摘要
根据基于反求工程获得的零件模型信息,研究产品的几何尺度快速计算方法。三维物体尺度计算实质是在空间求取模型最小外接长方体问题,提出三次投影和旋转变换策略,把复杂的三维问题转化为二维平面问题。采用最佳拟合直线方法,计算产品模型投影轮廓多边形的长轴方位,并据此计算旋转变换所需转动角度。最后,针对变换后的零件模型,求取与坐标平面正交的外接长方体,以获得模型的三向尺度。
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 transformation 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 transformed 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.
出处
《机械设计》
CSCD
北大核心
2005年第4期49-51,共3页
Journal of Machine Design
基金
西南交通大学科学研究基金资助项目(2003B04)
关键词
反求工程
模型评价
尺度计算
计算机辅助设计
reverse seeking engineering
model evaluation
dimension calculation
CAD
