A fast convergence method, application and program product for finite element tire simulation using virtual rim

Abstract

The present invention relates to the field of tire finite element simulation methods, and in particular to a finite element tire simulation rapid convergence method, application and program product using a virtual rim. The present invention establishes an equivalent virtual rim model to achieve relative constraints on the contact position between the virtual rim and the tire, thereby changing the contact state between the tire and the rim, which can greatly improve the convergence of tire finite element analysis under large strain, multiple working conditions and large load conditions. It has been verified that the simulation results using the virtual rim are highly consistent with those using the actual rim. The method improves the analysis efficiency and shortens the research and development cycle while ensuring the analysis accuracy. The present invention is suitable for finite element simulation of various tires such as all-steel radial tires, semi-steel radial tires, bias tires, engineering tires, etc.

Description

Technical Field

[0001] The present invention relates to the field of tire finite element simulation methods, and in particular to a finite element tire simulation rapid convergence method using a virtual rim, an application and a program product, which is suitable for finite element simulation of various tires such as all-steel and semi-steel radial tires, bias tires, and engineering tires. Background Art

[0002] Tires are composites composed of many different types of rubber, cords, and skeleton materials. Therefore, when the tire touches the ground, the deformation exhibits highly nonlinear characteristics (geometric nonlinearity, material nonlinearity, boundary condition nonlinearity, etc.). Some physical quantities of tires cannot be obtained by simply relying on actual measurements. With the continuous development of finite element technology, finite element simulation has been widely used in tires. However, due to the high nonlinearity of tires, it is very easy to non-converge when using implicit algorithms to solve. Through analysis, we found that when the tire is under large strain, multiple working conditions, and large loads, the slippage between the tire and the rim near the contact area (insufficient contact constraints) is the fundamental reason for the non-convergence of the analysis. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a fast convergence method for finite element tire simulation using a virtual rim. The method achieves the constraint effect of the actual rim by establishing an equivalent virtual rim model, and solves the problem of analytical non-convergence caused by the existing contact constraint method between the tire and the rim under large strain, multiple working conditions, and large load conditions.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A fast convergence method for finite element tire simulation using a virtual rim, the method comprising the following steps:

[0006] First parsing step:

[0007] 1) Establishing a 2D axisymmetric initial model of a tire with a rim;

[0008] 2) Define the rubber material model and material property values ​​for the initial model;

[0009] 3) Define the skeleton structure and material property values ​​for the initial model;

[0010] 3) Inflate to the specified working pressure and perform simulation;

[0011] 4) According to the simulation results, the contact positions between the inflated tire and the rim are identified, and these nodes are established as a node set RIM-NODES as the outline of the virtual rim;

[0012] Second analysis step:

[0013] 5) In the first analytical step, at the final mating position of the rim and the tire, the relative position of the virtual rim and the tire is fully constrained;

[0014] 6) Carry out simulation under the load condition of air pressure of 0Kpa;

[0015] 7) Exporting the node coordinates of all nodes on the tire at this time, and using these node coordinates to update the initial model, generating a new 2D axisymmetric model using a virtual rim;

[0016] The third analysis step:

[0017] 8) Using the new model generated in the second analytical step as the tire initial cross-sectional structural model, and rigidifying the virtual rim, and setting the rigid reference point;

[0018] 9) Further inflation and grounding analysis is performed according to the specified working conditions.

[0019] Preferably, the rubber material model and material property values ​​defined in step 2) include: Young's modulus, Poisson's ratio, rubber density and rubber viscoelastic coefficient; the skeleton structure and material property values ​​defined in step 3) include: cord structure shape, cord diameter, cord spacing and angle.

[0020] Preferably, the inflation and grounding analysis described in step 9) comprises the following steps:

[0021] 2D inflation analysis:

[0022] 9.1) Fully constrain the virtual rim;

[0023] 9.2) Inflate to the specified working pressure;

[0024] 3D grounding analysis:

[0025] 9.3) The results of the 2D axisymmetric inflation analysis are transferred to 3D and rotated to generate a 3D tire model;

[0026] 9.4) Establish a road surface rigid body model and set the rigid body reference point;

[0027] 9.5) Setting the contact between the road surface and the tread;

[0028] 9.6) Apply specified working load to the road surface;

[0029] 9.7) Output relevant physical quantities according to analytical requirements.

[0030] As another preferred embodiment, the inflation and grounding analysis described in step 9) includes the following steps:

[0031] 9.1) Rotate the 2D axisymmetric model to generate a 3D tire model;

[0032] 9.2) Establish a road surface rigid body model and set the rigid body reference point;

[0033] 9.3) Setting the contact between the road surface and the tread;

[0034] 9.4) Fully constrain the virtual rim;

[0035] 9.5) Inflate to the specified working pressure;

[0036] 9.6) Apply specified working load to the road surface;

[0037] 9.7) Output relevant physical quantities according to analytical requirements.

[0038] Preferably, the output-related physical quantities include: displacement, stress, strain, contact pressure, contact area, reaction force and energy density.

[0039] Preferably, the outline of the virtual rim described in step 3) is a curve segment fitted by the node set RIM-NODES.

[0040] Furthermore, the present invention also discloses the application of the finite element tire simulation fast convergence method using a virtual rim in tire finite element simulation. Preferably, the tire includes a full steel radial tire, a semi-steel radial tire, a bias tire and an engineering tire.

[0041] Furthermore, 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 the method.

[0042] Furthermore, the present invention also discloses a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the method is implemented.

[0043] Furthermore, the present invention also discloses a computer program product, including a computer program or instructions, which implement the method when executed by a processor.

[0044] The present invention adopts the above-mentioned technical solution, establishes an equivalent virtual rim model, realizes the relative constraint of the contact position between the virtual rim and the tire, and changes the contact state between the tire and the rim, which can greatly improve the convergence of the tire finite element analysis under large strain, multiple working conditions, and large load conditions. It has been verified that the simulation results using the virtual rim are highly consistent with those using the actual rim. This method improves the analysis efficiency and shortens the research and development cycle while ensuring the analysis accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Flowchart of the present invention.

[0046] Figure 2 Schematic diagram of the contact nodes between the tire and the rim after inflation.

[0047] Figure 3 New 2D axisymmetric model using virtual rim. DETAILED DESCRIPTION

[0048] In order to more clearly demonstrate the purpose and technical solution of the present invention, the present invention is further described in detail below in conjunction with a 205 / 55R16 tire. The described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained in the art without creative work are within the protection scope of the present invention.

[0049] like Figure 1 As shown, a finite element tire simulation rapid convergence method using a virtual rim of the present invention comprises the following steps:

[0050] 1. Establish the initial 2D axisymmetric model of the tire with rim;

[0051] 2. Define the rubber material model and material properties (Young's modulus, Poisson's ratio, rubber density, and rubber viscoelastic coefficient) for the initial model;

[0052] 3. Define the skeleton structure and material properties for the initial model (skeleton structure shape, cord diameter, cord spacing, angle, etc.);

[0053] 4. Inflate to 250KPa and perform simulation;

[0054] 5. According to the simulation results, identify the contact nodes between the inflated tire and the rim (such as Figure 2 As shown), these nodes are established as a node set RIM-NODES as the outline of the virtual rim;

[0055] 6. Completely constrain the relative position of the virtual rim and tire at the final mating position of the rim and tire;

[0056] 7. Reduce the air pressure to 0Kpa and perform simulation;

[0057] 8. Export the node coordinates of all nodes on the tire at this time, and use these node coordinates to update the initial model to generate a new 2D axisymmetric model using a virtual rim (such as Figure 3 shown);

[0058] 9. Use the generated 2D axisymmetric new model as the initial cross-sectional structure model of the tire, rigidify the virtual rim, and set the rigid reference point;

[0059] 10. Perform 2D inflation analysis:

[0060] 1) Fully constrain the virtual rim;

[0061] 2) Inflate to 250KPa;

[0062] 11. Perform 3D grounding analysis:

[0063] 1) The results of the 2D axisymmetric inflation analysis are transferred to 3D and rotated to generate a 3D tire model;

[0064] 2) Establish a road surface rigid body model and set the rigid body reference point;

[0065] 3) Setting the contact between the road surface and the tread;

[0066] 4) Apply a load of 5880N to the road surface;

[0067] 5) Output relevant physical quantities (displacement, stress, strain, contact pressure, contact area, reaction force, energy density, etc.) according to analysis requirements.

[0068] The analysis accuracy and analysis time of the new finite element tire simulation method using virtual rims are compared with the simulation method using real rims as follows:

[0069]

[0070] The present invention shortens the model analysis time by 50% under the premise of ensuring the analysis accuracy remains unchanged.

[0071] 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 fast convergence method for finite element tire simulation using a virtual rim, characterized in that: The method comprises the following steps: First parsing step: 1) Establish a 2D axisymmetric initial model of a tire with a rim; 2) Define the rubber material model and material property values ​​for the initial model; 3) Define the skeleton structure and material property values ​​for the initial model; 3) Inflate to the specified working pressure and perform simulation; 4) According to the simulation results, the contact positions between the inflated tire and the rim are identified, and these nodes are set up as a node set RIM-NODES as the contour of the virtual rim; Second analysis step: 5) In the first analytical step, at the final mating position of the rim and the tire, the relative position of the virtual rim and the tire is fully constrained; 6) Perform simulation under the load condition of air pressure of 0Kpa; 7) Export the node coordinates of all nodes on the tire at this time, and use these node coordinates to update the initial model to generate a new 2D axisymmetric model using a virtual rim; The third analysis step: 8) Use the new model generated in the second analytical step as the initial cross-sectional structure model of the tire, rigidify the virtual rim, and set the rigid reference point; 9) Further inflation and grounding analysis is performed according to the specified working conditions.

2. The method for rapid convergence of finite element tire simulation using a virtual rim according to claim 1, characterized in that: The rubber material model and material property values ​​defined in step 2) include: Young's modulus, Poisson's ratio, rubber density and rubber viscoelastic coefficient; the skeleton structure and material property values ​​defined in step 3) include: cord structure shape, cord diameter, cord spacing and angle.

3. The method for rapid convergence of finite element tire simulation using a virtual rim according to claim 1, characterized in that: The inflation and grounding analysis described in step 9) includes the following steps: 2D inflation analysis: 9.1) Fully constrain the virtual rim; 9.2) Inflate to the specified working pressure; 3D grounding analysis: 9.3) The results of the 2D axisymmetric inflation analysis are transferred to 3D and rotated to generate a 3D tire model; 9.4) Establish a road surface rigid body model and set the rigid body reference point; 9.5) Set the contact between the road surface and the tread; 9.6) Apply specified working loads to the road surface; 9.7) Output relevant physical quantities according to analytical requirements.

4. The method for rapid convergence of finite element tire simulation using a virtual rim according to claim 1, characterized in that: The inflation and grounding analysis described in step 9) includes the following steps: 9.1) Rotate the 2D axisymmetric model to generate a 3D tire model; 9.2) Establish a road surface rigid body model and set the rigid body reference point; 9.3) Set the contact between the road surface and the tread; 9.4) Fully constrain the virtual rim; 9.5) Inflate to the specified working pressure; 9.6) Apply specified working loads to the road surface; 9.7) Output relevant physical quantities according to analytical requirements.

5. The fast convergence method of finite element tire simulation using a virtual rim according to claim 3 or 4, characterized in that: The output related physical quantities include: displacement, stress, strain, contact pressure, contact area, reaction force and energy density.

6. The method for rapid convergence of finite element tire simulation using a virtual rim according to claim 1, characterized in that: The outline of the virtual rim in step 3) is a curve segment fitted by the node set RIM-NODES.

7. Application of the finite element tire simulation fast convergence method using a virtual rim as described in any one of claims 1 to 6 in tire finite element simulation; preferably, the tire includes an all-steel radial tire, a semi-steel radial tire, a bias tire and an engineering tire.

8. 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 method according to any one of claims 1 to 7.

9. 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 described in any one of claims 1 to 7 is implemented.

10. 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 described in any one of claims 1 to 7 is implemented.

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