JP2001350801A - Method for processing data and device for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly display an analytic result at the time of operating finite element method numerical analysis for an FEM analytic model using a three- dimensional solid element. SOLUTION: An analytic model using a three-dimensional solid element is generated in a step S11, and numerical analysis is operated for the analytic model in a step S13. A shell element being a two-dimensional plane element is generated on the surface of the analytic model generated in the step S11. Then, an analytic result related to the shell element generated in the step S12 and the node, is extracted from the analytic result obtained in the step S13 in a step S14. Then, the analytic result is displayed based on the shell element generated in the step S12 and the analytic result extracted in the step S14, in a step S15 and a step S16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a CAE system having a finite element method numerical analysis function, and more particularly to an information processing method and apparatus for displaying the analysis result.

[0002]

2. Description of the Related Art Generally, when an object to be analyzed is three-dimensional, an analyst first divides the shape of the object into three-dimensional solid elements such as tetrahedrons and hexahedrons by using a preprocessor function in a CAE system and performs finite analysis. An element method analysis model (hereinafter, FEM analysis model) is created, and a finite element method numerical analysis is performed by a solver function in a CAE system based on the data.

[0003] The analysis results (displacement, stress, strain, etc.) obtained by the finite element method numerical analysis are taken into an FEM analysis model constituted by the three-dimensional solid elements, and the post-processor function in the CAE system is used. Thus, a deformed diagram, a contour diagram, and the like are displayed to perform desired evaluation.

[0004]

However, as a recent trend, in order to perform more accurate analysis, FEM
When the number of finite elements in the analysis model becomes enormous, and especially when three-dimensional solid elements are used, it is difficult to display the analysis result on the CRT screen due to the large amount of data.
A heavy burden on the computer.

Therefore, in the finite element method numerical analysis,
In the evaluation of the analysis results, which are the most important in nature, when a deformed map / contour map is displayed on a CRT screen and a viewpoint moving operation or the like is performed on the screen, a great deal of time is required for computer processing. This has caused the efficiency of evaluation of the analysis results to be significantly reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art. In performing a finite element method numerical analysis on an FEM analysis model using three-dimensional solid elements, the analysis results can be displayed smoothly. An object of the present invention is to provide an information processing method and apparatus.

[0007]

A data processing device according to the present invention for achieving the above object has, for example, the following arrangement. That is, an analysis unit that generates an analysis model using a three-dimensional solid element and performs a numerical analysis on the analysis model, a generation unit that generates a shell element that is a two-dimensional plane element on the surface of the analysis model, Extracting means for extracting an analysis result regarding the shell element and its node generated by the means from the analysis result obtained by the analysis means; and a shell element generated by the generation means and the analysis result extracted by the extraction means. Display means for displaying an analysis result based on the information.

Further, a data processing method according to the present invention for achieving the above object includes, for example, the following steps. That is, an analysis step of generating an analysis model using three-dimensional solid elements and performing a numerical analysis on the analysis model;
A generation step of generating a shell element that is a two-dimensional plane element on the surface of the analysis model; and extracting an analysis result on the shell element and its nodes generated in the generation step from the analysis result obtained in the analysis step Extraction step, and a display step of displaying an analysis result based on the shell element generated in the generation step and the analysis result extracted in the extraction step.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the applicant of the present application has described these drawings as “submit property” in order to facilitate identification of a plurality of computer outputs (FIGS. 4 to 7, 10, 11, and 13 to 15) referred to in the present embodiment. And submit separately.

<First Embodiment> FIG. 16 is a block diagram of a data processing apparatus according to a first embodiment. Reference numeral 101 denotes a CRT for displaying information on data being processed by an application program, various message menus, and the like. ing. In the present embodiment, an analysis result is displayed by the finite element method. Reference numeral 102 denotes a video RAM (hereinafter, VR) for developing an image displayed on the screen of the CRT 101.
AM). Reference numerals 103 and 104 denote keyboards and pointing devices used for inputting characters and the like in predetermined columns on the screen, pointing to icons and buttons in a GUI, and the like. 105
Is a CPU that controls the entire apparatus.

Reference numeral 107 denotes a ROM that stores an operation processing procedure (program) of the CPU 5. This ROM1
07 stores programs related to flowcharts described later, including application programs and error processing programs related to data processing. Reference numeral 108 denotes a RAM used as a work area when the above-described various programs are executed by the CPU 105 and a temporary save area during error processing.

Reference numeral 109 denotes a hard disk drive (hereinafter, referred to as a hard disk drive).
HDD and 110 indicate floppy (registered trademark) disk drives (hereinafter referred to as FDD), respectively. The respective disks are used for storing and reading application programs, data, libraries, and the like. Also, F
CD-ROM, M instead of or in addition to DD
An optical (magnetic) disk drive such as O and DVD, a magnetic tape drive such as tape streamer and DDS, and the like may be provided. The control program executed by the CPU 105 is executed by the HDD 109 or the FDD 110 as needed.
It may be loaded into the AM 108.

Reference numeral 111 denotes a system bus (consisting of an address bus, a data bus, and a control bus) for connecting the above-described units.

FIG. 17 is a diagram showing a functional configuration for controlling the display of the finite element method analysis result according to the present embodiment. In the configuration shown in FIG. 16, the CPU 105 mainly
The functions of the CAE system 201 and the analysis result display data generation system 202 are executed.

The CAE system 201 has a finite element method numerical analysis function, and the preprocessor 201a generates an FEM analysis model 301 composed of three-dimensional solid elements. The shell element generation unit 202a of the analysis result display data generation system 202 uses the FEM analysis model 30
From 1, the shell element 303 for displaying the result is automatically generated on the surface and the cross section of the model.

On the other hand, the CAE system 201 executes a finite element method analysis on the FEM analysis model 301 by a solver function 201b, and generates an analysis result 302 using three-dimensional solid elements. The analysis result extraction unit 202b of the analysis result display data generation system 202 includes the shell element 3
An analysis result corresponding to each shell element and node stored in the storage element 03 is extracted from the FEM analysis model 301, and a shell element / node analysis result 304 is generated.

The post processor 201 of the CAE system 201 includes the shell element 303 obtained as described above.
When the analysis result is displayed by using the shell element / node analysis result 304 and the shell element generated on the surface and the cross section of the FEM analysis model, the analysis result is displayed. Also,
As the data of the analysis results, those relating to shell elements and nodes generated on the surface and cross section of the FEM analysis model, that is, shell element 303 and shell element / node analysis result 3
By holding the storage device 04 in the storage device, the required storage capacity can be reduced.

The functions of the CAE system 201 and the analysis result display data generation system 202 are as follows.
Generally implemented as software on a computer.

Next, display control of the finite element method analysis result of the present embodiment will be described with reference to FIGS.
FIG. 1 is a flowchart showing the display processing of the finite element method analysis result according to the first embodiment. FIG. 2 is a transparent perspective view of a tetrahedral secondary element as a three-dimensional solid element. FIG. 3 is a perspective view of a hexahedral secondary element as a three-dimensional solid element. FIG. 4 is a perspective view of an FEM analysis model composed of three-dimensional solid elements (tetrahedral secondary elements). FIG. 5 is a perspective view of an FEM analysis model composed of three-dimensional solid elements (tetrahedral secondary elements). FIG. 6 is a perspective view of a shell element model including shell elements (triangular quadratic elements). FIG. 7 is a perspective view of a shell element model including shell elements (triangular quadratic elements). FIG. 8 is a diagram showing a triangular quadratic element used for generating a shell element model. FIG. 9 is a diagram showing quadrilateral quadratic elements used for generating a shell element model. FIG. 10 is a diagram showing a display example of a deformed state of a shell element model including shell elements (triangular quadratic elements). FIG. 11 is a contour diagram of a shell element model including shell elements (triangular quadratic elements).

In FIG. 1, the analyst first uses the preprocessor function of the CAE system to change the shape of the object to be analyzed into three-dimensional solid elements such as tetrahedron and hexahedron shown in FIGS. Then, an FEM analysis model 10 shown in FIGS. 4 and 5 is created by dividing into the body secondary elements (step S11).

Next, with respect to the created FEM analysis model 10, the shell element generation unit 202a automatically puts the
A shell element model 20 (FIGS. 6 and 7) composed of the shell elements shown in FIGS. 8 and 9 is created (step S12). At this time, if the original three-dimensional solid element is a hexahedral element 3, a quadrilateral element 5 is created,
If the original three-dimensional solid element is a tetrahedral element 2, a shape that matches the surface shape of the original three-dimensional solid element is selected, such that a triangular element 4 is created. The shell element model 20 created in this way is the shell element generation unit 2
02a, the storage area (HDD 109, FD
D110).

Then, the solver function 2 of the CAE system 201 is applied to the original three-dimensional solid element data 10.
According to 01b, an analysis intended by the analyst is calculated (step S13). Next, from the calculation results (displacement, stress, strain, etc.) obtained by the solver function 201b,
Only data relating to the shell elements and nodes created in step S12 are extracted, and a shell element / node analysis result 304 is generated (step S14). here,
According to the instruction of the analyst, the apparatus displays only the shell element model 20 on the CRT screen (step S15). Then, as shown in FIG. 10 and FIG.
Modified view (40) displayed by the post processor of
It is possible to evaluate the analysis result such as the contour diagram (50) (step S16). Therefore, as compared with the case where the result is displayed on the three-dimensional solid element as a result, the burden on the screen display in the memory or the like of the computer is reduced, and operations such as moving the viewpoint on the screen display can be performed smoothly. .

In the case where the analysis result display processing has a function of discarding data other than data relating to shell elements and nodes in the results (displacement, stress, strain, etc.) obtained by the above calculation, the storage area of the computer In this case, the burden on holding the calculation results is reduced, so that computer resources can be effectively used.

<Second Embodiment> Next, a second embodiment will be described. In the first embodiment described above, shell elements are created for the entire surface of the FEM analysis model using three-dimensional solid elements, and corresponding analysis result data is obtained. On the other hand, in the second embodiment, a shell element is created for an area designated to present an analysis result (referred to as a result display area), and the corresponding analysis result data is obtained, whereby data used for display is displayed. Further reduce the volume. Hereinafter, the second embodiment will be described with reference to FIGS. Since the configuration of the information processing apparatus according to the second embodiment is the same as that of the first embodiment (FIGS. 16 and 17), illustration and description are omitted here.

FIG. 12 is a flowchart for explaining the display processing of the finite element method analysis result according to the second embodiment.
FIG. 13 is a cross-sectional view of a shell element model composed of shell elements (triangular quadratic elements) displaying an analysis result. FIG.
FIG. 4 is a diagram showing a deformation of a cross section of a shell element model composed of shell elements (triangular quadratic elements). FIG. 15 is a contour diagram of a cross section of a shell element model composed of shell elements (triangular quadratic elements).

First, the analyst determines the shape of the object to be analyzed by CAE.
Using the preprocessor function 201a in the system 201, the FEM analysis model 10 is created by dividing into three-dimensional solid elements (tetrahedral secondary elements in the present embodiment) such as tetrahedrons 2 and hexahedrons 3 as shown in FIG. (Step S2
1). Next, the analyst uses the solver 201b of the CAE system for the data of the three-dimensional solid element,
The intended analysis is calculated (step S22).

Subsequently, the analyst operates the CAE system 20.
1 solver 201b (displacement,
When evaluating stress, strain, etc. on the CRT screen, first, as shown in FIG. 13, the area where the analyst desires to display the result (the surface of the FEM analysis model composed of three-dimensional solid elements) (Step S2)
3). The shell element generation unit 202 of the second embodiment automatically generates the shell element model 3 for the specified area.
0 is generated (step S24). The three-dimensional solid element is stored in the storage area of the computer (HDD 109 or FDD).
110).

The shell element created at this time is a quadrilateral element 5 if the original three-dimensional solid element is a hexahedral element 3.
Is created, and if the original three-dimensional solid element is a tetrahedral element 2, a shape that matches the surface shape of the original three-dimensional solid element is selected, such that a triangular element 4 is created.

Subsequently, from the result (displacement, stress, strain, etc.) obtained by the calculation in step S22, data on the shell element and the node created in step S24 is extracted, and the shell element / node analysis result is obtained. 304 is generated (step S25).

Next, only the shell element model 30 is displayed on the CRT screen by the post processor 201c of the CAE system 201. As a result, for example, a modified diagram (60) or a contour diagram (70) as shown in FIGS.
It is possible to evaluate the analysis results such as (Step S
26). Alternatively, the start point is moved in accordance with the operation of moving the start point of the result display corresponding to the desired evaluation (step S2).
7). Here, the data used for the display is in step S2.
4 is a result of analysis on the shell elements and nodes generated in step 4, the load on the screen display in the memory or the like of the computer is smaller than when displaying the result on the three-dimensional solid element, and the viewpoint on the screen display Operations such as movement can be performed smoothly.

Further, the process returns to step S23 every time the analyst changes the designation of the area for displaying the result, thereby generating the shell element (step S2).
3, S24) and the process of reading the result into the shell element (step S25) are updated, so that the analyst can use the FEM.
It is possible to change the display on the CRT screen of a deformation diagram, contour diagram, or the like at an arbitrary surface or cross-sectional position of the analysis model.

As described above, according to the above embodiments,
Since the analyst can display only the shell element on the CRT screen and evaluate the analysis result of the deformation diagram, contour diagram, etc., as a result, the result is displayed more than when displaying the result on the three-dimensional solid element. Thus, the burden on the screen display in the memory or the like of the computer is reduced, and operations such as moving the viewpoint on the screen display can be performed smoothly.

In each of the above embodiments, the results (displacement, stress, strain, et
In c.), if the data other than the data related to the shell element and the node is configured to be discarded, the burden of holding the calculation result in the storage area of the computer is reduced, and the computer resources are effectively used. It becomes possible.

According to the second embodiment, each time the analyst changes the designation of the area for displaying the result, the step of generating the shell element and the step of reading the result into the shell element are updated. For this reason, the analyst must use the CEM for deformation diagrams and contour diagrams at arbitrary surface and cross-sectional positions of the FEM analysis model.
The display on the RT screen can be changed.

The present invention may be applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.) or may be applied to an apparatus composed of one device.

Further, an object of the present invention is to provide a storage medium (or a recording medium) recording a program code of software for realizing the functions of the above-described embodiments to a system or an apparatus, and to provide a computer (a computer) of the system or the apparatus. It is needless to say that the present invention can also be achieved by a CPU or an MPU) reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention. Also,
When the computer executes the readout program code, not only the functions of the above-described embodiments are realized, but also the operating system (OS) running on the computer based on the instructions of the program code.
It goes without saying that a case where the functions of the above-described embodiments are implemented by performing some or all of the actual processing, and the processing performs the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the program code is read based on the instruction of the program code. Needless to say, the CPU included in the function expansion card or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0038]

As described above, according to the present invention, when a finite element method numerical analysis is performed on an FEM analysis model using a three-dimensional solid element, the analysis result can be displayed smoothly.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a display process of a finite element method analysis result according to a first embodiment.

FIG. 2 is a perspective view of a tetrahedral secondary element as a three-dimensional solid element.

FIG. 3 is a perspective view of a hexahedral secondary element as a three-dimensional solid element.

FIG. 4 is a perspective view of an FEM analysis model including three-dimensional solid elements (tetrahedral secondary elements).

FIG. 5 is a perspective view of an FEM analysis model including three-dimensional solid elements (tetrahedral secondary elements).

FIG. 6 is a perspective view of a shell element model including shell elements (triangular quadratic elements).

FIG. 7 is a perspective view of a shell element model including shell elements (triangular quadratic elements).

FIG. 8 is a diagram showing a triangular quadratic element used for generating a shell element model.

FIG. 9 is a diagram showing quadrilateral quadratic elements used for generating a shell element model.

FIG. 10 is a diagram showing a display example of a deformed state of a shell element model including shell elements (triangular quadratic elements).

FIG. 11 is a contour diagram of a shell element model composed of shell elements (triangular quadratic elements).

FIG. 12 is a flowchart illustrating a display process of a finite element method analysis result according to the second embodiment.

FIG. 13 is a cross-sectional view of a shell element model composed of shell elements (triangular quadratic elements) displaying an analysis result.

FIG. 14 is a diagram showing a deformation of a cross section of a shell element model composed of shell elements (triangular quadratic elements).

FIG. 15 is a contour diagram of a cross section of a shell element model including shell elements (triangular quadratic elements).

FIG. 16 is a block diagram illustrating a configuration of a data processing device according to the first embodiment.

FIG. 17 is a diagram illustrating a functional configuration for display control of a finite element method analysis result according to the present embodiment.

Claims (9)

[Claims] An analysis means for generating an analysis model using three-dimensional solid elements and performing a numerical analysis on the analysis model; and a generation means for generating a shell element which is a two-dimensional plane element on a surface of the analysis model. Extracting means for extracting, from the analysis result obtained by the analyzing means, an analysis result relating to the shell element generated by the generating means and its node; and extracting the shell element generated by the generating means and the extracting means. A data processing device comprising: a display unit configured to display an analysis result based on the analysis result. 2. The data processing apparatus according to claim 1, wherein the generation unit generates a shell element on an outer surface or a cross section of the analysis model. 3. The apparatus according to claim 1, further comprising designating means for designating a desired surface in the analysis model, wherein the creating means creates a shell element for the surface designated by the designating means. The data processing device according to claim 1. 4. The apparatus further comprises: a holding unit for holding the shell element generated by the generation unit and the analysis result extracted by the extraction unit; and a discarding unit for discarding the analysis result obtained by the analysis unit. The data processing device according to claim 1, wherein 5. An analysis step of generating an analysis model using three-dimensional solid elements and performing a numerical analysis on the analysis model; and a generation step of generating a shell element that is a two-dimensional plane element on the surface of the analysis model. An extraction step of extracting an analysis result regarding the shell element and its node generated in the generation step from the analysis result obtained in the analysis step; and a shell element generated in the generation step and extracted in the extraction step. A display step for displaying an analysis result based on the analysis result. 6. The data processing method according to claim 1, wherein the generating step generates a shell element on an outer surface or a cross section of the analysis model. 7. The method according to claim 1, further comprising a designation step of designating a desired face in the analysis model, wherein the generation step generates a shell element for the face designated in the designation step. Data processing method described. 8. A storage step for holding a shell element generated in the generation step and an analysis result extracted in the extraction step in a memory, and a discarding step for discarding the analysis result obtained in the analysis step. 4. The data processing method according to claim 1, wherein: 9. A storage medium storing a control program for causing a computer to perform an analysis process by a finite element method, wherein the control program generates an analysis model using three-dimensional solid elements, and generates a numerical value for the analysis model. The code of the analysis step for performing the analysis, the code of the generation step for generating a shell element which is a two-dimensional plane element on the surface of the analysis model, and the analysis result on the shell element generated in the generation step and its nodes A code of an extraction step to be extracted from the analysis result obtained in the analysis step, and a code of a display step of displaying an analysis result based on the shell element generated in the generation step and the analysis result extracted in the extraction step And a storage medium comprising: