JP2004118646A - Analytical model creation system and method thereof, and analytical model creation program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an analytical model creation system capable of automatically creating an analytic model from a three-dimensional CAD model of a product, which is formed on the basis of the three-dimensional CAD data, in a short time. <P>SOLUTION: This analytical model creation system is provided with an intermediate surface creation unit 12 for creating an intermediate surface, which virtually exists between a surface and a back surface of a plate member structuring a material expressed with the three-dimensional data, and a clearance filling unit 15 for creating the analytical model by filling a clearance between two intermediate surfaces, which is formed by creating the intermediate surface in the intermediate surface creation unit 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an analysis model generation apparatus and method, and an analysis model generation program, and more particularly to a technique for generating an analysis model from three-dimensional CAD data that defines the shape of an object.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in order to evaluate the performance of products such as machines and devices, various analyzes such as structural analysis, vibration analysis, and noise analysis of the products have been performed by simulation. By the way, in recent years, with the spread of three-dimensional CAD, the shape of a product is often defined by CAD data. Since the CAD data contains all information that defines the shape of the product, if an analysis model (data) used by the analysis software is created based on the CAD data, the preparation time for the analysis is reduced. Can be greatly reduced.
[0003]
However, since the shape of an actual product made by three-dimensional CAD is too complicated, a complicated analysis calculation is required, and it is not practical to use CAD data defining the shape of the product as it is as an analysis model. Also, for example, when analyzing a sheet metal component of a product, it is often not necessary to obtain information on the thickness.Conventionally, the shape of the sheet metal member has been simplified by hand, which requires a lot of time. ing.
[0004]
For example, Japanese Patent Application Laid-Open No. 6-4628 discloses a method for creating a numerical analysis model. The purpose of this technique is to enable even an unskilled person to easily and appropriately create an analysis model using secondary elements. For this purpose, an analysis model is created using a quadratic element having three nodes, and the computer determines whether or not the position of the intermediate node is located at the center of the side of the element.
[Patent Document 1]
JP-A-6-4628
[0005]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide an analysis model generation apparatus and method and an analysis model generation program which can create an analysis model from a three-dimensional CAD model of a product created by three-dimensional CAD data in a short time without manual operation. To provide.
[0006]
[Means for Solving the Problems]
The means for solving the problem will be described below using the numbers and symbols used in [Embodiments of the Invention]. These numbers and symbols are added to clarify the correspondence between the description of [Claims] and the description of [Embodiments of the Invention]. It should not be used to interpret the technical scope of the described invention.
[0007]
In order to achieve the above object, an analysis model generation device according to a first aspect of the present invention virtually exists between a front surface and a back surface of a plate member constituting an object represented by three-dimensional CAD data. An intermediate plane generating unit (12) for generating an intermediate plane, and a gap filling for generating an analysis model by filling a gap between the two intermediate planes generated by generating the intermediate plane by the intermediate plane generating unit (12). (15).
[0008]
In this case, the gap filling unit (15) can be configured to generate an analysis model by extending one of the two intermediate surfaces until it hits the other intermediate surface. The gap filling unit (15) can be configured to generate an analysis model by extending the two intermediate planes until the two intermediate planes abut each other.
[0009]
In addition, the analysis model generation device according to the first aspect further includes a minute surface deletion unit (13) that deletes a surface smaller than the designated area from among the intermediate surfaces generated by the intermediate surface generation unit (12). It can be configured. The information processing apparatus may further include a hole deletion unit (14) for deleting a hole having a smaller radius than the designated radius among holes formed in the intermediate plane generated by the intermediate plane generation unit (12). Further, the image processing apparatus further includes a roundness removing unit (14) for removing a roundness having a radius smaller than the designated radius from among the roundnesses formed at the corners of the intermediate plane generated by the intermediate plane generating unit (12). it can.
[0010]
According to the analysis model generation device according to the first aspect, the plate member is converted into a surface from the actual product shape defined by the existing three-dimensional CAD data, and the plate member having a small area is deleted. Further, since the analysis model is generated by removing small holes and roundness, complicated calculations are not required, and an analysis model suitable for analysis can be obtained. In addition, since the plate members forming the product are converted to the intermediate surface and the gap between the intermediate surfaces generated by the conversion is automatically filled, the shape of the sheet metal is simplified by hand. Therefore, the time required for the analysis work can be reduced.
[0011]
The analysis model generating method according to the second aspect of the present invention provides an intermediate model virtually existing between the front surface and the back surface of a plate member constituting an object represented by three-dimensional CAD data for the same purpose as described above. An intermediate plane generating step of generating a plane and a gap filling step of generating an analysis model by filling a gap between two intermediate planes generated by generating the intermediate plane are provided.
[0012]
In this case, the gap filling step can be configured to generate an analysis model by extending one of the two intermediate surfaces until it abuts on the other intermediate surface. Also, the gap filling step can be configured to generate an analytical model by extending the two intermediate planes until the two intermediate planes abut each other.
[0013]
Further, the analysis model generation method according to the second aspect of the present invention further includes a minute surface deletion step of deleting a surface smaller than the designated area from the intermediate surfaces generated in the intermediate surface generation step. it can. The information processing apparatus may further include a hole deleting step of deleting a hole having a radius smaller than the designated radius from the holes formed in the intermediate plane generated in the intermediate plane generating step. Further, the method may further include a round removal step of removing a round having a radius smaller than the designated radius from among the rounds formed at the corners of the intermediate plane generated in the intermediate plane generating step.
[0014]
According to the analysis model generation method according to the second aspect, the same operation and effect as those of the above-described analysis model generation apparatus according to the first aspect of the present invention can be obtained.
[0015]
An analysis model generation program according to a third aspect of the present invention provides an intermediate model virtually existing between a front surface and a back surface of a plate member constituting an object represented by three-dimensional CAD data for the same purpose as described above. An intermediate plane generating step of generating a surface; and a gap filling step of generating an analysis model by filling a gap between the two intermediate planes generated by generating the intermediate plane, the computer being executable by a computer. Have been.
[0016]
In this case, the gap filling step can be configured to generate an analysis model by extending one of the two intermediate surfaces until it abuts on the other intermediate surface. Also, the gap filling step can be configured to generate an analytical model by extending the two intermediate planes until the two intermediate planes abut each other.
[0017]
The analysis model generation program according to a third aspect of the present invention further includes a minute surface deletion step of deleting a surface smaller than a designated area from the intermediate surfaces generated in the intermediate surface generation step. it can. The information processing apparatus may further include a hole deleting step of deleting a hole having a radius smaller than the designated radius from the holes formed in the intermediate plane generated in the intermediate plane generating step. Further, the method may further include a round removal step of removing a round having a radius smaller than the designated radius from among the rounds formed at the corners of the intermediate plane generated in the intermediate plane generating step.
[0018]
The analytic model generation program according to the third aspect has the same operation and effect as the analytic model generation apparatus according to the first aspect of the present invention described above.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0020]
FIG. 1 is a block diagram illustrating a configuration of an analysis model generation device according to an embodiment of the present invention. This analysis model generation device includes a computer 10, a three-dimensional CAD model database 20, an analysis model database 30, an input device 40, and a display device 50.
[0021]
The three-dimensional CAD model database 20 stores three-dimensional CAD data representing three-dimensional CAD models of a plurality of products. The three-dimensional CAD data stored in the three-dimensional CAD model database 20 is read by the file processing unit 11 of the computer 10, and is used for generating an analysis model.
[0022]
The analysis model database 30 stores the analysis model generated by the computer 10. Using the analysis model stored in the analysis model database 30, various analyzes such as structural analysis, vibration analysis, and noise analysis of the product are performed.
[0023]
The input device 40 is used to give various instructions to the computer 10 when generating an analysis model. The input device 40 specifically includes a keyboard, a mouse, a touch panel, and the like. Items input from the input device 40 will be described later in detail.
[0024]
The display device 50 is used to display the contents generated at each stage when generating the analysis model. The display device 50 specifically includes a CRT display, an LCD, a PDP, and the like. The contents displayed on the display device 50 will be described later in detail.
[0025]
The computer 10 is specifically composed of a personal computer, a workstation, a general-purpose computer, or the like. The computer 10 includes a file processing unit 11, an intermediate plane generation unit 12, a minute plane deletion unit 13, a hole and roundness deletion unit 14, a gap filling unit 15, and a mesh creation unit 16.
[0026]
The file processing unit 11 causes the display device 50 to display a list of a plurality of three-dimensional CAD models stored in the three-dimensional CAD model database 20 in response to an instruction from the input device 40. Further, the file processing unit 11 reads out three-dimensional CAD data corresponding to one three-dimensional CAD model selected by the input device 40 from among the three-dimensional CAD models listed on the display device 50, and generates an analysis model. To serve. Further, the file processing unit 11 performs a process of storing the surface model generated by filling the gap in the gap filling unit 15 and the analysis model created by the mesh creation unit 16 in the analysis model database 30.
[0027]
The intermediate plane generating unit 12 generates a plane model composed of a plane having no thickness from a three-dimensional CAD model of a product composed of a plate member having a thickness. More specifically, a plate member is extracted from the three-dimensional CAD data read from the three-dimensional CAD model database 20 via the file processing unit 11, and a virtual member is located between the front surface and the back surface of the extracted plate member. Generates an intermediate plane that exists in Then, the generated plane model including the intermediate plane is sent to the minute plane deletion unit 13.
[0028]
The minute plane deletion unit 13 deletes a part having an area (small plane) smaller than the value specified from the input device 40 from the plane model sent from the intermediate plane generation unit 12. Since the minute surface hardly affects the structural analysis, vibration analysis, noise analysis, and the like of the product, the analysis calculation is simplified by removing the minute surface. The surface model from which the minute surface has been deleted by the minute surface removing unit 13 is sent to the hole and roundness removing unit 14.
[0029]
The hole and roundness removing unit 14 calculates a corner of a hole and a plate member having a radius (R) smaller than the value specified from the input device 40 from the surface model from which the minute surface transmitted from the minute surface removing unit 13 has been deleted. Remove the roundness existing in. In this case, a configuration may be adopted in which holes and round portions having a peripheral length smaller than the value designated from the input device 40 are deleted. Since the holes and roundness hardly affect the structural analysis, vibration analysis, noise analysis, and the like of the product, the analysis calculation is further simplified by removing the holes and roundness. The surface model from which holes and roundness have been removed by the hole and roundness removing unit 14 is sent to the gap filling unit 15.
[0030]
In addition, instead of the hole and roundness removing unit 14, two holes, a rounding removing unit and a rounding removing unit, are provided, and the processing of deleting the hole and the processing of removing the roundness can be performed separately. According to this configuration, since the radius R of the hole and the radius R of the roundness can be separately specified, the deletion target can be specified more finely.
[0031]
When the gap between the surfaces generated by generating the surface from the plate member having the thickness in the intermediate surface generation unit 12 is smaller than the value specified from the input device 40, the gap filling unit 15 fills the gap. Perform the filling process. The following two cases can be considered as cases where a gap is generated when the intermediate plane is generated. The first case is, for example, as shown in FIG. 5 (A), when one surface is stretched and hits the other surface, which is called a T-shape for convenience. The second case is, for example, as shown in FIG. 5 (B), when both surfaces are stretched and come into contact with each other, and this is called an L-shape for convenience.
[0032]
The surface model in which the gap is filled by the gap filling unit 15 is sent to the file processing unit 11 and the mesh creation unit 16 as CAD intermediate data in, for example, IGES format. The file processing unit 11 that has received the surface model from the gap filling unit 15 stores CAD intermediate data representing the surface model in the analysis model database 30 according to an instruction from the input device 40.
[0033]
The mesh creating unit 16 divides the surface model received from the gap filling unit 15 into meshes according to an instruction from the input device 40, and generates, for example, a Nastran file for finite element method analysis software as an analysis model to be used for analysis. I do. The analysis model created by the mesh creation unit 16 is sent to the file processing unit 11. The file processing unit that has received the analysis model from the mesh creation unit 16 stores data representing the analysis model in the analysis model database 30 in response to an instruction from the input device 40.
[0034]
The operation of the analysis model generation device configured as described above is performed using an initial screen displayed on the display device 50 as shown in FIG. In the initial screen, "1-Open file", "2-Open model file", "3-Free edge display", "4-Middle total surface creation", "5-Area designation surface deletion" , “Delete 6-hole, R”, “7-Modify clearance”, “8-IGES file output”, “9-Mesh creation”, “10-Nastran file creation”, and “End” buttons are formed. ing. Each button can be operated independently.
[0035]
Next, an analysis model process executed by the analysis model generation device configured as described above will be described with reference to flowcharts shown in FIGS.
[0036]
First, while the initial screen shown in FIG. 2 is displayed on the display device 50, it is checked whether the “1” button has been pressed, that is, whether an instruction to “open a file” has been issued (step S10). When it is determined that the “1” button has been pressed, the file processing unit 11 displays a list of the file names of the plurality of three-dimensional CAD models stored in the three-dimensional CAD model database 20 on the display device 50. (Step S11). The user selects one desired file name from this list of file names. On the other hand, if it is determined that the “1” button has not been pressed, the process of step S11 is skipped.
[0037]
Next, it is checked whether the "2" button has been pressed, that is, whether an instruction to "open a model file" has been issued (step S12). Then, when it is determined that the “2” button has been pressed, the file processing unit 11 reads out the three-dimensional CAD model having the file name selected in step S11 from the three-dimensional CAD model database 20 and opens it ( Step S13). On the other hand, if it is determined that the “2” button has not been pressed, the process of step S13 is skipped.
[0038]
Next, it is checked whether the "3" button has been pressed, that is, whether "free edge display" has been instructed (step S14). Then, when it is determined that the “3” button has been pressed, the image forming unit (not shown) forms a three-dimensional image of the product based on the three-dimensional CAD data of the opened three-dimensional CAD model. Is displayed on the display device 50 (step S15). In this three-dimensional image, as shown in FIG. 6, the plate member has a thickness. On the other hand, if it is determined that the “3” button has not been pressed, the process of step S15 is skipped.
[0039]
Next, it is checked whether the "4" button has been pressed, that is, whether "creation of the intermediate layer" has been instructed (step S16). Then, when it is determined that the “4” button has been pressed, an intermediate plane generating process is performed (step S17). In the intermediate plane generation processing, first, a thickness designation screen (not shown) is displayed on the display device 50. The user uses the input device 40 to input the maximum value of the thickness of the plate member for which the intermediate plane is to be created, using this thickness designation screen.
[0040]
As a result, the intermediate plane generation unit 12 generates a plane model composed of planes having no thickness from the three-dimensional CAD model of the product composed of plate members having a thickness equal to or less than the specified thickness. More specifically, the intermediate plane generation unit 12 extracts a plate member from the three-dimensional CAD data received from the file processing unit 11, and virtually exists between the front surface and the back surface of the extracted plate member. Generate an intermediate plane. Then, by performing this process on all the plate members, a surface model consisting of only the intermediate surface as shown in FIG. 7 is created and displayed on the display device 50 (step S17). In the surface model shown in FIG. 7, minute surfaces, holes, roundness formed at corners, and the like remain. If it is determined in step S16 that the "4" button has not been pressed, the process in step S17 is skipped.
[0041]
Next, it is checked whether the "5" button has been pressed, that is, whether "delete area designated surface" has been instructed (step S18). Then, when it is determined that the “5” button has been pressed, a minute surface deletion process is performed (step S19). In the minute surface deletion processing, first, an area designation screen (not shown) is displayed on the display device 50. Using this area designation screen, the user inputs the maximum value of the area of the face to be deleted from the input device 40. As a result, the surface having the area equal to or smaller than the designated area is searched and deleted, and the surface model from which the minute surface has been deleted is displayed on the display device 50 as shown in FIG. If it is determined in step S18 that the "5" button has not been pressed, the processing in step S19 is skipped.
[0042]
Next, it is checked whether the "6" button has been pressed, that is, whether "delete hole or R" has been instructed (step S20). When it is determined that the "6" button has been pressed, a hole and roundness (R) deletion process is performed (step S21). In the hole and roundness deletion processing, first, a radius designation screen (not shown) is displayed on the display device 50. Using this radius designation screen, the user inputs from the input device 40 the maximum value of the radius of the hole and roundness to be deleted. As a result, holes and roundnesses smaller than the specified radius are searched and deleted. As a result, a surface model in which holes and roundness having a small radius are deleted as shown in FIG. 9 is displayed on the display device 50. If it is determined in step S20 that the “6” button has not been pressed, the process in step S21 is skipped.
[0043]
Next, it is checked whether the "7" button has been pressed, that is, whether "clearance correction" has been instructed (step S22). When it is determined that the “7” button has been pressed, a gap filling process, that is, a clearance correction process is performed (step S23). In the gap filling process, first, a gap designation screen (not shown) is displayed on the display device 50. Using this gap designation screen, the user inputs the maximum value of the gap to be filled from the input device 40.
[0044]
Thereby, the gap filling unit 15 pulls the angles A and C of the projection source surface 50 to the points B and D on the projection destination surface 51 in the case of the T type as shown in FIG. Perform the extension process. In the case of an L-shape as shown in FIG. 5B, the angles E and G of the projection source surface 60 and the points F and H on the projection destination surface 61 are determined by using the projection source surface 60 and the projection destination surface 60. Until the surface 61 abuts, a process of extending the respective surfaces is performed. As a result, a surface model in which the gap is filled as shown in FIG. 11 is generated from the surface model having the gap as shown in FIG. 10, and is displayed on the display device 50. If it is determined in step S22 that the “7” button has not been pressed, the process in step S23 is skipped.
[0045]
Next, it is checked whether the "8" button has been pressed, that is, whether "IGES file output" has been instructed (step S24). When it is determined that the “8” button has been pressed, an IGES file output process is performed (step S25). In the IGES file output process, the file processing unit 11 stores the surface model generated in step S23 as an IGES file in the analysis model database 30. This IGES file is used in other CAD systems as CAD intermediate data. If it is determined in step S24 that the “8” button has not been pressed, the process in step S25 is skipped.
[0046]
Next, it is checked whether the "9" button has been pressed, that is, whether "mesh creation" has been instructed (step S26). Then, when it is determined that the "9" button has been pressed, a mesh creation process is performed (step S27). In this mesh creation processing, the mesh creation unit 16 divides the surface model generated in step S23 into meshes, and generates an analysis model as shown in FIG. If it is determined in step S26 that the "9" button has not been pressed, the process in step S27 is skipped.
[0047]
Next, it is checked whether the "10" button has been pressed, that is, whether "Nastran file creation" has been instructed (step S28). If it is determined that the "10" button has been pressed, a Nastran file creation process is performed (step S29). In this Nastran file creation processing, the mesh creation unit 16 creates a Nastran file for the finite element method analysis software based on the analysis model created in step S25. The file processing unit 11 stores the created Nastran file in the analysis model database 30. This allows various analysis software to perform analysis by the wired element method using the Nastran file stored in the analysis model database 30. If it is determined in step S26 that the "10" button has not been pressed, the processing in step S29 is skipped.
[0048]
Next, it is checked whether the "end" button has been pressed (step S30). If it is determined that the “end” button has not been pressed, the sequence returns to step S10, and the above-described processing is repeatedly executed. Therefore, when the user is not satisfied with the result obtained in each step, the user can restart from an arbitrary step by pressing a desired button on the initial screen. If it is determined in step S30 that the “end” button has been pressed, the analysis model generation processing by the computer 10 ends.
[0049]
FIG. 13 shows an example in which the analysis model shown in FIG. 13B is generated from the actual three-dimensional CAD model shown in FIG. 13A using the analysis model generation device according to the embodiment of the present invention. FIG. It can be understood that the thick plate member of the three-dimensional CAD model is converted into a surface, the plate member having a small area is removed, and small holes and roundness are removed.
[0050]
As described above, according to the analysis model generating apparatus according to the embodiment of the present invention, a plate member is converted into a surface from an actual product shape defined by existing three-dimensional CAD data, and Since an analysis model is generated by removing a plate member having an area and further removing small holes and roundness, a complicated calculation becomes unnecessary, and an analysis model suitable for analysis can be obtained.
[0051]
In addition, the plate member constituting the product is converted into an intermediate surface by the intermediate surface generating unit 12, and the gap between the intermediate surfaces generated by the conversion is automatically filled by the gap filling unit 15. Therefore, it is not necessary to manually simplify the shape of the sheet metal, and the time required for the analysis work can be reduced.
[0052]
【The invention's effect】
As described in detail above, according to the present invention, an analysis model generation apparatus and method capable of creating an analysis model from a three-dimensional CAD model of a product created with three-dimensional CAD data in a short time without manual intervention, and An analysis model generation program can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an electrical configuration of an analysis model generation device according to an embodiment of the present invention.
FIG. 2 is a diagram showing an initial screen used to operate the analysis model generation device according to the embodiment of the present invention.
FIG. 3 is a flowchart (part 1) illustrating an operation of the analysis model generation device according to the embodiment of the present invention.
FIG. 4 is a flowchart (part 2) illustrating an operation of the analysis model generation device according to the embodiment of the present invention.
FIG. 5 is a diagram for explaining gap filling of the analysis model generation device according to the embodiment of the present invention.
FIG. 6 is a diagram for explaining gap filling of the analysis model generation device according to the embodiment of the present invention.
FIG. 7 is a diagram showing a surface model including only an intermediate surface generated by the analysis model generation device according to the embodiment of the present invention.
FIG. 8 is a diagram showing a surface model in which a minute surface is deleted from the surface model shown in FIG. 7;
9 is a diagram showing a surface model in which holes and roundnesses having a small radius are deleted from the surface model shown in FIG. 8;
10 is a view of the surface model shown in FIG. 9 as viewed from another angle.
11 is a diagram showing a surface model obtained by performing gap filling on the surface model shown in FIG. 10;
12 is a diagram showing an analysis model obtained by performing mesh processing on the surface model shown in FIG. 11;
FIG. 13 is a diagram showing an example in which an analysis model is generated from an actual three-dimensional CAD model using the analysis model generation device according to the embodiment of the present invention.
[Explanation of symbols]
10 computer
11 File processing unit
12 Intermediate plane creation unit
13 Micro face removal part
14 Hole and roundness removal part
15 gap filling section
16 mesh creation unit
20 3D CAD model database
30 Analysis model database
40 input device
50 Display device

Claims (18)

An intermediate surface generating unit that generates an intermediate surface virtually existing between the front surface and the back surface of the plate member forming the object represented by the three-dimensional CAD data;
An analysis model generation device comprising: a gap filling unit that generates an analysis model by filling a gap between two intermediate planes generated by generating the intermediate plane by the intermediate plane generation unit. The analysis model generation device according to claim 1, wherein the gap filling unit generates the analysis model by extending one of the two intermediate surfaces until the intermediate surface abuts on the other intermediate surface. The analysis model generation device according to claim 1, wherein the gap filling unit generates the analysis model by extending the two intermediate planes until the two intermediate planes abut each other. The analysis model generation device according to any one of claims 1 to 3, further comprising a minute surface deletion unit that deletes a surface smaller than a designated area from the intermediate surfaces generated by the intermediate surface generation unit. 5. The apparatus according to claim 1, further comprising: a hole deletion unit configured to delete a hole having a radius smaller than a specified radius among holes formed in the intermediate plane generated by the intermediate plane generation unit. 6. The described analysis model generation device. The roundness removing unit according to any one of claims 1 to 5, further comprising: a roundness removing unit that removes a roundness having a radius smaller than a designated radius from among the roundnesses formed at the corners of the intermediate plane generated by the intermediate plane generating unit. An analysis model generation device according to claim 1. An intermediate plane generating step of generating an intermediate plane virtually existing between the front surface and the back surface of the plate member constituting the object represented by the three-dimensional CAD data;
A gap filling step of creating an analysis model by filling a gap between two intermediate planes generated by generating the intermediate plane. The analysis model generation method according to claim 7, wherein the gap filling step generates the analysis model by extending one of the two intermediate planes until it abuts on the other intermediate plane. The analysis model generation method according to claim 7, wherein the gap filling step generates an analysis model by extending the two intermediate planes until the two intermediate planes abut each other. The analysis model generation method according to any one of claims 7 to 9, further comprising: a minute plane deletion step of deleting a plane smaller than a designated area from the intermediate planes generated in the intermediate plane generation step. 11. The method according to claim 7, further comprising: a hole deleting step of deleting a hole having a radius smaller than a specified radius among holes formed in the intermediate plane generated in the intermediate plane generating step. 11. The analysis model generation method described. 12. The method according to claim 7, further comprising: removing a roundness having a radius smaller than a designated radius from among the roundnesses formed at the corners of the intermediate plane generated in the intermediate plane generating step. 13. An analysis model generation method according to claim 1. An intermediate plane generating step of generating an intermediate plane virtually existing between the front surface and the back surface of the plate member constituting the object represented by the three-dimensional CAD data;
A computer-executable analysis model generation program comprising: a gap filling step of generating an analysis model by filling a gap between two intermediate planes generated by generating the intermediate plane. 14. The computer-executable analysis model generation program according to claim 13, wherein the gap filling step generates the analysis model by extending one of the two intermediate surfaces until it hits the other intermediate surface. . 14. The computer-executable analysis model generation program according to claim 13, wherein the gap filling step generates an analysis model by extending the two intermediate planes until the two intermediate planes abut on each other. 16. The computer-executable computer according to claim 13, further comprising a minute surface removing step of removing a surface smaller than a designated area from the intermediate surfaces generated in the intermediate surface generating step. Analysis model generation program. 17. The method according to claim 13, further comprising a hole deleting step of deleting a hole having a smaller radius than a designated radius among holes formed in the intermediate plane generated in the intermediate plane generating step. An analysis model generation program executable by the computer described in the above. 18. The method according to claim 13, further comprising the step of removing a roundness having a radius smaller than a designated radius from among the roundnesses formed at the corners of the intermediate plane generated in the intermediate plane generating step. An analysis model generation program executable by the computer according to claim 1.

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