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Min, Seungjae,Nishiwaki, Shinji,Kikuchi, Noboru 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.9
The flexibility as well as the stiffness is required to perform mechanical function of a structure such as compliant mechanisms, which can be applied to MEMS(Micro-Electro-Mechanical Systems), flexible manufacturing devices, and design for no assembly. In this paper, the optimal design problem to achieve both structural flexibility and stiffness is formulated using multi-objective function, and the optimization problem is resolved by using Finite Element Method(FEM) and Sequential Linear Programming(SLP). Design examples of compliant mechanisms are presented to validate the design method.
Optimization of Magnetization Directions in a 3-D Magnetic Structure
Choi, Jae Seok,Yoo, Jeonghoon,Nishiwaki, Shinji,Izui, Kazuhiro IEEE 2010 IEEE transactions on magnetics Vol.46 No.6
<P> This study introduces a design method for determining the optimized magnetization directions in 3-D magnetic systems. Based on a modified topology optimization method, discrete magnetizations are investigated in six directions <TEX>$(\pm{x},\pm{y},\pm{z})$</TEX>. The finite-element method is used for the 3-D magnetostatic field analysis. The proposed method is applied to the design of a magnet pattern having “one-sided flux” and the design results show that the optimized magnet pattern appears as one or two Halbach arrays according to the shape of the design domain. The optimization process is accomplished by using sequential linear programming and the adjoint variable method. </P>
Choi, Jae-Seok,Yoo, Jeong-Hoon,Nishiwaki, Shinji,Terada, Kenjiro 대한기계학회 2007 大韓機械學會論文集A Vol.31 No.3
Many engineering problems require the calculation of effective material properties of a structure which is composed of repeated micro-structures. The homogenization method has been used to calculate the effective (homogenized) properties of composites and several homogenization procedures for different physical fields have been introduced. This research describes the modified homogenization technique for magnetostatic problems. Assuming that the material is periodically repeated, its effective permeability can be prescribed by calculating the homogenized magnetic reluctivity using the finite element analysis of the micro unit cell. Validity of the suggested method is confirmed by comparing the results by the energy based method as well as the widely known homogenization method.
재료분포의 연속적인 근사를 이용한 위상최적설계 방법의 비교연구
임영석(YoungSeok Lim),민승재(Seungjae Min),유정훈(Jeonghoon Yoo),寺田賢二郞(Kenjiro Terada),西脇眞二(Shinji nishiwaki) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, continuous approximation of material distribution (CAMD) which is an effective to prevent numerical instabilities occurring is applied to topology optimization using simple isotropic material with penalization . The optimization problem is formulated to minimize the compliance such as general stiffness design problem. we confirm an effect of CAMD in SIMP and compare results of CAMD in HDM with that of CAMD in SIMP through two representative numerical examples.