Abstract:  In order to improve the evaluation quality and its efficiency of 3D model similarity, a pose normalization method for 3D CAD model based on primitive morphology of mechanical structure was presented. The feature of primitive morphology was analyzed to study geometric information and topological information for primitive morphology. Its calculation model of information quantity was constructed. Then some feature morphologies of mechanical structure were selected by the rank of information quantity. A construction method of pose normalization coordinate system was proposed based on the feature morphology. The effectiveness of the pose normalization method was verified by experiment. The results show that the measurement method of the primitive morphology of mechanical structure can quickly identify the feature structure of the mechanical structure model, and can also provide a theoretical basis for the posture adjustment of the 3D CAD model of the mechanical structure.

Key words:  3D model; similarity evaluation; primitive morphology; information quantity; pose normalization