摘要
针对反求工程中常见的过渡曲面特征 ,提出了一种过渡曲面特征的提取算法。该算法包括数据分块和过渡曲面参数提取两部分。在数据分块算法中 ,通过数据精简、曲率估算和曲率比较等步骤 ,将过渡区域的数据点从原始点云数据中分离出来 ;在过渡曲面参数提取算法中 ,通过圆柱拟合和过渡区域跟踪算法 ,计算出一系列过渡曲面的截面线。该算法和已有的过渡曲面特征提取算法相比 ,无需人工交互 ,而且适用于等半径过渡曲面特征和变半径过渡曲面特征。
A new method to extract blend surface feature is presented according to the common features of blend surface in reverse engineering. The method contains two steps: the segmentation and recovery of parametric representation of the blend surface. The segmentation separates the points in the blend region from the rest of the input point cloud with the processes of reduction of point data, estimation of local surface curvature properties and comparison of maximum curvature values. The recovery of parametric representation generates a set of profile curves by marching throughout the blend region and fitting cylinders. Compared with the existing approaches of blend surface feature extraction, the proposed method doesn't require user interaction and is capable of extracting blend surfaces with either constant radius or variable radius.
基金
美国通用电气公司研究开发中心和国家高技术研究发展计划联合资助项目 ( 86 3-5 11-942 -0 18)~~
