulting in failures, and rework to adjust or re-divide the mesh. The above situation is very likely to occur when using the finite element analysis software's own automatic meshing method; if the mesh is divided manually, it is very time-consuming, which will take up most of the time for pre-processing of the finite element analysis.

[0004] According to the analysis experience, when analyzing the force characteristics of tires, it is best to ensure that the grid is mostly quadrilateral grid units (two-dimensional grids), because triangular grid units (two-dimensional grids) are constant stress and constant strain units with large unit stiffness. The presence of triangular grid units in key locations will lead to inaccurate results on the one hand, and make the analysis results difficult to converge on the other hand. The shoulder of the tire tread is such a location. This location is mostly the end of the belt layer, with large strain deflection, and it is easy to have delamination and bulging at the end of the belt layer. It is the focus of the finite element force characteristics analysis of tires. Therefore, try to reduce the appearance of triangular grid units in this location. However, for large and medium-sized tires, the contact shoulder line is mostly horizontal and nearly vertical lines forming a sharp angle, and the inner liner curve is a smooth curve, which makes the tire volume between the sidewall and the tread center larger. If meshing is performed, it is very easy to have triangular grid units at the largest volume. It is necessary to transfer the triangular grid units to non-important or small deformation locations. Human participation in the meshing and modification process will easily affect the overall simulation analysis efficiency, and may also affect the mood of the simulation personnel, which will further slow down the progress of the simulation analysis.

[0005] Therefore, it is necessary to develop a more convenient, faster and more effective method for automatic finite element meshing of the tread and shoulder of large and medium-sized tires to slow down or prevent the occurrence of the above situation.

[0006] The above information disclosed in the background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country for those skilled in the art. Summary of the invention

[0007] The main purpose of the present application is to provide a method, device, computer-readable storage medium, processor and tire simulation system for dividing a tire shoulder finite element grid, so as to solve the problem of poor simulation effect of the automatic division method of the tire tread shoulder finite element grid in the prior art.

[0008] According to one aspect of an embodiment of the present invention, a method for dividing a finite element mesh of a tire shoulder is provided, comprising: obtaining a distribution map of a shoulder area of ​​a tire, obtaining a region boundary line of the shoulder area, and sequentially connecting the intersection points of the region boundary lines to form a polygon; identifying a region in the shoulder area where stress is less than a stress threshold under any working condition to obtain a low stress region; segmenting a triangle in the polygon, wherein the triangle is located in the low stress region and at least two sides of the triangle are located on the sides of the polygon; dividing meshes in the remaining area of ​​the triangle and the polygon, respectively, to obtain a preliminary mesh; extending the preliminary mesh so that both ends of any grid line are located on the region boundary line to obtain a finite element mesh of the shoulder.

[0009] Optionally, segmenting a triangle in the polygon includes: obtaining the vertices of the polygon in the low stress area to obtain a first vertex; determining multiple segmentation points based on the area boundary line and the inter-layer boundary line of the shoulder, the segmentation points being the intersection points of any two of the area boundary lines and the inter-layer boundary lines of the shoulder; determining two segmentation points adjacent to the first vertex as the second vertex and the third vertex respectively; and connecting the first vertex, the second vertex and the third vertex in sequence to obtain the triangle.

[0010] Optionally, grids are divided in the remaining areas of the triangle and the polygon to obtain a preliminary grid, including: dividing the longest side of the triangle into equal parts to obtain a plurality of first dividing points; and drawing perpendicular lines from each of the first dividing points as a starting point to the other two sides to obtain part of the preliminary grid.

[0011] Optionally, meshing the remaining areas of the triangle and the polygon respectively to obtain a preliminary mesh includes: a segmentation step, dividing the remaining area of ​​the polygon into a plurality of quadrilateral areas according to the segmentation points other than the first vertex; a first equal division step, dividing a pair of opposite sides of the quadrilateral area equally, respectively, to obtain M second equal division points and M third equal division points, wherein the third equal division point and the second equal division point are located on different sides; a second equal division step, dividing another pair of opposite sides of the quadrilateral area equally, respectively, to obtain N fourth equal division points and N fifth equal division points , the fifth dividing point and the fourth dividing point are located on different edges; a connecting step, connecting the M third dividing points and the M second dividing points one by one to obtain a plurality of first grid lines, any two of which do not intersect, connecting the N fifth dividing points and the N fourth dividing points one by one to obtain a plurality of second grid lines, any two of which do not intersect; repeating the first dividing step, the second dividing step and the connecting step at least once in sequence until all the quadrilateral regions are divided into grids, and obtaining part of the preliminary grids.

[0012] Optionally, obtaining a distribution map of the shoulder area of ​​the tire to obtain a regional boundary line of the shoulder area includes: obtaining a cross-sectional view of the tire; dividing the cross-sectional view into a tread area, a sidewall area and a bead area; dividing the tread area into a tread smooth area and a shoulder area to obtain the regional boundary line of the shoulder area.

[0013] Optionally, the distance between two adjacent first equally divided points is 10 mm to 15 mm.

[0014] According to another aspect of an embodiment of the present invention, a device for dividing a finite element mesh of a tire shoulder is also provided, comprising: an acquisition unit, used to acquire a distribution map of a shoulder area of ​​a tire, obtain a region boundary line of the shoulder area, and sequentially connect the intersection points of the region boundary lines to form a polygon; an identification unit, used to identify a region in the shoulder area where stress is less than a stress threshold under any working condition to obtain a low stress region; a segmentation unit, used to segment a triangle in the polygon, wherein the triangle is located in the low stress region and at least two sides of the triangle are located on the sides of the polygon; a division unit, used to divide meshes in the remaining area of ​​the triangle and the polygon, respectively, to obtain a preliminary mesh; an extension unit, used to extend the preliminary mesh so that both ends of any grid line are located on the region boundary line to obtain a finite element mesh of the shoulder.

[0015] According to yet another aspect of the embodiments of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein the program executes any one of the methods described.

[0016] According to yet another aspect of an embodiment of the present invention, a processor is provided, wherein the processor is used to run a program, wherein any one of the methods is executed when the program is run.

[0017] According to another aspect of an embodiment of the present invention, a tire simulation system is also provided, comprising: one or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the methods described.

[0018] In an embodiment of the present invention, in the above-mentioned method for dividing the finite element mesh of the tire shoulder, first, obtain the distribution map of the tire shoulder area, obtain the regional boundary line of the above-mentioned shoulder area, and sequentially connect the intersection points of the above-mentioned regional boundary lines to form a polygon; then, identify the area in the above-mentioned shoulder area where the stress is less than the stress threshold under any working condition, and obtain the low stress area; then, divide a triangle in the above-mentioned polygon, the above-mentioned triangle is located in the above-mentioned low stress area and at least two sides of the above-mentioned triangle are located on the sides of the above-mentioned polygon; then, divide the mesh in the above-mentioned triangle and the remaining area of ​​the above-mentioned polygon respectively to obtain a preliminary mesh; finally, extend the above-mentioned preliminary mesh so that both ends of any grid line are located on the above-mentioned regional boundary line, and obtain the finite element mesh of the above-mentioned shoulder. The above-mentioned method divides the triangle in the low stress area so that the divided mesh triangle only appears in the low stress area, obtains a high-quality finite element mesh, makes the force analysis more accurate, and has a good simulation effect, solves the problem of poor simulation effect of the automatic division method of the finite element mesh of the tire tread shoulder in the prior art, thereby eliminating the need for manual division of the mesh and improving the efficiency of simulation analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A flow chart showing a method for dividing a tire shoulder finite element mesh according to an embodiment of the present application is shown;

[0021] Figure 2 is a schematic diagram of global partitioning of a material distribution map according to an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of a segmentation dot matrix of a tread shoulder region according to an embodiment of the present application;

[0023] Figure 4is a schematic diagram of segmentation lines in the tread shoulder region according to an embodiment of the present application;

[0024] Figure 5 is a schematic diagram of grid division of an actual tread shoulder area according to an embodiment of the present application;

[0025] Figure 6 A schematic diagram of a device for dividing a tire shoulder finite element grid according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0029] As mentioned in the background technology, the simulation effect of the automatic division method of the tire tread shoulder finite element mesh in the prior art is poor. In order to solve the above problem, in a typical embodiment of the present application, a method, device, computer-readable storage medium, processor and tire simulation system for dividing the tire shoulder finite element mesh are provided.

[0030] According to an embodiment of the present application, a method for dividing a tire shoulder finite element mesh is provided.

[0031] Figure 1 FIG. 1 is a flow chart of a method for dividing a tire shoulder finite element mesh according to an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0032] Step S101, obtaining a distribution map of the shoulder area of ​​the tire, obtaining the area boundary line of the shoulder area, and sequentially connecting the intersection points of the area boundary lines to form a polygon;

[0033] Step S102, identifying an area in the shoulder area where the stress is less than the stress threshold under any working condition, and obtaining a low stress area;

[0034] Step S103, dividing a triangle in the polygon, wherein the triangle is located in the low stress area and at least two sides of the triangle are located on the sides of the polygon;

[0035] Step S104, dividing the remaining areas of the triangle and the polygon into grids to obtain preliminary grids;

[0036] Step S105, extending the prepared grid so that both ends of any grid line are located on the area boundary line, thereby obtaining a finite element grid of the tire shoulder.

[0037] In the above-mentioned method for dividing the finite element mesh of the tire shoulder, first, obtain the distribution map of the tire shoulder area, obtain the regional boundary line of the above-mentioned shoulder area, and connect the intersection points of the above-mentioned regional boundary lines in sequence to form a polygon; then, identify the area in the above-mentioned shoulder area where the stress is less than the stress threshold under any working condition to obtain a low stress area; then, divide a triangle in the above-mentioned polygon, the above-mentioned triangle is located in the above-mentioned low stress area and at least two sides of the above-mentioned triangle are located on the sides of the above-mentioned polygon; then, divide the mesh in the above-mentioned triangle and the remaining area of ​​the above-mentioned polygon respectively to obtain a preliminary mesh; finally, extend the above-mentioned preliminary mesh so that both ends of any grid line are located on the above-mentioned regional boundary line to obtain the finite element mesh of the above-mentioned shoulder. The above-mentioned method divides the triangle in the low stress area so that the divided mesh triangle only appears in the low stress area, obtains a high-quality finite element mesh, makes the force analysis more accurate, and has a good simulation effect, solves the problem of poor simulation effect of the automatic division method of the finite element mesh of the tire tread shoulder in the prior art, thereby eliminating the need for manual division of the mesh and improving the efficiency of simulation analysis.

[0038] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0039] In one embodiment of the present application, obtaining a distribution map of a shoulder area of ​​a tire and obtaining a regional boundary line of the shoulder area includes: obtaining a cross-sectional view of the tire; dividing the cross-sectional view into a tread area, a sidewall area, and a bead area; dividing the tread area into a tread smooth area and a shoulder area, and obtaining the regional boundary line of the shoulder area. Specifically, Figure 2As shown, the cross-sectional view of the above tire is divided into A1 tread smooth area, A2 shoulder area, A3 sidewall area and A4 bead area, the boundary line LL3 between tread area A1 and shoulder area A2 is a perpendicular line drawn from the end point of 2# belt layer to the tread outer contour line LL1 and the inner liner contour line LL2 in sequence; the boundary line LL4 between shoulder area A2 and sidewall area A3 is a perpendicular line from the end point of tread to the inner liner contour line LL2; the surface area between the boundary line LL3 between tread smooth area A1 and shoulder area A2 and the boundary line LL4 between shoulder area A2 and sidewall area A3 is the shoulder area A2, and the part above the base rubber bottom end line LL5 is the shoulder area of ​​the tread area.

[0040] In one embodiment of the present application, segmenting a triangle in the polygon includes: obtaining the vertices of the polygon in the low stress area to obtain the first vertex; determining multiple segmentation points according to the area boundary line and the inter-layer boundary line of the shoulder, the segmentation points being the intersection points of any two of the area boundary line and the inter-layer boundary line of the shoulder; determining two segmentation points adjacent to the first vertex as the second vertex and the third vertex respectively; and sequentially connecting the first vertex, the second vertex and the third vertex to obtain the triangle. Specifically, as Figure 3 As shown, the priority points N1, N2, N3, N7, and N8 are identified, where point N1 is the end point of the base rubber, point N2 is the end point where the tread rubber and the base rubber are attached, N3 is the intersection point of the tread outer contour line LL1 and the sidewall outer contour line, N7 is the intersection point of the tread area A1 and the shoulder area A2 boundary line LL3 and the base rubber bottom end line LL5, and N8 is the end point where the belt layer glue is attached. Secondary points N4, N5, N6, N9, and N10 are generated, and a perpendicular line is drawn from point N8 to the tread outer contour line LL1, which intersects with the upper surface of the base rubber and the tread outer contour line LL1 in turn, and the boundary line LL3 between the tread area A1 and the shoulder area A2 generates the intersection points N10 and N4. They intersect with the upper surface of the base rubber and the outer contour line LL1 of the tread to generate intersection points N6 and N5 respectively; a perpendicular line is drawn from point N2 to the bottom end line LL5 of the base rubber, and its foot is point N9, to obtain a segmentation point matrix of N1-N10, N1 is the vertex of the above-mentioned polygon in the above-mentioned low stress area, that is, the first vertex, and the two segmentation points adjacent to the first vertex N1 are N2 and N9, that is, the second vertex and the third vertex, and the above-mentioned first vertex N1, the above-mentioned second vertex N2 and the above-mentioned third vertex N9 are connected in sequence to obtain the above-mentioned triangle, so that the above-mentioned triangle is basically located in the above-mentioned low stress area, so that the divided mesh triangles basically only appear in the low stress area.

[0041] In one embodiment of the present application, the remaining areas of the triangle and the polygon are divided into grids to obtain a preliminary grid, including: dividing the longest side of the triangle into equal parts to obtain a plurality of first equal division points; and drawing perpendicular lines from each of the first equal division points to the other two sides to obtain part of the preliminary grid. Specifically, Figure 3 As shown, the triangles where the above-mentioned preliminary mesh appears are near the longest side of the above-mentioned triangle, so that the above-mentioned triangles are concentrated near the edge of the above-mentioned low stress area, further improving the quality of the finite element mesh.

[0042] In one embodiment of the present application, meshes are divided in the remaining areas of the triangle and the polygon to obtain a preliminary mesh, including: a segmentation step, dividing the remaining area of ​​the polygon into a plurality of quadrilateral areas according to the segmentation points other than the first vertex; a first equal division step, dividing a pair of opposite sides of the quadrilateral area equally, to obtain M second equal division points and M third equal division points, the third equal division points and the second equal division points being located on different sides; a second equal division step, dividing another pair of opposite sides of the quadrilateral area equally, to obtain N fourth equal division points and N third equal division points. Five equally divided points, the fifth equally divided point and the fourth equally divided point are located on different sides; the line connection step, connect the M third equally divided points and the M second equally divided points one by one to obtain a plurality of first grid lines, any two of the first grid lines do not intersect, connect the N fifth equally divided points and the N fourth equally divided points one by one to obtain a plurality of second grid lines, any two of the second grid lines do not intersect; repeat the first equally divided step, the second equally divided step and the line connection step at least once in sequence until all the quadrilateral regions are divided into grids, and obtain part of the above-mentioned preliminary grids. Specifically, as Figure 4 As shown, a quadrilateral region is formed by points N2, N3, N4, and N10. The line segment between points N2 and N10 is L8. L8 is used as a reference for segmentation processing to generate N points such as L81, L82, ..., L8n. The side opposite to L8 is L3, and the number of its segments is the same as that of L8. The other two sides L2 and L7 are segmented based on L7, and the number of segments is the same. Similarly, the quadrilateral region formed by points N4, N5, N6, and N10 is segmented, and the line segment L9 between points N10 and N6 and the line segment L7 between points N4 and N10 are used as references for segmentation processing, and the sides opposite to L9 and L7 are segmented accordingly. Processing; segment the surface area formed by the points N6, N7, N8, and N10, and perform segmentation processing based on the line segment L9 between the points N10 and N6 and the line segment L12 between the points N8 and N10, respectively, and perform corresponding segmentation processing on the edges opposite to L9 and L12; segment the surface area formed by the points N8, N9, N2, and N10, and perform segmentation processing based on the line segment L12 between the points N10 and N8 and the line segment L8 between the points N2 and N10, respectively, and perform corresponding segmentation processing on the edges opposite to L8 and L12. After the four quadrilateral areas are segmented, the equally divided points are connected one by one to generate part of the above-mentioned preliminary grid.

[0043] It should be noted that if Figure 5As shown, the above-mentioned prepared grid is extended so that both ends of any grid line are located on the above-mentioned area boundary line, thereby obtaining the finite element grid of the above-mentioned shoulder.

[0044] In one embodiment of the present application, the distance between two adjacent first equally divided points is 10 mm to 15 mm. Specifically, for all the equally divided points, the distance between two adjacent equally divided points is 10 mm to 15 mm, so that the force analysis of the finite element mesh is more accurate and the mesh quality is higher.

[0045] The embodiment of the present application also provides a device for dividing a finite element mesh of a tire shoulder. It should be noted that the device for dividing a finite element mesh of a tire shoulder in the embodiment of the present application can be used to execute the method for dividing a finite element mesh of a tire shoulder provided in the embodiment of the present application. The device for dividing a finite element mesh of a tire shoulder provided in the embodiment of the present application is introduced below.

[0046] Figure 6 Schematic diagram of a device for dividing a tire shoulder finite element grid according to an embodiment of the present application. Figure 6 As shown, the device comprises:

[0047] The acquisition unit 10 is used to acquire a distribution map of the shoulder area of ​​the tire, obtain the area boundary line of the shoulder area, and sequentially connect the intersection points of the area boundary lines to form a polygon;

[0048] An identification unit 20 is used to identify a region in the shoulder region where the stress is less than a stress threshold under any working condition, and obtain a low stress region;

[0049] A segmentation unit 30, configured to segment a triangle in the polygon, wherein the triangle is located in the low stress region and at least two sides of the triangle are located on sides of the polygon;

[0050] A division unit 40 is used to divide the remaining areas of the triangle and the polygon into grids to obtain preliminary grids;

[0051] The extension unit 50 is used to extend the above-mentioned prepared grid so that both ends of any grid line are located on the above-mentioned area boundary line, thereby obtaining the finite element grid of the above-mentioned shoulder.

[0052] In the above-mentioned tire shoulder finite element mesh division device, the acquisition unit acquires the distribution map of the tire shoulder area, obtains the area boundary line of the above-mentioned shoulder area, and sequentially connects the intersection points of the above-mentioned area boundary lines to form a polygon; the identification unit identifies the area in the above-mentioned shoulder area where the stress is less than the stress threshold under any working condition to obtain a low stress area; the segmentation unit segments a triangle in the above-mentioned polygon, the above-mentioned triangle is located in the above-mentioned low stress area and at least two sides of the above-mentioned triangle are located on the sides of the above-mentioned polygon; the division unit divides the mesh in the above-mentioned triangle and the remaining area of ​​the above-mentioned polygon respectively to obtain a preliminary mesh; the extension unit extends the above-mentioned preliminary mesh so that both ends of any grid line are located on the above-mentioned area boundary line to obtain the finite element mesh of the above-mentioned shoulder. The above-mentioned device divides the triangle in the low stress area so that the divided mesh triangle only appears in the low stress area, obtains a high-quality finite element mesh, makes the force analysis more accurate, and has a good simulation effect, solves the problem of poor simulation effect of the tire tread shoulder finite element mesh automatic division method in the prior art, thereby eliminating the need for manual mesh division and improving the efficiency of simulation analysis.

[0053] In one embodiment of the present application, the acquisition unit includes a first acquisition module and a division module, wherein the first acquisition module is used to acquire a cross-sectional view of the tire; divide the cross-sectional view into a tread area, a sidewall area, and a bead area; and the division module is used to divide the tread area into a tread smooth area and a shoulder area, and obtain the area boundary of the shoulder area. Specifically, Figure 2 As shown, the cross-sectional view of the above tire is divided into A1 tread smooth area, A2 shoulder area, A3 sidewall area and A4 bead area, the boundary line LL3 between tread area A1 and shoulder area A2 is a perpendicular line drawn from the end point of 2# belt layer to the tread outer contour line LL1 and the inner liner contour line LL2 in sequence; the boundary line LL4 between shoulder area A2 and sidewall area A3 is a perpendicular line from the end point of tread to the inner liner contour line LL2; the surface area between the boundary line LL3 between tread smooth area A1 and shoulder area A2 and the boundary line LL4 between shoulder area A2 and sidewall area A3 is the shoulder area A2, and the part above the base rubber bottom end line LL5 is the shoulder area of ​​the tread area.

[0054] In one embodiment of the present application, the segmentation unit includes a first acquisition module, a first determination module, a second determination module and a connection module, wherein the first acquisition module is used to acquire the vertices of the polygon in the low stress area to obtain the first vertex; the first determination module is used to determine a plurality of segmentation points according to the area boundary line and the inter-layer boundary line of the shoulder, and the segmentation points are the intersection points of any two of the area boundary line and the inter-layer boundary line of the shoulder; the second determination module is used to determine the two adjacent segmentation points of the first vertex as the second vertex and the third vertex respectively; the connection module is used to sequentially connect the first vertex, the second vertex and the third vertex to obtain the triangle. Specifically, as Figure 3 As shown, the priority points N1, N2, N3, N7, and N8 are identified, where point N1 is the end point of the base rubber, point N2 is the end point where the tread rubber and the base rubber are attached, N3 is the intersection point of the tread outer contour line LL1 and the sidewall outer contour line, N7 is the intersection point of the tread area A1 and the shoulder area A2 boundary line LL3 and the base rubber bottom end line LL5, and N8 is the end point where the belt layer glue is attached. Secondary points N4, N5, N6, N9, and N10 are generated, and a perpendicular line is drawn from point N8 to the tread outer contour line LL1, which intersects with the upper surface of the base rubber and the tread outer contour line LL1 in turn, and the boundary line LL3 between the tread area A1 and the shoulder area A2 generates the intersection points N10 and N4. They intersect with the upper surface of the base rubber and the outer contour line LL1 of the tread to generate intersection points N6 and N5 respectively; a perpendicular line is drawn from point N2 to the bottom end line LL5 of the base rubber, and its foot is point N9, to obtain a segmentation point matrix of N1-N10, N1 is the vertex of the above-mentioned polygon in the above-mentioned low stress area, that is, the first vertex, and the two segmentation points adjacent to the first vertex N1 are N2 and N9, that is, the second vertex and the third vertex, and the above-mentioned first vertex N1, the above-mentioned second vertex N2 and the above-mentioned third vertex N9 are connected in sequence to obtain the above-mentioned triangle, so that the above-mentioned triangle is basically located in the above-mentioned low stress area, so that the divided mesh triangles basically only appear in the low stress area.

[0055] In one embodiment of the present application, the division unit includes a first processing module and a second processing module, wherein the first processing module is used to divide the longest side of the triangle into equal parts to obtain a plurality of first equal division points; the second processing module is used to draw perpendicular lines from each of the first equal division points to the other two sides to obtain part of the preliminary grid. Specifically, Figure 3 As shown, the triangles where the above-mentioned preliminary mesh appears are near the longest side of the above-mentioned triangle, so that the above-mentioned triangles are concentrated near the edge of the above-mentioned low stress area, further improving the quality of the finite element mesh.

[0056] In one embodiment of the present application, the division unit further includes a segmentation module, a first equal division module, a second equal division module, a connection module and a repetition module, wherein the segmentation module is used to execute the segmentation step, and divide the remaining area of ​​the polygon into a plurality of quadrilateral areas according to the segmentation points other than the first vertex; the first equal division module is used to execute the first equal division step, and divide a pair of opposite sides of the quadrilateral area into equal parts, respectively, to obtain M second equal division points and M third equal division points, and the third equal division point and the second equal division point are located on different sides; the second equal division module is used to execute the second equal division step, and divide another pair of opposite sides of the quadrilateral area into equal parts, respectively, to obtain N The fourth dividing point and the fifth dividing point are N, and the fifth dividing point and the fourth dividing point are located on different sides; the connection module is used to execute the connection step, connect the M third dividing points and the M second dividing points one by one, and obtain a plurality of first grid lines, and any two of the first grid lines do not intersect, and connect the N fifth dividing points and the N fourth dividing points one by one, and obtain a plurality of second grid lines, and any two of the second grid lines do not intersect; the repetition module is used to execute the first dividing step, the second dividing step and the connection step at least once in sequence, until all the quadrilateral regions are divided into grids, and part of the preliminary grids are obtained. Specifically, Figure 4 As shown, a quadrilateral region is formed by points N2, N3, N4, and N10. The line segment between points N2 and N10 is L8. L8 is used as a reference for segmentation processing to generate N points such as L81, L82, ..., L8n. The side opposite to L8 is L3, and the number of its segments is the same as that of L8. The other two sides L2 and L7 are segmented based on L7, and the number of segments is the same. Similarly, the quadrilateral region formed by points N4, N5, N6, and N10 is segmented, and the line segment L9 between points N10 and N6 and the line segment L7 between points N4 and N10 are used as references for segmentation processing, and the sides opposite to L9 and L7 are segmented accordingly. Processing; segment the surface area formed by the points N6, N7, N8, and N10, and perform segmentation processing based on the line segment L9 between the points N10 and N6 and the line segment L12 between the points N8 and N10, respectively, and perform corresponding segmentation processing on the edges opposite to L9 and L12; segment the surface area formed by the points N8, N9, N2, and N10, and perform segmentation processing based on the line segment L12 between the points N10 and N8 and the line segment L8 between the points N2 and N10, respectively, and perform corresponding segmentation processing on the edges opposite to L8 and L12. After the four quadrilateral areas are segmented, the equally divided points are connected one by one to generate part of the above-mentioned preliminary grid.

[0057] It should be noted that if Figure 5 As shown, the above-mentioned prepared grid is extended so that both ends of any grid line are located on the above-mentioned area boundary line, thereby obtaining the finite element grid of the above-mentioned shoulder.

[0058] In one embodiment of the present application, the distance between two adjacent first equally divided points is 10 mm to 15 mm. Specifically, for all the equally divided points, the distance between two adjacent equally divided points is 10 mm to 15 mm, so that the force analysis of the finite element mesh is more accurate and the mesh quality is higher.

[0059] The above-mentioned tire shoulder finite element grid division device includes a processor and a memory. The above-mentioned acquisition unit, identification unit, segmentation unit, division unit and extension unit are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0060] The processor includes a kernel, and the kernel retrieves the corresponding program unit from the memory. One or more kernels can be provided, and the problem of poor simulation effect of the tire tread shoulder finite element mesh automatic division method in the prior art is solved by adjusting kernel parameters.

[0061] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0062] An embodiment of the present invention provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the above method is implemented.

[0063] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the method is executed when the program is run.

[0064] An embodiment of the present invention provides a tire simulation system, the device includes a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0065] Step S101, obtaining a distribution map of the shoulder area of ​​the tire, obtaining the area boundary line of the shoulder area, and sequentially connecting the intersection points of the area boundary lines to form a polygon;

[0066] Step S102, identifying an area in the shoulder area where the stress is less than the stress threshold under any working condition, and obtaining a low stress area;

[0067] Step S103, dividing a triangle in the polygon, wherein the triangle is located in the low stress area and at least two sides of the triangle are located on the sides of the polygon;

[0068] Step S104, dividing the remaining areas of the triangle and the polygon into grids to obtain preliminary grids;

[0069] Step S105, extending the prepared grid so that both ends of any grid line are located on the area boundary line, thereby obtaining a finite element grid of the tire shoulder.

[0070] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0071] Step S101, obtaining a distribution map of the shoulder area of ​​the tire, obtaining the area boundary line of the shoulder area, and sequentially connecting the intersection points of the area boundary lines to form a polygon;

[0072] Step S102, identifying an area in the shoulder area where the stress is less than the stress threshold under any working condition, and obtaining a low stress area;

[0073] Step S103, dividing a triangle in the polygon, wherein the triangle is located in the low stress area and at least two sides of the triangle are located on the sides of the polygon;

[0074] Step S104, dividing the remaining areas of the triangle and the polygon into grids to obtain preliminary grids;

[0075] Step S105, extending the prepared grid so that both ends of any grid line are located on the area boundary line, thereby obtaining a finite element grid of the tire shoulder.

[0076] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0077] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the above-mentioned units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0078] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0079] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0080] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a computer-readable storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present invention. The aforementioned computer-readable storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0081] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0082] 1) In the method for dividing the finite element mesh of the tire shoulder of the present application, first, obtain the distribution map of the tire shoulder area, obtain the regional boundary line of the above-mentioned shoulder area, and connect the intersection points of the above-mentioned regional boundary lines in sequence to form a polygon; then, identify the area in the above-mentioned shoulder area where the stress is less than the stress threshold under any working condition to obtain a low stress area; then, divide a triangle in the above-mentioned polygon, the above-mentioned triangle is located in the above-mentioned low stress area and at least two sides of the above-mentioned triangle are located on the sides of the above-mentioned polygon; then, divide the mesh in the above-mentioned triangle and the remaining area of ​​the above-mentioned polygon respectively to obtain a preliminary mesh; finally, extend the above-mentioned preliminary mesh so that both ends of any grid line are located on the above-mentioned regional boundary line to obtain the finite element mesh of the above-mentioned shoulder. The above-mentioned method divides the triangle in the low stress area so that the divided mesh triangle only appears in the low stress area, obtains a high-quality finite element mesh, makes the force analysis more accurate, and has a good simulation effect, solves the problem of poor simulation effect of the automatic division method of the finite element mesh of the tire tread shoulder in the prior art, thereby eliminating the need for manual division of the mesh and improving the efficiency of simulation analysis.

[0083] 2) In the finite element mesh division device of the tire shoulder of the present application, the acquisition unit acquires the distribution map of the shoulder area of ​​the tire, obtains the regional boundary line of the shoulder area, and sequentially connects the intersection points of the regional boundary lines to form a polygon; the identification unit identifies the area in the shoulder area where the stress is less than the stress threshold under any working condition to obtain a low stress area; the segmentation unit segments a triangle in the polygon, the triangle is located in the low stress area and at least two sides of the triangle are located on the sides of the polygon; the segmentation unit divides the grid in the triangle and the remaining area of ​​the polygon respectively to obtain a preliminary grid; the extension unit extends the preliminary grid so that both ends of any grid line are located on the regional boundary line to obtain the finite element grid of the shoulder. The above device divides the triangle in the low stress area so that the divided grid triangle only appears in the low stress area, and obtains a high-quality finite element grid, so that the force analysis is more accurate and the simulation effect is good, which solves the problem of poor simulation effect of the automatic finite element mesh division method of the tire tread shoulder in the prior art, thereby eliminating the need for manual grid division and improving the efficiency of simulation analysis.

[0084] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for dividing tire shoulder finite element mesh, It is characterized in that include: Obtaining a distribution map of a shoulder area of ​​the tire, obtaining a region boundary line of the shoulder area, and sequentially connecting intersection points of the region boundary lines to form a polygon; Identify an area in the shoulder region where stress is less than a stress threshold under any working condition to obtain a low stress area; Acquire the vertices of the polygon in the low stress area to obtain a first vertex; determine a plurality of segmentation points according to the area boundary line and the inter-layer boundary line of the shoulder, wherein the segmentation points are intersection points of any two of the area boundary line and the inter-layer boundary line of the shoulder; Determine two adjacent segmentation points of the first vertex as a second vertex and a third vertex respectively; connect the first vertex, the second vertex and the third vertex in sequence to obtain a triangle; the triangle is located in the low stress area and at least two sides of the triangle are located on the sides of the polygon; The longest side of the triangle is divided equally to obtain a plurality of first dividing points; and perpendicular lines are drawn from each of the first dividing points to the other two sides to obtain a partial preliminary grid; a segmentation step, dividing the remaining area of ​​the polygon into a plurality of quadrilateral areas according to the segmentation points other than the first vertex; A first dividing step, dividing a pair of opposite sides of the quadrilateral area into equal parts respectively, to obtain M second dividing points and M third dividing points, wherein the third dividing points and the second dividing points are located on different sides; A second dividing step, dividing the other pair of opposite sides of the quadrilateral area equally respectively, to obtain N fourth dividing points and N fifth dividing points, wherein the fifth dividing point and the fourth dividing point are located on different sides; a line connecting step, connecting the M third dividing points and the M second dividing points one by one to obtain a plurality of first grid lines, wherein any two of the first grid lines do not intersect, and connecting the N fifth dividing points and the N fourth dividing points one by one to obtain a plurality of second grid lines, wherein any two of the second grid lines do not intersect; and repeating the first dividing step, the second dividing step and the line connecting step at least once in sequence, until all the quadrilateral areas are divided into grids, to obtain part of the preliminary grids; The prepared grid is extended so that both ends of any grid line are located on the region boundary line, thereby obtaining a finite element grid of the tire shoulder.

2. The method according to claim 1, It is characterized in that Obtaining a distribution map of a tire shoulder area and obtaining a region boundary line of the tire shoulder area includes: Obtaining a cross-sectional view of the tire; Dividing the cross-sectional view into a tread region, a sidewall region, and a bead region; The tread area is divided into a tread smooth area and a shoulder area, and the area boundary line of the shoulder area is obtained.

3. The method according to claim 1, It is characterized in that The distance between two adjacent first equally divided points is 10 mm to 15 mm.

4. A device for dividing tire shoulder finite element grids, It is characterized in that include: An acquisition unit, used to acquire a distribution map of a shoulder area of ​​the tire, obtain a region boundary line of the shoulder area, and sequentially connect intersection points of the region boundary lines to form a polygon; An identification unit, used for identifying an area in the shoulder area where the stress is less than a stress threshold under any working condition, to obtain a low stress area; A segmentation unit, the segmentation unit includes a first acquisition module, a first determination module, a second determination module and a connection module, wherein the first acquisition module is used to obtain the vertices of the polygon in the low stress area to obtain a first vertex; the first determination module is used to determine a plurality of segmentation points according to the area boundary line and the inter-layer boundary line of the shoulder, and the segmentation point is the intersection of any two of the area boundary line and the inter-layer boundary line of the shoulder; the second determination module is used to determine two segmentation points adjacent to the first vertex as a second vertex and a third vertex respectively; the connection module is used to sequentially connect the first vertex, the second vertex and the third vertex to obtain a triangle; the triangle is located in the low stress area and at least two sides of the triangle are located on the sides of the polygon; A division unit, the division unit includes a first processing module and a second processing module, wherein the first processing module is used to divide the longest side of the triangle into equal parts to obtain a plurality of first division points; the second processing module is used to draw perpendicular lines to the other two sides from each of the first division points as a starting point to obtain a partial preliminary grid; the division unit also includes a segmentation module, a first division module, a second division module, a connection module and a repeating module, wherein the segmentation module is used to execute the segmentation step to divide the remaining area of ​​the polygon into a plurality of quadrilateral areas according to the division points other than the first vertex; the first division module is used to execute the first division step to divide a pair of opposite sides of the quadrilateral area into equal parts to obtain M second division points and M third division points, wherein the third division points and the second division points are located at different The second dividing module is used to execute the second dividing step, and the other pair of opposite sides of the quadrilateral area are divided equally respectively to obtain N fourth dividing points and N fifth dividing points, and the fifth dividing points and the fourth dividing points are located on different sides; the line connecting module is used to execute the line connecting step, and the M third dividing points and the M second dividing points are connected one by one to obtain a plurality of first grid lines, and any two of the first grid lines do not intersect, and the N fifth dividing points and the N fourth dividing points are connected one by one to obtain a plurality of second grid lines, and any two of the second grid lines do not intersect; the repetition module is used to execute the first dividing step, the second dividing step and the line connecting step in sequence at least once, until all the quadrilateral areas are divided into grids, and part of the preliminary grids are obtained; The extending unit is used to extend the prepared grid so that both ends of any grid line are located on the area boundary line, thereby obtaining the finite element grid of the tire shoulder.

5. A computer-readable storage medium, It is characterized in that The computer-readable storage medium includes a stored program, wherein the program executes the method of any one of claims 1 to 3.

6. A processor, It is characterized in that The processor is used to run a program, wherein the program executes the method according to any one of claims 1 to 3 when running.

7. A tire simulation system, It is characterized in that include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 3.

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