Abstract:

Assembly sequence planning and motion simulation of the threedimensional model of heterogeneous platform require the model to be unified into a same platform. Therefore, a unified expression method of assembly model is proposed. This method unifies the different CAD model into the threedimensional model of the same structure. The mixed expression of partslevel model and relationship model is used to record the hierarchical structure, the assembled relationship, the motion relationship, and the related properties, etc, and a unified assembly expression method is built. In order to improve the efficiency of the model for information exchange and display at the same time, lightweight methods are adopted to construct and express the parts model.

Key words: heterogeneous platform;unified platform;lightweight;assembly expression