语义特征造型系统中特征模型转换的研究.pdf

Computer Engineering and Applications计算机工程与应用
2010,46(12)149
语义特征造型系统中特征模型转换的研究
陈立伟12,韩磊,王远志,孙立镌5
CHEN Li-wei2, HAN Lei, WANG Yuan-zhi,, SUN Li-juan'
1.西南科技大学计算机科学与技术学院,四川绵阳621010
2.西南交通大学CAD工程中心,成都610031
3.山东服装职业学院信息工程系,山东泰安27100
4.安庆师范学院计算机系,安徽安庆246011
5.哈尔滨理工大学计算机科学与技术学院,哈尔滨150080
1. College of Computer Science and Technology, Southwest University of Science and Technology, Mianyang Sichuan 621010, China
2. CAD Engineering Center, Southwest Jiaotong University, Chengdu 610031, China
3. Department of Infommation Engineering, Shandong Vocational College of Clothing, Tai an, Shandong 271000, China
4.computerDepartment,AngingNormalCollegeAnging,Anhui246011,China
5. School of Computer Science and Technology, Harbin University of Science and Technology, Harbin 150080, China
CHEN Li-wei, AN i WANG Yuan-zhi, et al. Research on feature conversion in semantic feature modelin systems
Computer Engineering and Applications, 2010, 46(12): 149-152.
Abstract: This paper analyzes the semantic eature modeling of new generation, consults research results of Bidara etc, uses vali-
dity criterion, and establishes methods of feature conversion to semantic feature modeling Based on the mathematical methods, this
paper addresses the problem how to convert the design feature representation into machining feature representation in a mathe
matical model Design features in the design domain are represented by a set of faces of each feature geometry and a set of attributes
such as dimensions and material feature Machining features in the manufacturing domain are represened by a number of faces
and relationships between these faces that are meaningful for the process operations Using a mathematical description of the fea
ture mapping process, machining features can be deduced and formed by the set operation, and the difficult problem of feature
interaction can be described mathematically and converted in theory, thus to make product model editing easier
Key words: semantic feature modeling; feature conversion; feature recognition
摘要:通过对新一代的语义特征模型的分析,参考 Bidarra等人的研究成果,运用有效性标准,确立语义特征造型中特征转换的
方法,在米用数学方法基融上,提出了怎样在数学模型中把设计特征表示转换成加工特征表示。设计过程中的设计特征由一组異
有几何特征的面和一组属性(包括维数和具体特征)表示。加工过程中的加工特征由许多面和这些加工操作中面面之间有意义的
关系来表示。特征转換中采用数学方法,能够在集合运算中形成加工特征,特征相交这种困难问题也可用数学描述,并且理论上能
够转换,从而提高产品模型的可编辑性和易编辑性。
关键词:语义特征造型;特征转换;特征识别
DOI:10.3778/jisn.1002-8331.2010.12.044文章编号:1002-8331(2010)12-0149-04文献标识码:A中图分类号:TP301
1引青
性,因设计人员更应从功能要求(设计特征)出发进行设计;
CAD/CAM集成的早期研究体现在从实体模型中提取加工是设计人员以设计特征进行设计建立设计特征模型,再由设计
特征,也就是特征识别技术。随着基于特征的设计方法的提出特征模型转换生成加工特征模型,这就是特征转换或特征映
和发展,人们开始从如下两个角度来实现设计与加工的集成:一射?。特征转换可通过对由设计特征模型生成的结果物体(实
是直接用加工特征进行设计,但这样限制了设计人员的创造体模型)进行特征识别得到加工特征模型.但这样做的结果是
基仓项目:国家自然科学基金( the National Natural Science Foundation of China under Grant No017305);四川省教育厅自然科学基金( the Nat-
ural Science Project of Sichuan Province Education Department of China under Grant No.,200076);安徽省教育厅自然科学基金(the
Natural Science Projeet of Anhui Province Education Department of China under Grant No.kKI2008A!87C);安省教育厅青年资助基
i( the Young Scholars Projeet of Anhui Province Education Deparment No. 2006jq1 208)
作者简介:陈立伟(1974-),男,博士研究生,讲师,研究方向为图像信息处理、智能CAD;韩磊(1972-),男,讲师,工程师,研究方向为计算机应用与
机电一体化;孙立钠(1944-),男,教授,博土生导师,主要研究领域为计算机图形学与CAD。
收稿日期:2008-10-10修回口期:2009-08-(06
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