A self-programming-based modeling method for complex pattern variable pitch of a tire

Abstract

The application discloses a kind of complex pattern variable pitch modeling method of tire based on self-programming, including according to tire two-dimensional pattern design drawing to construct single pitch two-dimensional pattern geometric model, and according to tire material distribution map, the upper and lower contour boundary line of tire tread pattern is obtained, and format file is formed;According to the format file obtained as input file is imported into self-programming module for processing, the two-dimensional grid of pattern is generated, and the pattern characteristics are added simultaneously by self-programming module;According to the rib pitch design information of each rib of tread pattern separated by circumferential pattern groove, the corresponding pitch file is edited and imported;Whole variable pitch pattern modeling is carried out in self-programming module and is exported.The application realizes the hexahedron grid modeling of tread pattern by self-programming module, and realizes pattern variable pitch modeling by reading customized pitch file on this basis.

Description

Technical Field

[0001] This invention relates to the field of tire technology, and in particular to a method for modeling complex tire tread patterns and variable pitch based on a self-developed program. Background Technology

[0002] Tires are a crucial component of automobiles and a key part directly affecting various driving performance aspects. As the only part of the car in contact with the ground, tires not only absorb vibrations from road impacts but also provide forward driving force and lateral force for cornering. The complex tread pattern arrangement also affects the vehicle's noise characteristics and the tire's grip on wet roads, demonstrating the significant impact of tread pattern on tire performance. Due to the complex and diverse nature of tire tread patterns and the nonlinear characteristics of tire rubber, modeling and simulating tires with complex tread patterns is quite challenging. Current mainstream finite element modeling methods for complex tire tread patterns simplify the tread pattern to a constant pitch or even model the tread portion using tetrahedral meshes. However, these methods cannot meet the requirements of special simulation conditions such as noise, hydroplaning, and wear. Due to the hyperelastic properties of rubber materials, hexahedral meshes converge more easily than tetrahedral meshes. Furthermore, when both are the same size, hexahedral meshes offer significantly higher computational efficiency and simulation accuracy than tetrahedral meshes.

[0003] The shortcomings of existing technologies lie in the fact that the current mainstream finite element modeling methods for complex tire tread patterns simplify the tire tread pattern to a constant pitch or even model the tread portion using tetrahedral meshes. These methods cannot meet the requirements of special simulation conditions such as noise, hydroplaning, and wear. Due to the hyperelastic properties of rubber materials, hexahedral meshes converge more easily than tetrahedral meshes. Furthermore, when both have the same size, the computational efficiency and simulation accuracy of hexahedral meshes are significantly higher than those of tetrahedral meshes. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology. To achieve the above objective, a tire complex tread pattern variable pitch modeling method based on a self-written program is adopted to solve the problems mentioned in the background technology.

[0005] A method for modeling complex tire tread patterns with variable pitch based on a self-developed program, comprising the following steps:

[0006] Step S1: Construct a single-section two-dimensional tread geometric model based on the tire two-dimensional tread design drawing, and obtain the upper and lower contour boundary lines of the tire tread pattern based on the tire material distribution diagram, forming a format file;

[0007] Step S2: Import the obtained format file as input file into the self-written program module for processing to generate a two-dimensional mesh of the pattern, and at the same time add pattern features through the self-written program module.

[0008] Step S3: Edit and import the corresponding segment design information based on the segment design information of each rib separated by the circumferential tread grooves in the tread pattern;

[0009] Step S4: Model and output the integer variable pitch pattern in the self-written program module.

[0010] As a further aspect of the present invention: the specific steps in step S1 of constructing a single-section two-dimensional tread geometric model based on the tire two-dimensional tread design drawing include:

[0011] In 2D CAD design software, the middle tread block of the tire 2D tread pattern design drawing is selected for simplification and geometric cleanup. Finally, the 2D tread pattern design drawing is simplified into a 2D tread pattern geometric model that retains only a single pitch.

[0012] Move the leftmost edge of the pattern centerline to the origin of the coordinate system in the 2D CAD design software. After processing, save it as a dxf file as the input file for the self-written program module.

[0013] As a further aspect of the present invention: the specific steps for obtaining the upper and lower contour boundary lines of the tire tread pattern based on the tire material distribution map in step S1 include:

[0014] The upper and lower contour boundary lines are obtained from the tire material distribution map. The upper contour boundary line is the outer contour line of the tire from the center of the tread to the boundary of the tread design width. The lower contour boundary line is formed by connecting the projection lines of the bottom of the tire circumferential tread grooves and the bottom of the lateral grooves on the material distribution map or the outer boundary of the cord layer at the tire shoulder.

[0015] In 2D CAD design software, the leftmost position of the upper contour boundary line is set to 0 in the x-axis and equal to the tire's outer contour radius R in the y-axis. This allows the finite element model of the tire's complex 3D tread pattern to accurately match and fit with the remaining main body. After processing, it is saved as a dxf file as the input file for the self-written program module.

[0016] As a further aspect of the present invention, the specific steps in step S2 include:

[0017] Based on the obtained format file, the contour is mirrored according to the established rules by the self-written program module to obtain the complete upper and lower contour boundary lines in the tire section direction. Then, with the y-axis as the rotation axis, the virtual upper and lower rotating surface information is obtained.

[0018] The self-written program module identifies each RIB inside a single pattern by judging the number and position of the circumferential pattern grooves, and numbers the RIBs in ascending order along the y-axis. Then, it adjusts the numbers as needed. After the overall mesh size is determined, the local mesh nodes are edited by dragging, and finally a two-dimensional mesh of the pattern is generated. The mesh is required to be all planar quadrilateral elements, and the generated three-dimensional mesh is all hexahedral elements.

[0019] Meanwhile, pattern features can be set manually in the two-dimensional pattern setting interface of the self-written program module.

[0020] As a further aspect of the present invention, the specific steps in step S3 include:

[0021] The self-written program module imports section arrangement files multiple times. Based on the section arrangement design information of each RIB in the pattern, it edits and imports the corresponding section arrangement files. All section arrangement files are stored in the program for later use. The program settings function selects the section arrangement file corresponding to each RIB to complete the reading and matching of section arrangement information.

[0022] Compared with the prior art, the present invention has the following technical advantages:

[0023] The above technical solution uses a self-developed program module to model the tire tread pattern using a hexahedral mesh. Based on this, it reads a customized pitch file to model the tread pattern with variable pitch, thus quickly realizing a finite element modeling method for complex tire tread patterns, especially those with variable pitch characteristics. This effectively improves the efficiency of complex tread pattern modeling and achieves accurate simulation of special working conditions through highly accurate modeling of the tread pitch characteristics. Attached Figure Description

[0024] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the modeling method according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of a two-dimensional pattern style according to an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the upper and lower contours of a tire according to an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of a two-dimensional patterned mesh according to an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the section layout file according to an embodiment of this application;

[0030] Figure 6This is a schematic diagram of RIB section information matching according to an embodiment of this application;

[0031] Figure 7 This is a schematic diagram of a complex RIB variable pitch pattern according to an embodiment of this application.

[0032] Figure 8 This is a schematic diagram of a conventional variable pitch complex pattern according to an embodiment of this application. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Terminology Explanation:

[0035] Pitch: refers to the length of a complete tread pattern cycle along the centerline of the tire tread. Tire tread patterns are divided into constant pitch and variable pitch; high-speed passenger car tires almost always use variable pitch tread patterns.

[0036] Pitch arrangement: refers to the sequence of pitch arrangement of the tire tread pattern around its entire circumference;

[0037] Tread pitch file: An optional input file for custom programs, with the extension .seq. It contains parameters such as tire circumference and tread pitch arrangement.

[0038] RIB: refers to the ribs in the tire tread that are separated by circumferential tread grooves;

[0039] Conventional variable pitch: refers to tire tread where all RIBs within a single tread section have equal pitch and the same tread pattern rows;

[0040] RIB variable pitch: refers to the fact that each RIB in the tread pattern is relatively independent, with different tread pattern rows and pitches.

[0041] Please refer to Figure 1 In this embodiment of the invention, a method for modeling complex tire tread patterns with variable pitch based on a self-developed program includes the following steps:

[0042] Step S1: Construct a single-section two-dimensional tread geometric model based on the tire two-dimensional tread design drawing, and obtain the upper and lower contour boundary lines of the tire tread pattern based on the tire material distribution diagram, forming a format file;

[0043] In a specific implementation, the steps in step S1 of constructing a single-segment two-dimensional tread geometric model based on the tire two-dimensional tread design drawing include:

[0044] In 2D CAD design software, the middle tread block of the tire 2D tread pattern design drawing is selected for simplification and geometric cleanup. Finally, the 2D tread pattern design drawing is simplified into a 2D tread pattern geometric model that retains only a single pitch.

[0045] Move the leftmost edge of the pattern centerline to the origin of the coordinate system in the 2D CAD design software. After processing, save it as a dxf file as the input file for the self-written program module.

[0046] In a specific implementation, the steps in step S1 of obtaining the upper and lower contour boundaries of the tire tread pattern based on the tire material distribution map include:

[0047] The upper and lower contour boundary lines are obtained from the tire material distribution map. The upper contour boundary line is the outer contour line of the tire from the center of the tread to the boundary of the tread design width. The lower contour boundary line is formed by connecting the projection lines of the bottom of the tire circumferential tread grooves and the bottom of the lateral grooves on the material distribution map or the outer boundary of the cord layer at the tire shoulder.

[0048] In 2D CAD design software, the leftmost position of the upper contour boundary line is set to 0 in the x-axis and equal to the tire's outer contour radius R in the y-axis. This allows the finite element model of the tire's complex 3D tread pattern to accurately match and fit with the remaining main body. After processing, it is saved as a dxf file as the input file for the self-written program module.

[0049] Step S2: Import the obtained format file as input into the self-written program module for processing to generate a two-dimensional mesh of the pattern. Simultaneously, the self-written program module adds pattern features. Specific steps include:

[0050] Based on the obtained format file, the contour is mirrored according to the established rules by the self-written program module to obtain the complete upper and lower contour boundary lines in the tire section direction. Then, with the y-axis as the rotation axis, the virtual upper and lower rotating surface information is obtained.

[0051] The self-written program module identifies each RIB inside a single pattern by judging the number and position of the circumferential pattern grooves, and numbers the RIBs in ascending order along the y-axis. Then, it adjusts the numbers as needed. After the overall mesh size is determined, the local mesh nodes are edited by dragging, and finally a two-dimensional mesh of the pattern is generated. The mesh is required to be all planar quadrilateral elements, and the generated three-dimensional mesh is all hexahedral elements.

[0052] Meanwhile, pattern features can be set manually in the two-dimensional pattern setting interface of the self-written program module.

[0053] Step S3: Edit and import the corresponding rib arrangement file based on the rib arrangement design information of each rib separated by the circumferential tread grooves in the tread pattern. Specific steps include:

[0054] The self-written program module imports section arrangement files multiple times. Based on the section arrangement design information of each RIB in the pattern, it edits and imports the corresponding section arrangement files. All section arrangement files are stored in the program for later use. The program settings function selects the section arrangement file corresponding to each RIB to complete the reading and matching of section arrangement information.

[0055] Step S4: Model and output the integer variable pitch pattern in the self-written program module.

[0056] Example:

[0057] The present invention will be described in detail below with reference to the accompanying drawings and the 205 / 55R16 GitiSynergy E1 pattern.

[0058] The specific steps of the embodiment are as follows:

[0059] Stp1, Obtain the geometric model of a single-section 2D pattern:

[0060] In the 2D CAD design software, section A of the pattern design is simplified and geometrically cleaned up, ultimately reducing the 2D pattern design to a geometric model retaining only a single pitch. For easier positioning, the leftmost edge of the pattern's centerline is moved to the origin (0,0) of the software coordinate system. The final 2D pattern style is as follows: Figure 2 As shown. After processing, save it as a .dxf file as the input file for your custom program;

[0061] Stp2, Obtain the upper and lower contour boundaries of the tire tread pattern (collectively referred to as contour lines):

[0062] Both the upper and lower contour boundaries are obtained using tire material distribution maps. The upper contour boundary is taken as the outer contour line from the center of the tire tread to the boundary of the tread design width. The lower contour boundary line is generally formed by connecting the projection lines of the bottom of the circumferential tread grooves and the bottom of the lateral grooves on the material distribution map, or the outer boundary of the cord layer at the tire shoulder. It is necessary to ensure that the outer endpoint of the lower contour boundary line is 1mm perpendicularly to the boundary point of the tread design width. The outer diameter of this tire specification is 629mm. In 2D CAD software, the leftmost endpoint of the upper contour boundary line is moved to coordinates (0, 314.5) to ensure that the finite element model of the tire's complex 3D tread pattern can accurately match and fit with the remaining main body. The upper and lower contours of the tire are as follows: Figure 3 As shown. After processing, save it as a .dxf file as the input file for your custom program;

[0063] Stp3: Import the above single-section pattern and outline file as input into the self-written program:

[0064] The program mirrors the contour according to predetermined rules to obtain the complete upper and lower contour boundaries in the tire cross-section direction. Then, using the y-axis as the rotation axis, it obtains virtual upper and lower revolution surface information. The program identifies each RIB within a single tread pattern by judging the number and position of the circumferential grooves, and numbers the RIBs in ascending order along the y-axis. This tread pattern has 5 RIBs, named RIB1, RIB2, RIB3, RIB4, and RIB5. The program's default mesh size is 4mm, but the actual mesh size can be adjusted as needed. After the overall mesh size is determined, local mesh nodes are edited by dragging to finally generate the 2D mesh of the pattern. The mesh requires all elements to be planar quadrilaterals to ensure that the generated 3D mesh consists of hexahedral elements. The mesh node information of each RIB is stored independently according to its number. At this point, there are no associated constraints between the RIBs. The program can be used to set independent RIB rows for each RIB, allowing for free scaling of the RIB pitch. To ensure precise splicing of the tire's circumferential mesh, the mesh density along the leading and trailing edges of the tread pitch must be strictly equal; the generated two-dimensional tread mesh, such as... Figure 4 As shown.

[0065] Stp4. In the custom program's 2D tread pattern settings interface, the tire circumferential tread grooves are generally set to cut through by default:

[0066] Other features can be set manually, such as the circumferential groove wall angle, transverse groove depth, and transverse groove wall angle. After setting, the local mesh can be adjusted according to simulation needs.

[0067] Stp5, Import section layout file, Define pattern section layout:

[0068] In the tread pattern file, the keyword *PERIMETER corresponds to the tire's outer circumference of 1976.06. The number of parameters for the keyword *RATIO represents the number of pitch types for the corresponding tread pattern. Five parameters indicate that the tread pattern has five pitches: A, B, C, D, and E. The parameter values ​​represent the ratio of each tread pitch to the pitch of pitch A (the reference tread pitch). The keyword *ARRANGE corresponds to the order of the circumferential tread pitches, where 1, 2, 3, 4, and 5 correspond to tread pitches A, B, C, D, and E, respectively. This keyword uses multiple lines of parameters to describe the tire's circumferential tread pitch arrangement information, with a maximum of 10 parameters per line. This example tire tread pattern uses RIB variable pitch, requiring three pitch layout files: RIB1 and RIB3 are variable pitch arrangements with 62 circumferential pitches and 5 different pitches, with the ratios of each tread pitch to the A-pitch being 1, 0.921651026, 0.837918946, 0.753588959, and 0.672846951, respectively; RIB2 and RIB5 are variable pitch arrangements with 60 circumferential pitches and 5 different pitches, with the ratios of each tread pitch to the A-pitch being 1, 0.921651026, 0.837918946, 0.753588959, and 0.672846951, respectively; RIB4 is a circumferential 60-pitch constant pitch arrangement. The corresponding three pitch layout files are as follows: Figure 5 As shown. To achieve variable pitch RIBs, the section arrangement files are edited and imported in three stages based on the pattern RIB section arrangement information. Each RIB in the pattern is relatively independent. After importing the section arrangement files, each RIB is associated with its corresponding section arrangement file via a drop-down selection in the program settings interface, completing the section arrangement information reading and matching. RIB section arrangement information matching is as follows: Figure 6 As shown. The program defaults to each RIB section of the current single-section pattern being section A of the corresponding section row. Each RIB is scaled based on the associated section row information to generate the grid node information of other pattern pitches on the existing grid, and the entire circumference pattern is generated by topology generation.

[0069] Stp6: Use the program's one-click output function to complete the modeling and output of the entire RIB variable pitch pattern:

[0070] The entire RIB has a complex pattern of varying pitch, such as Figure 7 As shown.

[0071] In this embodiment, based on the relatively independent nature of each RIB in the pattern, the pattern's section arrangement can be quickly adjusted by modifying the association between each RIB and the section arrangement file in the program settings interface and then re-outputting the pattern's model information. When all RIBs correspond to the same section arrangement file, such as using a variable pitch section arrangement file with 62 circumferential sections and 5 different pitches, the final output pattern will be a conventional variable pitch complex pattern, such as... Figure 8 As shown.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents, all of which should be included within the scope of protection of the invention.

Claims

1. A method for modeling complex tire tread patterns and variable pitch based on a self-developed program, characterized in that, The specific steps include: Step S1: Construct a single-section two-dimensional tread geometric model based on the tire two-dimensional tread design drawing, and obtain the upper and lower contour boundary lines of the tire tread pattern based on the tire material distribution diagram, forming a format file; Step S2: Import the obtained format file as input into the self-written program module for processing to generate a two-dimensional mesh of the pattern. Simultaneously, the self-written program module adds pattern features. Specific steps include: Based on the obtained format file, the contour is mirrored according to the established rules by the self-written program module to obtain the complete upper and lower contour boundary lines in the tire section direction. Then, with the y-axis as the rotation axis, the virtual upper and lower rotating surface information is obtained. The self-written program module identifies each RIB inside a single pattern by judging the number and position of the circumferential pattern grooves, and numbers the RIBs in ascending order along the y-axis. Then, it adjusts the numbers as needed. After the overall mesh size is determined, the local mesh nodes are edited by dragging, and finally a two-dimensional mesh of the pattern is generated. The mesh is required to be all planar quadrilateral elements, and the generated three-dimensional mesh is all hexahedral elements. Meanwhile, pattern features can be set manually in the two-dimensional pattern setting interface of the self-written program module; Step S3: Edit and import the corresponding segment design information based on the segment design information of each rib separated by the circumferential tread grooves in the tread pattern; Step S4: Model and output the integer variable pitch pattern in the self-written program module.

2. The tire complex tread pattern variable pitch modeling method based on a self-developed program according to claim 1, characterized in that, The specific steps in step S1 of constructing a single-section two-dimensional tread geometric model based on the tire two-dimensional tread design drawing include: In 2D CAD design software, the middle tread block of the tire 2D tread pattern design drawing is selected for simplification and geometric cleanup. Finally, the 2D tread pattern design drawing is simplified into a 2D tread pattern geometric model that retains only a single pitch. Move the leftmost edge of the pattern centerline to the origin of the coordinate system in the 2D CAD design software. After processing, save it as a dxf file as the input file for the self-written program module.

3. The tire complex tread pattern variable pitch modeling method based on a self-developed program according to claim 1, characterized in that, The specific steps in step S1 of obtaining the upper and lower contour boundaries of the tire tread pattern based on the tire material distribution map include: The upper and lower contour boundary lines are obtained from the tire material distribution map. The upper contour boundary line is the outer contour line of the tire from the center of the tread to the boundary of the tread design width. The lower contour boundary line is formed by connecting the projection lines of the bottom of the tire circumferential tread grooves and the bottom of the lateral grooves on the material distribution map or the outer boundary of the cord layer at the tire shoulder. In 2D CAD design software, the leftmost position of the upper contour boundary line is set to 0 in the x-axis and equal to the tire's outer contour radius R in the y-axis. This allows the finite element model of the tire's complex 3D tread pattern to accurately match and fit with the remaining main body. After processing, it is saved as a dxf file as the input file for the self-written program module.

4. The tire complex tread pattern variable pitch modeling method based on a self-developed program according to claim 1, characterized in that, The specific steps in step S3 include: The self-written program module imports section arrangement files multiple times. Based on the section arrangement design information of each RIB in the pattern, it edits and imports the corresponding section arrangement files. All section arrangement files are stored in the program for later use. The program settings function selects the section arrangement file corresponding to each RIB to complete the reading and matching of section arrangement information.

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