JPH06131422A - Analysis model preparing system - Google Patents

Abstract

PURPOSE:To simplify the input work of a mesh division value by introducing the concept of parametric design to mesh division design. CONSTITUTION:A two-dimensional CAD data processing part 120 has a function resembling the function of a normal two-dimensional CAD device and stores position information and dimensions of graphic elements inputted from an input part 110 in a prescribed form and stores a division value for mesh division in the form of a parameter and its value while interlocking with the corresponding graphic elements. Since two dimensional-three directional transformation part 130 converts the data from the two-dimensional CAD data processing part 120 into the data for the preparation of a three-dimensional graphic form, the three-dimensional graphic form prepared based on converted data by a three-dimensional data processing part 140 is sent to an analysis model forming part 150. A load condition, a restrictive condition, and physical property values are sent to the analysis model forming part 150 from the input part 110, and an analysis model subjected to mesh division is prepared based on these data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an analytic model for creating an analytic model based on input of dimensions and position information for creating a three-dimensional shape, mesh division values for mesh division, and analysis conditions. Regarding the creation system.

2. Description of the Related Art A conventional analytical model creating system of this type is a two-dimensional CAD function for inputting a two-dimensional shape, a three-dimensional CAD function for creating a three-dimensional shape from two-dimensional data, a two-dimensional shape or a three-dimensional shape. It is equipped with a mesh division function that assigns appropriate mesh division values to each figure element such as edges and arcs, and analysis condition setting functions such as load conditions and constraint conditions. The analysis model created by such a model creation system is applied to an analysis program and is used to obtain an analysis result such as the amount of deformation when a predetermined load is applied to the structure.

In the work of creating an analytical model using this type of system, it is difficult to properly set the mesh division values, and it has been necessary to perform various mesh divisions by trial and error. In that case, since the mesh division value is stored as the attribute value of the graphic element to be mesh-divided, when the division value which seems to be appropriate is input, the CAD data will be stored in a form linked with the value. It is sent to the process, an analysis model is created, the analysis is then performed, and the procedure of re-inputting the mesh division again according to the result is repeated.

[0003]

The above-mentioned work of inputting the mesh division values requires a lot of labor only for the input work in the case of a complicated shape in which the number of graphic elements for which the mesh division values have to be input increases. Therefore, the efficiency of analysis work was significantly reduced.

An object of the present invention is to simplify the work of inputting mesh division values in the above-mentioned analytical model creating system.

[0005]

In order to solve the above-mentioned problems, in the analysis model creating system according to the present invention, the mesh division value can be input as a variable, that is, a parameter, and a predetermined constant is set when this variable is set to a predetermined constant. An analysis model of is created. That is, the mesh division value can be stored as a variable in the table linked to the graphic element table that stores the data of the graphic element, and the structure in which the mesh division design is parametrically designed is realized.

[0006]

According to this structure, when the mesh division value for each graphic element is input as a parameter, the division of the mesh division can be freely changed by changing the value entered in this parameter. Then, for a specific graphic element, it is set as a variable in the form of a preset variable expression, and the value of the preset variable is input so that it is expressed in that formula. The mesh division value can be automatically set.

[0007]

As described above, the work of inputting mesh division values is simplified by introducing the concept of parametric design into the mesh division design.

[Additional Features and Advantages] Further, according to a preferred embodiment of the present invention, when the dimension of the side to be mesh-divided is corrected, the corresponding mesh division value is corrected according to the correction value. There is something to be done. According to this configuration, in the model in which the size of a certain graphic element is 100 mm at the beginning and the mesh division value corresponding to the graphic element is set to 6, when the size of the graphic element is corrected to 150 mm, it automatically corresponds to it. The mesh division value is corrected to 9. This further simplifies the task of inputting mesh division values. Further features and effects of the present invention will be apparent from the following description of the embodiments with reference to the drawings.

[0009]

FIG. 1 is a schematic block diagram of an analytical model creating system according to the present invention. This system 10
0 is the input unit 110 and the two-dimensional CAD data processing unit 120.
And a two-dimensional to three-dimensional conversion unit 130, a three-dimensional CAD data processing unit 140, and an analysis model forming unit 150,
The analysis model created by this system 100 is sent to the analysis device 200 and various analyzes are performed.

The two-dimensional CAD data processing unit 120 basically has a function similar to that of an ordinary two-dimensional CAD device, and the positional information and dimensions of the graphic element input from the input unit 110 are given in a predetermined format. It is possible to store the division value for mesh division in association with the corresponding graphic element in the form of the parameter and the value. The two-dimensional to three-dimensional conversion unit 130 is a two-dimensional CAD data processing unit 120.
The data from is converted into data for creating a three-dimensional figure. Based on this converted data, 3
The three-dimensional figure generated by the three-dimensional CAD data processing unit 140 is sent to the analysis model forming unit 150. The load condition, the constraint condition, and the physical property value are further sent from the input unit 110 to the analysis model forming unit 150, and a final mesh-divided analysis model is created based on these data.

Parametrics setting of mesh division values, which is a feature of the present invention, will now be described with reference to a simple example; each figure along with position data and dimensions of a figure element forming a figure through the input unit 110. The mesh division data corresponding to the elements is the two-dimensional CAD of this system 100.
The data is processed by the data processing unit 120 and linked to each other. For example, six graphic elements 1, 2 as shown in FIG.
When the mesh division value for each graphic element is input as a variable, that is, parametrically, after inputting the graphic consisting of 3, 4, 5, and 6, each graphic element is positioned as graphic data as shown in FIG. It is stored in the graphic information table 20 for each attribute value such as information and size. Further, the variable of the mesh division value for the graphic element is stored in the mesh division table 30 and linked to the graphic information table 20 by the pointer 40. In FIG. 3, with respect to the graphic element 1 which is a straight line, position information and its length, which include data such as the coordinate values of the start point and the end point of the straight line, and relational data defining parallel or perpendicular to other given elements in some cases, Here, "20" is stored and linked with the corresponding mesh division value variable "m1" stored in the mesh division value table by the pointer value: P1. As this mesh division variable, for example, an expression consisting of an arbitrary variable can be input, and for example, in the graphic element 5, "m3-m1" is set as the mesh division variable.

The mesh division table 30 is further provided with an area for storing the value of the mesh division variable, and the value input through the input unit 100 is stored therein. At that time, when the value of the variable is input in the case where it is expressed by the variable expression as the mesh division variable like the graphic element 5, here, the values of "m1" and "m3" are automatically input. That value is set to "2".

As described above, since the mesh division value can be stored as a parameter, the mesh section can be deformed by changing this parameter.

[Other Embodiments] FIG. 4 shows that a correction table 50 is prepared in addition to the graphic information table 20 and the mesh division table 30. The correction table 50 has an area for storing a reference dimension and a correction coefficient: k, and the graphic information table 20 and the mesh division table 30 are linked by a pointer 40. The reference dimension referred to here is the dimension before modification when the dimension of the graphic element is modified, and the correction coefficient is the ratio of the modified value and the value before modification.

For example, when the figure shown in FIG. 2 is transformed into the figure shown in FIG. 5, the dimensions of the figure elements 1 and 3 are corrected. At that time, the size before correction is “20” in the area of the reference size of the correction table corresponding to the graphic element 1.
Is stored, and the size of the graphic information table 20 is "
Correction factor: k at the stage when it was corrected from 20 "to" 40 "
In this area, "2", which is the ratio of the size of the graphic information table 20 to the reference size of the correction table, is entered. Then, the value of the division variable: m1 is doubled to be 4. Further, in preparation for the next correction, "40" is entered in the area of the reference dimension of the correction table. Similarly, the dimension of graphic element 3 is also "40".
When the value is modified from "60" to "60", the value of each table corresponding to this is automatically changed. Here, if the figure is parametrically designed, that is, if it is defined that the figure elements 1 and 2 are parallel to each other and intersect the figure element 2 at a right angle, the figure element 1 is automatically modified by modifying the dimension of the figure element 1. The size of the element 3 is also modified, and the mesh division value is also modified as described above.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an analysis model creating system according to the present invention.

FIG. 2 is a diagram showing an example of an input graphic.

FIG. 3 is an explanatory diagram of a graphic information table and a mesh division table.

FIG. 4 is an explanatory diagram of a graphic information table, a mesh division table, and a correction table in another embodiment.

FIG. 5 is a diagram showing an example of a modified figure.

[Explanation of symbols]

 100 analysis model creation system 110 input unit 120 two-dimensional CAD data processing unit 130 two-dimensional to three-dimensional conversion unit 140 three-dimensional CAD data processing unit 150 analysis model forming unit 20 figure information table 30 mesh division table 50 correction table

Claims (2)

[Claims] 1. An analysis model creating system for creating an analysis model based on input of dimension and position information for creating a three-dimensional shape, mesh division values for mesh division, and analysis conditions, An analysis model creation system system characterized in that a mesh division value can be input as a variable, and a predetermined analysis model is created when a predetermined constant is set in this variable. 2. The analytical model creating system according to claim 1, wherein, when the dimension of the side to be mesh-divided is modified, the corresponding mesh-division value is corrected according to the modified value.