层次参数化的自由曲面特征表示与实现  

Parametric Representation and Implementation of Freeform Surface Feature Based on Layered Parameters

作　　者：何坤金[1] 赵宗星 耿维忠[1] 陈正鸣[1] 朱英[1] 

机构地区：[1]河海大学物联网工程学院,常州213022

出　　处：《计算机辅助设计与图形学学报》2014年第5期826-834,840,共10页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(61073066)

摘　　要：为了解决自由曲面特征参数化问题,提出一种自由曲面特征参数分层实现框架.采用从高层到底层、从整体到局部的分层思想,将自由曲面特征的参数及映射关系划分为"3层参数和2级映射"结构来定义曲面特征,即高层语义参数表示整体形状,中间层参数表示特征线和底层参数表示细节形状,并在各层参数间建立映射和约束关系;同时支持设计者用Scheme命令快速实例化曲面特征.该方法避免了传统方式中由高层特征参数到底层数据间直接的复杂映射关系,且方便了曲面特征的实例化.实验结果表明,文中方法使得设计者能够从特征语义层直观地编辑修改自由曲面特征,是一种有效的自由曲面特征参数化表示和实现方法.To solve the problem of parametric representation of freeform surface feature, a framework for multi-level parametric definition and implementation of freeform surface feature is proposed. The method parameterizes freeform surface feature step by step from global to local shape and from high to low level. A framework of three-level parameters and two-grade mappings is put forward to define freeform surface feature, that is, three-level parameters including high semantics parameters, middle- level characteristic curve and low-level shape data. Furthermore, mappings and constraints are built up between three levels. Last, it supports users to instantiate the feature by Scheme command. The method avoids the traditional complex mapping relation directly between the high-level feature parameters and the bottom data. Experiments show that the above method is convenient for users to intuitively edit and modify freeform surface feature with high-level parameters. It can effectively express freeform surface feature.

关 键 词：自由曲面特征 特征线 参数分层 映射关系 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术]