关键词: 扩展特征树, 三维实体模型, 相似评价, 树匹配, 设计资源重用

Abstract: Aiming at the problem that the existing 3D Computer Aided Design(CAD)model retrieval algorithm was difficult to capture engineering semantics in components and satisfy the needs of design reuse,a novel approach of 3D CAD model similarity assessment based on extended feature tree was proposed.Through defining the design features interactively and establishing the relationships between these features automatically,the boundary representation of 3D CAD model was taken as the input to build the extended feature tree.The 3D CAD model was given by extending feature trees and geometric attributes of design features comprehensively,and the similarity evaluation between 3D CAD models was realized through an approximate tree matching algorithm and an adaptive weighting scheme.Theoretical analysis and experimental results showed that the method could quickly retrieve similar 3D CAD models,and the retrieval results could reflect the design semantics of the model and meet the needs of design reuse.

Key words: extended feature tree, 3D solid model, similarity assessment, tree matching, design resource reuse