An integrated representational model for concurrent assembly design and planning

In this paper, a class of generic place/transition (P/T) nets is first defined by incorporating knowledge-based system techniques. Using the knowledge P/T net formalisms, an integrated design object model, defined as a hierarchy of function-behavior, structure, geometry and feature, is then proposed based on the design with objects scheme, and used for a unified representation of assembly modeling, design and planning. This model is used as a uniform description for both on assembly level and feature based single part level, and allows designers to deal with incomplete, imprecise knowledge and uncertainty with the help of fuzzy logic in assembly oriented design process. It is also be used as a graphical language to specify the assembly process for assembly planning. Therefore, the developed model is an integrated representation for concurrent assembly design and planning