JPH0538741A - Output device of design data for optimizing sheet-shaped product - Google Patents

Abstract

PURPOSE:To easily perform optimum reinforcement for a sheet-shaped product by constructing a data output device as a consecutive system wherein a structure sensitivity analysis part is related to a structure analysis part and outputting the comparison result of both reinforcement by a bolt leg and reinforcement by increase of hight and wall thickness of a rib as the numerical data. CONSTITUTION:A structure analysis part 11 is provided which performs the structural analysis of an initially designed article. The structural sensitivity analysis of the initially designed article is performed on the basis of the displacement amount of the respective parts obtained therein in a structure sensitivity analysis part 12. Further a bolt leg is provided to the weakest part of the initially designed article in a first correction part 13 according to the degree of influence formed for the designed article corrected by this correction part 13 in the structure analysis part 11. Furthermore until this designed article reaches the nearly same strength as the designed article reinforced in the correction part 13, the designed article is corrected in a second design correction part 14 so that height and wall thickness of a rib the initially designed article are increased. The data of the respectively designed articles corrected in the above respective correction parts 13, 14 are output from a data output part 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optimized design data output device for thin plate-shaped products, and is particularly used in the field (CAE) of assisting a computer in designing a molded product.

[0002]

2. Description of the Related Art Sheet-shaped products, such as toilet pans, are
The bottom surface is provided with grid-shaped ribs at predetermined intervals to maintain strength. Further, on the bottom surface of this toilet pan, reinforcing bolt legs that also serve as attachments are provided at the four corners.

By the way, when designing such a toilet pan having a thin plate shape, conventionally, a prototype has been prepared and various experiments have been conducted to determine the final shape. As a result, it took a long development period, and there were cases where overdesign was performed in anticipation of safety beyond necessity.

Therefore, recently, in order to solve the problems such as the increase in the development period and the excessive design, various C
An AE program has been introduced.

For example, a CAE for structural analysis for obtaining displacement, stress, natural frequency, temperature distribution, etc. when a load or heat is applied.
A program, a CAE program for structural analysis, etc. for obtaining the degree of influence of design variables (plate thickness, elastic modulus, etc.) on the response (displacement amount, stress, etc.) of interest.

[0006]

However, each of the above-mentioned various CAE programs has heretofore been used alone, and has not been used in any association.
In addition, even if you associate them, it is difficult to determine under what conditions each program is associated,
Since it is difficult to develop a system in which such a program is associated, it has never been provided.

The present invention has been made in view of the above circumstances, and an object thereof is to optimize a thin plate-shaped product capable of optimal design by associating such various CAE programs under a certain condition. It is to provide a design data output device.

[0008]

In order to solve the above-mentioned problems, an optimized design data output device for a thin plate-shaped product according to the present invention has a thin plate shape having a reinforcing rib and a reinforcing bolt leg on the bottom surface. When the product is an initial design product, the displacement amount of each part is obtained by applying a load to each part of the initial design product, and the maximum displacement amount is compared with a reference value set in advance. When the maximum displacement amount obtained by the structural analysis unit and the first structural analysis unit exceeds the reference value, the plate thickness, elastic modulus, etc. of each portion of the initial design product based on the displacement amount of each portion. The structural sensitivity analysis unit that obtains the degree of influence when changing the design variables of, and the weakest part of the initial design product based on the degree of influence obtained by this structural sensitivity analysis unit, and the determined most The above-mentioned A first design modification unit for performing reinforcement by providing bets leg, second to obtain the maximum amount of displacement by performing a structural analysis of the modified design products by the first design modification portion
The structural analysis unit of No. 2 and reinforcement for increasing the rib height and wall thickness of the initial design product until the strength is almost the same as the strength of the design product reinforced by the first design correction unit. A configuration including a design correction unit, a data output unit that outputs data indicating a design product corrected by the second design correction unit, and data indicating a design product corrected by the first design correction unit And

[0009]

In the case of designing, for example, a toilet pan having a reinforcing rib and a reinforcing bolt leg on the bottom surface as a thin plate-shaped product, the first structural analysis unit uses the toilet pan which is an initial design product. The amount of displacement of each part is obtained by applying a load to each part, and the maximum amount of displacement is compared with a reference value preset inside.

In the structural sensitivity analysis unit, if the maximum displacement amount obtained by the first structural analysis unit exceeds the reference value, the strength is insufficient. Therefore, the displacement of each part of the toilet pan is next. Based on the amount, the degree of influence (sensitivity) when design variables such as the plate thickness and elastic modulus of each part of the toilet pan are changed is obtained.

Since the first design correction section can determine which portion of the toilet pan is the weakest from the degree of influence obtained by the structural sensitivity analysis section, the bolt leg is provided at the determined weakest portion. Reinforce.

In the second structural analysis unit, the structural analysis of the toilet pan corrected by the first design correction unit is performed again to obtain the maximum displacement amount.

On the other hand, in the second design correction section, the height of the ribs of the toilet pan, which is an initial design product, is increased until the strength becomes almost the same as the strength of the toilet pan reinforced by the first design correction section. , Reinforce to increase the wall thickness.

In the data output section, the toilet pan data corrected by the second design correction section (for example, maximum displacement and product weight data) and the first design correction section are corrected. Toilet pan data (for example, maximum displacement, product weight, etc.) is output.

With this, the structure analysis and the structure sensitivity analysis can be associated with each other under a certain condition, and the operator can make an operation based on these data output from the data output section.
It becomes possible to judge which reinforcement is more effective.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the electrical construction of an optimized design data output device for thin plate-shaped products according to the present invention.

In the figure, the structural analysis unit 1 calculates the displacement amount of each part by applying a load to each part of the thin plate-shaped product which is the initial design product and the maximum displacement amount.
Reference numeral 1 is a bidirectional connection with a structural sensitivity analysis unit 12 that obtains the degree of influence when design variables such as the plate thickness and elastic modulus of each part of the thin plate-shaped product are changed. The structure analysis unit 11 and the first design correction unit 13 are bidirectionally connected. In addition, the second design correction unit 14 includes a structural analysis unit 11
The output of is derived.

The first design correction section 13 discriminates the weakest portion of the initial design product based on the degree of influence obtained by the structure sensitivity analysis section 12, and provides a bolt leg at the discriminated weakest portion. It is a block that reinforces.

The second design correction unit 14 is reinforced by the first design correction unit 13 when the maximum displacement amount obtained by the structural analysis unit 11 exceeds the internally set reference value. It is a block that reinforces the rib height and wall thickness of the initial design product until the strength is almost the same as that of the designed product.

The outputs of the first design correction section 13 and the second design correction section 14 are led to a data output section 15 to which a display device or a printing device (not shown) is connected. There is.

When a display device is connected, the data output unit 15 outputs data indicating the design product corrected by the design correction units 13 and 14 (for example, data such as maximum displacement amount and product weight). For example, when the screen is displayed in a tabular form and the printing device is connected, each design correction unit 13, 1
The data indicating the design product corrected by 4 is printed on the recording paper in a tabular form, for example.

Next, the operation of the optimized design data output device having the above configuration will be described with reference to the flowchart shown in FIG.

However, in this embodiment, the case where the device of the present invention is applied to the toilet pan 20 having the shape shown in FIG.

The toilet pan 20 shown in FIG. 3 has an initial design shape of 1170 mm in length and 870 in width.
The distance between the grid ribs 22 formed on the bottom surface is 10 mm.
It is set to 0 mm. The rib 22 has a wall thickness of 6 mm and a height of 30 mm. Furthermore, in the four corners of the bottom,
Reinforcing bolt legs 2 are provided at the intersecting portions of the ribs 22.
3 ... is formed. Reference numeral 24 in the drawing is a drainage pipe hole.

In the optimized design data output device of the present invention,
First, the data of the toilet pan 20 having the above-described initial design shape is input to the structure analysis unit 11.

The structural analysis unit 11 performs a structural analysis based on this input data, finds the amount of displacement of each part by applying a load to each part of the toilet pan 20, and
The maximum displacement amount is obtained (step S1).

Further, the structural analysis unit 11 compares the maximum displacement amount with a reference value (for example, 2 mm) set inside (step S2). Then, when the maximum displacement amount exceeds the reference value, the strength is insufficient. Therefore, the structural analysis unit 11 extracts the reinforced portion from the input data of the toilet pan 20 of the initial design shape (step In step S3), the extracted data is given to the structural sensitivity analysis unit 12 together with the displacement amount data.

Next, the structural sensitivity analysis unit 12 obtains the degree of influence (sensitivity) when the design variables such as the plate thickness and elastic modulus of each part are changed based on the displacement amount of each part of the toilet pan 20 and the like. (Step S4).

The degree of influence is calculated and obtained by grasping the magnitude of the slope of the tangent to the response when the design variables such as the plate thickness and elastic modulus of each part are changed.

The first design correction section 13 determines which of the reinforced portions of the toilet pan 20 is the weakest, based on the magnitude of the sensitivity coefficient obtained by the structural sensitivity analysis section 12 (step S5). ), One reinforcing bolt leg 23 is provided at the weakest part (step S
6).

In this embodiment, the bolt leg 23 is provided at a position indicated by a black circle in FIG. However, as described above, the position where the bolt leg 23 can be provided is set in advance, and the structural sensitivity analysis unit 12 sets the bolt leg 23 to the most effective position from the set positions. Will be provided.

In this way, a new bolt leg 23 is newly added.
The shape data of the toilet pan 20 reinforced with is given to the structure analysis unit 11 again (step S7).

In the structural analysis unit 11, the structural analysis is performed again by using the toilet pan 20 thus newly provided with the bolt legs 23, and the displacement amount of each part is applied by applying a load to each part of the toilet pan 20. And the maximum displacement amount are calculated (step S8). Then, the obtained maximum displacement amount data is given to the first design correction unit 13 and the second design correction unit 14 (step S9).

The first design correction section 13 outputs the maximum displacement amount data given from the structure analysis section 11 in step S9 and the product weight data after one bolt leg 23 is provided to the data output section 15. (Step S10). In this embodiment, it is assumed that the maximum displacement amount data at this time is 1.63 mm and the product weight data is 13.6 kg.

On the other hand, in the second design correction section 14, the toilet pan reinforced by the first design correction section 13 (that is, the black circle in FIG. 3) is based on the maximum displacement amount data given from the structure analysis section 11. Bolt leg 2 at the position indicated by
The toilet pan that is the initial design product (that is, the toilet pan before reinforcing the bolt leg 23 to the position indicated by the black circle in FIG. 3) until the strength becomes almost the same as the strength of the toilet pan 20 that is reinforced with 3). Reinforcement is performed to increase the height and thickness of the rib 22 of the pan 20 (step S11). In this embodiment, the thickness of the rib 22 is increased from 6 mm to 10 mm and the height is increased from 30 mm to 45 mm.

The second design correction section 14 outputs the maximum displacement amount data and the product weight data after increasing the height and the wall thickness of the rib 22 in this way to the data output section 15 (step S12). .. In this embodiment, the maximum displacement amount data at this time is 1.52 mm and the product weight data is 18.9.
Suppose it was kilograms.

As a result, the data output unit 15 receives, for example, CR.
When a display device such as T is connected, each of the above data is displayed on the screen of this display device in the form of a list shown in FIG. 4, for example. In addition, the data output unit 15
When a printing device is connected to the above, the above-mentioned data are printed on the recording paper in the form of a list shown in FIG.

From the results shown in this list, the operator will select the reinforcement by the bolt leg having a small product weight in this case. However, in the actual selection, in addition to the above-mentioned data, for example, the cost for adding the bolt leg 23 (material cost for mounting + material) and the material cost for increasing the rib 22 are compared, depending on the product. It will be selected in consideration of the comparison in construction.

In the above embodiment, the operation is advanced to step S9 regardless of the result of the structural analysis in step S8. However, as a result of the structural analysis in step S8, the maximum displacement amount is If it exceeds the set reference value, it is possible to repeat the processing of steps S3 to S8 until the maximum displacement amount becomes equal to or less than the reference value.

Further, the structure sensitivity analysis unit 12 may be configured to guide the result to the second design correction unit 14 to reinforce the rib height, wall thickness and the like.

[0042]

The optimum design data output device for thin plate-shaped products according to the present invention is constructed as a series of systems in which the structural analysis unit and the structural sensitivity analysis unit are associated with each other under a certain condition, and is reinforced by bolt legs. Since the result of comparison with the reinforcement due to the increase in the rib height and the wall thickness is output as numerical data, there is an effect that the optimum reinforcement can be accurately selected in a short time based on the numerical data.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an optimized design data output device for a thin plate-shaped product according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the optimized design data output device of the present invention.

FIG. 3 is a perspective view of a toilet pan that is an example of a thin plate-shaped product.

FIG. 4 is a table showing an example of a comparison result of reinforcement by bolt legs and reinforcement by increase of rib height and wall thickness.

[Explanation of symbols]

 11 Structural Analysis Section 12 Structural Sensitivity Analysis Section 13 First Design Modification Section 14 Second Design Modification Section 15 Data Output Section

Claims (1)

[Claims] 1. When a thin plate-shaped product having a reinforcing rib and a reinforcing bolt leg on the bottom surface is used as an initial design product, a displacement amount of each part is obtained by applying a load to each part of the initial design product. At the same time, a first structural analysis unit that compares the maximum displacement amount with a reference value set in advance, and the maximum displacement amount obtained by the first structural analysis unit exceeds the reference value. Is a structural sensitivity analysis unit that determines the degree of influence when the design variables such as the plate thickness and elastic modulus of each unit of the initial design product are changed based on the displacement amount of each unit, and the structural sensitivity analysis unit. A first design correction section that determines the weakest part of the initial design product based on the degree of influence, and provides the bolt leg to the determined weakest part to reinforce, and the first design correction section. The design structure modified by The height of the rib of the initial design product until the strength is almost the same as the strength of the design product reinforced by the second structural analysis unit that performs the analysis to obtain the maximum displacement amount and the first design correction unit. , A second design modification part for reinforcing the wall thickness, data showing a design product modified by the second design modification part, and a design product modified by the first design modification part. An optimized design data output device for thin plate-shaped products, comprising a data output unit for outputting data.