关键词: 薄壁件模型, 中面生成, 弦轴转换, 四面体网格分类, 模型简化

Abstract: To solve the problem of poor robustness,incomplete classification and poor applicability in traditional Chordal Axis Transformation (CAT),an improved CAT based mid-surface generation approach for thin-walled model was proposed.All the face type (lateral face,face pair and mixed face) in the model was identified,and a combination method of face-pair based and CAT based was used to virtual decompose the model according to the connection faces.The single layer tetrahedral mesh was generated by the improved mesh generation method efficiently.A complete tetrahedron mesh classification was provided to assist CAT operation and the resultant mid-surface mesh could be obtained after mesh refinement.Some typical models were given to illustrate the robustness and effectiveness of the proposed approach.

Key words: thin-walled model, mid-surface generation, chordal axis transformation, tetrahedral mesh classification, model simplification