Title:
CAD DRAWING METHOD FOR AUTO MESHING OF FINITE ELEMENT METHOD MODEL
Document Type and Number:
WIPO Patent Application WO/2023/002639
Kind Code:
A1
Abstract:
[Problem] To provide a CAD drawing method for auto meshing of a finite element method model by which, in regard to drawing in which any angle is divided into equal parts, errors are reduced in comparison to conventional drawing methods while maintaining a simple procedure such that said method can be put to practical use. [Solution] Provided is a CAD drawing method for auto meshing of a finite element method model in which an intersection angle XOY between a straight line OX and a straight line OY is divided into N equal parts, the CAD drawing method comprising: a step for determining a point A1 on a straight line OX and a point B1 on a straight line OY such that OA1 = OB1 is satisfied; a step for connecting the point A1 on the straight line OX and the point B1 on the straight line OY to create a triangle A1OB1; a step for creating an equilateral triangle A1B1O' in which a side A1B1 serves as one side; a step for defining, as A2 and B2, points where a straight line passing through a center O11 of a circumscribed circle of the equilateral triangle A1B1O' and parallel to A1B1 intersects AO' and BO', respectively, while defining a midpoint of A1B1 as O12; a step for determining intersection points C1' for A2B1 and B2O12, and point C1 for A1B2 and A2O12, respectively; and a step for defining, as E1 and E1', points where respective extension lines O'C1 and O'C1' intersect A1B1. Through these steps, A1B1 is divided into three equal parts by E1 and E1'. The CAD drawing method also comprises: a step for determining an intersection point F1 between A2B2 and O'C1, and an intersection point F1' between A2B2 and O'C1'; a step for determining an intersection point O13 between O'O12 and a side A1B2 or a side A2B1 and determining, as G1 and G1', points at which a line segment passing through O13 and parallel to A1B1 intersects O'E1 and O'E1'; a step for, in the equilateral triangle A1B1O', extracting O12E1, O13G1, and C1'C1' as a first line segment group parallel to the side A1B1, extracting O12C1, O13F1, and O13E1 as a second line segment group inclined in relation to the side A1B1, and extracting a third line segment group on O'O12 orthogonal to the side A1B1; a step for determining n of an equilateral triangle AnBnO' according to an applied number of divisions N, and drawing from the equilateral triangle A1B1O' to the equilateral triangle AnBnO'; a step for selecting either the first or second line segment group and determining which line segment of the selected line segment group to use as a reference line L; a step for using the determined reference line L to divide, from A1 or B1, a circumscribed circle into N arcs inside of the triangle A1OB1; and a step for connecting O to each point on the divided circumscribed circle. Through these steps, if the intersection angle XOY is an acute angle, N equally dividing lines of the intersection angle XOY are drawn, and if the intersection angle XOY is an obtuse angle, points at which each line segment connecting O to each point on the divided circumscribed circle intersects AO13 and BO13 are determined, and each intersection point on AO13 and BO13 is connected to O, and thereby N equal parts of the intersection angle XOY are drawn.
More Like This:
Inventors:
GOTOU KIMIJI (JP)
Application Number:
PCT/JP2021/036695
Publication Date:
January 26, 2023
Filing Date:
October 04, 2021
Export Citation:
Assignee:
GOTOU KIMIJI (JP)
International Classes:
G06F30/23; G06F30/12
Domestic Patent References:
| WO2020113268A1 | 2020-06-11 |
Foreign References:
| JPH09327998A | 1997-12-22 | |||
| JPS5546999A | 1980-04-02 |
Attorney, Agent or Firm:
OKA Kiyoshi (JP)
Download PDF: