关键词: 虚拟装配, 数据转换, 层次

Abstract: To obtain data from CAD system is the first step for virtual assembly system. A multi-layer component information expression structure model in virtual assembly was proposed. The model consisted of polygon layer, B-Rep layer, feature layer and component layer in virtual environment. Reconstruction method of component information model in virtual environment was proposed. The information in component layer and B-Rep layer were constructed based on the additional data exported from the CAD models. The link between B-Rep layer and polygon layer was established through a surface-polygon mapping mechanism. This method has solved the data transformation between CAD system and virtual assembly system very well. At last, a prototype system was established and its feasibility was verified by research result.

Key words: virtual assembly, data transformation, multi-level model, assembly