JP3138887B2 - How to display the constraint conditions of a structure model - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of displaying a constraint condition of a structure model, and more particularly to a constraint of a structure model for visually confirming an input state of constraint data for three-dimensional numerical analysis. Related to condition display method.

[0002]

2. Description of the Related Art In the fields of structural analysis, fluid analysis, electromagnetic field analysis, etc., general-purpose numerical analysis codes using a finite element method, a difference method, a boundary element method, and the like have been created, and high-precision analysis is possible. It has become to. Taking the preprocessor for the CAE of the mechanical system CAE of the finite element method as an example, the geometrical shape of the object to be analyzed is constructed in a computer using a graphic display in an interactive manner, the coordinate grid is generated, and the constraint condition data in the analysis is obtained. −
Input data and physical property data. In the conventional method, the analysis area itself is displayed on the graphic display, and the displayed figure is picked with a mouse or the like,
The area to which the constraint condition is added is designated, the data of the constraint condition is input, and the constraint state is displayed by symbols or coloring. In order to obtain a satisfactory solution within the calculation time by using the limited storage capacity of the computer, analysis conditions (slip and fixed constraints) are specified for the structure model in each of the XYZ directions, and the structure model The analysis requires the input of constraint conditions along physical phenomena (eg, elongation, bending, stress concentration, etc.), and such constraint conditions are specified interactively with the preprocessor.

[0003]

In the conventional method, the structure model has a complicated shape, and the symbols (or colors) of the coordinate grid points for which the constraint conditions are specified overlap on the display screen, so that the structure model is There is a case where it is difficult to understand the restrained state (FIG. 4). In the structure model of FIG. 4, for example, the constraint points 1 and 2 indicated by circles overlap and are difficult to visually identify. When the structure model has a complicated shape, the structure model is rotated and the symbols (or colors) of the constraint conditions are checked from various angles. It is difficult to confirm the input state of the constraint condition, and the input condition of the constraint condition is not noticed. The constraint condition of the generated structure model is not appropriate for the analysis of the physical phenomenon, and the simulation by the numerical analysis code is performed. -The result may not be satisfactory. An object of the present invention is to provide a numerical simulation.
It is an object of the present invention to provide a method for displaying a constraint condition of a structure model that visually confirms a constraint state of a three-dimensional structure using an application.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to combine a structure model composed of shape data and constraint condition data and display the combined model on a graphic display, and to display the shape data of a three-dimensional structure on a graphic display. This is achieved by fixing the constraint points above and continuously moving and rotating (animation display) other points that are not fixed.

[0005]

[Function] To visually confirm the input condition of the constraint condition, to continuously move and rotate the shape data (animation display), fix the constrained point of the shape data. Other unconstrained points are free to move and rotate. In the coordinate grid points of the three-dimensional structure model, the coordinate grid points for which the slip constraint is instructed are allowed to move only in the designated direction, and the coordinate grid points for which the fixed constraint is instructed are XYZ.
Does not allow movement in either direction. By continuously moving and rotating the three-dimensional structure model on the graphic display while maintaining this condition, the movement (elongation) of the shape between the constrained coordinate grid points and the free coordinate grid points, Due to the rotation, the constraint state of the three-dimensional structure model can be easily confirmed visually.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 illustrates a structure model constraint condition display apparatus according to the present embodiment. In FIG. 1, a constraint condition display device 1 for a structure model
Supports the display of constraint conditions by numerical simulation, and the structure model stored in the external storage device 6 is an operation panel 5 (for example, a mouse, a stick, a light pen, a keyboard, etc.). Are displayed on the arithmetic processing unit 4 (for example, a computer) and the display unit 2 (graphic display) via the image display control unit 3 in accordance with the display input instruction from. The displayed structure model can be moved and rotated based on an instruction from the operation panel 5. The structure model has a one-dimensional, two-dimensional, or three-dimensional shape such as a beam, a shell, or a solid. In this embodiment, a three-dimensional structure model will be described as an example.

FIG. 2 shows an execution procedure of the analysis work. << Processing Step 1 >> First, three-dimensional data including data and coordinate grid data is input from the operation panel 5 and stored in the external storage device 6. << Processing Step 2 >> Next, three-dimensional data is input from the external storage device 6, and the arithmetic processing device 4 and the image display control device 3
Is displayed on the display device 2 via. The display screen is shown in FIG. FIG. 3 shows the shape of the object to be analyzed and a coordinate grid diagram. << Processing Step 3 >> The analysis operator picks a coordinate grid point of the structure model on the screen with the mouse or the like of the operation panel 5, specifies a constraint area, and inputs in which direction XYZ is to be constrained. . << Processing Step 4 >> The input constraint condition is calculated by the arithmetic processing unit 4 and stored in the external storage device 6. The three-dimensional data with the constraint conditions is input from the external storage device 6 and displayed on the display device 2. Mark (or color) the coordinate grid points to which the constraint conditions have been added. FIG. 4 shows the display screen. FIG. 4 shows a diagram in which constraint conditions are marked on coordinate grid points. The marked number 1 indicates a constraint in the X direction, meaning that it cannot be moved in the X axis direction. Similarly, the numeral 2 indicates a constraint in the Y direction, and the numeral 3 indicates a constraint in the Z direction. Numeral 12 indicates a constraint in both the X and Y directions, and numeral 123 indicates that the constraint is in both the XYZ directions. << Processing Step 5 >> Next, the moving direction and the moving amount of the three-dimensional data are input on the operation panel 5. << Processing Step 6 >> The arithmetic processing unit 4 creates data of the display figure based on the input data of the moving direction and the moving amount. The detailed contents of the processing step 6 will be described with reference to FIG.

FIG. 8 shows a data conversion method of a method for displaying a constraint condition of a structure model according to the present invention. First, the movement direction and movement amount input in step 5 are calculated (processing step 10). Next, the coordinate grid points are checked against the constraint conditions input in step 3 (processing step 11). For the coordinate grid point to which the constraint condition is added in the collation in step 11, the movement amount is not added (processing step 12). For the coordinate grid points without the constraint conditions, the movement amount calculated in step 10 is added, and the coordinates after movement are calculated (processing step 13). By the processing step 13, the display graphic data after the movement is generated.

<< Processing Step 7 >> Display graphic data after the movement is output to the image display control device 3. The image display control device 3 displays the moved graphic data on the display device 2. FIG. 5 is a diagram illustrating a case where the three-dimensional structure is moved (extended) to the left (Y direction) while holding the constraint condition (• mark) of the coordinate grid point. This makes it possible to visually confirm that the marked point is constrained in the Y direction. FIG. 6 shows the constraint condition of the coordinate grid point (·
3D structure upward (Z direction)
FIG. FIG. 7 is a diagram illustrating a case where the three-dimensional structure is moved in the downward direction (−Z direction) while the constraint conditions (marks) of the coordinate grid points are held. In this way, the constraint state of the three-dimensional structure can be visually confirmed. Steps 5 to 7 are repeated in an arbitrary direction to check the input state of the constraint condition. << Processing Step 8 >> When the structure has a complicated shape, the viewpoint and the moving direction for displaying the graphic data are changed, and all the constraint conditions are visually checked.
Input the judgment result. If there is an input error in the constraint, the process returns to step 3 and the constraint is input again. By repeating steps 3 to 8 in this manner, it is possible to correct an input error of the constraint condition, and to input an appropriate constraint condition to the generated structure model. << Processing Step 9 >> In Step 8, all constraint conditions are visually checked, and if the constraint conditions are determined to be appropriate, analysis is performed.

As described above, in the image display, the viewpoint and the moving direction of the three-dimensional structure are changed while the constraint conditions (marks) of the coordinate grid points are kept, that is, the displacement is fixed. It is also possible to change the rotation direction of the three-dimensional structure by fixing the constraint condition of the point with respect to the rotation direction, that is, by fixing the angular displacement, whereby the rotation display (animation display) is performed. All constraint conditions can be confirmed visually.

[0011]

According to the present invention, even for a structure model having a complicated shape, the movement of an arbitrary amount of coordinates between a fixed constraint point and another point not fixed ( Growth),
By generating and displaying the rotation, the constraint state of the structure model can be easily visually confirmed. Further, by facilitating the confirmation of the constraint state, it is possible to correct an input error of the constraint condition and to give an appropriate constraint condition to the analysis of the physical phenomenon.

[Brief description of the drawings]

FIG. 1 is an embodiment of a structure model constraint condition display apparatus according to the present invention.

FIG. 2 shows an execution procedure of a method for displaying a constraint condition of a structure model according to the present invention.

FIG. 3 shows a shape and a coordinate grid diagram of a structure model.

FIG. 4 is a perspective view of a three-dimensional structure in which constraint conditions are marked on a coordinate grid.

FIG. 5 shows a leftward direction (Y direction) with the constraint point in FIG. 3 fixed.
FIG.

FIG. 6 is a view showing an upward direction (Z direction) with the constraint point in FIG. 3 fixed.
FIG.

FIG. 7 is a diagram when the constraint point in FIG. 3 is fixed and moved downward (−Z direction).

FIG. 8 shows a procedure for creating data of a display figure according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 Constraint condition display device of structure model 2 Display device 3 Image display control device 4 Operation processing device 5 Operation panel 6 External storage device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-257707 (JP, A) JP-A-3-95682 (JP, A) JP-A-2-230468 (JP, A) JP-A-63- 136258 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G06F 17/50 G06F 19/00 110 JICST file (JOIS)

Claims (2)

(57) [Claims] In analyzing a physical phenomenon using a computer, an input step of inputting a structure model including shape data and constraint condition data, and an input step of inputting a structure model using the input structure model. A shape display step of displaying a constraint state by a symbol or a color, an input step of instructing movement and rotation of the displayed structure model, and a constraint condition of the structure model based on input data of movement and rotation instructions. The method includes an operation step of generating display graphic data corresponding to data, and an image display step of continuously displaying the data generated by the operation step on a display device. A method for displaying a constraint condition of a structural model, characterized by continuously moving and rotating other points that are fixed in displacement, fixed in angular displacement, and not fixed. 2. The method according to claim 1, wherein the calculating step includes calculating a movement, a rotation direction, a movement amount, and a rotation amount based on input data of the movement and rotation instruction, and inputting a coordinate grid point. The step of checking the constraint conditions, and adding the movement amount and the rotation amount to the coordinate grid points to which the constraint conditions are added, without adding the movement amount and the rotation amount to the coordinate grid points to which the constraint conditions are added, Calculating the subsequent coordinates. A method for displaying a constraint condition of a structure model, comprising: