2015 年 81 巻 4 号 p. 368-375
For realizing efficient CAE process, dimension-driven deformation of the FEM mesh models is required. In this paper, we propose a dimension-driven deformation of tetrahedral mesh models of mechanical parts. At first, in order to extract dimensions of the mesh models, a new surface segmentation method of tetrahedral mesh models is proposed. In our segmentation method, planar, cylindrical, conical, spherical, and torus surfaces are sequentially extracted by region-growing based on principal directions, normal vectors, and surface fittings. Secondly, a dimension-driven mesh deformation method in which vertices of the mesh models are moved using a space embedding method and the surface information obtained from the segmentation results is proposed. Our mesh deformation method can change parameters of form features of the mesh models such as radius of the fillet, angle of the chamfer, and so on. Finally, Phased Optimal Delaunay Triangulation (ODT) smoothing which improves element shape qualities from the boundary to the inside of the mesh model is extended. The extended Phased ODT smoothing can improve the surface mesh of the conical, spherical, and torus surface using local 2D parameter spaces.