利用用户定义特征实现基于约束设计

摘要

A constraint-based generic mechanism is proposed for defining andinstancing user-defined features, which are managed by constraint based library functions to realize feature-based design paradigm. This mechanism not only speeds up the design process and facilitates the representation of assembly constraints and manufacturing constraints in and among user-defined features in detail design phase, but also lays foundation to binding user-defined features with function elements of product, thus supporting computer-aided conceptual design and establishing integrated product model based on user-defined features. The mechanism is realized on Lonicera, a self-developed CAD/CAM integrated system and a case study of aeroengine rotor design is illustrated.%提出了基于约束的用户定义特征（User DefinedFeature,UDF）定义与实例化的通用机制及基于约束的特征库管理，并应用于国产CAD/CAM软件金银花（Lonicera）系统，以航空发动机转子为例，建立了转子特征库，对系统功能进行了验证.该项工作既为详细设计阶段考虑装配约束和制造约束提供了方便，提高了设计效率，也为将用户定义特征与产品功能相联系、以支持计算机辅助概念设计打下了基础.