Research of Part Geometry Model and Gene Coding Based on Semantic Relationship

To describe full part information and promote development of CAD/CAM technique, six feature operator algorithms such as PAD, SHAFT are defined by analyzing static feature structure of parts; by research of dynamic semantic relation between features, two reasonable constraint features “AND constraint feature” and “OR constraint feature” are attained; organic combination of them realizes dynamic semantic connection between static features, and feature-based part semantic relationship geometry model (PSRGM) is built. Based on dynamic generating process of PSRGM and feature coding structure, feature gene coding is completed, and DNA coding of part feature series is realized. Taking the crank for example, application of this method is illustrated.