A method and program product for quickly and automatically generating a finite element simulation model of asymmetric tire pattern

Abstract

The present invention relates to the field of tire finite element simulation methods, and in particular to a method and program product for quickly and automatically generating a tire asymmetric pattern finite element simulation model. The present invention can quickly and accurately generate a tire finite element simulation model with an asymmetric pattern by automatically assembling various components and automatically dividing the grid of the combined field, thereby shortening the research and development cycle and improving the simulation accuracy. The present invention is suitable for establishing finite element simulation models of various tires with asymmetric patterns, such as all-steel radial tires, semi-steel 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 method and program product for quickly and automatically generating a finite element simulation model of a tire asymmetric pattern, which is suitable for establishing finite element simulation models of various tires with asymmetric patterns, such as all-steel and semi-steel radial tires, bias tires, and engineering tires. Background Art

[0002] Tires are the part of the car that comes into direct contact with the road surface, and they are mainly responsible for transmitting the vehicle's driving force, braking force, and steering force. A large amount of practical experience and test results show that the pattern plays a decisive role in the tire's rolling resistance, wear, noise, hydroplaning, handling stability and other characteristics, so the tire performance simulation must consider the pattern. Usually, when establishing a tire finite element simulation model, half of the grid model is divided first, and then the other half of the model is generated symmetrically along the tire's center axis. However, in order to improve the handling performance of the tire, the pattern is often designed in an asymmetric form. At this time, the grid of the tire finite element simulation model needs to be manually adjusted, which is time-consuming and labor-intensive, and the grid accuracy is not easy to guarantee. Therefore, in order to shorten the R&D cycle and improve the simulation accuracy, it is necessary to invent a method for quickly and automatically generating a finite element simulation model of asymmetric tire patterns. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a method for quickly and automatically generating a finite element simulation model of a tire with an asymmetric pattern. The method can realize automatic and rapid division of the mesh of the finite element model of the tire with an asymmetric pattern.

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

[0005] A method for quickly and automatically generating a finite element simulation model of an asymmetric tire pattern, the method comprising the following steps:

[0006] 1) Divide the material distribution diagram of the complete design section of the tire in CAD into several areas, wherein the first area is the closed area of ​​the carcass except the top layer of base rubber, the second area is the closed area of ​​the left crown bounded by the central axis of the tire section, the third area is the closed area of ​​the right crown bounded by the central axis of the tire section, and the fourth area is the closed area of ​​the top layer of base rubber of the carcass;

[0007] 2) Then import the first domain, the second domain, and the third domain respectively to perform mesh division to generate the first model, the second model, and the third model;

[0008] 3) Perform node-coordinated meshing in the fourth domain to generate a finite element model of a tire section with an asymmetric tread pattern;

[0009] The node coordination grid partitioning method in the fourth field has the following specific steps:

[0010] 3.1) Read the number of upper nodes N1 and the number of lower nodes N2 in the fourth domain;

[0011] 3.2) Calculate the node number difference N = |N1-N2| and determine whether N is equal to 0;

[0012] 3.3) Based on the principle of proximity of upper and lower nodes, if N=0, a full quadrilateral unit is automatically generated in the fourth domain; if N≠0, a quadrilateral-triangle mixed unit is automatically generated in the fourth domain, where the number of triangle units is N;

[0013] 4) The generated tire section finite element model is rotated 360° around the specified rotation axis at specified intervals to generate an overall tire finite element model with an asymmetric pattern.

[0014] Preferably, the groove bottom area of ​​the second model and the third model is divided into at least one layer of units, and the grid division is consistent in the layer direction. In some cases, the groove bottom may also directly contact the first area.

[0015] Preferably, the first model, the second model, and the third model can be directly imported from an existing finite element mesh model database as mesh models with the same specifications or similar proportions, and the top unit of the first model is identified as the combination area 1, and the rightmost unit of the second model is identified as the combination area 2, and the mesh within the combination area is redivided to generate a tire section finite element model with an asymmetric pattern, and then the section finite element model is rotated 360° around a specified rotation axis at a specified interval to generate an overall tire finite element model with an asymmetric pattern.

[0016] Preferably, the method for re-dividing the grid in the combined field comprises the following specific steps:

[0017] 1) Read the number of upper nodes N1 and lower nodes N2 in combination with domain 1, and the number of upper nodes M1 and lower nodes M2 in combination with domain 2;

[0018] 2) Calculate the difference in the number of nodes N = |N1-N2|, M = |M1-M2| and determine whether N and M are equal to 0;

[0019] 3) According to the principle of proximity of upper and lower nodes, if N=0, full quadrilateral units are automatically generated in connection domain 1; if N≠0, quadrilateral-triangle mixed units are automatically generated in connection domain 1, where the number of triangular units is N; if M=0, full quadrilateral units are automatically generated in connection domain 2; if M≠0, quadrilateral-triangle mixed units are automatically generated in connection domain 2, where the number of triangular units is M.

[0020] Preferably, the first area can also be simplified into a closed area of ​​the tire body on the left or right side except for the top layer of base rubber, which is bounded by the central axis of the tire section; after the first area is divided into grids, a symmetrical grid model is generated along the central axis of the tire section by mirroring or other methods as the first model.

[0021] Preferably, the combination of the first model, the second model and the third model can also be implemented using general finite element software by one of the following two methods:

[0022] The specific steps of method 1 are as follows:

[0023] 1) Establish contact pair 1 in the area where the uppermost part of the first model contacts the lowermost part of the second model;

[0024] 2) Establish contact pair 2 in the area where the uppermost part of the first model contacts the lowermost part of the third model;

[0025] 3) Establish contact pair 3 in the area where the rightmost part of the second model contacts the leftmost part of the third model;

[0026] 4) Make rigid connections between contact pair 1, contact pair 2, and contact pair 3 respectively, or define the contact form between the contact pairs as non-separation after contact;

[0027] The specific steps of method 2 are as follows:

[0028] 1) The nodes in the area where the uppermost part of the first model contacts the lowermost part of the second model are used to establish node set 1, and the nodes in the area where the lowermost part of the second model contacts the uppermost part of the first model are used to establish node set 2;

[0029] 2) The nodes in the area where the uppermost part of the first model contacts the lowermost part of the third model are used to establish node set 3, and the nodes in the area where the lowermost part of the third model contacts the uppermost part of the first model are used to establish node set 4;

[0030] 3) The nodes in the area where the rightmost part of the second model contacts the leftmost part of the third model are used to establish node set 5, and the nodes in the area where the leftmost part of the third model contacts the rightmost part of the second model are used to establish node set 6;

[0031] 4) Determine whether the number of nodes in node set 1 is consistent with that in node set 2, node set 3 is consistent with that in node set 4, and node set 5 is consistent with that in node set 6;

[0032] 5) If the number of nodes is consistent: use linear constraint equations to maintain the same displacement between node set 1 and node set 2, node set 3 and node set 4, node set 5 and node set 6. If the number of nodes is inconsistent: this method is not applicable.

[0033] Furthermore, the present invention also discloses the application of the method in tire simulation design. The method is applicable to the establishment of finite element simulation models of tires with asymmetric patterns such as all-steel and semi-steel radial tires, bias tires, and engineering tires.

[0034] Furthermore, the present invention also discloses a computer device, including 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.

[0035] 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.

[0036] Furthermore, the present invention also discloses a computer program product, including a computer program or an instruction, characterized in that the method is implemented when the computer program or the instruction is executed by a processor.

[0037] The present invention adopts the above technical solution, and can quickly and accurately generate a tire finite element simulation model with an asymmetric pattern through automatic assembly of various components and automatic grid division of the combined field, thereby shortening the research and development cycle and improving the simulation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The material distribution diagram of the present invention is divided into various fields;

[0039] Figure 2 This is a schematic diagram of the first model of the present invention;

[0040] Figure 3 This is a schematic diagram of the second model of the present invention;

[0041] Figure 4 This is a schematic diagram of the third model of the present invention;

[0042] Figure 5 Finite element model of tire section with asymmetric tread;

[0043] Figure 6 An example of the node coordination grid partitioning method of the present invention is provided;

[0044] Figure 7 It is a schematic diagram of the field of combination of the present invention;

[0045] Figure 8 This is a (simplified) schematic diagram of the first field of the present invention;

[0046] Fig. 9 It is a schematic diagram of the contact pair of the present invention;

[0047] Fig.10It is a schematic diagram of a node set of the present invention;

[0048] Fig.11 Finite element model of a whole tire with asymmetric tread pattern;

[0049] Fig.12 is a flow chart of the present invention;

[0050] Fig.13 A flowchart of a meshing method for node coordination within the fourth domain;

[0051] Fig.14 Flowchart for achieving identification of combined domains;

[0052] Fig.15 A flowchart of the grid redivision method in the combined domain;

[0053] Fig.16 A flow chart of a method for implementing a combination of a first model, a second model and a third model using general finite element software;

[0054] Fig.17 Flowchart of method 2 for implementing the combination of the first model, the second model and the third model using general finite element software. DETAILED DESCRIPTION

[0055] The specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0056] like Fig.12 A method for quickly and automatically generating a finite element simulation model of a tire with an asymmetric tread is shown. The method and program for quickly and automatically generating a finite element simulation model with an asymmetric tread first divide the material distribution map of the complete design section of the tire (including the main groove of the crown pattern) in CAD into several areas (such as Figure 1 As shown in the figure, the first area is the closed area of ​​the carcass except the top layer of base rubber, the second area is the closed area of ​​the left crown bounded by the central axis of the tire section, the third area is the closed area of ​​the right crown bounded by the central axis of the tire section, and the fourth area is the closed area of ​​the top layer of base rubber of the carcass (as a combined area). Then, the first area, the second area, and the third area are imported respectively for mesh division to generate the first model, the second model, and the third model (as shown in the figure). Figure 2-4 As shown in the figure, the groove bottom area of ​​the second model and the third model is preferably divided into at least one layer of units, and the mesh division is consistent in the layer direction. In some cases, the groove bottom can also directly contact the first area. Finally, the node coordinated mesh division is performed in the fourth area (the upper and lower node positions are fixed) to generate a tire section finite element model with an asymmetric pattern (as shown in the figure). Figure 5Then, the cross-section finite element model is rotated 360° around the tire center axis at a specified interval to generate an overall tire finite element model with an asymmetric pattern (as shown in Fig.11 as shown).

[0057] like Fig.13 As shown, the grid division method for node coordination in the fourth field has the following specific steps:

[0058] 1) Read the number of upper nodes N1 and the number of lower nodes N2 in the fourth domain;

[0059] 2) Calculate the node number difference N = |N1-N2| and determine whether N is equal to 0;

[0060] 3) Based on the principle of upper and lower nodes being close, if N=0, a full quadrilateral unit is automatically generated in the fourth domain; if N≠0, a quadrilateral-triangle mixed unit is automatically generated in the fourth domain, where the number of triangular units is N, and the forms include but are not limited to Figure 6 The form shown.

[0061] like Fig.14 As shown, the first model, the second model, and the third model can be directly imported from the existing finite element mesh model database into mesh models with the same specifications or similar proportions, and the top unit of the first model is identified as the combination domain 1, and the rightmost unit of the second model is identified as the combination domain 2 (such as Figure 7 As shown in FIG. 1 ), the mesh in the combined area is re-divided to generate a tire section finite element model with an asymmetric pattern. The section finite element model is then rotated 360° around the tire center to generate an overall tire finite element model with an asymmetric pattern.

[0062] like Fig.15 As shown, the method for re-dividing the grid in the combined field has the following specific steps:

[0063] 1) Read the number of upper nodes N1 and the number of lower nodes N2 in combination field 1, and the number of upper nodes M1 and the number of lower nodes M2 in combination field 2.

[0064] 2) Calculate the difference in the number of nodes N = |N1-N2|, M = |M1-M2| and determine whether N and M are equal to 0;

[0065] 3) According to the principle of proximity of upper and lower nodes, if N=0, full quadrilateral units are automatically generated in connection domain 1; if N≠0, quadrilateral-triangle mixed units are automatically generated in connection domain 1, where the number of triangular units is N; if M=0, full quadrilateral units are automatically generated in connection domain 2; if M≠0, quadrilateral-triangle mixed units are automatically generated in connection domain 2, where the number of triangular units is M.

[0066] Of course, the first area can also be simplified to the tire section center axis as the boundary except the left (or right) carcass closed area of ​​the top layer of base rubber (such as Figure 8 After the first domain is meshed, a symmetrical mesh model is generated along the center axis of the tire section by mirroring or other methods as the first model.

[0067] like Fig.16 , Fig.17 As shown, the combination of the first model, the second model and the third model can also be realized by using general finite element software through the following two methods:

[0068] The specific steps of method 1 are as follows:

[0069] 1) Establish contact pair 1 in the area where the uppermost part of the first model contacts the lowermost part of the second model;

[0070] 2) Establish contact pair 2 in the area where the uppermost part of the first model contacts the lowermost part of the third model;

[0071] 3) Create contact pair 3 (e.g. Fig. 9 shown);

[0072] 4) Make rigid connections between contact pair 1, contact pair 2, and contact pair 3 respectively, or define the contact form between the contact pairs as non-separation after contact.

[0073] The specific steps of method 2 are as follows:

[0074] 1) The nodes in the area where the uppermost part of the first model contacts the lowermost part of the second model are used to establish node set 1, and the nodes in the area where the lowermost part of the second model contacts the uppermost part of the first model are used to establish node set 2;

[0075] 2) The nodes in the area where the uppermost part of the first model contacts the lowermost part of the third model are used to establish node set 3, and the nodes in the area where the lowermost part of the third model contacts the uppermost part of the first model are used to establish node set 4;

[0076] 3) The nodes in the area where the rightmost part of the second model contacts the leftmost part of the third model are used to establish node set 5, and the nodes in the area where the leftmost part of the third model contacts the rightmost part of the second model are used to establish node set 6 (such as Fig.10 shown);

[0077] 4) Determine whether the number of nodes in node set 1 is consistent with that in node set 2, node set 3 is consistent with that in node set 4, and node set 5 is consistent with that in node set 6;

[0078] 5) If the number of nodes is consistent: use linear constraint equations to maintain the same displacement between node set 1 and node set 2, node set 3 and node set 4, node set 5 and node set 6. If the number of nodes is inconsistent: this method is not applicable.

[0079] Using the method of the present invention, taking the specification of 285 / 40R20 as an example, the model creation time and analysis accuracy of the asymmetric pattern are compared with the existing method as follows:

[0080]

[0081] The present invention shortens the model making time by 70% while ensuring the analytical accuracy remains unchanged.

[0082] 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 quickly and automatically generating a finite element simulation model of an asymmetric tire pattern, characterized in that: The method comprises the following steps: 1) Divide the material distribution diagram of the complete design section of the tire in CAD into several areas, wherein the first area is the closed area of ​​the carcass except the top layer of base rubber, the second area is the closed area of ​​the left crown bounded by the central axis of the tire section, the third area is the closed area of ​​the right crown bounded by the central axis of the tire section, and the fourth area is the closed area of ​​the top layer of base rubber of the carcass; 2) Then import the first domain, the second domain, and the third domain respectively to perform mesh division to generate the first model, the second model, and the third model; 3) Perform node-coordinated meshing in the fourth domain to generate a finite element model of a tire section with an asymmetric tread pattern; The grid division method for node coordination in the fourth field has the following specific steps: 3.1) Read the number of upper nodes N1 and the number of lower nodes N2 in the fourth domain; 3.2) Calculate the node number difference N = |N1-N2| and determine whether N is equal to 0; 3.3) Based on the principle of proximity of upper and lower nodes, if N=0, a full quadrilateral unit is automatically generated in the fourth domain; if N≠0, a quadrilateral-triangle mixed unit is automatically generated in the fourth domain, where the number of triangle units is N; 4) The generated tire section finite element model is rotated 360° around the specified rotation axis at specified intervals to generate an overall tire finite element model with an asymmetric pattern.

2. The method for quickly and automatically generating a finite element simulation model of an asymmetric tire pattern according to claim 1, characterized in that: The trench bottom area of ​​the second model and the third model is divided into at least one layer of units.

3. The method for quickly and automatically generating a finite element simulation model of an asymmetric tire pattern according to claim 1, characterized in that: The first model, the second model, and the third model can be directly imported from an existing finite element mesh model database as mesh models with the same specifications or similar proportions, and the top unit of the first model is identified as the combination area 1, and the rightmost unit of the second model is identified as the combination area 2. The mesh within the combination area is redivided to generate a tire section finite element model with an asymmetric pattern, and then the section finite element model is rotated 360° around a specified rotation axis at a specified interval to generate an overall tire finite element model with an asymmetric pattern.

4. The method for quickly and automatically generating a finite element simulation model of an asymmetric tire pattern according to claim 3, characterized in that: The specific steps of the method for re-dividing the grid in the combined field are as follows: 1) Read the number of upper nodes N1 and lower nodes N2 in combination with domain 1, and the number of upper nodes M1 and lower nodes M2 in combination with domain 2; 2) Calculate the difference in the number of nodes N = |N1-N2|, M = |M1-M2| and determine whether N and M are equal to 0; 3) According to the principle of proximity of upper and lower nodes, if N=0, full quadrilateral units are automatically generated in connection domain 1; if N≠0, quadrilateral-triangle mixed units are automatically generated in connection domain 1, where the number of triangular units is N; if M=0, full quadrilateral units are automatically generated in connection domain 2; if M≠0, quadrilateral-triangle mixed units are automatically generated in connection domain 2, where the number of triangular units is M.

5. The method for quickly and automatically generating a finite element simulation model of an asymmetric tire pattern according to claim 1, characterized in that: The first area can also be simplified to a closed area of ​​the left or right side of the tire body with the center axis of the tire section as the boundary, excluding the top layer of base rubber; after the first area is divided into grids, a symmetrical grid model is generated along the center axis of the tire section by mirroring or other methods as the first model.

6. The method for quickly and automatically generating a finite element simulation model of an asymmetric tire pattern according to claim 3, characterized in that: The combination of the first model, the second model and the third model can also be realized by using general finite element software through one of the following two methods: The specific steps of method 1 are as follows: 1) Establish contact pair 1 in the area where the uppermost part of the first model contacts the lowermost part of the second model; 2) Establish contact pair 2 in the area where the uppermost part of the first model contacts the lowermost part of the third model; 3) Establish contact pair 3 in the area where the rightmost part of the second model contacts the leftmost part of the third model; 4) Make rigid connections between contact pair 1, contact pair 2, and contact pair 3 respectively, or define the contact form between the contact pairs as non-separation after contact; The specific steps of method 2 are as follows: 1) The nodes in the area where the uppermost part of the first model contacts the lowermost part of the second model are used to establish node set 1, and the nodes in the area where the lowermost part of the second model contacts the uppermost part of the first model are used to establish node set 2; 2) The nodes in the area where the uppermost part of the first model contacts the lowermost part of the third model are used to establish node set 3, and the nodes in the area where the lowermost part of the third model contacts the uppermost part of the first model are used to establish node set 4; 3) The nodes in the area where the rightmost part of the second model contacts the leftmost part of the third model are used to establish node set 5, and the nodes in the area where the leftmost part of the third model contacts the rightmost part of the second model are used to establish node set 6; 4) Determine whether the number of nodes in node set 1 is consistent with that in node set 2, node set 3 is consistent with that in node set 4, and node set 5 is consistent with that in node set 6; 5) If the number of nodes is consistent: use linear constraint equations to maintain the same displacement between node set 1 and node set 2, node set 3 and node set 4, node set 5 and node set 6. If the number of nodes is inconsistent: this method is not applicable.

7. Application of the method according to any one of claims 1 to 6 in tire simulation design.

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 6.

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 6 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 6 is implemented.

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