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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.
Robotics-Mechatronics Design Competition in Kyushu Area, Japan
Taisuke Sakaki,Takanori Kiyota,Hitoshi Kino,Shinichi Sagara,Ryuichi Oguro,Shunji Moromugi,Keiji Imado,Hidetaka Ikeuchi,Manabu Fukushima,Takeshi Ikeda,Kanta Aoki,Nobuhiro Ushimi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We describe a unique competition based on the novel concept of robotics and mechatronics products that included evaluation of the products’engineering function and interface design. Seventy-seven students of eleven teams from seven universities in the Kyushu area participated in the competition, whose subject was “Health care, life supporting and communication or other technical aids for the elderly or disabled.”Many of the plans presented ideas that balanced function and design, showing the results of collaboration among students studying engineering and students studying product design.