A calculation method, application, device, medium and computer program for tyre eccentric wear parameters

Abstract

The present invention relates to the technical field of tire intelligent design, and in particular to a method, application, device, medium and computer program for calculating eccentric wear parameters of a tire based on ground contact pressure distribution. The method includes obtaining a ground contact pressure distribution diagram of the tire, analyzing the ground contact pressure distribution diagram of the tire, defining and calculating a series of parameters and defining and calculating an eccentric wear parameter β; the method only needs to provide the ground contact pressure distribution of the tire during use, and the degree of eccentric wear of the tire can be predicted according to the ground contact pressure distribution.

Description

Technical Field

[0001] The present invention relates to the technical field of tire intelligent design, and in particular to a method, application, device, medium and computer program for calculating tire eccentric wear parameters based on ground contact pressure distribution. Background Art

[0002] Tires are the only ground-connected parts of a car. The matching of tires, road surfaces and car chassis forms various performances of the car. Tire performance is crucial to car research and analysis. There are many factors that affect tire performance, among which the ground pressure distribution of tires is particularly critical, and it plays an important role in the structural design of tires. The ground pressure distribution of tires can directly affect its wear performance, rolling resistance, handling stability, noise, etc., among which the wear performance is particularly direct and critical. Uneven tire wear (eccentric wear) is a common form of abnormal wear, which will greatly reduce the service life of tires. At present, the tire industry does not have a professional eccentric wear resistance test project, and cannot effectively avoid the phenomenon of eccentric wear of tires during use.

[0003] A Chinese invention patent application (publication number CN104897497A, publication date: 20150909) discloses a method for improving wear resistance by analyzing tire contact pressure distribution. The method analyzes parameters such as the footprint area, average pressure, rectangular coefficient, and pressure distribution unevenness of the tire contact pressure distribution, and then processes these data through software to guide the improvement of tire structure design and achieve product optimization and selection.

[0004] The existing technology has the following deficiencies: the invention only proposes a mathematical model to analyze the ground pressure distribution to guide the structural design and improve the tire wear performance, but the mathematical model is relatively simple and its accuracy needs to be verified. Moreover, the invention cannot predict the degree of uneven wear of the tire. Summary of the invention

[0005] The purpose of the present invention is: to address the above-mentioned problems, to propose a tire eccentric wear parameter calculation method, application, equipment, medium and computer program based on the ground pressure distribution, which only needs to provide the ground pressure distribution of the tire during use, and calculate the eccentric wear parameter β based on the ground pressure distribution, so as to be able to predict the degree of eccentric wear of the tire based on the eccentric wear parameter β.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A method for calculating eccentric wear parameters of a tire based on ground contact pressure distribution, characterized in that the method comprises the following steps:

[0008] 1) Use the tire drum test bench and Tekscan pressure blanket to test the tire ground pressure distribution and obtain the tire ground pressure distribution diagram;

[0009] 2) Analyze the tire ground pressure distribution diagram, define and calculate a series of parameters:

[0010] Contact length: When the tire is under vertical load, the tread contacts the rigid road surface, and the distance along the tangent direction of the tire circumference is expressed by L, in mm. Lm represents the average contact length, and Lz represents the contact length at the center position.

[0011] Ground contact width: The maximum distance along the wheel axle direction from the outer edge of the tire's ground contact surface when the tire's tread contacts the rigid road surface under vertical load, expressed as W, in mm.

[0012] Contact area: the actual contact area between the tire and the rigid road surface, represented by S, unit mm2;

[0013] Ground contact pressure distribution footprint area: the projected area of ​​the tire on the rigid road surface, represented by A, in mm2;

[0014] Ground contact pressure: the contact pressure between the tire and the rigid road surface, expressed as P, unit kPa;

[0015] Average ground contact pressure: the ratio of tire load to ground contact area, expressed as Pm, Pm=F (tire load) / S, unit kPa;

[0016] Ground contact coefficient: the shape coefficient of the tire ground contact pressure distribution graph, expressed as D, D = A / WLz;

[0017] Ground contact sea-land ratio: the ratio of ground contact area to footprint area, expressed as H, H=S / A;

[0018] 3) Define and calculate the eccentric wear parameter β:

[0019] ,

[0020] Where Li is the contact length of a certain section in the contact pressure distribution diagram. The contact lengths at different positions of the tire contact pressure distribution are not consistent. The contact length is divided into n sections from left to right along the tire transverse direction. n is an odd number. The average contact length of each section is Li; Pi is the average pressure corresponding to the contact section; Hi is the contact sea-land ratio of the contact section.

[0021] Preferably, according to factors such as tire specifications and the complexity of ground contact pressure distribution, n is greater than or equal to 5 and less than or equal to 15.

[0022] Preferably, Pi is read in the Tekscan pressure blanket analysis software TireScan.

[0023] Preferably, the calculated eccentric wear parameter β is used to predict the degree of eccentric wear of the tire.

[0024] In addition, the present invention also discloses a method for predicting the degree of eccentric wear of tires. The method adopts an eccentric wear parameter β calculated by a tire eccentric wear parameter calculation method based on ground pressure distribution to analyze the eccentric wear of tires: the eccentric wear parameter β is a parameter that can predict eccentric wear of tires. The larger the β value, the greater the degree of eccentric wear of the tire. According to experience, when β≤240, the tire does not have eccentric wear; when 240<β≤1200, the tire has slight eccentric wear; when β>1200, the tire has more serious eccentric wear.

[0025] In addition, the present invention also discloses a computer device, including a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement steps 2) to 3) in a method for calculating tire eccentric wear parameters based on ground pressure distribution; or, to implement a method for predicting the degree of tire eccentric wear.

[0026] In addition, the present invention also discloses a computer-readable storage medium having a computer program or instruction stored thereon. When the computer program or instruction is executed by a processor, the steps 2) to 3) in a method for calculating tire eccentric wear parameters based on ground pressure distribution are implemented; or, a method for predicting the degree of tire eccentric wear is implemented.

[0027] In addition, the present invention also discloses a computer program product, including a computer program or an instruction, characterized in that when the computer program or the instruction is executed by a processor, it implements the steps 2) to 3) of the method described in any one of claims 1 to 3; or, implements the method described in claim 5.

[0028] The advantages of the method, device, medium and program for predicting the degree of eccentric wear of tires based on ground contact pressure distribution using the above technical solution are:

[0029] The present invention proposes a method for predicting eccentric wear of tires, which only requires testing the ground contact pressure distribution of the tires and calculating the eccentric wear parameters of the tires according to the analysis data of the ground contact pressure distribution. The mathematical model for calculating the eccentric wear parameters is proposed by combining tire design theory and a large amount of actual test data, and is accurate and reliable. This ensures that the use of this method can guide structural design, improve tire wear performance, and predict the degree of eccentric wear of the tire according to the calculated eccentric wear parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The flowchart is a method for predicting the degree of tire wear based on ground contact pressure distribution.

[0031] Figure 2 This is the ground contact pressure distribution diagram of the tire in Example 1.

[0032] Figure 3This is a real picture of the tire in Example 1 after use.

[0033] Figure 4 This is the ground contact pressure distribution diagram of the tire in Example 2.

[0034] Figure 5 This is a real picture of the tire in Example 2 after use. DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] Take a 12R22.5 tire and test its ground pressure distribution. The results are as follows: Figure 2 As shown in the figure, since the tire has a simple pattern of straight longitudinal grooves, it is divided into 5 sections based on the center line of the imprint groove. The average length from left to right is 217.8mm, 244.5mm, 240.6mm, 236.1mm, 196.4mm; the average pressure is 786.6kPa, 953.3kPa, 1153.5kPa, 978.6kPa, 695.6kPa; the ground contact sea-land ratio is 0.83, 0.73, 0.76, 0.72, 0.84. The imprint width W = 230mm, the ground contact coefficient D = 0.79, and the eccentric wear parameter β = 730.9. The prediction results show that the tire will experience slight eccentric wear when in use.

[0038] Figure 3 The picture shows the actual tire after 30,000 kilometers of road testing. From the picture, it can be seen that the tire shoulder has a certain degree of uneven wear, which is in line with the predicted results.

[0039] Example 2

[0040] Take a 295 / 80R22.5 tire and test its ground pressure distribution. The results are as follows: Figure 4 As shown in the figure, since the tire has a simple pattern of straight longitudinal grooves, it is divided into 7 sections with the center line of the imprint groove as the boundary. The average length from left to right is 254.3mm, 251.4mm, 247.6mm, 247.3mm, 247.5mm, 250.6mm, 253.8mm; the average pressure is 997.6kPa, 965.3kPa, 975.3kPa, 1012.6kPa, 976.2kPa, 952.1kPa, 992.7kPa; the ground contact sea-land ratio is 0.75, 0.77, 0.79, 0.82, 0.78, 0.76, 0.74. The imprint width W = 240mm, the ground contact coefficient D = 1.15, and the eccentric wear parameter β = 64.3. The prediction results show that the tire will not wear eccentrically when in use.

[0041] Figure 5 The picture shows the actual tire after 30,000 kilometers of road testing. From the picture, it can be seen that the tire did not suffer from uneven wear, which is in line with the predicted results.

[0042] The present invention proposes a method for predicting eccentric wear of tires, which only requires testing the ground contact pressure distribution of the tires and calculating the eccentric wear parameters of the tires according to the analysis data of the ground contact pressure distribution. The mathematical model for calculating the eccentric wear parameters is proposed by combining tire design theory and a large amount of actual test data, and is accurate and reliable. This ensures that the use of this method can guide structural design, improve tire wear performance, and predict the degree of eccentric wear of the tire according to the calculated eccentric wear parameters.

Claims

1. A method for calculating eccentric wear parameters of tires based on ground contact pressure distribution, characterized in that: The method comprises the following steps: 1) Use the tire drum test bench and Tekscan pressure blanket to test the tire ground pressure distribution and obtain the tire ground pressure distribution diagram; 2) Analyze the tire ground pressure distribution diagram, define and calculate a series of parameters: Contact length: When the tire is under vertical load, the tread contacts the rigid road surface, and the distance along the tangent direction of the tire circumference is expressed by L, in mm. Lm represents the average contact length, and Lz represents the contact length at the center position. Ground contact width: The maximum distance along the wheel axle direction from the outer edge of the tire's ground contact surface when the tire's tread contacts the rigid road surface under vertical load, expressed as W, in mm. Contact area: The actual contact area between the tire and the rigid road surface, represented by S, unit mm 2 ; Ground contact pressure distribution footprint area: The projected area of ​​the tire on the rigid road surface, represented by A, in mm 2 ; Ground contact pressure: the contact pressure between the tire and the rigid road surface, expressed as P, unit kPa; Average ground contact pressure: the ratio of tire load to ground contact area, expressed as Pm, Pm=F / S, unit kPa, F is tire load; Ground contact coefficient: the shape coefficient of the tire ground contact pressure distribution graph, expressed as D, D = A / WLz; Ground contact sea-land ratio: the ratio of ground contact area to footprint area, expressed as H, H=S / A; 3) Define and calculate the eccentric wear parameter β: ， Where Li is the contact length of a certain section in the contact pressure distribution diagram. The contact lengths at different positions of the tire contact pressure distribution are not consistent. The contact length is divided into n sections from left to right along the tire transverse direction. n is an odd number. The average contact length of each section is Li; Pi is the average pressure corresponding to the contact section; Hi is the contact sea-land ratio of the contact section.

2. A method for calculating eccentric wear parameters of tires based on ground contact pressure distribution according to claim 1, characterized in that: According to the specifications of the tire and the complexity of the ground pressure distribution, n is greater than or equal to 5 and less than or equal to 15.

3. The method for calculating eccentric wear parameters of tires based on ground contact pressure distribution according to claim 1, characterized in that: Pi is read in Tekscan pressure blanket analysis software TireScan.

4. The method according to any one of claims 1 to 3, characterized in that: The calculated eccentric wear parameter β is used to predict the degree of eccentric wear of the tire.

5. A method for predicting the degree of eccentric wear of a tire, characterized in that: The method uses the eccentric wear parameter β calculated by the method described in any one of claims 1 to 3 to analyze the eccentric wear of the tire: the eccentric wear parameter β is a parameter that can predict the eccentric wear of the tire, and the larger the β value, the greater the degree of eccentric wear of the tire; according to experience, when β≤240, the tire does not have eccentric wear; when 240<β≤1200, the tire has slight eccentric wear; when β>1200, the tire has more serious eccentric wear.

6. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps 2) to 3) of the method according to any one of claims 1 to 3; or, implements the method according to claim 5.

7. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: When the computer program or instruction is executed by a processor, it implements the steps of step 2) to step 3) in the method described in any one of claims 1 to 3; or, it implements the method described in claim 5.

8. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, it implements the steps of step 2) to step 3) in the method described in any one of claims 1 to 3; or, it implements the method described in claim 5.

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