JP3350644B2 - Structure analysis system and recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure analysis system for displaying a result of a structure analysis of a three-dimensional object and a recording medium.

[0002]

2. Description of the Related Art Conventionally, stress is obtained as a structural analysis of a three-dimensional object, for example, a mechanical component such as a disk brake of an automobile component, and a stress distribution diagram and a sensitivity coefficient distribution diagram are created and displayed based on the stress analysis result. While comparing and examining the two distribution diagrams, it was repeated to judge the quality of the mechanical component designed this time with respect to the mechanical component designed last time to design the optimal mechanical component.

[0003]

As described above, conventionally, a structural analysis of a three-dimensional object is performed, and a stress distribution diagram and a sensitivity coefficient distribution diagram that is a difference between the stress distribution and the previous (or reference) are obtained. Since it was created and displayed, and the two were compared to judge the quality of the design, it was not possible to judge the quality without a skilled technician, which required a lot of time for the design work. there were.

[0004] The present invention solves these problems,
Based on the sign of the stress data, which is the result of the structural analysis of the three-dimensional object, the sensitivity coefficient data is easily corrected to determine whether it is good or not, and displayed graphically, so that even an unskilled technician can correct the corrected sensitivity coefficient. The purpose is to make it possible to easily judge the quality of the design by looking at the data.

[0005]

Means for solving the problem will be described with reference to FIG. In FIG. 1, a structural analysis system 1 performs a structural analysis of a three-dimensional object, and includes a stress calculating unit 2, a sensitivity coefficient calculating unit 3, a correcting unit 4, an output unit 5, and the like. .

The stress calculating means 2 calculates the stress of a three-dimensional object. The sensitivity coefficient calculator 3 calculates a difference between the previous or reference stress data 6 and the currently calculated stress data 6.

The correcting means 4 corrects the sensitivity coefficient data 7 based on the sign of the stress data 6. Output means 5
Is to graphically edit and output the corrected sensitivity coefficient data 7.

[0008] The stress data 6 is stress data of the three-dimensional object calculated by the stress calculating means 2. The sensitivity coefficient data 7 is a difference between the previous or reference stress data and the current stress data.

Next, the operation will be described. The stress calculation means 2 divides the three-dimensional object into elements, calculates stress data of each element, and calculates the difference between the stress data calculated by the sensitivity coefficient calculation means 3 and the previous or reference stress data to obtain the sensitivity coefficient data. After the calculation, the sensitivity coefficient data calculated based on the sign of the stress data calculated by the correction means 4 is corrected, and the output means 5 graphically edits and outputs the corrected sensitivity coefficient data.

At this time, the output means 5 creates a corrected sensitivity coefficient value as a graph or a corrected sensitivity coefficient value of each element as a color or shading distribution map in association with each element of the three-dimensional object. They are displayed or printed.

The stress component specified from the corrected sensitivity coefficient data is displayed as a graph or a distribution diagram. Therefore, the sensitivity coefficient data 7 is corrected based on the sign of the stress data 6, which is the result of the structural analysis of the three-dimensional object, to a state where it is easy to judge the quality, and graphically displayed. Even if there is, the quality of the design can be easily determined by looking at the graphical display of the corrected sensitivity coefficient data.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment and operation of the present invention will be described in detail with reference to FIGS. In the present embodiment, a form realized by a computer program executed on a computer used for a general purpose such as a personal computer and a workstation will be described.

The computer constituting the structural analysis system of the present invention comprises a processing device, a main storage device, an auxiliary storage device, an input / output device and the like, and executes a computer program. And provided in a portable medium such as a CD-ROM or a main storage device or an auxiliary storage device of another computer connected to the network.

The provided computer program is loaded directly into the main storage of the computer from the portable medium, or once copied or installed from the portable medium to the auxiliary storage, and then loaded into the main storage and executed. Also, when provided by being stored in another device connected to a network, it is also copied to an auxiliary storage device, loaded into a main storage device, and executed after receiving from another device via a network.

FIG. 1 shows a system configuration diagram of the present invention.
In FIG. 1, a structural analysis system 1 performs a structural analysis of a three-dimensional object, here a stress analysis, and includes a stress calculating unit 2, a sensitivity coefficient calculating unit 3, a correcting unit 4, an output unit 5, and the like. Is what is done.

The stress calculating means 2 divides a three-dimensional object into elements and calculates the stress of each element. The sensitivity coefficient calculating means 3 calculates a difference for each element between the previous or reference stress data 6 and the currently calculated stress data 6.

The correction means 4 corrects the sensitivity coefficient data 7 for each element based on the sign of the stress data 6.
The output means 5 edits and outputs the corrected sensitivity coefficient data 7 of each element graphically (bar graph, color / shade distribution map).

The stress data 6 is the stress data of each element of the three-dimensional object calculated by the stress calculating means 2. The sensitivity coefficient data 7 includes the previous or reference stress data,
This is the difference of each element from the current stress data.

The output device 8 outputs the corrected sensitivity coefficient data 7
Is output graphically, such as a display device or a printing device. The input device 9 is a keyboard, a mouse, and the like for inputting various instructions and data.

Next, the operation of the configuration of FIG. 1 will be described in detail according to the order shown in the flowchart of FIG. FIG. 2 is a flowchart illustrating the operation of calculating sensitivity analysis data according to the present invention.

In FIG. 2, S1 calculates a stress.
The stress analysis includes, for example, a three-dimensional shape, a division size, a load condition (load, load position, etc.), a constraint condition (fixing (constraining) the brake pad, etc.), various constants in the case of the disk brake analysis example of FIG. Based on (material constants, etc.), the stress of each known element such as the stress generated on the brake pad surface when a load equivalent to the hydraulic pressure is applied to the cylinder is calculated by simulation.

In step S2, the value of the stress (stress data 6) is output to a file. In step S3, a sensitivity coefficient is calculated. The sensitivity analysis is to analyze the change in the value of the stress due to the change in the shape of the disc brake. When the stress data 6 calculated previously or the stress data 6 serving as the design standard and the dimensions this time are changed, Then, a difference of each element corresponding to the stress data 6 calculated by the simulation is calculated, and sensitivity coefficient data 7 corresponding to a change rate is calculated.

In step S4, the value of the sensitivity coefficient is output to a file. As described above, the stress data 6 and the sensitivity coefficient data 7, which is the difference between the stress data 6, are calculated by the structural analysis of the three-dimensional object, and are stored in a file as shown in FIG.

FIG. 3 shows an example of the sensitivity analysis data structure of the present invention. This is (1) the structure information data of the three-dimensional shape when calculated according to the flowchart of FIG.
(2) Analysis result data (stress data 6) and (3) analysis result data (sensitivity coefficient data 7) are stored in association with each other.

(1) Structural information data: This is information on the structure, such as element information and node information of a three-dimensional object to be analyzed. Element information: Element 1 (element number, component node number 1, component node number 2, ...) Element L (element number, component node number 1, component node number 2, ...) Node information:-Node 1 (node number, coordinate value X, coordinate value Y, coordinate value Z, ...)-Node M (node number, coordinate value X, coordinate value Y, coordinate value Z, ... (2) Analysis result data (stress data 6): This is information on element stress, which is one of the results of stress analysis.

Element stress information: Element 1 (element number X-axis stress σx, Y-axis stress σy, Z-axis stress σz XY shear stress τxy, YZ shear stress τyz, ZX shear stress τzx, main stress 1σ1, main stress 2σ2, main stress 3σ3 ····· Element N (element number X-axis stress σx, Y-axis stress σy, Z-axis stress σz XY shear stress τxy, YZ shear stress τyz, ZX shear stress τzx, main stress 1σ1 , Principal stress 2σ2, principal stress 3σ3 (3) analysis result data (sensitivity coefficient data 7):
This is information on the sensitivity coefficient as a result of the sensitivity analysis.

Element 1 (element number X-axis stress sensitivity Δσx, Y-axis stress sensitivity Δσy, Z-axis stress sensitivity Δσz ... XY shear stress sensitivity Δσxy, YZ shear stress sensitivity Δσyz, ZX shear stress sensitivity Δσzx ... Principal stress 1 sensitivity Δσ1, Principal stress 2 sensitivity Δσ2, Principal stress 3 sensitivity Δσ 3 ······ Element N (element number X-axis stress sensitivity Δσx, Y-axis stress sensitivity Δσy, Z-axis stress sensitivity Δσ z.・ XY shear stress sensitivity Δσxy, YZ shear stress sensitivity Δσyz, ZX shear stress sensitivity Δσzx ... main stress 1 sensitivity Δσ1, main stress 2 sensitivity Δσ2, main stress 3 sensitivity Δσ 3 ... As above, sensitivity analysis data The structure has a structure in which the structural information data of (1), the analysis result data (stress) of (2), and the analysis result data (sensitivity coefficient) of (3) are stored in association with each element.

FIG. 4 is a flowchart illustrating the detailed operation of the present invention. This is a detailed flowchart when correcting the sensitivity coefficient according to the present invention based on the data in FIG. 3 obtained by performing the sensitivity analysis according to the flowchart in FIG. 2 described above.

In FIG. 4, a step S11 specifies a component for sensitivity analysis. This specifies one of the components of the sensitivity analysis in the analysis result data of FIG. 3 described above, for example, one of the following.

Any of the principal stresses σx, σy, σz; XY shear stress σxy, YZ shear stress σyz, ZX
Any of shear stress σzx Others In S12, data of one element is read. this is,
The data of the stress and sensitivity coefficient for one element is read.

In step S13, a stress value corresponding to the designated component is extracted. That is, a stress value corresponding to the component specified in S11 is extracted from the data read in S12. In S14, it is determined whether the stress value is greater than 0. This is S13
It is determined whether or not the stress value of the specified component of one element extracted in step is positive. In the case of YES, the stress value is positive (the stress of the specified component of the element is positive, indicating that the element is in a so-called tension state). Is stored (replaced by the value of the original element), and the process proceeds to S17. On the other hand, S
In the case of NO of 14, the stress value is 0 or negative (the stress of the designated component of the element is 0, indicating that the element is in a compressed state and is negative). The value of the coefficient is stored as it is (the value of the original element is stored), and the process proceeds to S17.

In S17, it is determined whether or not the processing is completed for all the elements. In the case of YES, the process proceeds to S18. If NO, the process returns to S12 and repeats. In S18, the display color of each element is determined. That is, the display color of each element is determined for the sensitivity coefficient data after the sensitivity coefficient data is corrected based on the sign of the stress value of the component specified in S11 to S17. For example, the larger positive element is red and the larger negative element is blue, and the area between the elements is divided into a predetermined range to determine the color between the elements. Instead of deciding the display color of each element, as shown in FIG. 8B to be described later, a graph is displayed with the element number on the horizontal axis and the corrected sensitivity coefficient data at that time on the vertical axis. May be determined.

In step S19, a sensitivity coefficient is displayed. The designer who sees this can easily determine whether the stress component specified at the time of the previous or reference design has been improved in a more desirable direction or has become a bad direction (the reason therefor). For example, in a graph display of the sensitivity coefficient shown in FIG. 8B described later, which is displayed in S19 after the correction, the positive direction of the Y-axis always indicates a desirable direction as a design, and the negative direction of the Y-axis ) Uniquely indicates that the direction is undesirable in the design, so just refer to this, and it is our expert knowledge that the stress at this setting is in the desired direction compared to the previous (reference) Without the need to recognize them).

As described above, for the specified component of the sensitivity analysis, the sensitivity coefficient data is corrected based on the sign of the stress data, and the corrected sensitivity coefficient is graphically displayed. It is now possible to recognize good and bad design results without special knowledge.

FIG. 5 shows an example of analysis of the disc brake of the present invention. This is an example of a three-dimensional object to be analyzed according to the present invention, which has the shape shown in the figure, applies a load as shown, and applies a constraint (restraint condition) to the brake pad as shown. 4 schematically shows an example of stress structure analysis. At this time, the data schematically shown in FIG. 5 is stored in the (1) structure information data portion in the sensitivity analysis data structure of FIG. 3 described above, and is used for sensitivity analysis.

FIG. 6 shows a stress distribution diagram of the present invention. This is a distribution diagram showing analysis result data (stress) obtained by performing a structural analysis on the disk brake of FIG. Actually, color display (the part with a large positive stress value is red,
The large negative portion is blue, and the portion between them is divided into predetermined portions, and the colors between red and blue are displayed as indicated by the color bars on the right side), but here, they are schematically displayed in black and white. The stress is negative in the lower left part and positive in the upper part (see arrow from the bar).

FIG. 7 shows a sensitivity coefficient distribution diagram of the present invention.
This is a sensitivity coefficient distribution diagram corresponding to FIG. 6 described above, and the sensitivity coefficient value is negative at the center and positive at the upper right (see the arrow from the bar on the right). Here, conventionally, FIG.
The skilled designer compared both the stress distribution diagram of FIG. 7 and the sensitivity coefficient distribution diagram of FIG. 7 to judge whether the design shown in the drawing was improved in a desired direction or worsened. If the designer is a professional designer, (1) In the stress distribution diagram of FIG. 6, for example, the upper value is negative (representing compression) and the corresponding sensitivity coefficient distribution diagram of FIG. The same upper value of is positive (indicates that it is going in the pulling direction)
So head for the direction of good design.

(2) In the stress distribution diagram of FIG. 6, for example, the value at the lower center is positive (representing tension), and
Is negative (indicating that it goes in the compression direction), and consequently, it goes in the direction of good design. I was going. That is, the quality of the design cannot be determined just by looking at the sensitivity coefficient distribution diagram of FIG. 7, and the quality of the design must always be determined by comparing with the stress distribution diagram of FIG. In the present invention, the correction is performed in accordance with the flowchart of FIG. 4 described above, and the corrected sensitivity coefficient graph of FIG. ) And (2) are unnecessary, and it is possible to easily recognize immediately whether the design has gone in a good direction or a bad direction.

FIG. 8 is a diagram illustrating the results of the present invention. FIG.
(A) shows a sensitivity coefficient graph (before correction, conventional).
This is because the sensitivity coefficient distribution diagram of FIG. 7 described above displays the value of the sensitivity coefficient in color (density) at the position of each element,
Each element is shown as a graph on the horizontal axis, and the value of the sensitivity coefficient at that time on the vertical axis. In the graph display of the sensitivity coefficient before correction (conventional), it is necessary for the designer to make the above-described determinations (1) and (2) in FIG. 7, and the graph display in FIG. It is not possible to judge whether the design has gone in the good or bad direction.

FIG. 8B shows a sensitivity coefficient graph (after correction, the present invention). According to the flowchart of FIG. 4 described above, the corrected sensitivity coefficient is graphically displayed with the horizontal axis representing each element and the vertical axis representing the value of the sensitivity coefficient at that time. In the graphic display of the sensitivity coefficient after this correction (the present invention), the designer does not need to make the above-described determinations of (1) and (2) in FIG. 7 and only the graph display in FIG. The designer can easily determine whether the design has gone in a good direction or a bad direction by looking at. In this case, since it is difficult to display the color and the density, the corrected sensitivity coefficient data is displayed in a graphical bar graph so as to be easily associated with each element in FIG. 8, but each pixel is displayed two-dimensionally. May be displayed as a corrected sensitivity coefficient distribution map so as to make it easy to see which part of the design has become a desired direction or a bad direction two-dimensionally by color display / shade display.

[0041]

As described above, according to the present invention,
The sensitivity coefficient data 7 is corrected based on the sign of the stress data 6, which is the result of the structural analysis of the three-dimensional object, to a state where it is easy to judge the quality, and a configuration for graphically displaying the data is adopted. Even a technician can easily determine the quality of the design by looking at the graphical display of the corrected sensitivity coefficient data 7. As a result, conventionally, it was not possible to judge the quality of the design unless the stress distribution diagram and the sensitivity coefficient distribution diagram were compared and examined. However, according to the present invention, only one corrected sensitivity coefficient distribution diagram was viewed. This makes it possible to judge the quality of the design, and even an unskilled technician can easily judge the quality of the design by looking at one corrected sensitivity coefficient distribution diagram.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of the present invention.

FIG. 2 is a flowchart illustrating the operation of the present invention.

FIG. 3 is an example of a sensitivity analysis data structure of the present invention.

FIG. 4 is a flowchart illustrating a detailed operation of the present invention.

FIG. 5 is an analysis example of the disc brake of the present invention.

FIG. 6 is a stress distribution diagram of the present invention.

FIG. 7 is a sensitivity coefficient distribution diagram of the present invention.

FIG. 8 is a diagram illustrating the results of the present invention.

[Explanation of symbols]

 1: Structural analysis system 2: Stress calculation means 3: Sensitivity coefficient calculation means 4: Correction means 5: Output means 6: Stress data 7: Sensitivity coefficient data 8: Output device 9: Input device

Claims (4)

(57) [Claims] 1. A structural analysis system for displaying a structural analysis result of a three-dimensional object, comprising: means for dividing the three-dimensional object into elements to calculate stress data of each element; Means for calculating sensitivity coefficient data by calculating a difference from the stress data; and means for correcting and outputting the calculated sensitivity coefficient data based on the sign of the calculated stress data. Structural analysis system. 2. The method according to claim 1, wherein the corrected sensitivity coefficient values of the respective elements are output as a graph or the corrected sensitivity coefficient values of the respective elements are displayed as a color or shade distribution map in association with each element. The structural analysis system according to claim 1, wherein: 3. The structural analysis system according to claim 2, wherein the stress component specified from the corrected sensitivity coefficient data is output as a graph or a distribution map. 4. A means for dividing a three-dimensional object into elements and calculating stress data of each element, and a means for calculating a difference between the calculated stress data and previous or reference stress data to calculate sensitivity coefficient data. And a means for correcting the calculated sensitivity coefficient data based on the sign of the calculated stress data and outputting the corrected data.