关键词: 计算机辅助设计, 模型检索, 相似度, 特征提取, 公共子图

Abstract: To improve the retrieval precision with the feature modeling information in Computer Aided Design (CAD) models,a model retrieval method by taking CAD model feature topology as skeleton,features as unit and geometry of surface feature generation as detail was proposed.The secondary development technology was adopted to extract information,dependence and modeling parameters of each modeling feature,and the feature topological relation set,modeling parameter set and geometric surface set were built.The feature'based geometric surface was classified according to geometric properties,and a feature similarity calculation method was established based on surface similarity calculation.According to the feature topological relation set,the model feature topological skeleton diagram was built.The skeleton diagram was simplified by using geometric transitivity after defining the weights of features,and the similarity between the model and the retrieval one was determined by calculating the maximum common sub-graph.Experimental results showed that this method could effectively achieve the retrieval of similar CAD models with better accuracy.

Key words: computer aided design, model retrieval, similarity, feature extracting, common sub-graph