JPH0281271A - Design system based on computer aid - Google Patents

Abstract

PURPOSE:To easily use design results expressed with two-dimensional pattern data for three-dimensional analysis by providing an analysis data generator which obtains three-dimensional analysis data, which has suck form that three- dimensional analysis of a design object can be executed, from design pattern data. CONSTITUTION:A three-dimensional analysis data generator 10 is provided which generates analysis data line pattern data for analysis or attribute data from two-dimensional pattern data of the designated design object. This three- dimensional analysis data generator 10 starts the generation processing of three- dimensional analysis data when a pattern processing device 3 terminates the design processing. The three-dimensional analysis data generator 10 consists of a pattern data converting part 11 and an analysis data generating part 12. The pattern data converting part 11 converts two-dimensional pattern data to three-dimensional pattern data as an oblique view in accordance with the classification of the object of two-dimensional pattern data. Thus, design pattern data consisting of a two-dimensional pattern is immediately used for three- dimensional analysis.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a three-dimensional analysis method for analyzing a designed object represented by two-dimensional design figure data similar to that obtained by projecting an object. This invention relates to a computer-aided design system capable of obtaining data.

[Prior art] Computer-aided design system (so-called CAD)
Whether it is a design product designed by a computer (system) or a design product designed by a human without the aid of a computer,
At the end of a design, analysis is often performed to determine whether the designed product satisfies predetermined usage conditions and operates without problems in the usage environment.

A well-known method such as the finite element method is applied to such an analysis, and graphic data or the like that specifies the designed object is generated so that such a method can be applied.

By the way, a CAD system is used to create design drawings according to input operations by an operator.
Therefore, the data format of graphical data representing a designed object is determined from a viewpoint suitable for displaying the designed object.

On the other hand, the data format of the graphical data representing the designed object inputted into the analysis processing device is determined not only from the viewpoint of specifying the shape but also from the viewpoint of being suitable for executing the analysis process. As a result, the data formats of graphical data regarding a designed object designed by a CAD system and graphical data for analysis by an analysis processing device for analyzing the designed object are different.

Conventionally, it has been common practice to use perspective-view three-dimensional graphic data as graphic data for analysis, and at least one or more two
No attempt has been made to use two-dimensional graphic data consisting of a dimensional projection map. Therefore, analysis of a designed object using a CAD system that obtains design results as two-dimensional graphical data cannot be performed using that data as is.

[Problems to be Solved by the Invention] For this reason, the design results of CAD systems that output two-dimensional graphical data have often been limited to two-dimensional analysis.

If three-dimensional analysis is to be performed on two-dimensional graphic data, it is necessary to convert the two-dimensional graphic data into three-dimensional graphic data. However, traditionally, such conversion
Since the D system and the analysis processing device are configured separately, there is no data consistency as described above, and the data is manually processed by the operator. Such conversion can be performed interactively using a computer, etc., but the analysis requires inputting not only the graphical data but also the type of analysis, analysis conditions, etc. , the input operation would be extremely complicated.

By the way, when it comes to parts that include parts with a constant thickness, such as sheet metal objects or block objects, for example, if you use programmable calculation processing, the thickness will be constant, so you can easily obtain analysis data for input. However, when an operator executes this, he or she must perform an input operation each time, and the operation becomes cumbersome due to the repeated input of similar data.

The present invention has been made in consideration of the above points, and focuses on the fact that many of the design results are used for analysis processing, and allows design results expressed as two-dimensional graphic data to be easily used for three-dimensional analysis. The purpose of this paper is to provide a computer-aided design system that makes it possible to

"Means for Solving the Problems" In order to solve the problems, the present invention provides designed figure data consisting of at least one or more two-dimensional figures similar to those obtained by projecting the designed object with respect to the designed object. In the computer-aided design system to be obtained, an analysis data generation device is provided that obtains three-dimensional analysis data in a format that allows execution of three-dimensional analysis of a designed object from design figure data.

[Function] Most of the conventional design systems are designed to perform only design, and are not designed to realize any further functions. However, for many designed figures, analysis is performed to determine whether the object represented by the figure sufficiently satisfies the actual usage conditions, etc. Since such analysis is for three-dimensional objects, three-dimensional analysis is preferable to two-dimensional analysis.

Therefore, in a design system that obtains design figure data consisting of two-dimensional figures, for convenient analysis, the analysis data generation device generates three-dimensional analysis data that can be immediately used by the analysis processing device from the two-dimensional figure data according to the design. Now it is generated.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Here, FIG. 1 is a block diagram showing the configuration of this embodiment, FIGS. 2 and 3 are flowcharts showing the conversion processing procedure executed by the graphic data conversion section, and FIGS. 4 and 5 are It is a route map showing before and after data conversion.

As shown in FIG. 1, this CAD system 1 includes an input device 2 consisting of a coordinate input device such as a digitizer or a so-called mouse, and a code input device such as a keyboard. , circle, etc.) and figure coordinates (numerical values indicating size, position, etc.) are inputted via this input device 2. Such input data is given to the graphic processing device 3. The graphic processing device 3 inputs input data to a built-in graphic storage section to store new data or update the already stored contents, and also inputs the shape of the designed object so that the operator can visually recognize it. It is formed from data according to the input stage and is provided to the graphic display device 4 for display.

In the case of this embodiment, the graphic processing device 3 defines the design result using a two-dimensional figure (plan view, side view, front view, etc.) on which a three-dimensional object is projected, similar to what is described in a so-called design drawing. and display it.

In addition to the general configuration in which a designed object is designed through interactive processing between an operator and the CAD system 1, in this embodiment, analysis data is generated from two-dimensional graphical data of the designed object. It has a configuration that generates analysis data such as graphic data and attribute data.

That is, as shown in FIG. 1, a three-dimensional analysis data generation device 10 is provided. This three-dimensional analysis data generation device 10
starts the three-dimensional analysis data generation process when the graphic processing device 3 finishes the design process. The three-dimensional analysis data generation device 10 includes a graphic data conversion section 11 and an analysis data generation section 12.

After determining what kind of object the two-dimensional graphic data obtained as a result of the design relates to, the graphic data conversion unit 11 converts it into the shape shown in FIG. 2 or 3, which is determined according to the type of the object. According to the conversion processing procedure, the design result 2
It converts dimensional graphic data into three-dimensional graphic data that looks like a perspective view. Note that this graphic data converter 1
In addition to the two-dimensional figure data as a design result from the figure processing device 3, conversion processing information indicating the depth direction and the absolute coordinates at which the three-dimensional figure is attached is given to 1, and this conversion processing information is also provided. The conversion process is performed using

Specifically, the two-dimensional figure data of the three-view configuration regarding the sheet metal object as shown in Fig. 4 (A) is
Converting to dimensional graphic data, or converting two-dimensional graphic data of a plan view configuration regarding a block object with a thickness of - as shown in Figure 5 (A>) into three-dimensional graphic data as shown in Figure 5 (B). It is something.

Next, the process of converting two-dimensional graphic data regarding a sheet metal object into three-dimensional graphic data will be described in detail with reference to FIG.

The graphic data conversion unit 11 extracts the coordinate values of each end point from the two-dimensional graphic data (step 100).

For example, in the case of FIG. 4 (A>), the intersections P1 to P of line segments
13. The coordinate values of PL6 to PL9, the starting point P14 of the arc, and the ending point P15 of the arc are extracted.

Thereafter, the extracted end point coordinates are grouped for each projection plane (step 101). Fig. 4 (If A>, three projection planes A1 to A3 are recognized, and the end point P for each projection plane A1 to A3 is
1 to P6, P7 to P12, and P13 to P19 are grouped. Thereafter, the graphic data converter 11 detects end points on each projection plane that are the same as end points on other projection planes, and associates end point groups between the projection planes (step 102). In the case of FIG. 4(A), by such processing, for example, the end point P4, pH, and PI3 are associated as representing the same point on the sheet metal object.

Next, the graphic data conversion unit 11 detects the ridge line indicating the plate thickness part based on the length of each ridge line, etc., and then extracts the plate thickness part based on the detected plate thickness part (step 103). In FIG. 4(A), for example, the ridge line connecting the end points P13 and PI3 is extracted as the ridge line indicating the plate thickness part, and based on this, the plate thickness part TH shown by the thick line in the figure is extracted. After extracting the plate thickness part in this way, the graphic data conversion unit 11 sets, for example, both end points of one of the ridge lines having the same length as the plate thickness part as the scanning reference position, and also sets each projection plane as the scanning reference position. The direction in which the plate thickness section is scanned is set (step 104, IQ5).

Thereafter, the graphic data converter 11 converts the coordinate values of the current scanning position on the two-dimensional figure into values on the three-dimensional figure (step 106). Note that at this time, the given depth direction information and information on the origin coordinates of the three-dimensional figure are used. It is then determined whether the scan has returned to the reference position, and if not, it is further determined whether the scan has returned to the same thickness section for the second time and is no longer in that direction. It is determined whether scanning is no longer possible (steps 107 and 108). In cases where one projection plane (for example, view A3 in Fig. 4(A)) represents both the front view and the rear view, the same plate thickness section may be scanned twice. In this case, the scanning direction is set to the opposite direction and the process proceeds to the next step 110 (step 109
). Also, even if scanning is completed in the previous scanning direction, the scanning direction is set to the opposite direction and the next step 110 is performed.
(Step 109).

On the other hand, if the scanning is not in a state where the same plate thickness part is scanned a second time and it is possible to scan in that direction, or if the scanning direction is set to the opposite direction, the scanning The position is advanced by a predetermined amount and the process returns to the three-dimensional conversion process (step 106) described above (step 110).

As a result of the judgment as to whether or not it has returned to the reference position described above, if it is determined that it has returned, it is further judged whether or not there remains an unscanned part, and if it remains, the process returns to step 104 described above and a new A reference position is set and scanning is repeated, and if no unscanned portion remains, end points corresponding to the depth direction are connected, and the series of processes is then terminated (steps 111 and 112).

For example, two end points P13 and PI3 at the upper end of the projection plane A3 in the two-dimensional figure shown in FIG. When the direction is set, the thickness part TH of the projection plane A3 is converted into a three-dimensional figure until the scanning of the thickness part TH of the projection plane A3 is completed.
When the conversion to a dimensional figure is completed, the end point P
16 and PI3 represent the same positions as the end points PIO and Pll of the projection plane A2, so from these end points side this projection plane A2
Convert the thickness of the plate into three-dimensional graphic data. When the conversion of the plate thickness on the projection plane A2 is completed, the conversion is performed on the plate thickness on the projection image 3 which also represents the back surface.

In this case, the scanning direction for this projection plane A3 is set from above to below, but at this stage, one conversion scan of the projection plane A3 has been completed, so this projection The plate thickness portion of surface A3 is scanned in the opposite direction to that described above. In this manner, when the second scan on the projection plane A3 is completed, the process proceeds to scan conversion of the plate thickness portion on the projection plane A1. In this way, when the conversion into three-dimensional graphic data for the projection plane A1 is completed, the scanning completes one cycle and returns to the reference position again. Therefore, the scanning of the plate thickness part and the conversion to three-dimensional figure data are completed, and the ridge line L1~ connecting the end points in the depth direction is completed.
L3 (see FIG. 4(B)) is formed to complete the conversion to three-dimensional graphic data.

In this way, two parts related to the sheet metal object shown in FIG.
The dimensional graphic data is converted into three-dimensional graphic data shown in FIG. 4(B).

Next, the conversion process to three-dimensional graphic data when the two-dimensional graphic data is related to a block object is performed in the third step.
This will be explained in detail with reference to the figures.

In this case, the graphic data conversion unit 11 first extracts the end points of each element from the designed two-dimensional graphic data (step 120). Then, based on the extracted end points, 3
The surface on the dimensional coordinate axis (the surface represented by the 2D figure data)
At the same time, the position of the lower surface is determined by considering the thickness of the specified block object. In other words, two planes representing the top and bottom surfaces of the block object are formed (
Steps 121.122). Thereafter, the graphic data conversion unit 11 connects the corresponding end points of the upper surface and the lower surface in the depth direction, finally forms three-dimensional graphic data, and ends the series of processing (step 123).

For example, two-dimensional graphic data (
Endpoints P20 to P27 are extracted from the top view), and based on the extracted endpoints, the graphic data consisting of the upper surface US and the lower surface LS (Fig. 5 (B
) is formed without the line LIO~L18 in ),
Thereafter, lines LIO to L18 extending in the depth direction are drawn to obtain three-dimensional graphic data regarding the block object as shown in FIG. 5(B).

Note that the graphic data converter 11 may perform hidden surface processing or the like on the three-dimensional graphic data.

The analysis data generation unit 12 performs meshing on the three-dimensional figure data obtained by the conversion by the figure data conversion unit 11 to generate analysis figure data, and also generates analysis conditions and types of analysis according to the shape of the figure. Generate analysis attribute data such as Here, meshing defines each surface from the converted three-dimensional figure data, automatically determines the number of meshings from the size of the figure on each plane, and adjusts each surface to match the number of meshings. Divide it vertically and horizontally.

Note that when the design object to be processed is a sheet metal object, the analysis data generation unit 12 performs meshing by considering a three-dimensional figure ignoring the plate thickness, and when the design object to be processed is a block object, Meshing is performed on all surfaces. Therefore, information on such analysis element types is also included in the analysis attribute data.

The analysis data (hereinafter collectively referred to as analysis figure data and analysis attribute data) obtained by the three-dimensional analysis data generation device 10 is sent to the analysis processing device 10 via a data bus.
5 or once recorded on a recording medium, the recording medium is loaded into the recording medium drive section of the analysis processing device 15 and provided to the analysis processing device 15 for analysis processing. .

Therefore, according to the above embodiment, since the CAD system includes a configuration for generating 3D analysis figure data from 2D figure data designed by the CAD system, when using the analysis processing device, The operator can immediately use and analyze the three-dimensional analysis graphic data obtained by the CAD system, making input operations easier and reducing input errors compared to the conventional method. Further, although the design system and the analysis processing device are separate and independent, by doing so, they can be organically combined, and design efficiency can be further improved.

In the above-described embodiment, a separate analysis processing device is shown, but the CAD system may also have the analysis processing function.

Furthermore, in the above embodiments, the objects to be designed are sheet metal objects and blocks, but they may be other objects, and the two-dimensional figure data may also be based on six-sided drawings or the like. Also good.

Furthermore, for objects with complex shapes, two-dimensional graphic data is often divided into parts and formed for each part. The present invention can also be applied to.

[Effects of the Invention] As described above, according to the present invention, the computer-aided design system not only generates graphic data based on design, but also generates three-dimensional analysis data, so that the data can be analyzed. It can be fed to the processing device in its original form, reducing the processing that the operator has to perform when performing analysis, allowing the analysis to be performed quickly, and reducing the accuracy of analysis results based on data errors. The decline can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the computer-aided design system of the present invention, FIGS. 2 and 3 are flowcharts showing the conversion processing procedure executed by the graphic data conversion section, and FIGS. FIG. 5 is a route map showing the contents before and after the graphic data is converted. 1... CAD system, 2... input device, 3...
Graphic processing device, 4... Graphic display device, 10... Three-dimensional analysis data generation device, 11... Graphic data conversion unit,
12... Analysis data generation unit, 15... Analysis processing device. Fig. 1 shows the overall configuration of the embodiment; Fig. 1 shows the edges of the figure data conversion process for the sheet metal object; Fig. 3 shows the edges of the figure data conversion process for the sheet metal object;
figure

Claims (1)

[Scope of Claim] In a computer-aided design system for obtaining design figure data consisting of at least one or more two-dimensional figures similar to those obtained by projecting the designed object regarding a designed object, 1. A computer-aided design system comprising an analysis data generation device that obtains three-dimensional analysis data in a format that allows three-dimensional analysis of a designed object to be performed.