KR20090067709A - A tire design method for estimating a tire performance - Google Patents

Abstract

A tire design method for estimating tire performance is provided to analyze results due to various design factor changes, thereby shortening time required for finding an optimum design plan. A design factor and a change range of the factor are selected in a 2D drawing(ST40). A changed 2D element mesh is rotated symmetrically around an axis to generate a 3D element mesh(ST60). FE(Finite Element) analysis is performed(ST70). If tire performance is satisfactory, design is completed(ST90). A tire is manufactured(ST100).

Description

Tire design method for estimating a tire performance

The present invention relates to a tire design method for tire performance prediction for designing tires for predicting tire performance. In particular, the time required to find an optimal design by comparing and analyzing the results of various design factors by automating tire design It relates to a tire design method for predicting tire performance that can shorten the time.

Computer Aided Design (CAD) and Computer Aided Engineering (CAE) play an important role in the design phase to satisfy various performances such as tire cornering, wear and durability.

CAD provides the pre-manufacturing design, and CAE predicts and judges the results of the design and presents the appropriate design.

Finite Element Method (FEM) of CAE is the most commonly used method of dividing into nodes with nodes using design plans (drawings) made in CAD, and finding solutions that satisfy boundary conditions. Various results from the FEM are applied as a basis for various tire performance judgments.

In the conventional tire design, after generating meshes in the design using CAD, the results are reviewed, and if it does not meet the desired performance, the design is regenerated and the mesh is divided.

However, this repetitive task has a problem of increasing the time required for the design.

The present invention has been made to solve the above problems and its purpose is to automate tire design to compare and analyze the results of various design factors to reduce the time it takes to find the optimal design and reduce the cost accordingly. The present invention provides a tire design method for predicting tire performance.

Tire design method for tire performance prediction according to the present invention for achieving the above object,

A tire design method for tire performance prediction, comprising the first step of setting a tire target performance on a computer and 2D drawing with CAD to generate a 2D mesh.

A second step of selecting a design factor and a change range of the factor in the 2D drawing; A third step of automatically changing the 2D element network in a range of change of the selected design factor and factor after the second step; A fourth step of generating a 3D mesh by rotating the changed 2D mesh in a symmetrical manner after the third step to perform an FE analysis and analyzing the analysis result; And a fifth step of determining whether the tire performance is satisfied based on the analysis result after the fourth step, and if not satisfied, perform the second step again and, if satisfied, complete the design to manufacture the tire.

Tire design method for predicting tire performance according to the present invention can reduce the time required to find the optimal design by comparing and analyzing the results of various design factors by automating the tire design can reduce the cost .

The present invention will be described in more detail based on the accompanying drawings as follows.

In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. And the following terms are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user, operator, etc. Accordingly, the meaning of each term should be interpreted based on the contents throughout the present specification. will be.

1 is a flowchart illustrating a tire design method for predicting tire performance according to the present invention.

As shown in FIG. 1, a tire design method for predicting tire performance according to the present invention includes a first step of setting a tire target performance on a computer and generating a 2D mesh by 2D drawing in CAD; A second step (ST40) of selecting a design factor and a change range of the factor in the 2D drawing after the first step; A third step (ST50) of automatically changing the 2D element network in the range of change of the selected design factor and factor after the second step; A fourth step (ST60 to ST80) of performing a FE analysis by generating a 3D mesh by rotating the changed 2D mesh after the third step in axisymmetry; And a fifth step of determining whether the tire performance is satisfied based on the analysis result after the fourth step, and if not satisfied, performing the second step ST40 again and, if satisfied, completing the design to manufacture the tire (ST90). It is characterized by consisting of ~ ST100).

First, the tire target performance is set in a computer and 2D drawing is made in CAD to generate 2D meshes (ST10 to ST30), and the design parameters and changing ranges of the factors in the 2D drawing are selected (ST40).

Next, the 2D mesh is automatically changed in the range of change of the selected design factor and factor (ST50), and the 3D mesh is generated by rotating the changed 2D mesh in axisymmetry (ST60).

In addition, FE analysis is performed based on the generated 3D element network, and the analysis results are analyzed (ST70 to ST80).

Based on the analysis result of the FE analysis result, it is determined whether the tire performance is satisfied by comparing with the tire target performance initially set in the computer. At this time, if the tire performance is not satisfactory, the design parameters and Selecting the range of change of the factor is performed in turn, and if the tire performance is satisfactory, the design is completed to manufacture the tire (ST90 to ST100).

The tire target performance may be a ground shape, stiffness, tensile strength of the cord, etc. To satisfy this performance, a basic 2D drawing is made using CAD, and a 2D mesh is generated using this.

At this point, the 2D drawing must be symmetrical and drawn according to the design criteria, which is important for automatically changing the 2D mesh.

FIG. 2 is a diagram illustrating a tire in 2D in a tire design method for predicting tire performance according to the present invention, and FIG. 3 is a diagram illustrating generation of a 2D element network based on FIG. 2.

As shown in FIG. 2, in the tire design method for predicting tire performance according to the present invention, the tire represented by 2D includes a tread, an inner liner rubber, a sidewall, a bead ring, a bead rubber, a rim cushion, a carcass, It consists of a general structure of a belt (2 layers) and a reinforcement belt (2-3 layers).

Here, the total length of the tire (OD) and the full width of the tire (SW) is a value determined according to the tire size, and the grounded portion is represented by a curve having a predetermined width (TW) and a predetermined radius (TR), and the curve is 2 to 3 Consists of dogs.

A belt curve is drawn away from the grounded portion by a certain depth, wherein the predetermined length is determined by the thickness of the tread and the reinforcing belt.

In addition, the belt is made of the same number as the grounded portion, and the width is determined by multiplying the design variable β and the radius is determined by multiplying α.

In addition, the belt point is held below a certain length at the end of the belt, and the bead point is held by adding a predetermined length to the radius of the rim.

Here, the predetermined length is a value determined by the designer.

Once the belt point and the bead point are determined, a carcass line with four Rs along the uniform carcass tension distribution is produced, and the other rubber may be produced considering the thickness.

When the 2D element network is generated based on the values shown in the above and the 2D drawing, it is represented as shown in FIG. 3. This mesh stores information about each design factor.

4 is a view showing that the design factor and information of the 2D element network is stored in the tire design method for tire performance prediction according to the present invention.

As shown in Figure 4, using the information of the stored design factor to create a virtual geometric curve internally, the nodes created on this curve can be separated by the NODE SET to easily move the node when changing the design factor In addition, the ELEMENT SET makes it easy to modify parts other than the virtual curve by using information such as the width, height, and thickness of each component.

FIG. 5 is a flowchart illustrating a third step in FIG. 1, and FIG. 6 is a diagram illustrating a 2D element network through FIG. 5.

First, the design factor selection in the tire design method for tire performance prediction according to the present invention may be selected according to the criteria applied when designing 2D drawings.

In addition, basic design factors include the radius and width of the ground plane, belt / bead point position, carcass radius, and the like as shown in FIG.

At this time, the design factor should set the range that can be changed, and how many should be selected within the range, this part is at the designer's discretion.

In other words, if a design factor (TW or TR etc) is selected and the range and number are set, the 2D mesh automatically changes according to the design criteria, and the node of the 2D mesh stores the coordinates of the design factor. When changed, each node is changed internally.

As shown in FIG. 5, a third step of a tire design method for predicting tire performance according to the present invention includes a thirty-first step ST51 of storing existing design factors and element network information; A thirty-second step (ST52) of changing the existing design factor value after the thirty-first step and generating a virtual geometric curve based on the changed factor value; A thirty-third step (ST53 to ST54) of moving the node to the virtual geometric curve after the thirty-second step and automatically adjusting the element network in consideration of dependencies between design factors; After the thirty-third step, if it is determined that the design factor value is a change of the determined range, if the change of the range is not performed, the thirty-second step ST52 is performed; To ST56).

The element network automation method automatically adjusts the element network according to the design factor change and generates several design plans according to the parameter range.

The mesh automation method first stores existing meshes because they have design factors and mesh information (coordinates, element information, element set information, node information, node set information, connectivity between elements and nodes, etc.) (ST51).

Next, the design factor to be changed is selected, the range and the value are determined by the designer, and a virtual geometric curve is generated internally by the determined design factor (ST52).

The nodes connected to the design factors are scaled to the length and then moved in an imaginary curve (ST53).

When the nodes are moved, internal nodes are moved in consideration of the dependency between design factors, and then the mesh is automatically adjusted in order according to the range determined by the design factors (ST54).

At this time, it is determined whether the design factor value is a change of the determined range, and if it is not a change of range, the existing design factor value is changed again, and a virtual geometric curve is generated based on the changed factor value, and the following is performed. The i th element network is generated (ST55 to ST56).

The modified 2D mesh is symmetrically rotated to be a 3D mesh and subjected to FE analysis. After analyzing the results of the FE analysis (earth pressure distribution, stiffness, code tension, etc.), the design is completed if there is a satisfactory solution do.

Therefore, the present invention sets the design variable using a basic mesh model, and if the design variable is changed, the mesh model of the tire is changed to mesh automation to set the range (boundary condition) of the design variable. In addition, Parametric Study analyzes various models within the range so that you can get to the performance you want faster.

1 is a flowchart illustrating a tire design method for predicting tire performance according to the present invention.

2 is a view showing a tire in 2D in the tire design method for tire performance prediction according to the present invention.

FIG. 3 is a diagram illustrating generation of a 2D element network based on FIG. 2. FIG.

4 is a view showing that the design factor and information of the 2D element network is stored in the tire design method for tire performance prediction according to the present invention.

5 is a flowchart illustrating a third step in FIG. 1.

FIG. 6 is a diagram illustrating a 2D element network through FIG. 5.

Claims (2)

In the tire design method for the tire performance prediction comprising the first step (ST10 ~ ST30) to set the tire target performance on the computer and 2D drawing in CAD to generate a 2D element network, A second step (ST40) of selecting a design factor and a change range of the factor in the 2D drawing; A third step (ST50) of automatically changing the 2D element network in the range of change of the selected design factor and factor after the second step; A fourth step (ST60 to ST80) of generating a 3D element network by axially symmetrical rotation of the changed 2D element network after the third step to perform an FE analysis and analyzing the analysis result; And Based on the analysis result after the fourth step, it is determined whether the tire performance is satisfied, and if it is not satisfactory, the second step (ST40) is performed again. Tire design method for predicting the tire performance, characterized in that consisting of (100). The method of claim 1, The third step is A thirty-first step ST51 of storing existing design factors and element network information; A thirty-second step (ST52) of changing the existing design factor value after the thirty-first step and generating a virtual geometric curve based on the changed factor value; A thirty-third step (ST53 to ST54) of moving the node to the virtual geometric curve after the thirty-second step and automatically adjusting the element network in consideration of dependencies between design factors; After the thirty-third step, if it is determined that the design factor value is a change of the determined range, if the change of the range is not performed, the thirty-second step ST52 is performed; Tire design method for predicting the tire performance, characterized in that made;

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