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Dynamic Simulation of Product Deformation in Rapid Prototyping
Kishinami, Takeshi,Tanaka, Fumiki,Tadaki, Toshihide 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
One of the most important factors in determining accuracy in stereolithography is the deformation phenomenon caused by the volume shrinkage of resins that accompanies photopolymerization. The objective of the work described in this paper is to perform finite element analysis of this deformation of parts built by stereolithography. We propose an element division method for the analysis of shape and dynamic resin material models based on the properties of resin after photopolymerization. Utilizing these, we will demonstrate simulation parts building, and demonstrate the usefulness of them and influence of their parameters on the deformation of parts.
Contact Constraint Representation in an Assembly Using Configuration Space
Tokunaga, Hitoshi,Tanaka, Fumiki,Kishinami, Takeshi 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
In order to represent an assembly whose components have a degree of freedom (for example, kinematic mechanism), a method for deriving the position and orientation of each component in the assemlbly from the contact constraints of its geometrical elements is required. In this paper, an assembly model which represents an assembly whose components have a degree of freedom is proposed. First, a contact constraint representation between any two specific geometrical elements of two components in configuration space is introduced. Secondly, an expansion of this representation to that of a multiple component assembly is proposed. Thirdly, the representation of the relation of constraints in configuration space is proposed to represent the assembly. Finally, based on these representations, a method for deriving the region for the position and orientation of the components in an assembly is proposed.
Mesh Simplification and Adaptive LOD for Finite Element Mesh Generation
Date, Hiroaki,Kanai, Satoshi,Kishinami, Takeshi,Nishigaki, Ichiro Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1
In this paper, we propose a new triangular finite element mesh generation method based on simplification of high-density mesh and adaptive Level-of-Detail (LOD) methods for efficient CAE. In our method, mesh simplification is used to control the mesh properties required for FE mesh, such as the number of triangular elements, element shape quality and size while keeping the specified approximation tolerance. Adaptive LOD methods based on vertex hierarchy according to curvature and region of interest, and global LOD method preserving density distributions are also proposed in order to construct a mesh more appropriate for CAE purpose. These methods enable efficient generation of FE meshes with properties appropriate for analysis purpose from a high-density mesh. Finally, the effectiveness of our approach is shown through evaluations of the FE meshes for practical use.