虚拟环境中装配设计语义的表达、传递与转化研究

研究了虚拟环境产品装配建模过程中装配语义的表达、装配语义与装配约束的转化技术，提出了采用语义－约束图对装配设计语义与约束进行维护。通过语义－约束图可以从语义层次和约束层次对产品装配模型进行编辑和维护。提出了采用模糊参量表达和处理产品装配设计中的模糊语义。基于模糊参量的语义表达不仅为设计信息输入提供了更大的自由度，而且扩展了计算机对模糊信息的处理能力，有利于产品设计意图的维护。通过产品装配信息从抽象到具体、从模糊到精确的转化，实现了虚拟装配设计系统对抽象、模糊设计信息的表达、传递与处理。

Design Semantics of Assembly Modeling in Virtual Environment:Expression,Transfer and Transformation

Virtual reality technology provides the designer a more intuitive and natural interface to perform product assembly design and analysis, which can imp rove the efficiency and quality of assembly modeling. The designer can express a nd transfer product assembly design information via voice and gesture in the virtual environment. Comparing with traditional interaction, the VR-based interactio n is more suitable to express the abstract and fuzzy design semantics that is es sential to assembly modeling. In this paper, the expression and transformation m ethod of design semantics is presented, which enable the designer specifies asse mbly relations via abstract semantics during assembly modeling. The abstract sem antics is transformed to assembly constraints, and SCG graph (Semantics Constrai nt Graph) is proposed to maintain the assembly semantics and constraints. Thus, the design system is able to manage the assembly model in a higher level. In ad dition, fuzzy parameter is proposed to express and deal with the fuzzy design in formation. The fuzzy semantics based on fuzzy parameter not only provides the de signer a more intuitive way to express design intents, but also can store and ma intain design intents. Through the transformation of design semantics, the abstr act and fuzzy information can be processed by the virtual assembly system.