JP2001331532A - Designing method, structure analyzing device used for the designing method, and design support system used for the designing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a designing method which can design even an object component in a complicated shape to an optimum shape in a short time, a structure analyzing device used for the designing method, and a design support system used for the designing method. SOLUTION: A flywheel housing 4 which has a complicated shape is modeled and inputted to the structure analyzing device 10 to take an analysis and the results of analytic values obtained from plural models are compared to determine an optimum design shape. A partition plate part 4b which affects the analysis of the structure analyzing device 10 most is modeled with a plane disk shape and modeling input to the structure analyzing device is performed as to only the modeled plane disk shape to select an optimum simple shape, which is used to design the object component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a design method suitable for a part to be designed whose modeling input is complicated, such as a flywheel housing, and a structural analysis apparatus and a design method used for the design method. It relates to a design support system to be used.

[0002]

2. Description of the Related Art Conventionally, CAs as shown in FIGS.
CAE (C)
Omputer Aided Engineerin
A design method realizing g), a structural analysis device used in the design method, and a design support system used in the design method are known.

In this type of conventional design method, for example, a component to be designed having a complicated shape such as a flyhole housing 4 interposed between a crankcase 2 and a clutch housing 3 of an internal combustion engine 1 is modeled, The eigenvalue is analyzed by performing the modeling input to the structural analysis device.

The flywheel housing 4 mainly has a bolt insertion portion 4a attached to the crankcase 2 and a substantially disk-like shape surrounded by the bolt insertion portion 4a and having a substantially disk shape. A partition plate 4b provided with a hole 4c through which the rotating shaft 5 is inserted.

[0005] Then, as shown in FIG.
By giving Mode 5, eigenvalue analysis using the CAD data of the flywheel housing 4 is performed.

The CAD data is an FEM model in which all elements are input. The surface components include a shell element, a crankcase side, a clutch housing side, and the partition plate 4.
The flange and the main boss on the periphery of the hole 4c of b are made of solid elements, and have approximately 8000 nodes and 11000 elements.
And

[0007] These CAD data are input to the entire flywheel housing 4 for each design plan.
Each eigenvalue is determined.

For example, in the simulation results shown in FIG. 10, the current product and the ACD-0 to ACD-3 consider the eigenvalue (frequency [Hz]) as a measure of the rigidity, and the higher the eigenvalue, the higher the rigidity. Have been compared.

As another design method of this kind, a structural analysis device used in the design method, and a design support system used in the design method, a simulation device described in Japanese Patent Application Laid-Open No. 7-105243, etc. JP-A-7-04
There is known a data generation system for finite element method analysis described in Japanese Patent No. 4525 and the like.

[0010]

However, in the conventional design method configured as described above, all the design component elements are input and one model is analyzed in five modes. With CAD data obtained by inputting almost all of the design component elements in such an actual shape, it takes an average of 4 days for analysis (calculated assuming that the actual working hours per day is 8 hours).

In addition, when analyzing a total of five models including the current product and ACD-0 to ACD-3, there is a possibility that a total of about 20 days would be required for a 4 day × 5 model.

The present invention has been made in view of the above circumstances, and provides a design method capable of designing an optimum shape in a short time, even for a component to be designed having a complicated shape, a structural analysis apparatus used in the design method, and a structural analysis apparatus. The purpose is to provide a design support system used for a design method.

[0013]

According to the first aspect of the present invention, a part to be designed having a complicated shape is modeled, and a modeling input is made to a structural analysis apparatus. A design method for analyzing and comparing the results of analysis values obtained by a plurality of models to determine an optimal design shape, wherein a portion that most affects the analysis by the structural analysis device is a simple shape. The method is characterized in that a modeling method is performed on the structural analysis device only for the modeled simple shape by performing modeling input with respect to the modeled simple shape, and the optimum simple shape is used for designing a part to be designed. I have.

According to the first aspect of the present invention, since the modeling input is performed only for the modeled simple shape to the structural analysis apparatus, the analysis time is reduced.

[0015] By selecting the optimum simple shape from the analysis results and using the optimum simple shape in designing the design target part, even if the design target part has a complicated shape, it can be used in a short time. Can be designed to the optimal shape.

According to a second aspect of the present invention, the analysis is an eigenvalue analysis, and the analysis value is an eigenvalue.

According to the second aspect of the present invention, the eigenvalue (frequency [Hz]) is analyzed using the CAD data of only the modeled simple shape, and the eigenvalue is considered as a standard of rigidity. The higher the eigenvalue, the higher the stiffness compared.

Therefore, the rigidity of each model can be easily compared, and the optimum simple shape can be accurately determined.

Further, according to the third aspect of the present invention, the selection of the part which most affects the analysis by the structural analysis apparatus is performed by selecting a plurality of parts to be designed having different complicated shapes in advance.
3. A model is determined from a result of analysis by applying a plurality of vibration modes by the structural analysis device.
It is characterized by the described design method.

According to the third aspect of the present invention, a part to be modeled with a simple shape is determined in advance among the parts to be designed having a complicated shape.
The time required for design can be reduced.

According to a fourth aspect of the present invention, in selecting the optimum simple shape, the analysis value is compared by using a value obtained by dividing the analysis value by weight. It features a design method.

According to the fourth aspect of the present invention, the results can be compared by unifying eigenvalues that vary depending on the weight. Therefore, it is possible to easily select the optimum simple shape.

Further, according to the present invention, the simple shape is substantially a flat plate shape, and when selecting the optimum simple shape, the analysis value is compared by using a division value by an area. A feature of the design method according to any one of Items 1 to 3.

According to the fifth aspect of the present invention, since the simple shape is substantially a flat plate shape, a value obtained by dividing an analysis value by an area is used in selecting the optimum simple shape. Even if the comparison is made, the value obtained by the division by the weight can be compared with the same accuracy, and the optimum simple shape can be easily selected.

According to the sixth aspect,
6. The selection of a part that most affects the analysis by the structural analysis apparatus is a part other than a specification part having a condition constraint and a part whose design can be changed, according to any one of claims 1 to 5. The design method is characterized.

According to the sixth aspect of the present invention, it is possible to change the design of the part which has the greatest influence on the analysis by the structural analysis apparatus except for the specification part where the condition is restricted. Since the stiffness in the out-of-plane direction of the flat portion, which has nothing to do with attachment, for example, contributes to the overall stiffness, modeling can be performed with a simple shape.

[0027] Furthermore, the design method according to claim 7 is characterized by the design method according to any one of claims 1 to 6, wherein the part to be designed is a flywheel housing.

According to the seventh aspect of the present invention, since the component to be designed is a flywheel housing, a flat plate-shaped portion such as a partition plate which contributes to rigidity is analyzed by the structural analysis device. Is modeled with a simple shape as the part that has the greatest effect on

In the above structural analysis apparatus, even for a flywheel housing having a complicated shape, only the modeled simple shape is analyzed, the optimum simple shape is selected in a short time, and the overall design time is reduced. Can be shortened.

According to the eighth aspect,
The structural analysis apparatus used in the design method according to any one of claims 1 to 6, further comprising an apparatus main body having a structural analysis unit for performing modeling input of the simple shape and performing eigenvalue analysis. I have.

According to the eighth aspect of the present invention, a part to be designed having a complicated shape can be designed to have an optimal shape in a short time by using the structural analysis unit of the structural analysis apparatus. it can.

According to a ninth aspect of the present invention, there is provided a design support system for use in the design method according to any one of the first to seventh aspects, further comprising a structural analysis device for analyzing a portion contributing to the rigidity. It is characterized by.

According to the ninth aspect, the structural analysis device of the design support system analyzes the portion contributing to the rigidity in a short time.

[0034]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings. Parts that are the same as or equivalent to those in the conventional example will be described with the same reference numerals.

FIGS. 1 to 18 show a design method according to the first embodiment of the present invention. The same or equivalent parts as those in the conventional example are denoted by the same reference numerals and described, and FIGS.
0 will be described with reference to the same drawing.

First, the structure will be described. In the first embodiment, as shown in FIG. 7, an object having a complicated shape of an existing product interposed between a crankcase 2 and a clutch housing 3 of an internal combustion engine 1 is provided. The flyhole housing 4 as a design component is modeled, and the eigenvalue is analyzed by performing modeling input to the structural analysis device.

This flywheel housing 4 is shown in FIG.
As shown in FIG. 3, mainly bolt insertion portions 4a attached to the crankcase 2 and these bolt insertion portions 4a
And a partition plate portion 4b having a substantially disk shape and having a substantially central portion provided with a hole 4c through which the rotary shaft 5 is inserted.

Then, as shown in FIG. 1, the partition plate portion 4, which is the portion that most affects the analysis by the structural analysis device,
b is modeled by a simple shape, and only the modeled partition plate portion 4b is subjected to a modeling input to the structural analysis apparatus 10 to select an optimum simple shape, and the optimum simple shape is designated as a part to be designed. It is configured to be used for the design of the flywheel housing 4.

In the design method according to the first embodiment, as shown in FIG. 5, the structure analyzing apparatus 10 mainly includes an output unit including a display device 11 and an input unit including a keyboard 12 and a mouse 13. And a CAD diagram database 15 connected to the device body 14 for storing CAD drawing data and reading / writing as necessary.

The main unit 14 includes an arithmetic unit 16
And an input / output control unit 17 for controlling the output of the display device 11 and the like. The arithmetic unit 16 includes a structural analysis unit 1 for analyzing eigenvalues of the CAD data.
8, a CAD unit 19 for drawing, and a condition unifying operation unit 20 for dividing by an area so as to unify the conditions of the analyzed eigenvalues.

In the flywheel housing 4 according to the first embodiment, the eigenvalue per unit area (frequency [Hz]) divided by the area in the condition unifying operation unit 20 is considered as a measure of rigidity, and has a high eigenvalue. The higher the rigidity, the higher the rigidity of the display device 11 so that a bar graph is output.

Next, the operation of the design method according to the first embodiment will be described with reference to the flowcharts of the design steps shown in FIGS.

In the design method of the first embodiment, first,
When the design starts in Step 1, a simple modeling portion is selected in Step 2.

The selection will be described in detail. In Step 201 of the flowchart shown in FIG. 3, in the FEM model in which all the elements are input, the surface components are the shell element, the crankcase side, the clutch housing side, and the partition plate. Part 4
The flange and the main boss on the periphery of the hole 4c of b are made of solid elements, and have approximately 8000 nodes and 11000 elements.
Is input.

Next, in Step 202, a mode is input. In the first embodiment, as shown in FIG.
mode1 to Mode5 are given.

Then, in Step 203, these M
The eigenvalue analysis of the CAD data is performed by mode1 to mode5.

In Step 204, all Modes 1 to
It is determined whether the analysis by Mode 5 has been completed.
If all the analyzes have been completed, the process proceeds to the next Step 205, and if the analysis has not been completed, Step 20
Returning to 3, the eigenvalue analysis of the mode that has not been completed is performed.

In Step 205, each of the analyzed Mods
e1 to Mode5 are compared and studied. Although it is considered that the analysis of the primary mode alone can be originally performed to evaluate the rigidity and breakage of the entire power train with respect to vibration, the flywheel housing 4 having a complicated shape is analyzed in the first embodiment. Therefore, in order to evaluate the connection rigidity between the members, the eigenvalues up to the fifth-order mode are obtained as the free ends except for completely restricting the bolt insertion portion 4a attached to the crankcase 2 as the boundary condition ( (See FIG. 9).

From the results shown in FIG. 9, it was found that the rigidity of the entire flywheel housing 4 is greatly affected by the out-of-plane rigidity of the partition plate 4b. Therefore, it is considered that improving the rigidity of the partition plate portion 2b most effectively contributes to improving the rigidity of the entire flywheel housing 4.

Therefore, returning to Step 2 shown in FIG.
The simple modeling portion is used as the partition plate portion 4b, and a simple shape is modeled with a flat disk model, and the process proceeds to the next Step 3. In Step 3, a flat disk 21 having a perimeter 21a fixed thereto shown in FIG. 11, a flat disk 22 with a spider web-shaped rib 22b having a fixed perimeter 22a shown in FIG.
Flat disk 23 with lattice rib 23b to which 3a is fixed, FIG.
Are fixed, and the parallel irregularities 24b, 2 are fixed.
Parallel corrugated plate 24 having alternating 4c, surrounding 2 shown in FIG.
5a are fixed, and five types of simple models such as the radial corrugated plate 25 having the radial irregularities 25b and 25c alternately are created.

The created five types of simple models are read into the structural analysis unit 18 in Step 4,
In Step 5, three types of first to third order modes (a), (b), and (c) shown in FIG. 6 (the same as the three-dimensional modes shown in (d), (e), and (f) in FIG. 6) are given. And eigenvalue analysis is performed.

In the first embodiment, since the rigidity in the out-of-plane direction is captured by the entire simple model, the analysis by the higher-order mode for capturing the partial deformation such as the fourth and fifth order is not performed, but the first to third order is performed. The analysis is performed in modes (a), (b), and (c).

In Step 6, it is determined whether or not the analysis in all the first to third modes (a), (b), and (c) has been completed. If all the analysis is completed, the next Step 7
If the analysis has not been completed yet,
4, the eigenvalue analysis of the combination of the mode and the shape that have not been completed is performed.

In Step 7, the optimal simple model is selected based on the eigenvalue analysis results shown in FIG. At this time, in the first embodiment, the characteristic unifying operation unit 20 of the operation unit 16 divides each eigenvalue (Hz) by an area corresponding to the weight of the flat plate, thereby obtaining a vibration collection per unit area. Number (specific stiffness) is obtained. The calculation result is transmitted to the display device 1 by the input / output control unit 17.
1 is displayed in a bar graph as shown in FIG.

In the first embodiment, it can be seen that the radial corrugated plate 25 shown in FIG. 15 has the most suitable shape in each of the first to third modes (a), (b) and (c).

In Step 8, the radial corrugated plate 25, which is the optimal simple model, is applied to a part to be designed. Then, in Step 9, confirmation analysis is performed. In this confirmation analysis, the process proceeds to subroutine B shown in FIG.
In step 901, the simple FEM model 26 shown in FIG. 17 is input. This simple FEM model 26 has a convex portion 26e
Are formed radially at predetermined angles, and a flange 26 is formed around the flat disk 26a.
b, a bolt insertion portion 26c, a hole 26d formed at the center of the flat disk portion 26a, and the like.
It is configured by appropriately using a simple shape model registered in the AD diagram database.

In Step 902, eigenvalue analysis is performed on the input simple FEM model 26. The first embodiment aims at a shape that can obtain approximately the same degree of rigidity as a conventional product.

That is, in Step 903, it is determined whether or not the target value has been achieved. If the target value has been reached, the process proceeds to the next Step 904. If the target value has not yet been reached, the process returns to Step 3 to create a simple model again. In the first embodiment, it has been found that even in the simple FEM model, the rigidity of the surface itself directly contributes to the rigidity of a complex-shaped structure such as the flywheel housing 4. For this reason, the result is as shown in FIG.
6, the parallel wave plate 24 and the radial wave plate 25
'S superiority remained the same.

At Step 904, for reconfirmation, four types of one type and one type of real FEM as shown in FIGS. Model ADC-0 to ADC-3
Is created as CAD data.

Then, the eigenvalue analysis of each CAD data is performed by each of Mode 1 to Mode 5. Here, in the third order mode, all the real FEM models ADC-
Although the eigenvalues of 0 to ADC-3 are lower than those of the current product, the analysis result of ADC-3 shown in FIG. 19 also indicates that it is a local motion.

In Step 905, these actual FEMs
The models ADC-0 to ADC-3 are compared with the current product,
It is determined whether the target value has been achieved. If the target value has been reached, the process proceeds to the next Step 906. If the target value has not been reached yet, the process returns to Step 3 to create a simple model again.

In Step 906, a physical object is created in a shape determined to be producible, and the process returns to Step 9 to return to Step 9.
At p10, the design is finished.

As described above, in the design method according to the first embodiment and the structural analysis apparatus 10 used in the design method, modeling input is performed only for the modeled simple shape to the structural analysis apparatus. Analysis time is reduced.

From these analysis results, the optimum simple shape is selected, and by using this optimum simple shape for designing the design target part, even if the design target part has a complicated shape, the optimum simple shape can be obtained in a short time. Can be designed to the optimal shape.

The eigenvalue (frequency [Hz]) is analyzed using the CAD data of only the modeled simple shape. The eigenvalue is considered as a standard of rigidity, and the higher the eigenvalue, the higher the rigidity. Be compared.

Therefore, the rigidity of each model can be easily compared, and the optimum simple shape can be accurately determined.

Further, in the flywheel housing 4, a part to be modeled with a simple shape among the designed parts having a complicated shape, such as a disk-shaped member of the partition plate portion 4b, is determined in advance by the subroutine A. If so, the subroutine A can be omitted, and the time required for design can be further reduced.

The results can be compared by unifying the eigenvalues that vary depending on the weight. Furthermore, in the first embodiment, since the simple shape is a substantially flat plate shape, when selecting the optimum simple shape, even if comparison is made using a value obtained by dividing an analysis value by an area, the weight is determined by the weight. The value obtained by the division can be compared with approximately the same accuracy, and the optimum simple shape can be easily selected.

Then, the selection of the part which most affects the analysis by the structural analysis apparatus is performed in consideration of the part other than the specification part where the condition is restricted and the part whose design can be changed.

For this reason, the rigidity in the out-of-plane direction of the partition plate portion 4b, which is a flat portion, which has nothing to do with the attachment of the surrounding bolt insertion portion 4a to the clutch housing 3, contributes to the overall rigidity. Can be used to model with simple shapes. Therefore, without impairing the assemblability with other parts,
A design that improves rigidity can be made.

Further, since the component to be designed is the flywheel housing 4, the partition plate portion 4d which contributes to the rigidity is provided.
Is modeled with a simple shape as a portion having the greatest influence on the analysis by the structural analysis apparatus.

In the structural analysis apparatus 10, even for the flywheel housing 4 having a complicated shape, only the modeled partition plate 4d is analyzed and the optimum simple shape is selected in a short time. Design time can be reduced. Further, in the first embodiment, since the partition plate portion 4d is simply modeled into a flat disk shape, the analysis mode is reduced from five types to three types.

As described above, even if the operation unit 16 having the structure analysis unit 18 of the structure analysis apparatus 10 having the same processing speed as that of the related art is used, the design target part having a complicated shape can be obtained.
It can be designed to the optimum shape in a short time. In the design support system according to the first embodiment, the analysis and design of the flywheel housing 4 are completed in about 8 hours from the start of the design, and the actual working time is reduced to about 1/20 of the actual working time as compared with the conventional design method. I was able to do it.

Although the first embodiment of the present invention has been described in detail with reference to the drawings, the specific structure is not limited to the first embodiment, and there are design changes and the like within a range not departing from the gist of the present invention. Even this is included in the present invention.

For example, in the first embodiment, S in FIG.
In order to perform the confirmation analysis in step 9, a simple FEM model and a real FEM model are created and input in a subroutine B shown in FIG. 4, but the present invention is not limited to this. For example, a radial corrugated plate 25 is most suitable. In the flywheel housing 4 and the like that are known in advance, the creation of one or both of the simplified FEM model and the actual FEM model is omitted, and for example, only one of the simplified FEM model and the actual FEM model is created. Or immediately, St
It is obvious that the actual product may be created in ep906.

In the first embodiment, the keyboard 12 and the mouse 13 are used as input devices. However, the input device is not particularly limited thereto, and may be a digitizer or a tablet usually used for a CAD device. The data to be input is not limited to the input from the keyboard 12 and the mouse 13, but may be, for example, an input on these input devices, the CAD diagram database 15, or a removable medium such as a portable floppy disk, MD, PD, or the like. Alternatively, the data may be read into the arithmetic unit 16 from a connection line such as a LAN, a WAN, or the Internet.

[0077]

As described above, according to the first aspect of the present invention, since only the modeled simple shape is input to the structural analysis apparatus, the analysis time is reduced. Is done.

Then, the optimum simple shape is selected from the analysis results, and the optimum simple shape is used for designing the design target part. Can be designed to the optimal shape.

According to the second aspect of the present invention, the eigenvalue (frequency [Hz]) is analyzed using the CAD data of only the modeled simple shape, and the eigenvalue is considered as a measure of rigidity. Are compared as having higher rigidity.

Therefore, the rigidity of each model can be easily compared, and the optimum simple shape can be accurately determined.

Further, since the part to be modeled with a simple shape is determined in advance among the parts to be designed having a complicated shape, the time required for the design can be further reduced. it can.

According to the fourth aspect, the results can be compared by unifying the eigenvalues that vary depending on the weight. Therefore, it is possible to easily select the optimum simple shape.

Further, according to the fifth aspect, since the simple shape is substantially a flat plate shape, when selecting the optimal simple shape, the value obtained by dividing the analysis value by the area is used for comparison. Even so, the value obtained by dividing by the weight can be compared with substantially the same accuracy, and the selection of the optimum simple shape can be easily performed.

[0084] According to the sixth aspect,
Selection of the part that most affects the analysis by the structural analysis device is performed in consideration of a design changeable part in a part other than the specification part where the constraint of the condition exists. A simple shape can be modeled by using a portion where the rigidity of the plane portion in the out-of-plane direction contributes to the overall rigidity.

Further, according to the seventh aspect of the present invention, since the component to be designed is a flywheel housing, a flat plate-shaped portion such as a partition plate that contributes to rigidity is most suitable for analysis by the structural analysis device. Modeling with a simple shape as the part that affects.

In the structural analysis apparatus, even for a flywheel housing having a complicated shape, only the modeled simple shape is analyzed, and an optimum simple shape is selected in a short time, and the overall design time is reduced. Can be shortened.

[0087] According to the eighth aspect,
It is possible to design an optimum shape in a short time even for a component to be designed having a complicated shape by using the structure analysis unit of the structure analysis apparatus.

According to the ninth aspect, the structural analysis device of the design support system analyzes the portion contributing to the rigidity in a short time, so that the entire design time can be reduced. Practically useful effects such as

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a flywheel housing in a design method and a structural analysis device used in the design method according to the first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a design process in the design method and the structural analysis apparatus used in the design method according to the first embodiment;

FIG. 3 is a subroutine A for selecting an effective part in the design method and the structural analysis apparatus used in the design method according to the first embodiment;
FIG.

FIG. 4 is a flowchart showing a subroutine B for performing confirmation analysis in the design method and the structural analysis apparatus used in the design method according to the first embodiment;

FIG. 5 is a block diagram illustrating a configuration of a design method and a structural analysis apparatus used in the design method according to the first embodiment;

FIG. 6 shows a primary mode (a) used for analysis in the design method and the structural analysis apparatus used in the design method according to the first embodiment.
(D) Secondary mode (b) (e) Tertiary mode (c)
It is a conceptual diagram which shows (f) by the image of a free end and an out-of-plane direction.

FIG. 7 is a perspective view of an internal combustion engine having a flywheel housing to be subjected to structural analysis.

FIG. 8 is a perspective view of a current flywheel housing.

FIG. 9 shows the current flywheel housing.
It is a perspective view which shows the mode given each Mode1-Mode5.

[FIG. 10] Each Mode 1 of each actual model including the current product
It is the graph which compared the eigenvalue (Hz) in -Mode5.

FIG. 11 is a perspective view of a flat disk as an example of a simple model of a design method and a structural analysis device used in the design method according to the first embodiment.

FIG. 12 is a perspective view of a flat disk with cobweb ribs as an example of a simple model of a design method and a structural analysis device used in the design method according to the first embodiment.

FIG. 13 is a perspective view of a flat disk with lattice ribs as an example of a simple model of a design method and a structural analysis device used in the design method according to the first embodiment.

FIG. 14 is a perspective view of a parallel corrugated sheet as an example of a simple model of a design method and a structural analysis device used in the design method according to the first embodiment.

FIG. 15 is a perspective view of a radial corrugated sheet as an example of a simple model of a design method and a structural analysis device used in the design method according to the first embodiment.

FIG. 16 is a graph comparing the analysis results with the specific stiffness obtained by dividing the eigenvalue by the area in the design method and the structural analysis apparatus used in the design method according to the first embodiment.

FIG. 17 is a perspective view of a simple FEM model used for confirmation analysis in the design method and the structural analysis apparatus used in the design method according to the first embodiment.

18A and 18B are a design method and a structural analysis apparatus used in the design method according to the first embodiment, wherein FIG.
(B) is the thick reinforcing shape ADC-1 and (c) is
FIG. 4D is a perspective view of a real FEM model of each flywheel housing having a coarse waveform ADC-2 and a fine waveform ADC-3.

FIG. 19 is a perspective view showing a state in which Mode1 to Mode5 are given to a real FEM model of a fine waveform shape ADC-3 by the design method and the structural analysis apparatus used in the design method according to the first embodiment; is there.

[Explanation of symbols]

 4 Flywheel housing (designed part) 4a Bolt insertion part 4b Partition plate part (part) 10 Structural analysis device 16 Operation part 18 Structural analysis part 20 Condition unified operation part

Claims (9)

[Claims] 1. A part to be designed having a complex shape is modeled, and a modeling input is made to a structural analysis apparatus to analyze the part and to compare the results of analysis values obtained by a plurality of models to obtain an optimal design shape. Is a design method for determining the part that most affects the analysis by the structural analysis device,
By performing modeling with a simple shape and performing modeling input to the structural analysis device only for the modeled simple shape, it is possible to select an optimal simple shape and use the optimal simple shape for designing a part to be designed. Characteristic design method. 2. The design method according to claim 1, wherein the analysis is an eigenvalue analysis, and the analysis value is an eigenvalue. 3. Selection of a part that most affects the analysis by the structural analysis apparatus is performed by modeling a plurality of design target parts presenting a plurality of different complicated shapes in advance, and applying a plurality of vibration modes by the structural analysis apparatus. The design method according to claim 1, wherein the determination is performed based on a result of the analysis. 4. The design method according to claim 1, wherein, when selecting the optimum simple shape, the analysis value is compared using a division value by weight. 5. The method according to claim 1, wherein the simple shape is substantially a flat plate shape, and when selecting the optimum simple shape, the analysis value is compared by dividing the analysis value by the area.
4. The design method according to any one of claims 3 to 3. 6. The selection of a part that most affects the analysis by the structural analysis apparatus is performed in consideration of a part other than a specification part having a condition constraint and a design changeable part. The design method according to any one of claims 1 to 5, characterized in that: 7. The design method according to claim 1, wherein the component to be designed is a flywheel housing. 8. The apparatus according to claim 1, further comprising an apparatus main body having a structural analysis unit for performing modeling input of the simple shape and performing eigenvalue analysis. Structural analysis device used for design method. 9. The design support system used in the design method according to claim 1, further comprising a structural analysis device for analyzing a portion contributing to the rigidity.