关键词: 装配体检索, 球谐函数, 相似性计算, 豪斯多夫距离

Abstract: In the process of new product development,it is of great engineering significance to obtain reusable assembly and its related information from existing assembly resource database for improving the efficiency and reduce the cost of development.An assembly similarity analysis method based on spherical harmonic function was proposed,which considered the information of assembly shape and relative position.The spherical harmonic function was used to quantify the parts contained in the assembly as points in the shape description space,and the set of points in the shape space was used as the assembly descriptor.Then,the dissimilarity between the points in the assembly descriptor was calculated by using the modified Hausdorff distance algorithm,and the retrieval steps of similar assembly were given.Five assembly ligands were used as retrieval objects in assembly retrieval case library.Similarity calculation results of different assembly positions,different details and different bandwidth N values were analyzed and discussed to verify the validity of the proposed assembly similarity analysis method.

Key words: assembly retrieval, spherical harmonics function, similarity calculation, Hausdorff distance