【作者】 王晓枫；

【导师】 孙立镌；

【作者基本信息】 哈尔滨理工大学 ， 计算机应用技术， 2004， 硕士

【摘要】 特征造型技术是新一代CAD/CAM集成系统的关键技术之一,是产品模型技术的核心。建立基于特征的统一而完备的产品信息模型,能够从根本上解决产品在设计、生产、质量控制和组织管理等各个环节的数据交换和共享问题。同时,将参数化技术引入设计系统中,使得特征具有可调整性,提高了系统设计效率。因此,基于特征的参数化技术已成为当今CAID系统的主要依赖手段之一。HUST-CAID(哈尔滨理工大学计算机辅助工业造型设计系统)是一种基于特征的参数化造型设计系统。该系统在基于B-rep、CSG树和特征描述树(FDT)的混合模型基础之上,利用重用CSG树与特征描述树的技术,来完成实体模型的设计与编辑工作。但在特征造型过程中,随着造型体数目的增加,设计模型将变得越来越复杂,由此导致了系统设计效率的降低。为了能够正确地维护设计者的设计意图和满足用户的需求,本文在原系统的基础之上,提出了特征造型的定义及确认方案,给出了特征造型的自动调整策略,提出了系统原有管理体系之下约束关系管理的方法。同时对系统原有约束求解和特征编辑过程进行了研究,并在原有方法基础之上提出了一套新的求解方法。更多还原

【Abstract】 Feature modeling is one of important techniques in integrated system of CAD or CAM, which is a key to product modeling. The integral model of product information based on feature should be built, which can solve data exchanging and data sharing in the process of designing, production, quality-controlling, and organization-management. At the same time, the parametric design technique is applied to feature-based design system, where the feature can be adjusted, which improves the efficiency of designing process. So, the parametric design technique based on feature has become very important in most CAID systems.HUST-CAID (Computer Aided Industry Design System developed by Harbin University of Science and Technology) is a parametric modeling design system based on feature. This system describes entities based on mixed model of boundary representation、CSG tree and feature description tree (FDT), in which the design of solid model and feature-editing can be completed with rebuilding CSG tree and feature description tree. But, in the feature modeling, with the number of features increasing, the design model becomes more and more complex. The efficiency of designing is decreased.In order to maintain the intent of designers and satisfy them, a new management system of feature model definition and validation is put forward based on old design system. Methods of automatic adjustment of invalid feature models are illustrated in this system. After the research of methods of constraint-solving and feature-editing in old system, a new way of constraint-solving is presented.更多还原