反求工程中复杂曲面边界线的自动提取技术

复杂曲面零件表面的几何模型构造是反求工程的研究重点之一 ,根据零件表面的数字化数据提取零件表面的边界是构造零件几何模型的关键步骤。针对完全散乱的、无组织的“点云”数据 ,从工程应用的角度出发 ,提出了一种自动构造曲面边界曲线的方法 ,它分为两个步骤 ,首先 ,利用分割方法得到一条能包围曲面的所有数字化点的曲线 ,然后将该曲线模拟为橡皮筋 ,通过能量最小原理自动修正曲线得到理想的曲面边界。实践证明 ,通过该方法得到的边界曲线能满足工程应用的需要

A Method for Extract Boundary of Complex Surface in Reverse Engineering

One of key research issues in Reverse Engineering is the geometric modeling of complex surface. Extracting boundary of complex surface from "points cloud" is a main step. It gives a practical method of boundary extracting from scattered and unstructured "points cloud". Firstly, a polyline can be obtained from the points set under the meshing, then the polyline is taken as an elastic band and smoothed with energy-minimum. An example is presented to verify the presented method.