A tire pattern overall stiffness calculation method, system and computer software product

Abstract

The present invention relates to the technical field of tire simulation design, and in particular to a method, system and computer software product for calculating the overall stiffness of a tire pattern. The specific steps include: establishing a set of pattern nodes and other component node sets, applying road loads and simulating the compression state of the pattern, calculating the relationship curve between displacement and reaction force, calculating the overall stiffness of the pattern by the slope, and evaluating the performance of the pattern by the pattern stiffness change ratio. According to the stiffness change ratio, it is determined whether the pattern needs to be optimized and adjusted, thereby improving the handling performance, safety and stability of the tire. The method has high accuracy and operability, and provides a scientific basis for the design, optimization and performance analysis of tire patterns. Through the systematic calculation process of the present invention, the efficiency of tire design can be effectively improved, and reliable technical support can be provided for tire performance optimization.

Description

Technical Field

[0001] The present invention relates to the technical field of tire simulation design, and in particular to a tire pattern overall stiffness calculation method, system and computer software product. Background Art

[0002] Tire pattern is an important component in tire design, which directly affects the vehicle's handling performance, wear performance, traction performance and comfort. Especially when driving at high speed or turning, the stiffness of the pattern has a significant impact on the dynamic response of the tire. At present, the overall stiffness of the tire is usually obtained through experiments and simulation analysis, but the existing technical means can only obtain the overall stiffness of the tire, and cannot independently calculate the stiffness of the tire pattern part. This makes tire designers lack sufficient precision and accuracy in the process of pattern structure optimization and tire performance analysis.

[0003] Traditional tire stiffness analysis methods are usually calculated based on simple theoretical models or empirical formulas. These methods often simplify the complexity of the pattern structure and do not fully consider the change in stiffness under the compression state of the pattern. The compression state of the pattern is closely related to the actual working environment of the tire. In particular, when the tire is under load, the deformation and compression state of the pattern will significantly affect its stiffness. However, the existing theoretical analysis methods fail to fully consider this factor, resulting in low accuracy of the calculation results and failure to accurately reflect the impact of pattern stiffness on the overall performance of the tire.

[0004] In addition, due to the complexity and irregularity of tire patterns, traditional stiffness calculation methods are difficult to adapt to tire structures with complex patterns. In traditional analysis, pattern structures are often simplified into regular geometric shapes, thereby ignoring the impact of small structural changes in the pattern on stiffness. Although the Chinese invention patents applied for by the applicant (such as Patent 2021116135564, Patent 2022100923567 and Patent 2022105620611) have proposed several simulation analysis methods for tire performance, the existing technical means cannot provide accurate pattern stiffness evaluation, which limits the accuracy of tire design and also affects the further optimization of tire performance.

[0005] In summary, the existing technology lacks a method that can accurately calculate and evaluate the overall stiffness of tire patterns, which brings many difficulties to tire design, pattern optimization, and tire performance analysis. Therefore, a new method for calculating and evaluating tire pattern stiffness is urgently needed to improve the accuracy of pattern design, optimize the comprehensive performance of tires, and meet the high requirements of modern automobile industry for tire design and safety. Summary of the invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a method for calculating the overall stiffness of a tire pattern, which improves the accuracy of pattern design, optimizes the comprehensive performance of the tire, and meets the high requirements of the modern automobile industry for tire design and safety.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0008] A method for calculating the overall stiffness of a tire pattern comprises the following steps:

[0009] 1) Establish a finite element model of a tire with complex patterns, establish a pattern node set P, and a node set Q of other tire components except the pattern;

[0010] 2) Perform tire loading analysis based on actual air pressure p and load d, with the load applied through the road surface toward the tire center point;

[0011] 3) On the basis of step 2), the displacement of all degrees of freedom of the node set Q is fixed, that is, the current position of the node set Q is kept unchanged, and the load applied to the road surface is kept unchanged, so that the pattern is always kept in a compressed state;

[0012] 4) Based on step 3), displacements in all directions are applied to the road surface. Only the pattern node set P can be deformed. Calculation is performed to obtain a relationship curve between the displacement and reaction force of the road surface.

[0013] 5) According to the load and displacement curve obtained in step 4), take the slope near the zero point of the curve to calculate the overall stiffness E of the tire pattern in this direction i , where i represents the angle with the rolling direction;

[0014] 6) Draw the relationship curve between tire stiffness and direction and extract the maximum value E max and minimum value E min , calculate the pattern stiffness change ratio R:

[0015] R=(E max -E min ) / E max ×100%;

[0016] If the R value is greater than the preset threshold Rc, it means that the pattern stiffness does not meet the requirements and the pattern structure should be adjusted; if the R value is less than Rc, it means that the pattern stiffness meets the requirements.

[0017] Preferably, the load condition includes actual air pressure p and load d.

[0018] Preferably, the pattern node set P is a node set of the tire pattern area obtained by finite element modeling.

[0019] Preferably, the node set Q of other tire components includes nodes of the sidewall, crown and inner tube components of the tire.

[0020] Preferably, the air pressure p of the tire is 0.5 MPa and the load d is 20000N.

[0021] Preferably, the displacement is applied in a horizontal direction, a vertical direction and an oblique direction.

[0022] Preferably, the threshold value Rc of the pattern stiffness change ratio R is 2% to 10%.

[0023] Furthermore, the present invention also provides a tire pattern overall stiffness calculation system, which implements the method described above and includes the following modules:

[0024] a) a data acquisition module, used to obtain geometric parameters and material properties of the tire;

[0025] b) a model building module, used to establish a finite element model of the tire and generate a pattern node set P and a node set Q of other tire components;

[0026] c) a loading analysis module, used to perform loading analysis on the tire according to the actual air pressure p and load d;

[0027] d) Displacement application module, used to apply displacements in various directions to the road surface and perform deformation calculations;

[0028] e) a calculation module, used to calculate the overall stiffness of the tire pattern according to the load and displacement curve, and obtain the pattern stiffness change ratio R;

[0029] f) Output module, used to output tire tread stiffness results and evaluate whether they meet the requirements.

[0030] Furthermore, the present invention also provides a computer-readable storage medium having a computer program or instruction stored thereon, and the method is implemented when the computer program or instruction is executed by a processor.

[0031] Furthermore, the present invention also provides a computer program product, comprising a computer program or instructions, which implement the method when executed by a processor.

[0032] The present invention adopts the above technical solution to provide a method and system for calculating the overall stiffness of tire patterns. By accurately calculating the overall stiffness of tire patterns and their changes, the problem of being unable to independently calculate the stiffness of patterns in the prior art is solved, and effective technical support is provided for tire structure design and performance optimization. The specific technical effects are as follows:

[0033] 1. Accurate calculation of tread stiffness: The present invention accurately calculates the stiffness of tire treads by establishing a finite element model of a tire with complex treads and combining actual air pressure, load and other conditions. This method can take into account the effect of tread compression on stiffness, thereby providing more accurate tread stiffness data than traditional methods and avoiding the low-precision problem caused by simplified assumptions in traditional methods.

[0034] 2. Consider the influence of the compression state of the pattern: The calculation method of the present invention ensures that the pattern is always in a compressed state by fixing the node freedom of the non-pattern parts of the tire, thereby simulating the compression deformation of the pattern in actual use. This process makes the calculated stiffness value closer to the pattern stiffness under actual working conditions, which helps to optimize the pattern design and improve tire performance.

[0035] 3. Improve the accuracy of pattern design: By accurately calculating the pattern stiffness and its change ratio, the present invention can reveal the changes in pattern stiffness in different directions, and then judge whether the pattern stiffness meets the vehicle's control requirements. For pattern structures with large stiffness fluctuations, they can be discovered and adjusted in time, thereby improving the vehicle's control response and safety.

[0036] 4. Provide performance evaluation standards: The present invention establishes evaluation standards for tread stiffness by drawing a relationship curve between tire tread stiffness and direction, extracting the maximum and minimum values, and calculating the stiffness change ratio (R). By setting a threshold Rc, when the tread stiffness change ratio R is greater than the set value, it can prompt timely adjustment of the tread structure to avoid fluctuations in control response and ensure the driving stability and safety of the vehicle.

[0037] 5. Systematic and standardized calculation process: The calculation method of the present invention provides a systematic calculation scheme for tire tread stiffness by refining each step and combining advanced technologies such as finite element analysis, which has strong operability and repeatability. Tire design engineers can use this method and system to accurately evaluate the impact of different pattern structures on tire stiffness, thereby achieving a more optimized tire pattern design.

[0038] 6. Improve the efficiency of tire performance optimization: Through the pattern stiffness calculation and evaluation method of the present invention, tire designers can evaluate the stiffness characteristics of the pattern structure at the early stage of design, avoiding a large number of tests and repeated adjustments in the later stage, greatly improving the design efficiency. At the same time, it also makes the performance of the tire under complex road conditions more accurately predicted and optimized, meeting the higher requirements of the modern automobile industry for tire performance, stability and safety.

[0039] In summary, the present invention provides a technical solution that can accurately calculate and evaluate the overall stiffness of a tire pattern, solves the deficiencies in the prior art, and provides a more scientific and effective basis for the design, optimization, and performance evaluation of tire patterns. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is the tire finite element model;

[0041] Figure 2 It is the nodes of the tread pattern and the nodes of other tire components except the tread pattern;

[0042] Figure 3 The finite element model of the tire after applying load to the road surface;

[0043] Figure 4 The finite element model of the tire after applying displacements in all directions to the road surface;

[0044] Figure 5 The relationship curve between the displacement and the reaction force of the road surface when the displacements in the directions of 0°, 15°, 30° and 45° are applied to the road surface;

[0045] Figure 6 The relationship curve between the displacement and the reaction force of the road surface when the displacement is applied to the road surface at 60°, 75° and 90° directions;

[0046] Figure 7 It is the relationship curve between the advancing angle and the pattern stiffness;

[0047] Figure 8-Figure 14 The contact prints are obtained by applying displacements of 0°, 15°, 30°, 45°, 60°, 75° and 90° to the road surface respectively. DETAILED DESCRIPTION

[0048] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with 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.

[0049] The present invention provides a technical solution that can accurately calculate and evaluate the overall stiffness of tire treads, solves the deficiencies in the prior art, and provides a more scientific and effective basis for the design, optimization and performance evaluation of tire treads. Specifically, the following steps are included:

[0050] Step 1: Establish a finite element model of a tire with complex treads, establish a tread node set P, and a node set Q of other tire components except the treads;

[0051] Step 2: Load analysis is performed on the tire based on the actual air pressure p and load d. The load is applied through the road surface and in the direction toward the center of the tire.

[0052] Step 3: Based on the second step, fix the displacement of all degrees of freedom of the node set Q, that is, keep the current position of the node set Q unchanged, and keep the load applied to the road surface unchanged, so that the pattern always remains in a compressed state;

[0053] Step 4: Based on the third step, displacements in all directions are applied to the road surface. Since other nodes are fixed, only the pattern node set P can be deformed. Calculation is performed to obtain the relationship curve between the displacement of the road surface and the reaction force of the road surface.

[0054] Step 5: Based on the load and displacement curve obtained, take the slope near the zero point of the curve to calculate the overall stiffness of the tire pattern in this direction E i ,in i Represents the angle with the rolling direction;

[0055] Step 6: Draw a curve of the relationship between tire stiffness and direction, extract the maximum value and record it as E max , and the minimum E min , calculate the pattern stiffness change ratio R:

[0056] R=(E max -E min ) / E max ×100%;

[0057] If the tread stiffness in different directions varies too much, the handling response will easily fluctuate when the vehicle turns, affecting vehicle safety. Therefore, the R value should be set to be less than R c =2%~10% or according to the pattern stiffness fluctuation value of the target product R c When the R value is greater than R c It indicates that the pattern structure should be adjusted to improve the pattern stiffness. If the R value is less than R c When , it means the pattern stiffness meets the requirements.

[0058] The above steps realize the calculation and evaluation of the overall stiffness of the tire pattern, which can provide great guidance for tire structure design engineers.

[0059] The following describes the various steps of this embodiment in detail by taking a 205 / 55R16 tire as an example:

[0060] Step 1: Establish a finite element model of a tire with complex tread (such as Figure 1 As shown), establish the pattern node set P and the node set Q of other tire components except the pattern, as shown in Figure 2 As shown;

[0061] Step 2: Load the tire according to the actual air pressure p = 0.5Mpa and load d = 20000N. The load is applied through the road surface and the direction is toward the center of the tire. Figure 3 As shown;

[0062] Step 3: Based on the second step, fix the displacement of all degrees of freedom of the node set Q, that is, keep the current position of the node set Q unchanged, and keep the load applied to the road surface unchanged, so that the pattern always remains in a compressed state;

[0063] Step 4: Based on the third step, apply displacements of various angles to the road surface (such as Figure 4 ), since other nodes are fixed, only the pattern node set P can be deformed, and the relationship curve between the displacement of the road surface and the reaction force of the road surface is obtained by calculation, as shown in Figure 5 , Figure 6 The displacements in the directions of 0°, 15°, 30°, 45°, 60°, 75° and 90° are shown, and the relationship curve between the displacement and the reaction force of the road surface is shown. The contact print obtained is shown in Figure 8-14 As shown;

[0064] Step 5: Based on the load and displacement curve obtained, take the slope near the zero point of the curve (calculate the slope using the values ​​when the displacement is 0 and the displacement is 0.5) to calculate the overall stiffness of the tire pattern in this direction. E i ,in i Represents the angle from the scroll direction.

[0065] Step 6: Draw a curve of the relationship between tire stiffness and direction, such as Figure 7 As shown, the maximum value is extracted and recorded as E max =232.26N / mm, and the minimum value E min =219.47N / mm, calculate the pattern stiffness change ratio R:

[0066] R=(E max -E min ) / E max ×100%=5.5%.

[0067] This plan sets R c The value is set according to the reference tire, R c =6%, R value is less than R c , so it means that the pattern stiffness meets the requirements.

[0068] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A method for calculating the overall stiffness of a tire pattern, characterized in that: The following steps are involved: 1) Establish a finite element model of a tire with a complex pattern, establish a pattern node set P, and a node set Q of other tire components except the pattern, the node set Q includes the nodes of the tire sidewall, crown, and inner tube components; 2) Perform tire loading analysis based on actual air pressure p and load d, with the load applied through the road surface and in the direction toward the tire center point; 3) On the basis of step 2), the displacement of all degrees of freedom of the node set Q is fixed, that is, the current position of the node set Q is kept unchanged, and the load applied to the road surface is kept unchanged, so that the pattern is always kept in a compressed state; 4) On the basis of step 3), displacements are applied to the road surface in various directions, including horizontal, vertical and oblique directions; only the pattern node set P can be deformed, and calculations are performed to obtain a relationship curve between the displacement and reaction force of the road surface; 5) According to the load and displacement curve obtained in step 4), take the slope near the zero point of the curve to calculate the overall stiffness E of the tire pattern in this direction i , where i represents the angle with the rolling direction; 6) Draw the relationship curve between tire stiffness and direction and extract the maximum value E max and minimum value E min , calculate the pattern stiffness change ratio R: R=(E max -E min ) / E max ×100%; the threshold Rc is 2% to 10%. If the R value is greater than the preset threshold Rc, it means that the pattern stiffness does not meet the requirements and the pattern structure should be adjusted; if the R value is less than Rc, it means that the pattern stiffness meets the requirements.

2. The method according to claim 1, characterized in that The pattern node set P is a node set of the tire pattern area obtained by finite element modeling.

3. The method according to claim 1, characterized in that The air pressure p of the tire is 0.5 MPa, and the load d is 20000N.

4. A tire pattern overall stiffness calculation system, characterized in that: The system implements the method described in any one of claims 1 to 3, and comprises the following modules: a) a data acquisition module, used to obtain geometric parameters and material properties of the tire; b) a model building module, used to establish a finite element model of the tire and generate a pattern node set P and a node set Q of other tire components; c) a loading analysis module, used to perform loading analysis on the tire according to the actual air pressure p and load d; d) Displacement application module, used to apply displacements in various directions to the road surface and perform deformation calculations; e) a calculation module, used to calculate the overall stiffness of the tire pattern according to the load and displacement curve, and obtain the pattern stiffness change ratio R; f) Output module, used to output tire tread stiffness results and evaluate whether they meet the requirements.

5. 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, the method according to any one of claims 1 to 3 is implemented.

6. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

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