Title

反求建模中的模型尺度計算方法

Translated Titles

Dimension Calculation Method of Model in Reverse Seeking Modeling

Authors

田懷文(Huai-Wen Tian);張愛軍(Ai-Jun Zhang);李濤(Tao Li)

Key Words

反求工程 ; 模型評價 ; 尺度計算 ; 計算機輔助設計 ; reverse seeking engineering ; model evaluation ; dimension calculation ; CAD

PublicationName

機械設計

Volume or Term/Year and Month of Publication

22卷4期(2005 / 04 / 20)

Page #

49 - 51

Content Language

簡體中文

Chinese Abstract

根據基於反求工程獲得的零件模型信息,研究產品的幾何尺度快速計算方法。三維物體尺度計算實質是在空間求取模型最小外接長方體問題,提出三次投影和旋轉變換策略,把複雜的三維問題轉化為二維平面問題。採用最佳擬合直線方法,計算產品模型投影輪廓多邊形的長軸方位,並據此計算旋轉變換所需轉動角度。最後,針對變換後的零件模型,求取與坐標平面正交的外接長方體,以獲得模型的三向尺度。

English Abstract

On the basis of the obtained model information of components based on reverse seeking engineering, a rapid calculation method for geometric dimensions of product was studied. The essence of dimension calculation of 3D objects is the issue of seeking and fetching the smallest circumscribed cuboid in space. Strategies of cubic projection and rotation trans formation were put forward in this paper in order to transform the complicated 3D issues into 2D planar issues. By the use of optimal matching straight-line method to calculate the major axis orientation of projective contour polygon of product model, and in view of the above the turning angle needed for rotation transformation was calculated. Finally, aimed at the trans formed component model, seek and fetch the circumscribed Cuboid that is orthogonal with coordinate plane in order to obtain the three directional dimensions of the model.

Topic Category 工程學 > 工程學綜合
工程學 > 機械工程