关键词: 公差建模, 虚拟环境, 产品双耦合公差模型

Abstract: According to the special requirements and characteristics of product model in virtual environment, the conception of product toleranced model was proposed. After analyzing the requirements of tolerance information in Virtual Environment (VE), it was pointed out that not only basic information but also dynamic behavior information of tolerance were needed. Based on the characteristics of triangle-surface model in VE, a new multi-layer-structure of Product Double Coupled Toleranced Model(PDCTM) oriented to VE was proposed. Combined with product attribute information modeling, the problem of product toleranced modeling in VE was solved. The realization methods of PDCTM, especially the construction of geometrical model, acquisition of attribute information and mapping methods among different layers of the model, were discussed in detail. The application methods of this model were also put forward through discussing the functions of dynamic behavior of tolerance in virtual assembly, visualization technologies of tolerance and precision, as well as the design feedback of tolerance.

Key words: tolerance modeling, virtual environment, product double coupled toleranced model