JPH0981543A - Method and device for zooming analysis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the method and device for zooming stress analysis which efficiently analyze a partial area with a high precision by simple operation. SOLUTION: An input/output device 105 which inputs not only the entire shape and the analysis condition of an analysis object but also a partial shape requiring high-precision analysis, an interactive data input/output processing part 101 which performs input in an interactive form, an entire analysis processing part 102 which automatically generates a finite element model of the entire shape in accordance with the inputted entire shape and analysis condition of the analysis object to perform entire analysis, a partial analysis processing part 103 which automatically generates a finite element model of the partial shape to perform partial analysis, and a common data base 104 where processing results of respective parts are stored are provided. At the time of analysis of the partial shape, the analysis condition is automatically generated based on the analysis condition of the entire shape or the analysis result of the entire analysis processing part to analyze the partial shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zooming analysis apparatus and method using a finite element method, and more particularly to a zooming analysis apparatus and method for highly accurately analyzing a partial region of a shape to be analyzed.

[0002]

2. Description of the Related Art Conventionally, when an analysis simulation of an analysis target shape is performed by using the finite element method, it is possible to analyze not only the entire analysis target but also a partial region of the analysis target shape where stress is concentrated. Although generally used, the following two methods are already known as methods for more accurately calculating the partial region of the shape to be analyzed using the finite element method according to the present invention.

One of them is a method of giving a sparse / dense distribution to the finite element mesh of the entire analysis area of interest, and improving the analysis accuracy in the area by finely dividing the mesh of the area to be calculated with high accuracy. It is a method to plan. In this method, a user who performs analysis predicts a region to be calculated with high accuracy based on analysis knowledge and experience, and creates a fine mesh there. However, if it is difficult to accurately predict the area to be calculated, the entire analysis area is divided into uniform meshes for analysis, and after analysis is performed, the analysis result is judged and the mesh density is changed. Is done. Furthermore, there is also known a method of calculating an analysis error from the analysis result by such a method and automatically controlling the density of the mesh according to the analysis error. This analysis method is called adaptive mesh analysis. .

Another method is to prepare a finite element mesh for the entire analysis area and a finite element mesh for a portion to be calculated with high accuracy, and to calculate the boundary of the latter finite element mesh from the analysis result calculated by the former finite element mesh. This is a method in which a condition is generated, and only the part that needs to be calculated with high accuracy is calculated again. Here, by making the latter finite element mesh finer than the former finite element mesh, the analysis accuracy is improved, and hereinafter, such an analysis method is referred to as zooming analysis.

Regarding the above two methods, for example, a mechanical CAE software "AN" manufactured by Cybernet Systems Co., Ltd.
It has already been realized in "SYS", and its details are described in the product catalog of the system.

[0006]

However, in the conventional analysis method as described above, in particular, in the method of performing the analysis by providing the finite element mesh of the entire analysis target with the coarse / fine distribution, in the case of the three-dimensional analysis, Requires a great amount of labor and time for the user to perform mesh division work in the analysis area, and also when the adaptive error is automatically determined and the adaptive mesh is generated, analysis of the entire analysis area is executed multiple times. However, there is a problem that it takes time for analysis.

On the other hand, in the method using the finite element mesh of the whole area and the finite element mesh of the partial area, the analysis time is shorter than that of the analysis using the adaptive mesh, however, the user can There was a problem in terms of usability that the user had to re-input the boundary conditions given to the finite element mesh of when the partial region was analyzed. Further, in such a conventional analysis method, when the ratio of the element size of the finite element mesh of the entire region to the element size of the finite element mesh of the partial region is large, the boundary condition of the partial region is automatically calculated from the analysis result of the entire region. There is a problem that an error occurs in the process of generating, and as a result, the analysis accuracy of the partial region deteriorates.

The present invention has been made in order to solve the above problems in view of the problems in the prior art as described above, and an object of the present invention is to analyze a partial region which requires analysis accuracy with high accuracy. Another object of the present invention is to provide a zooming analysis device and an analysis method thereof that can be performed in a short time.

[0009]

According to the present invention, first,
It is a device for analysis simulation that inputs the shape model of the analysis target and the data of the analysis conditions and outputs the data of the analysis calculation result.For a part of the entire shape of the analysis target,
A zooming analysis device capable of performing analysis with a finite element model having higher accuracy than the analysis accuracy of the overall shape, and means for inputting the overall shape of the analysis target and its analysis conditions;
Means for inputting the partial shape that requires highly accurate analysis; a finite element model of the overall shape is automatically generated from the input overall shape model of the analysis target and its analysis conditions, and the whole analysis is performed. And, based on at least one of the analysis conditions of the overall shape of the analysis target and the analysis result of the overall analysis by the overall analysis means, in addition to the input partial shape, the partial shape automatically. And a means for performing a partial analysis by generating a finite element model of the above.

Further, according to the present invention, there is provided a zooming analysis device capable of performing an analysis simulation on a part of the entire shape to be analyzed by a finite element model having a higher accuracy than the analysis accuracy of the entire shape, At least an input / output device for inputting the entire shape of the analysis target and its analysis conditions, and the partial shape for which high-precision analysis is required, and outputting data of analysis calculation results; An overall analysis processing unit that automatically generates a finite element model of the overall shape from the overall shape and its analysis conditions and performs an overall analysis; the partial shape based on the input partial shape and the analysis conditions. A partial analysis processing unit for automatically generating a finite element model of the above and performing partial analysis; and, being connected in common to the overall analysis processing unit and the partial analysis processing unit, at least the overall solution And a database unit for storing the analysis result of the entire analysis by the finite element model of the entire shape to be executed by the processing unit's - timing analyzer is proposed.

Further, according to the present invention, as a means for achieving the above-mentioned object, the analysis simulation for inputting the shape model to be analyzed and the analysis condition data and outputting the analysis calculation result data is also provided. A method, which is a zooming analysis method capable of performing analysis by a finite element model having a higher accuracy than the analysis accuracy of the entire shape for a part of the entire shape of the analysis target, for executing the analysis of the entire shape. When inputting the analysis target overall shape and its analysis conditions and analyzing a partial shape that requires high-precision analysis, based on the analysis condition of the input analysis target overall shape, or the analysis result executed, A zooming analysis method for analyzing a partial shape is proposed.

That is, in the above-described zooming analysis apparatus or zooming analysis method according to the present invention, the user inputs the shape model and analysis conditions of the entire analysis target using an input device such as a mouse or a keyboard, and then displays on the screen. Simply specify the partial shape you want to analyze in detail from the displayed overall shape model, and instruct execution of analysis calculation.
When performing analysis for partial shapes that require highly accurate analysis, based on the analysis conditions of the entire analysis target that has already been input, or the analysis results that have been executed for the entire analysis target shape, automatically, Since it is possible to generate a partial shape finite element model and perform partial analysis,
It is possible to obtain a zooming analysis apparatus and an analysis method that can perform analysis of a partial area that requires analysis accuracy with high accuracy and in a short time, and that is easy to use.

Further, according to the analyzing apparatus for carrying out the zooming analyzing method of the present invention shown in the embodiments of the present invention which will be described in detail below, the shape of the entire analysis target and the data of the analysis conditions, and in detail, An interactive data input / output processing unit that inputs data of a partial shape to be analyzed and outputs data of an analysis result to an output device; a finite element model of the entire analysis target from the shape of the entire analysis target and data of analysis conditions. An overall analysis processing unit that generates data and analyzes the entire analysis target; a part from the data of the partial shape to be analyzed in detail, the analysis condition data of the entire analysis target, and the analysis result data of the entire analysis target A partial analysis processing unit for generating a finite element model of the shape and performing detailed analysis of the partial shape; calculated in the overall analysis processing unit and the partial analysis processing unit In an analysis simulation device including an analysis result display processing unit that displays analysis result data: a boundary portion of a partial shape to be analyzed in detail, a boundary portion included inside the entire analysis target shape and a boundary between the entire analysis target shape. A means for automatically classifying into a boundary part that matches with is provided.

Furthermore, in the process of generating the finite element model of the entire analysis target, the finite element size in the vicinity of the boundary portion included in the inside of the entire analysis target shape classified by the means is automatically reduced. Means were provided. Furthermore, in the process of generating the finite element model of the sub-shape to be analyzed in detail, the boundary condition data is generated from the analysis result data of the whole analysis for the boundary part of the sub-shape included in the analysis target whole shape. And means for inheriting the boundary condition data given to the overall shape for the boundary portion of the partial shape that matches the boundary of the overall shape to be analyzed.

According to the embodiment of the present invention, it is desired to input the shape model of the entire analysis target and its analysis conditions via an input device such as a mouse or a keyboard, and to perform detailed analysis from the entire shape model. When the partial shape is specified, first, in the computer, the boundary line (in the case of three-dimensional case, the boundary surface) forming the boundary portion of the partial shape model is located in the entire shape model from the entire shape model and the data of the partial shape model. It is determined whether or not, and the determination result is described as the attribute information of the boundary line (boundary surface). Next, a finite element model of the entire analysis target is generated from the shape model of the entire analysis target and the analysis conditions, and the analysis calculation is executed. At this time, a finite element having a small element size is generated near the boundary of the partial shape model included in the shape model of the entire analysis target.
Finally, a finite element model of the partial shape is generated from the partial shape model, the analysis conditions given to the entire shape model, and the result of the overall analysis, and the analytical calculation is executed. At this time, for the boundary of the partial shape model included in the whole shape model, the boundary condition is automatically generated from the result of the whole analysis, while the boundary of the partial shape model that matches the boundary of the whole shape model Is made to inherit the boundary condition given to the whole shape model. From the above, the ratio of the element size of the finite element model of the overall shape to the element size of the partial shape model in the area where the boundary condition is generated from the result of the overall analysis becomes small, so that the accuracy of generating the boundary condition improves and Accordingly, the analysis accuracy of the partial shape is also improved.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. (1) Overall System Configuration: FIG. 1 is an overall system configuration diagram showing an example of an embodiment of a zooming analysis device according to the present invention. In the figure, the overall system is such that the user inputs the shape model of the entire analysis target and the data of the analysis conditions, and further the data of the partial shape model to be analyzed in detail by the interactive operation with the computer, or An interactive data input / output processing unit 101 for displaying the data of the analysis result on the output device, an overall analysis processing unit 102 for generating and analyzing a finite element model for the entire analysis target, and a partial shape to be analyzed in detail. A partial analysis processing unit 103 for generating and analyzing a finite element model, a shape model, an analysis condition, a finite element model and data of an analysis result are stored,
It comprises a common database 104 for transferring data between the respective processing units (101, 102, 103) and an input / output device 105 including a keyboard, a mouse, a display and the like. Each of these processing units (1
01, 102, 103) are constituted by, for example, a computer.

In the configuration of the entire system, the user first selects a command of the interactive data input / output processing unit 101 via the input / output device 105 such as a keyboard, a mouse, and a display, and makes an input required by the command. Input parameters, data of the shape model of the entire analysis target, analysis condition data for the entire shape model,
Input the data of the partial shape model to be analyzed in detail. Here, these various types of input data are stored in the common database 104. In addition, the user
When a command for executing the analysis of the interactive data input / output processing unit 101 is selected, the interactive data input / output processing unit 101 causes the overall analysis processing unit 102 and the partial analysis processing unit 10 to operate.
3 and 3 are sequentially activated, whereby the analysis processing is performed. It is also possible to input the data of the partial shape model to be analyzed in detail above after first analyzing the entire analysis target.

In the analysis process, the overall analysis processing unit 102 inputs the data of the shape model of the entire analysis target and the data of the analysis condition for the entire shape model from the common database 104, and the finite element model of the entire analysis target. And the analysis result data of the overall analysis are stored in the common database 104. Further, the partial analysis processing unit 103, from the common database 104, data of a partial shape model to be analyzed in detail, data of analysis conditions for the entire shape model, data of a finite element model of the entire analysis target, and The data of the analysis result of the overall analysis by the overall analysis processing unit 102 is input, and the data of the finite element model of the partial shape to be analyzed in detail and the data of the analysis result of the partial analysis are input to the common database. It is stored in 104. When the analysis process is completed, thereafter, the interactive data input / output processing unit 10
Inputs the analysis result data of the partial analysis from the common database 104, and displays the analysis result on the display of the input / output device 105.

Next, details of the interactive data input / output processing unit 101 described above will be described with reference to FIG. As shown in the figure, the interactive data input / output processing unit 101 includes a shape model definition unit 201 and an analysis condition definition unit 2
02, partial shape model definition unit 203, analysis execution unit 20
4 and the analysis result display unit 205. First, the shape model definition unit 201 creates data of the shape model of the entire analysis target, and stores the created data in the common database 104. Analysis condition definition unit 20
In step 2, data of analysis conditions such as constraint conditions, load conditions, and material conditions are created for the geometric model of the entire analysis target, and then they are stored in the common database 104. Further, the partial shape model definition unit 203 defines a partial area to be analyzed in detail in the entire analysis target, and stores this in the common database 104 as data of the partial shape model. Here, when the partial shape model is defined, graphic calculation processing is performed between the entire shape model and the partial shape model, which will be described in detail later. In the analysis execution unit 204, the element size of the finite element model of the overall analysis, the element size of the finite element model of the partial analysis, and the maximum element size ratio of the area where the boundary condition of the partial analysis is generated are input, and FIG. The overall analysis processing unit 102 and the partial analysis processing unit 103 shown in FIG. Finally, the analysis result display unit 205 performs a process of extracting the analysis result data of the partial analysis from the common database 104 and displaying it on the display.

FIG. 3 shows the details of the overall analysis processing unit 102. As shown in the figure, the overall analysis finite element mesh generation unit 301, the overall analysis analysis condition generation unit 302, and , And an overall analysis calculation unit 303. Then, in the finite element mesh generation unit 301 for overall analysis, element division is performed based on the element size of the finite element model of overall analysis input by the analysis execution unit 204 (FIG. 2) of the interactive data input / output processing unit 101. However, in the vicinity of the boundary part of the analysis partial shape model included in the entire shape model, the ratio with the element size of the finite element model of the partial analysis is the maximum element size ratio specified by the analysis executing unit 204. The element dimensions are adjusted so as not to exceed.
Further, in the analysis condition generation unit 302 for the overall analysis, the analysis condition defined for the shape model in the analysis condition definition unit 202 of FIG. 2 is inherited to the finite element mesh for the overall analysis. Then, in the overall analysis calculation unit 303, the data of the finite element model generated in the overall analysis finite element mesh generation unit 301 and the overall analysis analysis condition generation unit 302 are input, and the finite element analysis is performed, and the analysis is performed. The resulting data is stored in the common database 104.

Further, FIG. 4 shows the partial analysis processing unit 1 described above.
03 is shown in detail, and as shown in the figure, it is composed of a partial analysis finite element mesh generation unit 401, a partial analysis analysis condition generation unit 402, and a partial analysis calculation unit 403. In such a configuration, the finite element mesh generation unit for partial analysis 401 performs element division based on the element size of the finite element model of partial analysis input by the analysis execution unit 204 shown in FIG. Next, in the analysis condition generation unit for partial analysis 402, for the boundary part of the partial shape model that coincides with the boundary part of the overall shape model, the boundary defined for the overall shape model in the analysis condition definition unit 202 of FIG. The conditions are inherited to the finite element mesh for partial analysis, and regarding the boundary part of the partial shape model included inside the overall shape model, the analysis result of the overall analysis calculated by the overall analysis calculation unit 303 in FIG. Boundary condition data of the finite element mesh for partial analysis is generated from the data. Then, in the partial analysis calculation unit 403,
The finite element model data generated in the partial analysis finite element mesh generation unit 401 and the partial analysis analysis condition generation unit 402 are input, finite element analysis is performed, and the analysis result data is stored in the common database 104. To do.

(2) Expression method of shape model and analysis conditions:
Next, a method of expressing the shape model to be analyzed and the analysis conditions in the zooming analysis apparatus whose internal system configuration is shown above will be described below. Of course, the shape model representing the analysis target area is 3 in the case of the three-dimensional model.
Represented by a set of shape elements consisting of point elements, line elements, surface elements, and solid elements in a two-dimensional space, and in the case of a two-dimensional model, shape elements consisting of point elements, line elements, and surface elements in a two-dimensional space , But the case of a two-dimensional model will be described as a specific example.

First, the two-dimensional shape model G1 shown by the shaded area in FIG. 5 has one surface element F1, five line elements E1, E2, E3, E4 and E5, and five point elements V1. As a set having V2, V3, V4, and V5 as elements, it is represented by the following formula.

[Equation 1] Further, as the phase information between the shape elements, for example, the five line elements E1, E2, E3, E4, E5 may be used.
Describes so-called boundary expression information such as constituting a boundary of the surface element F1. Further, as geometric information of each shape element, information of equations describing coordinate values of points and line shapes is described.

On the other hand, the information on the analysis conditions is defined for the shape elements that make up the above-described shape model. For example, as shown in FIG. 5, material conditions, constraint conditions, or load conditions are defined for the shape model described by each shape element as shown in FIG. In the case of the example of this figure, the material condition is described as the attribute information of the surface element F1, and the load condition and the constraint condition are the line element E5 and the line element E, respectively.
It is described as the attribute information of 1, E3.

Following the method of expressing the shape model of the entire analysis target and its analysis conditions described above with reference to FIGS. 5 and 6,
Next, a method of inputting a partial shape model to be analyzed in detail and a method of expressing the partial shape model in the computer will be described. That is, in the case of two-dimensional, the representation method of this partial shape model is a square, a rectangle, a circle, a sector, etc.
In the case of three dimensions, it is performed by superimposing a primitive shape model such as a rectangular parallelepiped, a cylinder or a sphere on the overall shape model.

This will be explained using the shape model shown in FIG. 5 as well. As shown in FIG. 7, the primitive of a square 702 is added to the shape model 701 of the entire analysis target displayed on the screen by the user. This is done by superimposing different shape models on the overall shape model. The partial shape model to be analyzed in detail is input in this way, but the actual analysis area is the entire shape model 701 and the primitive shape model 702 as shown by the hatched portion 703 in FIG. Are overlapped areas.

As described above, in the primitive shape model input by the user when the partial shape model to be analyzed in detail is input, as shown by the hatched portion 703 in FIG. 7, these are overlapped in the actual analysis area. However, this actual analysis region can also be described in the same manner as the above-described representation method of the shape model, as shown in FIG. In this case, the primitive shape model G2 is represented by the following equation.

[Equation 2] Then, when the overall shape model and the primitive shape model are determined in this way, next, the partial shape model to be the analysis region is obtained by the graphic operation shown in FIG.

Here, it is assumed that the overall shape model G1 and the primitive shape model G2 are respectively expressed by the following equations,

(Equation 3)

(Equation 4) Assuming that the partial shape model to be obtained is G3, first, G3 is set to an empty set (step S10), then i is started from 0 (step S11), and 1 is added to this i (step S12). Similarly, with respect to j, first, 0 is started (step S13), and then 1 is added to this j (step S14). That is, these i and j are started from 1 and their values are sequentially increased.

After the above processing, in this graphic calculation processing,
With respect to the shape element gi forming G1 and the shape element fj forming G2, a product set operation for obtaining a common area between them is performed (step S15). And the result (gi ∩
fj) is added to the set of G3 (step S16). Further, as represented by the following equation, (gi∩fj) is
Information that is included in both gi and fj is described (step S17).

(Equation 5)

(Equation 6) The above process is repeated for all combinations of the shape elements forming G1 and the shape elements forming G2, that is, the above j and i become m and n, respectively (step S18 and Step S1
9), the figure calculation is completed.

FIG. 10 shows an example of the partial shape model to be analyzed as a result of performing the above-described graphic calculation processing on the whole shape model of FIG. 5 and the primitive shape model of FIG. There is. In the illustrated example, the line element E13 (= F1∩E9) is calculated by the calculation of the surface element F1 and the line element E9, and the point element V12 (= E
2∩E8) is an element obtained by calculation of the line element E2 and the line element E8, and these are the partial shape model G to be obtained.
3 shape elements. Further, in the process of the above graphic operation, since the inclusion relation between the shape element of the desired partial shape model G3 and the shape elements of the overall shape model G1 and the primitive shape model G2 is described, the shape element of G3 is the overall shape. Which shape element of the model G1 is included can be easily searched.

Further, in the example of FIG. 10, the line element E12 and the line element E13 are included in the surface element F1. That is, they are located inside the overall shape model. On the other hand, the line element E10 and the line element E11 are respectively the line element E1
And line element E2, which are located at the boundary of the overall shape model. Therefore, the position of the boundary of the partial shape model in the overall shape model can be classified by the above-described graphic calculation.

(3) Generation method of finite element model for overall analysis: Next, a method of generating a finite element mesh for the analysis target in which the shape model is set and expressed as described above, in particular, for the overall shape model. Is shown with reference to FIG. In this method for generating a finite element mesh, first, an overall shape model (shaded area) to be an analysis region as shown in FIG. 11A and an element size of a finite element mesh for analysis are input, and then As shown in FIG. 11B, a plurality of nodes are arranged at the boundary of the input overall shape model so that the node intervals are close to the given element dimensions. These nodes are indicated by "●" in the figure. Next, as shown in FIG. 11C, nodes are similarly arranged inside the overall shape model. Finally, as shown in FIG. 11 (D), a boundary portion of the overall shape model is connected to a plurality of nodes arranged inside to sequentially generate triangular elements which do not overlap with each other. Here, as a method of generating a triangular element or a tetrahedral element from a group of nodes arranged in a two-dimensional plane or a three-dimensional space, for example, the Delaunay method or the like can be used.

In addition to the above-described method, the finite element mesh generation method according to the present invention is such that, in the boundary portion of the partial shape model included in the inside of the overall shape model, the node intervals are denser than in other areas. It is also possible to arrange the nodes so that, and an algorithm for generating a finite element mesh for overall analysis in such a case is shown in FIG. As is clear from the figure, also in this method for generating a finite element mesh, first, the overall shape model (shaded area) to be the analysis region and the element size of the finite element mesh for analysis are input (step S21), and then , A plurality of nodes are arranged in the boundary portion of the input overall shape model so that the node intervals are close to the given element dimensions (step S
22). Next, nodes are similarly arranged inside the overall shape model (step S23). Then, the nodes are arranged in the vicinity of the boundary portion of the partial shape model included in the inside of the overall shape model (step S24). At this time, with respect to the boundary portion of the partial shape model included inside, the node interval is the entire shape. Arrange the nodes so that they are denser than the area of. Finally, the boundary portion of the overall shape model and the plurality of nodes arranged inside are joined to sequentially generate triangular elements (or tetrahedral elements) that do not overlap each other (step S25), and the process ends.

As described above, in the present invention, the finite element model for overall analysis is generated. However, as in the former, the element division method is used in which the partial shape model is not considered. On the other hand, as in the latter, the partial shape model is generated. 13 and FIG. 14 show examples of the finite element model for overall analysis generated by dividing the elements by each method. That is, FIG. 13 is a division example in which element division is performed without considering the partial shape model.
Sets a partial shape model to a part of the whole shape model,
This is an example of element division in consideration of this partial shape model.

The analysis conditions in the case of overall analysis are inherited to the overall analysis finite element mesh generated above, with the analysis conditions input for each shape element of the overall shape model. For example, using FIG. 6 as an example, the material conditions already defined for the surface element F1 are inherited for all the formed finite elements. Also, the line element E
From the constraint conditions input for 1 and the line element E3, the nodes located on the line element E1 and the line element E3 are constrained under the same condition. Further, the load condition input to the line element E5 is assigned as a distributed load to the nodes located on the line element E5.

(4) Generation method of finite element model for partial analysis: Furthermore, generation of finite element mesh for partial analysis
Using the element dividing method shown in FIG. 11, the entire element is uniformly generated to have the element size input by the user. FIG.
5 shows an example of generating a finite element mesh for such partial analysis. In this case, the analysis conditions for the partial analysis are generated when the analysis conditions input for the whole shape model are inherited, or when the analysis results data of the whole analysis and the finite element mesh data for the whole analysis are used. It is divided into the case of obtaining by interpolation. Therefore, regarding these, FIG.
It is specifically shown below by using 0.

First, the former case will be described. That is, when inheriting the analysis condition input to the overall shape model as the analysis condition for the partial analysis, the surface element F3 is included in the surface element F1 and the line element E10 is included in the line element E10 from the result of the above-described graphic operation. The information that it is included in E1 is described in the shape model. Therefore, the material condition input for the surface element F1 is inherited by the surface element F3, and the constraint condition input for the line element E1 is inherited by the line element E10. In this way, the conversion from the analysis conditions of the partial shape model to the analysis conditions of the finite element mesh is the same as in the case of the overall analysis.

Next, the latter case, that is, the case of interpolating and interpolating from the analysis result data of the overall analysis and the finite element mesh data for the overall analysis will be described. Also in this case, the line element E12
Information that the line element E13 is included in the surface element F1 is described in the shape model. Therefore, the nodes of the finite element mesh for partial analysis located on these line elements E12 and E13 are interpolated from the analysis result data of the overall analysis to generate boundary condition data. The data of the analysis results to be interpolated are displacement,
Although stress or the like is used, this embodiment will be described assuming that displacement data is used.

First, a node 1602 that requires the generation of boundary condition data as shown in FIG. 16 is searched. Next, the finite element 1601 of the finite element mesh for overall analysis including the node inside is searched. Furthermore, the volume coordinate L of the node 1602 in the searched finite element 1601
1, L2, L3 are calculated, and the boundary condition W of the node 1602 is calculated from the physical quantities W1, W2, W3 of the nodes forming the finite element 1601 using, for example, the following interpolation formula.

(Equation 7) Specifically, the displacement amount obtained by interpolation interpolation from the displacement amount of the analysis result is used as the forced displacement data. From the above,
Data of analysis conditions for partial analysis can be generated.

[0040]

As is apparent from the above detailed description, according to the present invention, the user can obtain a higher accuracy for the entire shape model of the analysis target displayed on the screen or the analysis result. Detailed zooming analysis that includes the partial shape can be easily performed by a simple operation that interactively specifies the partial shape that requires a detailed analysis, which enables the partial shape model that was necessary in the conventional zooming analysis. The preparation work for analysis such as finite element mesh creation and boundary condition setting for the partial model is significantly reduced, and a zooming analysis device and analysis method that are easy to use can be obtained.

Further, according to the present invention, in the vicinity of the boundary portion of the partial shape model included in the inside of the entire shape model, the mesh size ratio between the entire model and the partial model is automatically reduced, so that high-precision zooming is performed. It also has the effect that analysis can be performed efficiently and stably.

[Brief description of drawings]

FIG. 1 is an overall system configuration diagram showing an embodiment of a zooming analysis device according to the present invention.

FIG. 2 is a system configuration diagram of an interactive data input / output processing unit that constitutes the zooming analysis device of FIG.

FIG. 3 is a system configuration diagram of an overall analysis processing unit which constitutes the zooming analysis device of FIG. 1;

FIG. 4 is a system configuration diagram of a partial analysis processing unit that constitutes the zooming analysis device of FIG. 1;

FIG. 5 is a diagram illustrating a representation method using a two-dimensional shape model as an example of a representation method of the entire analysis target shape in the zooming analysis device of the present invention.

6 is a diagram showing a shape model in which analysis conditions are defined in the two-dimensional overall shape model of FIG.

7 is a diagram showing an example of setting a partial shape model to be analyzed in detail for the two-dimensional overall shape model of FIG.

8 is a diagram for explaining a representation method by a two-dimensional shape model of a primitive shape model that sets the partial shape model of FIG.

FIG. 9 is a flowchart showing an algorithm of graphic calculation processing for obtaining a partial shape model.

10 is a diagram showing a partial shape model to be analyzed, which is a result of performing the graphic calculation process of FIG. 9 on the overall shape model of FIG. 5 and the partial shape model of FIG.

11 is a diagram illustrating a method of generating a finite element mesh in the overall shape model of FIG.

FIG. 12 is a flowchart showing a procedure of a finite element mesh generation method for overall analysis shown in FIG.

FIG. 13 is a diagram showing an example of element division in the case where a partial shape model is not considered with respect to the entire shape model of FIG. 5;

FIG. 14 is a diagram showing an example of element division when a partial shape model is considered with respect to the entire shape model of FIG. 5;

15 is a diagram showing an example in which a finite element mesh is generated in the partial shape model for partial analysis shown in FIG.

FIG. 16 is a diagram illustrating the principle of a boundary condition generating method by interpolation of analysis results according to the present invention.

[Explanation of symbols]

 101 Interactive Data Input / Output Processing Unit 102 Overall Analysis Processing Unit 103 Partial Analysis Processing Unit 104 Common Database 105 Input / Output Device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriaki Okamoto 502 Jinritsucho, Tsuchiura-shi, Ibaraki Hiritsu Seisakusho Co., Ltd.Mechanical Research Institute (72) Naoto Saito 502 Jinritsucho, Tsuchiura-shi, Ibaraki Niritsu Seisakusho Co., Ltd. Mechanical Research Laboratory (72) Inventor Naganori Motoi 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory

Claims (17)

[Claims] 1. A device for analysis simulation, which inputs a shape model of an analysis target and data of analysis conditions and outputs data of an analysis calculation result. A zooming analysis apparatus capable of performing analysis by a finite element model having higher accuracy than the analysis accuracy of the entire shape, including means for inputting the entire shape of the analysis target and its analysis conditions; Means for inputting a partial shape; means for automatically generating a finite element model of the overall shape from the input overall shape model to be analyzed and its analysis conditions; and performing the overall analysis; In addition to the determined partial shape, based on at least one of the analysis condition of the overall shape of the analysis target and the analysis result of the overall analysis by the overall analysis means, the finite shape of the partial shape is automatically determined. Timing analyzer -'s characterized by comprising means for performing generating and partial analysis of the elementary model, the. 2. The zooming analysis apparatus according to claim 1, wherein the boundary portion of the partial shape is automatically divided into a portion included in the boundary portion of the entire shape and a portion included in the inside of the entire shape. A zooming analysis device comprising means for classifying. 3. The zooming analysis device according to claim 2, wherein when the finite element model of the overall shape is generated by the overall analysis means, the inside of the overall shape extracted by the classification means is used. In the neighborhood area of the boundary portion of the partial shape included in, the means for reducing the size of the finite element mesh is provided.
Ming analysis device. 4. The zooming analysis device according to claim 2, wherein when the finite element model of the partial shape is generated, the partial shape included in the entire shape extracted by using the classifying unit. With respect to the boundary part, the zooming analysis device is provided with means for automatically generating the data of the boundary condition of the partial shape from the data of the analysis result of the overall analysis. 5. The zooming analysis device according to claim 2, wherein when the finite element model of the partial shape is generated, a part included in a boundary part of the entire shape extracted by using the classifying means. With respect to the boundary portion of the shape, the zooming analysis device is provided with means for automatically inheriting the data of the boundary condition given to the entire shape as the data of the boundary condition of the partial shape. 6. A zooming analysis device capable of performing an analysis simulation by a finite element model having a higher accuracy than the analysis accuracy of the entire shape for a part of the entire shape of the analysis object, wherein Overall shape and its analysis conditions,
And an input / output device that inputs the partial shape that requires high-precision analysis and outputs data of analysis calculation results; from the input entire shape of the analysis target and its analysis conditions,
An overall analysis processing unit that automatically generates a finite element model of the overall shape and performs an overall analysis; and automatically generates a finite element model of the partial shape based on the input partial shape and the analysis conditions. A partial analysis processing unit for generating and performing partial analysis; and a finite element model of the overall shape which is commonly connected to the overall analysis processing unit and the partial analysis processing unit and is executed by the overall analysis processing unit And a database unit for storing the analysis result of the overall analysis by the zooming analysis apparatus. 7. The zooming analysis device according to claim 6, further comprising an interactive data input / output process which is connected to the database unit and enables input by the input / output device in an interactive manner. A zooming analysis device, comprising: a section. 8. The zooming analysis device according to claim 7, wherein the interactive data input / output processing unit is based on the entire shape and the partial shape of the analysis target input by the input / output device. A partial shape model defining unit for automatically classifying the boundary portion of the partial shape into a portion included in the boundary portion of the entire shape and a portion included in the inside of the entire shape by performing graphic calculation processing. A zooming analysis device. 9. The zooming analysis device according to claim 8, wherein the partial analysis processing unit includes the overall analysis processing unit for boundary portions of the partial shapes classified by the partial shape model definition unit. A zooming analysis device, wherein analysis conditions are generated based on the analysis result of the overall analysis stored in the database section analyzed by. 10. The zooming analysis device according to claim 6, wherein the partial analysis processing unit inherits the input analysis condition of the entire shape of the analysis target to obtain the finite element model of the partial shape. Is automatically generated to perform a partial analysis. 11. The zooming analysis device according to claim 6, wherein the partial analysis processing unit interpolates and supplements the analysis result of the overall analysis by the finite element model of the overall shape stored in the database unit. Then, the zooming analysis apparatus is configured to automatically generate the finite element model of the partial shape and perform the partial analysis. 12. A method for analysis simulation in which a shape model of an analysis target and data of analysis conditions are input and data of an analysis calculation result is output. There is a zooming analysis method that can perform analysis using a finite element model that is more accurate than the analysis accuracy of the entire shape. In the analysis of the partial shape required to be analyzed, based on the analysis conditions of the input overall shape of the analysis target, or the analysis result executed,
A zooming analysis method, characterized in that the partial shape is analyzed. 13. The zooming analysis method according to claim 12, wherein the partial shape that requires the highly accurate analysis is input before the analysis of the entire shape of the analysis target is performed. Zooming analysis method. 14. The zooming analysis method according to claim 12, wherein the input of the partial shape that requires the highly accurate analysis is performed after the analysis of the entire shape of the analysis target is performed. Zooming analysis method. 15. The zooming analysis method according to claim 12, wherein after inputting the overall shape of the analysis target and its analysis conditions, the partial shape for which the high-precision analysis is required is input and these are input. Graphic operation processing is performed based on the analyzed whole shape of the analysis target and the partial shape, and the boundary portion of the partial shape is divided into a portion included in the boundary portion of the entire shape and a portion included in the inside of the entire shape. A zooming analysis method characterized by automatic classification. 16. The zooming analysis method according to claim 15, wherein the analysis conditions at the boundary portion when the partial shape is analyzed are automatically generated based on the result of the classification. A zooming analysis method characterized by. 17. The zooming analysis method according to claim 12, wherein in the analysis of the partial shape that requires the highly accurate analysis, the analysis result of the overall analysis by the finite element model of the overall shape is included. A zooming analysis method characterized by performing interpolation and analysis.