Abstract: The model in current virtual assembly system is main geometrical model, and virtual assembly is deficient in the consideration about physical attribute, like mass and force so that the simulation result is inauthentic. Aiming at the problems above, the method on physical assembly process simulation based on multi-rigid-body dynamics in virtual assembly is presented so that assembly process simulation for parts with force input in virtual assembly is realized. The realization method of three key technologies in the method is described in detail: The technology of physical attribute modeling for physical assembly process simulation, the method of multi-rigid-body dynamics mathematic modeling and the method of rigid-body collision process simulation and analysis in virtual assembly. The method is implemented in proto-type system virtual assembly process planning(VAPP) and is validated through some examples.

Key words: Collision analysis, Multi-body rigid dynamics, Physical attribute, Virtual assembly