计算机工程与应用 ›› 2009, Vol. 45 ›› Issue (16): 83-86.DOI: 10.3778/j.issn.1002-8331.2009.16.023

• 研发、设计、测试 • 上一篇    下一篇

语义特征模型中参数范围的计算

孙立镌,谢立强,刘瑞龙   

  1. 哈尔滨理工大学 计算机科学与技术学院,哈尔滨 150080
  • 收稿日期:2008-04-21 修回日期:2008-07-11 出版日期:2009-06-01 发布日期:2009-06-01
  • 通讯作者: 孙立镌

Approach to calculate parameter ranges of semantic feature modelling

SUN Li-quan,XIE Li-qiang,LIU Rui-long

  

  1. Computer Science & Technology College,Harbin University of Science and Technology,Harbin 150080,China
  • Received:2008-04-21 Revised:2008-07-11 Online:2009-06-01 Published:2009-06-01
  • Contact: SUN Li-quan

摘要: 基于参数和语义特征的CAD系统,改变参数的值是最重要的操作,也通常是一种反复性的过程,针对适合的参数值对于用户来说提前是不知道的,提出一种新的方法用于自动侦测参数的适当的范围。先通过分析拓扑约束图,找到距离和角度约束,并将这些约束加入到其相应的几何约束中,然后通过分解找到子问题的临界参数值,再求解每个并列的参数区间内部的一个具体的实例,精确的参数范围就能够被确定。

Abstract: Based on parametric and semantic feature CAD systems,changing values of parameters is one of the most common operations,which is often a trial-and-error process.According to allowable parameter values are not known to the user beforehand,authors present a solution for automatically determining the allowable range for the parameter values.Authors find some distance or angle constraints by analyzing the graph of topological constraints and then put them into geometric constraints.Next,authors use the decomposition to find critical parameter values for sub-problems.By solving one problem instance for each interval between two subsequent critical values,the exact parameter ranges are determined for which a solution exists.