Abstract: A part engineering drawing retrieval method based on structure similarity is proposed. The geometric graph of part engineering drawing is labeled as functional surface. The functional surface which is attached topologically is determined according to the fact that whether they are in the common edge, or whether they have concurrent or point in the edge, and further the position relationship between functional surfaces is decided. Finally 2D structure model of part is generated. The constraints of common vertexes and common edges among view structure models are merged to generate 3D structure model of part. By referring to the linear symbolic notation for compounds in chemical database, a structure coding method is presented. The substructure Boolean model of part engineering drawing is used to express retrieval requirement, the substructure retrieval is realized via matching of query substructure code and branch structure code. The part engineering drawing is used to express retrieval requirement, the example retrieval is realized via matching of view structure code, the model retrieval is realized via 3D structure code matching of part engineering drawing and part 3D model. Finally the key algorithm of part engineering drawing structure retrieval is introduced.

Key words: Part engineering drawing, Similar part retrieval, Structure model