反向工程几何建模自动化系统  

Reverse- Engineering Automatic Geometry Modelling System

作　　者：史桂蓉[1] 邢渊[1] 张永清[1] 

机构地区：[1]上海交通大学国家模具CAD工程研究中心,上海200030

出　　处：《上海交通大学学报》2000年第3期392-395,共4页Journal of Shanghai Jiaotong University

摘　　要：反向工程是利用实物模型测得的数据,构造CAD模型,继而进行分析制造.几何建模是反向工程的关键技术,目前反向工程几何建模存在以下不足之处:(1)通用性差;(2)交互操作多;(3)大自由曲面拟合能力差;(4)系统集成度低.针对以上缺点,提出了反向工程几何建模自动化系统,利用柯西(Kohonen)自组织特征映射人工神经网络进行区域分割;利用具有特殊基函数的人工神经网络实现曲面几何参数的提取,网络权值代表B-样条曲线曲面的控制顶点;The existing reverse- engineering geometry modelling ( REGM) system has some shortcomings: 1 requiring certain data formats( slice data,or ramge data,or grid data,) 2 too much inter- actions;3 disable to process large data of free- form surface;4 low integration degree.This paper discussed an REGM automatic system,which overcomes the disadvantages of the present reverse- engineering. It intro- duced systematically the applications of artificial neural network in reverse- engineering:1 segmentation by Kohonen self- organizing feature map( SOFM) metwork;2 a new approach called the adaptive basis function network is developed and investigated for the curve and surface fitting process.The control points of B- spline basis functions are defined as the weights of the network;3expressing CAD model by SOFM's topology preserving mapping.

关 键 词：反向工程 几何建模 CAD 自动化系统 产品设计 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术] TB21[自动化与计算机技术—计算机科学与技术]