Processing method for optimizing tire contour smoothness

Abstract

The invention relates to the technical field of tire simulation and tire structure design, and particularly discloses a processing method for optimizing tire contour smoothness, which is used for solving the problem of unreasonable tire contour in the prior art. Comprising the following steps: step 1, designing a tire material distribution diagram-V0 version; 2, performing grid division on the tire material distribution diagram of the V0 edition, and defining a contour node set; 3, according to the tire performance and design requirements, simulation analysis of the working conditions such as inflation, loading and torsion is carried out on the V0 version scheme. According to the method, contour node coordinates are extracted through simulation analysis and development of a Python script, the circle center and the curvature radius of the contour node coordinates are solved, node position and radius adjustment is conducted on a concave curve according to the concave-convex degree of a tire contour curve, so that a convex curve with the curvature radius close to that of a connected curve is obtained, and finally smooth and reasonable tire inner and outer contours are obtained; and the high performance of the tire is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of tire simulation and tire structure design, and in particular to a processing method for optimizing the smoothness of tire profile. Background Art

[0002] The rational design of the inner and outer contours of the tire is one of the main factors to ensure the high performance of the tire. For example, the "sidewall" is the large bending deformation area of ​​the tire. The smoothness and rationality of its contour design will directly affect several important properties of the tire, such as stiffness, comfort, handling, and durability. Unreasonable contour design will cause bulges and depressions in the tire bead, which not only affects the aesthetics of the tire but also poses a safety hazard. Therefore, in the tire design process, a design method is needed to optimize the smoothness of the inner and outer contours of the tire, and through multiple rounds of design iterations, a smooth contour curve is finally designed. Summary of the invention

[0003] The purpose of the present invention is to provide a processing method for optimizing the smoothness of tire profile, thereby solving the problem of unreasonable tire profile in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for optimizing the smoothness of a tire profile comprises the following steps:

[0006] Step 1: Design tire material distribution map - V0 version;

[0007] Step 2: Mesh the tire material distribution map of version V0 and define the contour node set;

[0008] Step 3: Based on tire performance and design requirements, simulation analysis of inflation, loading, torsion and other working conditions is performed on the V0 version;

[0009] Step 4: Extract the coordinates of the sidewall outer contour nodes from the shoulder parting line to the bead waterproof line through the self-developed "Python script 1", and count the total number of nodes N;

[0010] Step 5: Use the self-developed "Python script 2" to read the coordinates of the three adjacent nodes in sequence (X i ,Y i )、(X i+1 ,Y i+1 )、(X i+2 ,Y i+2 ), and calculate the center coordinates of the circle passing through these three nodes (X oi ,Y oi ) and the radius of curvature R i ;

[0011] Step 6: Evaluate the smoothness of the contour;

[0012] Step 7: Repeat steps 5 and 6 respectively until the arc of the entire sidewall is determined;

[0013] Step 8: Open the sidewall_layout.txt file to check the smoothness and degree of smoothness of the contour.

[0014] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0015] In an optional solution: the specific step of step 6 is: if the center coordinate Y oi Than 3 adjacent nodes Y i , Y i+1 and Y i+2 are all small, then it can be determined that the outline composed of these three points is "convex"; otherwise, it can be determined that the outline composed of these three points is "concave"; and "concave", "convex" and "curvature radius" are written into the sidewall_layout.txt file.

[0016] In an optional solution: the specific operation in step eight is:

[0017] If the design requirements are met, the evaluation process is completed;

[0018] If the V0 version does not meet the design requirements, the curvature radius and node position of the "concave" arc are adjusted according to the judgment results of the V0 version, and the above process is repeated until the V1 version results that meet the design requirements are obtained, thereby determining a smooth and reasonable tire profile.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This application is not limited to the "sidewall outer contour". The smoothness design can be performed on different parts of the inner and outer contours of the entire tire; this application is not limited to "dent" optimization. The design and optimization of the "concave and convex" and the degree of "concave and convex" of the contours of different parts of the tire can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The flowchart of the present invention is for evaluating the smoothness and smoothness of the tire profile.

[0022] Figure 2 The figure shows the results of the determination of the smoothness of the sidewall profile of the V0 version of the present invention and the screenshots of its inner and outer profiles.

[0023] Figure 3 The figure shows the smoothness determination result of the sidewall profile of the V1 version of the present invention and the screenshots of its inner and outer profiles.

[0024] Figure 4 This is a principle diagram for determining the smoothness of the contour by finding the center and the radius of curvature through three adjacent points in the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] like Figure 1-Figure 4 As shown, an embodiment of the present invention provides a processing method for optimizing the smoothness of a tire profile, comprising the following steps:

[0028] Step 1: Design tire material distribution map - V0 version;

[0029] Step 2: Mesh the tire material distribution map of version V0 and define the contour node set;

[0030] Step 3: Based on tire performance and design requirements, simulation analysis of inflation, loading, torsion and other working conditions is performed on the V0 version;

[0031] Step 4: Taking the evaluation of the smoothness of the sidewall outer contour in the inflated state as an example; the coordinates of the sidewall outer contour nodes from the shoulder parting line to the bead waterproof line are extracted through the self-developed "Python script 1", and the total number of nodes N is counted;

[0032] Step 5: Use the self-developed "Python script 2" to read the coordinates of the three adjacent nodes in sequence (X i ,Y i )、(X i+1 ,Y i+1 )、(X i+2 ,Y i+2 ), and calculate the center coordinates of the circle passing through these three nodes (X oi ,Y oi ) and the radius of curvature R i ;

[0033] Step 6: Evaluate the smoothness of the contour;

[0034] If the center coordinate Y oi Than 3 adjacent nodes Y i , Y i+1 and Y i+2If all are smaller, then the contour formed by these three points is considered to be "convex"; otherwise, the contour formed by these three points is considered to be "concave"; and the "concave", "convex" and "curvature radius" are written into the sidewall_layout.txt file;

[0035] Step 7: Repeat steps 5 and 6 respectively until the arc of the entire sidewall is determined;

[0036] Step 8: Open the sidewall_layout.txt file to check the contour smoothness and smoothness;

[0037] If the design requirements are met, the evaluation process is completed;

[0038] If the V0 version does not meet the design requirements, the curvature radius and node position of the "concave" arc are adjusted according to the judgment result of the V0 version, and the above process is repeated until the V1 version result that meets the design requirements is obtained, thereby determining a smooth and reasonable tire profile;

[0039] Explanation of the design idea of ​​contour curve design by curve smoothness and smoothness:

[0040] 1. The center of the circle passing through the three points P1, P2 and P3 is Q1, and its ordinate Y_Q1 is smaller than the ordinates of the three points P1, P2 and P3. The arc formed by the three points P1, P2 and P3 is judged to be "convex";

[0041] 2. The center of the circle passing through the three points P3, P4 and P5 is Q2, and its ordinate Y_Q2 is greater than the ordinates of the three points P3, P4 and P5. The arc formed by the three points P3, P4 and P5 is determined to be "concave";

[0042] 3. The curvature radius R of the arc passing through the three points P1, P2 and P3 is less than the curvature radius R of the arc passing through the three points P3, P4 and P5. It is determined that the arc passing through the three points P1, P2 and P3 is smoother.

[0043] 4. By adjusting the position and radius of P4, the curve composed of P3, P4 and P5 changes from "concave" to "convex", and the curvature radius is close to the curvature radius of the curve composed of P1, P2 and P3.

[0044] Working principle: This application proposes a design method for optimizing the smoothness of tire contour. Through simulation analysis and development of Python scripts, the coordinates of contour nodes are extracted to obtain their center and curvature radius. According to the "concave and convex" degree of the tire contour curve, the node position and radius of the "concave" curve are adjusted to obtain a "convex" curve with a curvature radius close to that of the connected curve, and finally a smooth and reasonable inner and outer contour of the tire is obtained, thereby ensuring the high performance of the tire.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for optimizing the smoothness of a tire profile, characterized in that: The following steps are involved: Step 1: Design tire material distribution map - V0 version; Step 2: Mesh the tire material distribution map of version V0 and define the contour node set; Step 3: Based on tire performance and design requirements, simulation analysis of inflation, loading, torsion and other working conditions is performed on the V0 version; Step 4: Use the self-developed "Python script 1" to extract the coordinates of the sidewall outer contour nodes from the shoulder parting line to the bead waterproof line, and count the total number of nodes N; Step 5: Use the self-developed "Python script 2" to read the coordinates of the three adjacent nodes (X i ,Y i )、(X i+1 ,Y i+1 )、(X i+2 ,Y i+2 ), and calculate the center coordinates of the circle passing through these three nodes (X oi ,Y oi ) and the radius of curvature R i ; Step 6: Evaluate the smoothness of the contour; Step 7: Repeat steps 5 and 6 respectively until the arc of the entire sidewall is determined; Step 8: Open the sidewall_layout.txt file to check the smoothness and degree of smoothness of the contour.

2. The method for optimizing the smoothness of tire profile according to claim 1, characterized in that: The specific step six is: if the center coordinate Y oi Than 3 adjacent nodes Y i , Y i+1 and Y i+2 If all are smaller, then the outline formed by these three points is determined to be "convex"; otherwise, the outline formed by these three points is determined to be "concave"; and "concave", "convex" and "curvature radius" are written into the sidewall_layout.txt file.

3. The method for optimizing the smoothness of tire profile according to claim 1, characterized in that: The specific operations in step eight are: If the design requirements are met, the evaluation process is completed; If the V0 version does not meet the design requirements, the curvature radius and node position of the "concave" arc are adjusted according to the judgment results of the V0 version, and the above process is repeated until the V1 version results that meet the design requirements are obtained, thereby determining a smooth and reasonable tire profile.

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