APPARATUS AND METHOD FOR GENERATING ANALYSIS MODEL

• US 20090271156A1
• Filed: 04/27/2009
• Published: 10/29/2009
• Est. Priority Date: 04/28/2008
• Status: Abandoned Application

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kageura, Masaru
• Application Number:
  US12/430,727
• Publication Number:
  US 20090271156A1
• Time in Patent Office: Days
• US Class Current: 703/1
• CPC Class Codes: G06F 2113/22 Moulding
• CPC Class Codes: G06F 2113/24 Sheet material
• CPC Class Codes: G06F 30/23 using finite element methods [FEM] or finite difference methods [FDM]
• CPC Class Codes: G06T 17/20 Finite element generation, e.g. wire-frame surface description, tesselation

Abstract

A shape of an analysis target is partitioned into partitioned shapes using CAD information data for the analysis target, and adjacent-relationship information indicating an adjacent relationship between the partitioned shapes is generated. Then, a modeling type to be performed on each of the partitioned shapes is set. Then, a mid-surface for a partitioned shape in which a shell is set as the modeling type is extracted. Then, the adjacent-relationship information is referred to, and two or more mid-surfaces extracted from adjacent partitioned shapes are integrated into a combined mid-surface. Then, a shell mesh for the combined mid-surface and a solid mesh for a partitioned shape in which a solid is set as the modeling type are created. The adjacent-relationship information is referred to, and constraint elements that link a shell mesh and a solid mesh that are adjacent to each other are inserted.

Claims

1. An apparatus for generating an analysis model, the apparatus comprising:

a partitioning unit configured to partition a shape of an analysis target into multiple partitioned shapes using CAD information data for the analysis target;

an adjacent-relationship information generating unit configured to generate adjacent-relationship information indicating an adjacent relationship between the multiple partitioned shapes;

a setting unit configured to set a modeling type for each of the multiple partitioned shapes;

a mid-surface extracting unit configured to extract a mid-surface for a partitioned shape in which a shell is set as the modeling type by the setting unit;

an integrating unit configured to refer to the adjacent-relationship information and integrate two or more mid-surfaces extracted from adjacent partitioned shapes into a combined mid-surface;

a shell-mesh creating unit configured to create a shell mesh for the combined mid-surface;

a solid-mesh creating unit configured to create a solid mesh for a partitioned shape in which a solid is set as the modeling type by the setting unit; and

an inserting unit configured to refer to the adjacent-relationship information and insert constraint elements that link a shell mesh and a solid mesh that are adjacent to each other.

2. The apparatus for generating an analysis model according to claim 1, wherein the integrating unit includes a mid-surface correcting unit configured to correct positions of mid-surfaces constituting the combined mid-surface.

3. The apparatus for generating an analysis model according to claim 2, wherein mid-surface correcting unit includes a projected-point generating unit, a projected-point correcting unit, and a vertex correcting unit,

wherein the projected-point generating unit is configured to, among vertices of a first mid-surface of the mid-surfaces, project a separation boundary surface vertex on a second mid-surface with which the first mid-surface is integrated, the separation boundary surface vertex being present in a separation boundary surface generated on the multiple partitioned shapes together with the partitioning performed by the partitioning unit, and to generate a projected point,

the projected-point correcting unit is configured to, when another projected point generated from another mid-surface is present within the second mid-surface at which the projected point is generated, if a distance between the projected points is equal to or smaller than a predetermined value, perform correction such that the projected points are located at a position of one of the projected points, and

the vertex correcting unit is configured to perform correction such that the separation boundary surface vertex is located at the position of the projected point.

4. The apparatus for generating an analysis model according to claim 3, wherein the mid-surface correcting unit further includes a second projected-point correcting unit configured to, when a projected edge line obtained by projecting an edge line of another mid-surface is present within the second mid-surface at which the projected point is generated, if a distance between the projected point and the projected edge line is equal to or smaller than a predetermined value, perform correction such that the projected point is located in the projected edge line.

5. The apparatus for generating an analysis model according to claim 1, wherein the partitioning unit includes a side-face extracting unit, a convex-shape partitioning unit, a surface-set acquiring unit, a separation boundary loop extracting unit, a boundary-surface creating unit, and a partitioned-shape generating unit,

wherein the side-face extracting unit is configured to extract a side face of the analysis target,

the convex-shape partitioning unit is configured to partition the side face into a convex-shape surface,

the surface-set acquiring unit is configured to acquire a set of surfaces retrieved by searching for side faces that exist before the partitioning performed by the convex-shape partitioning unit and that are in a convex or parallel relationship from side faces of the analysis target,

the separation boundary loop extracting unit is configured to extract a separation boundary loop indicating a boundary for each set of surfaces,

the boundary-surface creating unit is configured to create, on the separation boundary loop, a separation boundary surface for a first set of surfaces and a separated boundary surface for a second set of surfaces, and

the partitioned-shape generating unit is configured to, for each set of surfaces, generate a partitioned shape having a surface forming the set of surfaces and having one of the separation boundary surface and the separated boundary surface.

6. The apparatus for generating an analysis model according to claim 5, wherein the convex-shape partitioning unit includes a concave-vertex extracting unit, a diagonal-line creating unit, and a side-face dividing unit,

wherein the concave-vertex extracting unit is configured to extract a concave vertex between concavely adjacent edge lines within the side face,

the diagonal-line creating unit is configured to create a diagonal line between adjacent concave vertices of the side face on the separation boundary loop, and

the side-face dividing unit is configured to divide the side face at the diagonal line into the convex-shape surface.

7. The apparatus for generating an analysis model according to claim 5, wherein the adjacent-relationship information generating unit is configured to cause information that identifies a combination of the separation boundary surface and the separated boundary surface and information that identifies a partitioned shape containing the separation boundary surface and a partitioned shape containing the separated boundary surface to be included in the adjacent-relationship information.

8. The apparatus for generating an analysis model according to claim 5, wherein the boundary-surface creating unit includes a determining unit, a separation-vertex extracting unit, a separation boundary loop dividing unit, a duplicating unit, a separation boundary surface creating unit, and a separated boundary surface creating unit,

wherein the determining unit is configured to determine that surfaces containing a pair of adjacent edge lines on the separation boundary loop form the same boundary surface at least one of when the pair of adjacent edge lines are adjacent to the same surface, when surfaces adjacent to the pair of adjacent edge lines are geometrically the same, and when a surface adjacent to either one of the pair of adjacent edge lines is a side face,

the separation-vertex extracting unit is configured to extract a vertex between edge lines forming different boundary surfaces as a separation vertex,

the separation boundary loop dividing unit is configured to create an edge line between two adjacent separation vertices on the separation boundary loop, divide the separation boundary loop, and determine a separation boundary loop that has no separation vertex other than the two adjacent separation vertices as a division boundary loop,

the duplicating unit is configured to duplicate the division boundary loop,

the separation boundary surface creating unit is configured to create a separation boundary surface on the division boundary loop before the duplicating performed by the duplicating unit, and

the separated boundary surface creating unit is configured to create a separated boundary surface on the division boundary loop generated by the duplicating performed by the duplicating unit.

9. A method for generating an analysis model, the method comprising:

partitioning a shape of an analysis target into multiple partitioned shapes using CAD information data for the analysis target;

generating adjacent-relationship information indicating an adjacent relationship between the multiple partitioned shapes;

setting a modeling type for each of the multiple partitioned shapes;

extracting a mid-surface for a partitioned shape in which a shell is set as the modeling type;

referring to the adjacent-relationship information and integrating two or more mid-surfaces extracted from adjacent partitioned shapes into a combined mid-surface;

creating a shell mesh for the combined mid-surface;

creating a solid mesh for a partitioned shape in which a solid is set as the modeling type; and

referring to the adjacent-relationship information and inserting constraint elements that link a shell mesh and a solid mesh that are adjacent to each other.

10. A storage medium that stores a computer-readable program allowing a method for generating an analysis model according to claim 9 to be achieved using a computer.