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Extended-FEM for the solid-fluid mixture two-scale problems with BCC and FCC microstructures
Sawada, Tomohiro,Nakasumi, Shogo,Tezuka, Akira,Fukushima, Manabu,Yoshizawa, Yu-Ichi Techno-Press 2009 Interaction and multiscale mechanics Vol.2 No.1
An aim of the study is to develop an efficient numerical simulation technique that can handle the two-scale analysis of fluid permeation filters fabricated by the partial sintering technique of small spherical ceramics. A solid-fluid mixture homogenization method is introduced to predict the mechanical characters such as rigidity and permeability of the porous ceramic filters from the micro-scale geometry and configuration of partially-sintered particles. An extended finite element (X-FE) discretization technique based on the enriched interpolations of respective characteristic functions at fluid-solid interfaces is proposed for the non-interface-fitted mesh solution of the micro-scale analysis that needs non-slip condition at the interface between solid and fluid phases of the unit cell. The homogenization and localization performances of the proposed method are shown in a typical two-dimensional benchmark problem whose model has a hole in center. Three-dimensional applications to the body-centered cubic (BCC) and face-centered cubic (FCC) unit cell models are also shown in the paper. The 3D application is prepared toward the computer-aided optimal design of ceramic filters. The accuracy and stability of the X-FEM based method are comparable to those of the standard interface-fitted FEM, and are superior to those of the voxel type FEM that is often used in such complex micro geometry cases.
A sight burden of the LED illumination
Yasuhiro Sawada,Tomohiro Ueda,Yoshinori Horie 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.5
In this paper, it aimed experimentally to consider, and to evaluate it from the influence viewpoint of the illumination under the LED illumination and conventional one. The experimental method provided that conditions, and made them work two lighting environments of the LED lamp and fluorescent lamp. From the experiment result, it provided that the sight burden of LED illumination was smaller than conventional illumination. It is thought that the sight burden was suppressed to the legibility high as for the LED lamp with few flickers of light under the characteristic of light. The LED illumination for domination exist in the viewpoint not only energy efficiency but also the sight burden compared with the lighting.