JP3307544B2 - Analysis device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention analyzes a stress distribution and a temperature distribution of an object which is composed of a plurality of components such as an electronic device on a workstation and in which an elongated component is included in a large component. Simulation CAD / CAE (Computer AidedDesign / Computer
Aided Engineering)
More specifically, among the operations for setting the boundary conditions for the analysis calculation with respect to the three-dimensional three-dimensional shape as the analysis target object, the boundary conditions are set so that the setting, confirmation, and correction operations can be easily performed. The present invention relates to an analysis device having an improved icon display position.

[0002]

2. Description of the Related Art IC (Integrated Circuit)
Electronic devices such as packages are manufactured and operated during
Failures such as cracking of the package and peeling of the chip from the substrate due to heat generation occur. As one of means for preventing the occurrence of these failures, a finite element method or a boundary element method, which is a method of simulating thermal stress and examining the cause of the failure by using an analyzer performing the processing shown in FIG. Conventionally known. For example, Japanese Patent Application Laid-Open No. 3-231375 discloses a method of creating an analysis model for the boundary element method.

As an example of stress analysis, consider the design of a handle. As shown in FIG. 7, the handle 41 to be analyzed is
A screw 43 is attached to a door 42 of a certain product. At this time, the purpose is to investigate the distribution of stress applied to the handle 41 when the handle 41 is erroneously pressed from above, and to examine the strength of the fixed surface to the door 42. FIG. 8 is a view showing the shape of the handle 41, and FIG. 9 is a view showing a model of boundary conditions necessary for stress analysis. Considering in two dimensions, the coordinates of each vertex of the surface 44 are represented by Pn (Xn, Yn)
(N = 1 to 16), the position of the center of gravity G (Xg, Yg)
Is obtained by the following calculation.

[0004]

(Equation 1)

In the case of the handle 41, the position G of the center of gravity does not exist on the surface 44 as shown in FIG.

[0006] In the analysis apparatus, among the operations for setting the boundary conditions for the calculation for examining the temperature distribution and the stress distribution, the setting,
In order to facilitate confirmation and correction, the fact that the boundary condition has been set is displayed with an icon. Icons are
An icon that indicates that the boundary condition has been set is referred to as a "boundary condition icon". In the conventional analyzer, as shown in FIG.
The boundary condition is set at step c2, and at step c2, a boundary condition icon is displayed at the position of the center of gravity of the analysis target surface regardless of the shape of the analysis target surface. For example, in the display example shown in FIG. 12, an L-shaped analysis target surface 46 is displayed on the display screen 45, and a boundary condition icon is displayed at the position of the center of gravity 47 of the analysis target surface 46. In the display example shown in FIG. 13, a parallelogram-shaped analysis target surface 48 having a relatively large hole is displayed on the display screen 45, and a boundary condition icon is displayed at the center of gravity 49 of the analysis target surface 48. ing.

[0007]

An electronic device is generally composed of a plurality of components, and often has a structure in which an elongated component is included in a large component. Therefore, in the analysis device, boundary conditions are added to each surface and each solid of the electronic device to be analyzed, and their shapes are formed by joining elongated components such as a lead frame or a plurality of components by a mold. Most of the joint surfaces are.
If boundary conditions are set for these shapes, it is very difficult to confirm and correct them.

For example, as shown in FIG. 14, when an L-shaped relatively elongated part becomes the analysis target surface 46, when a part of the analysis target surface 46 is enlarged and displayed, only the hatched area 50 is displayed. Is displayed, the area 51 indicated by the broken line is not displayed, and the entire analysis target surface 46 is not displayed.
In particular, when the center of gravity position 47 does not exist in the display screen 45, the boundary condition icon is not displayed, so that it is difficult to perform a confirmation operation or the like.

The analysis target surface 46 for setting the boundary conditions
Is a concave polygon, and if the position of the center of gravity 47 does not exist on the analysis target surface 46, the boundary condition icon is displayed outside the analysis target surface 46, and the confirmation work is inconvenient. A concave polygon is one in which the interior angle of at least one vertex of the polygon is greater than 180 degrees.

Further, as shown in FIG. 16, when a hole 53 exists at the center of gravity 54 of the analysis target surface 52, a boundary condition icon is displayed on the analysis target surface 52 but on the hole 53. After all, confirmation work is inconvenient. The hole 53 is not a true hole. As shown in FIG. 17, when the shape of the object to be analyzed is input, the joining portion 53 between the two parts 55 and 56 is joined with a part of the surface to another part 56. This is stored as a hole in the surface 52 that is present.

Japanese Patent Laid-Open Publication No. Hei 2-230468 discloses that, when an analysis model used for a numerical analysis method such as the finite element method or the boundary element method is created, whether the set boundary conditions are set as intended by the creator. It discloses a technique capable of quickly and accurately determining whether or not the determination is no. However, the technique disclosed in this publication determines whether or not the set boundary condition is correct, and does not check whether or not the boundary condition is set on the analysis target surface desired by the user.

An object of the present invention is to provide a boundary condition icon indicating that boundary conditions have been set for an analysis object having a three-dimensional three-dimensional shape in order to smoothly perform a boundary condition setting operation for analysis simulation. Is to be displayed at a position where a user can easily confirm the same.

[0013]

SUMMARY OF THE INVENTION The present invention comprises a display means,
Shape input means for inputting a three-dimensional shape of the object to be analyzed;
A shape storage unit configured to store a shape input by the shape input unit, a display mode input unit configured to input a display mode such as a magnification and a direction when the analysis target object is displayed on the display unit, A shape display control unit that displays an analysis target object on the display unit based on the stored content and a display mode input from the display mode input unit; a surface selection unit that selects an analysis target surface from the analysis target object; Boundary condition setting means for setting boundary conditions on the analysis target surface selected by the surface selection means, boundary condition storage means for storing the boundary conditions set by the boundary condition setting means, and storage contents of the boundary condition storage means A boundary condition display control means for displaying a boundary condition on an analysis target surface displayed on the display means based on the boundary condition; and an analysis calculation based on the set boundary condition. Analysis calculation means for performing, analysis result storage means for storing an analysis result by the analysis calculation means, analysis result display control means for displaying the analysis result of the analysis result storage means on the display means, the boundary condition display The control unit detects a shape of the display target surface displayed on the display unit among the selected analysis target surfaces, and a boundary condition is set for the analysis target surface at the position of the center of gravity of the display target surface. And displaying a boundary condition icon indicating the following. According to the present invention, when a three-dimensional shape of an object to be analyzed such as an electronic device is input from the shape input unit, the input shape is stored in the shape storage unit, and the display mode input from the display mode input unit; For example, the object to be analyzed is displayed on the display means according to the magnification and the direction. When an analysis target surface to be subjected to numerical analysis such as stress distribution and temperature distribution is selected from the analysis target object, boundary conditions are set for the selected analysis target surface, and a boundary condition indicating that the boundary conditions have been set is displayed. An icon is displayed. The boundary condition icon is displayed at the position of the center of gravity of the display target surface displayed on the display unit among the selected analysis target surfaces. Therefore, for example, when the analysis target surface is an elongated component or when a part of the analysis target surface is enlarged and displayed, the position of the center of gravity of the analysis target surface may not be included in the display target surface. At this time, the boundary condition icon is not displayed, and the user cannot confirm whether the boundary condition is set on the desired analysis target surface. However, in the present invention, since the analysis target surface is displayed at the position of the center of gravity of the display target surface displayed on the display means, even if the analysis target surface has any shape or only a part is displayed, Also, the boundary condition icon is always displayed. By seeing the boundary condition icon, the user checks whether or not the boundary condition is set for the desired analysis target surface, and performs an operation such as correction if there is an error. Thereafter, an analysis calculation is performed by the analysis calculation means based on the set boundary conditions, and the analysis result is stored in the analysis result storage means and displayed on the display means.

Further, in the present invention, the boundary condition display control means divides the display target surface into a plurality of convex polygons when the display target surface is a concave polygon, and respectively divides the display target surface at the center of gravity of each convex polygon. A boundary condition icon is displayed. According to the present invention, when the display target surface is a concave polygon, a boundary condition icon is displayed at each barycentric position of a plurality of convex polygons obtained by dividing the display target surface. The position of the center of gravity of the concave polygon may exist outside the polygon, and simply displaying it at the position of the center of gravity will display the boundary condition icon outside the analysis target surface (display target surface), that is, on another surface. In some cases, it is inconvenient to check the analysis target surface. However, by dividing the display target surface into a plurality of convex polygons and displaying the boundary condition icons at the positions of the centers of gravity of the respective convex polygons as in the present invention, the positions of the centers of gravity of the convex polygons are always inside the polygons. Therefore, the boundary condition icon is reliably displayed inside the analysis target surface (display target surface), and the work of confirming the position of the analysis target surface, the work of confirming the set boundary condition, and the like are facilitated.

Further, according to the present invention, when there is a hole in a display target surface or a plurality of convex polygons, the boundary condition display control means divides the polygon into a plurality of convex polygons excluding the holes, and A boundary condition icon is displayed at each position of the center of gravity of the rectangle. According to the present invention, when there is a hole in the display target surface or in a plurality of convex polygons, the hole is divided into a plurality of convex polygons excluding the holes, and a boundary condition icon is provided at the center of gravity of each convex polygon. Is displayed. When a hole exists on a display target surface or the like, the position of the center of gravity may be located above the hole. At this time, if the boundary condition icon is displayed at the position of the center of gravity, the boundary condition icon may be displayed outside the analysis target surface (display target surface), that is, on another surface. Is inconvenient. However, by dividing the display target surface and the like into a plurality of convex polygons excluding holes as in the present invention and displaying the boundary condition icons at the positions of the centers of gravity of the respective convex polygons, the boundary condition icons can be reliably analyzed. Since the information is displayed inside the target surface (display target surface), the work of confirming the position of the analysis target surface, the work of confirming the set boundary conditions, and the like are facilitated.

[0016]

FIG. 1 is a block diagram showing a configuration of an analyzer 1 according to an embodiment of the present invention. The analysis device 1 is realized by a workstation or a personal computer, and generally includes an input device 2, a shape processing device 3, and a display device 4.

The input device 2 is composed of, for example, a keyboard, a mouse, a digitizer, etc.
It includes a plane selection processing unit 6 and a display mode input processing unit 7. The shape input processing unit 5 inputs a three-dimensional shape of an analysis target object such as an electronic device. At this time, if the object to be analyzed is composed of a plurality of parts, the joining relation between the parts is also input. The plane selection processing unit 6 selects an analysis target plane for setting various boundary conditions from the input analysis target objects. The display mode input processing unit 7 inputs a display mode of the input analysis target object, for example, a magnification and a display direction. The display direction includes a perspective view, a plan view, a side view, and a bottom view.

The shape processing device 3 includes a shape storage unit 8, a boundary condition setting unit 9, an analysis calculation unit 10, and an analysis result storage unit 1.
1 is included. The shape storage unit 8 stores the three-dimensional shape of the analysis target object input from the shape input processing unit 5. At this time, each surface of the analysis target object is stored with a surface number for identifying the surface. When the object to be analyzed is composed of a plurality of parts, the joint part where one part of the surface is joined to another surface is stored as a hole based on the joint relationship between the parts. Is done.

The boundary condition setting unit 9 sets boundary conditions for the analysis target surface selected by the surface selection processing unit 6 based on the shape stored in the shape storage unit 8. Analysis calculation unit 10
Performs an analysis calculation on the analysis target surface according to the boundary conditions set by the boundary condition setting unit 9. The analysis result storage unit 11 stores a result of the analysis calculation by the analysis calculation unit 10.

The display device 4 includes a shape display control unit 12, a boundary condition display control unit 13, an analysis result display control unit 14,
And a display unit 15. The shape display control unit 12 displays the analysis target object on the display unit 15 based on the contents stored in the shape storage unit 8 and the display mode input from the display mode input processing unit 7. The boundary condition display control unit 13 includes a boundary condition setting unit 9
Is displayed on the analysis target surface of the analysis target object displayed on the display unit 15. Further, the boundary condition display control unit 13 displays a boundary condition icon on the analysis target surface of the analysis target object displayed on the display unit 15 according to a processing procedure described later. Analysis result display control unit 14
Displays the analysis result stored in the analysis result storage unit 11 on the display unit 15.

FIG. 2 is a process chart showing the processing procedure of the analyzer 1. In step a1, the shape of the analysis target object is input from the shape input processing unit 5. In step a2, a boundary condition is set by the boundary condition setting unit 9 on the analysis target surface selected by the surface selection processing unit 6. In step a3, the analysis calculation is performed by the analysis calculation unit 10. In step a4, the designer makes an evaluation based on the result of the analysis calculation, returns to step a2, selects another analysis target surface, and repeats the analysis processing.
In step a5, the analysis result is displayed.

FIG. 3 is a flowchart for explaining the display processing of the boundary condition icon in the analysis device 1. In step b1, the analysis target surface is selected, that is, the boundary condition setting range is selected. The selection operation is performed, for example, on the display unit 15.
Is displayed, and a desired analysis target surface is designated by a mouse, or a surface number assigned to each surface of the analysis target object at the time of inputting a shape is designated by inputting from a keyboard.

In step b2, a portion (hereinafter, referred to as a "display target surface") of the selected analysis target surface displayed on the display unit 15 is detected. To detect the display target surface, for example, the analysis target object is virtually displayed in a specified display mode on a memory space of a VRAM (video ram), and a display frame corresponding to the display capacity of the display unit 15 is stored in the memory space. The coordinates of each vertex of the analysis target surface are obtained by overlapping. When all the vertices of the analysis target surface are present in the display frame, the analysis target surface defined by the obtained plurality of vertices and the connection relation between the vertices becomes the display target surface as it is. When at least one vertex of the analysis target surface exists outside the display frame, the coordinates of the intersection of the side of the analysis target surface cut by the display frame and the display frame are obtained, and the vertex of the analysis target surface existing in the display frame is determined. (Hereinafter referred to as “vertices of the display target surface”) and a surface defined by the connection relationship of these vertices are the display target surfaces. When the analysis device 1 is realized by a workstation, the analysis device 1 can be easily obtained by using clipping processing in the workstation.

More specifically, referring to FIG. 4, when an L-shaped analysis target surface 22 is displayed on the display screen 21, the analysis target surface 22 has six vertices A1, A2, A
3, A4, A5, A6 and the connection relationship (A1-A2-A3
-A4-A5-A6-A1). By superimposing a display frame 25 defining the display screen 21 in a state where the analysis target surface 22 is virtually displayed in the memory space, the analysis target surface 22 has two regions 2.
It is divided into 3, 24. A hatched area 23 is an area within the display frame 25, and this area 23 is a display target surface. Display frame 25 and line segment A1A6, A2A of analysis target surface
Assuming that the intersections with 3 are B1 and B2, respectively, the display target surface 23 is defined by four vertices A1, A2, B2, and B1 and a connection relationship (A1-A2-B2-B1-A1).

Referring again to FIG. 3, in step b3,
The shape of the display target surface is classified into a convex polygon or a concave polygon.
A convex polygon is one in which the interior angles of all vertices of the polygon are all less than 180 degrees. The interior angle of the polygon may be determined using the cosine theorem, for example, considering a triangle formed by a vertex for which the interior angle is to be obtained and two other vertices connected to the vertex. If it is a convex polygon, the process proceeds to step b5, and if it is a concave polygon, the process proceeds to step b4.

In step b4, the display target surface is divided into a plurality of convex polygons. Various known methods can be used for this division processing.
(Asakura Publishing Co., Ltd., written by Asano) The method described in Chapter 6 “Decomposition of Polygonal Area into Basic Figures” is used. In this method, a concave polygon is divided into trapezoids by drawing a horizontal line from the vertex of the concave polygon toward the inside of the polygon area.
In the present method, since the vertices of the holes in the polygon are also divided in the same manner, the result is a set of convex polygons without holes.

In step b5, there is a hole in the display target surface which is a convex polygon or a plurality of convex polygons obtained by division (hereinafter, collectively referred to as "convex polygon" including the display target surface). Detect whether or not. The holes are detected based on the contents stored in the shape storage unit 8. The holes include a true hole and a joint surface to which other parts grasped as the hole are joined. If there is no hole, the process proceeds to step b7. If there is a hole, the process proceeds to step b6.

At step b6, the convex polygon with holes is divided into convex polygons without holes. All holes are stored as polygonal areas, even if the actual shape is a shape including a curve such as a circle. Can be.

In step b7, a boundary condition icon is displayed at the position of the center of gravity of the finally obtained convex polygon. In the display example of FIG. 4, since the display target surface 23 is a rectangle and thus a convex polygon, the boundary condition icon is displayed at the position of the center of gravity 26 of the display target surface 23. The display example in FIG.
This is a case in which the character-shaped analysis target surface 22 is entirely displayed on the display screen 21. Since the interior angle of the vertex A3 is 270 degrees, the analysis target surface 22 has two convex polygonal regions 27, 2
8 and the centroid positions 29, 30 of the respective regions 27, 28
Displays a boundary condition icon.

In the display example of FIG. 6, a rectangular analysis target surface 31 having a hole 32 is displayed. The analysis target surface 31 is divided into four convex polygon regions 33, 34, 35, and 36. Center of gravity position 3 of each area 33, 34, 35, 36
Boundary condition icons are displayed at 7, 38, 39, and 40, respectively.

As described above, according to the present embodiment, the analysis target surface 22 is displayed at the center of gravity position 26 of the display target surface 23 displayed on the display unit 15 of the analysis target surface 22, so that the analysis target surface has any shape. The boundary condition icon will always be displayed, even if it is present or if only a part is displayed. By viewing the boundary condition icon, the user can check whether the boundary condition is set for the desired analysis target surface, and if there is an error, can perform operations such as correction, thereby improving convenience and operation. And work efficiency are improved.

When the display target surface 22 is a concave polygon as shown in FIG. 5, each of the centroid positions 29, 28 of a plurality of convex polygonal regions 27, 28 obtained by dividing the display target surface 22 is obtained.
A boundary condition icon is displayed at 30. Since the position of the center of gravity of the display target surface 22, which is a concave polygon, exists outside the display target surface 22, simply displaying at the position of the center of gravity means outside the analysis target surface (display target surface) 22, that is, another surface. The boundary condition icon may be displayed on the upper part, and it is inconvenient to check the analysis target surface 22 or the like. However, the display target surface 22 is divided into a plurality of convex polygonal regions 27 and 28,
By displaying the boundary condition icons at the centers of gravity 29, 30 of the convex polygon regions 27, 28, respectively, the center of gravity of the convex polygon always exists inside the polygon, so that the boundary condition icons can be reliably analyzed. Since the image is displayed inside the plane (display target plane), the work of checking the position of the analysis target plane, the work of checking the set boundary conditions, and the like are facilitated.

Further, as shown in FIG.
When there is a hole 32 inside the hole, the hole 32 is divided into a plurality of convex polygonal regions 33, 34, 35, and 36, excluding the hole 32, and the centers of gravity 37, 38 of the respective convex polygonal regions 33, 34, 35, and 36. ,
Boundary condition icons are displayed at 39 and 40, respectively.
When a hole exists on a display target surface or the like, the position of the center of gravity may be located above the hole. At this time, if the boundary condition icon is displayed at the position of the center of gravity, the analysis target surface (display target surface)
, That is, a boundary condition icon may be displayed on another surface, and it is inconvenient to check the analysis target surface. However, by dividing the display target surface and the like into a plurality of convex polygons excluding the holes and displaying the boundary condition icons at the positions of the centers of gravity of the respective convex polygons, the boundary condition icons can be surely analyzed. Since it is displayed inside the surface, the work of confirming the position of the analysis target surface, the work of confirming the set boundary conditions, and the like are facilitated.

[0034]

As described above, according to the present invention, in the conventional analyzer, the boundary condition icon is not displayed on the analysis target surface, and it is difficult to know which surface has been set. However, since the boundary condition icon is always displayed inside the analysis target surface, the work of checking the position of the analysis target surface, the work of checking the set boundary condition, and the like can be performed easily, and the work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an analyzer 1 according to an embodiment of the present invention.

FIG. 2 is a process chart showing a processing procedure of the analyzer 1.

FIG. 3 is a flowchart illustrating a display process of a boundary condition icon in the analysis device 1.

FIG. 4 is a diagram showing a display example of a boundary condition icon by the analysis device 1.

FIG. 5 is a diagram showing another display example of the boundary condition icon by the analyzer 1.

FIG. 6 is a diagram showing still another display example of the boundary condition icon by the analysis device 1.

FIG. 7 is a perspective view showing an example of an analysis target object for performing a stress analysis.

FIG. 8 is a diagram showing a shape of a handle 41 for performing a stress analysis.

FIG. 9 is a diagram showing a modeled handle 41 for performing stress analysis.

FIG. 10 shows the position G of the center of gravity of the analysis target surface 44 of the handle 41.
FIG.

FIG. 11 is a flowchart illustrating a process performed by a conventional analyzer.

FIG. 12 is a diagram showing a display example of a boundary condition icon in a conventional analyzer.

FIG. 13 is a diagram showing a display example of a boundary condition icon in a conventional analyzer.

FIG. 14 is a diagram showing a display example of a boundary condition icon in a conventional analyzer.

FIG. 15 is a diagram showing a display example of a boundary condition icon in a conventional analyzer.

FIG. 16 is a diagram showing a display example of a boundary condition icon in a conventional analyzer.

FIG. 17 is a perspective view illustrating the concept of a hole in the analysis target surface.

[Explanation of symbols]

 Reference Signs List 1 analysis device 2 input device 3 shape processing device 4 display device 5 shape input processing unit 6 surface selection processing unit 7 display mode input processing unit 8 shape storage unit 9 boundary condition setting unit 10 analysis calculation unit 11 analysis result storage unit 12 shape display Control unit 13 Boundary condition display control unit 14 Analysis result display control unit 15 Display unit 21 Display screen 22, 31 Analysis target surface 23 Display target surface 27, 28, 33, 34, 35, 36 Convex polygon region 26, 29, 30 , 37, 38, 39, 40 Center of gravity position 32 hole A1, A2, A3, A4, A5, A6 Vertex B1, B2 Intersection

Claims (3)

(57) [Claims] 1. A display unit, a shape input unit for inputting a three-dimensional shape of an object to be analyzed, a shape storage unit for storing a shape input by the shape input unit, and an object to be analyzed displayed on the display unit Display mode input means for inputting a display mode such as magnification, direction, and the like, and an analysis target object is displayed on the display module based on the storage content of the shape storage module and the display mode input from the display mode input module. Shape display control means to be displayed, surface selection means for selecting an analysis target surface from the analysis target object, boundary condition setting means for setting boundary conditions for the analysis target surface selected by the surface selection means, and the boundary condition setting A boundary condition storage means for storing the boundary condition set by the means; and, based on the storage contents of the boundary condition storage means, the analysis target surface displayed on the display means. Boundary condition display control means for displaying a boundary condition, analysis calculation means for performing an analysis calculation based on the set boundary condition, analysis result storage means for storing an analysis result by the analysis calculation means, and analysis result storage Analysis result display control means for displaying the analysis result of the means on the display means, wherein the boundary condition display control means changes the shape of the display target surface displayed on the display means among the selected analysis target surfaces. An analysis apparatus that detects and displays a boundary condition icon indicating that a boundary condition is set on an analysis target surface at a position of a center of gravity of the display target surface. 2. When the display target surface is a concave polygon, the boundary condition display control means divides the display target surface into a plurality of convex polygons, and sets a boundary condition icon at each barycentric position of each convex polygon. The analysis device according to claim 1, wherein is displayed. 3. When there is a hole in a display target surface or a plurality of convex polygons, the boundary condition display control means divides the polygon into a plurality of convex polygons excluding the holes, and a center of gravity of each convex polygon. The analysis device according to claim 2, wherein a boundary condition icon is displayed at each position.