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민승재(Seungjae Min),방승현(Seunghyun Bang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
New reliability-based topology optimization method is proposed by utilizing single-loop single vector approach, which approximate searching the most probable point in the probabilistic design domain analytically, to reduce the time cost and dealing with several constraints to handle practical design requirements. To examine uncertainties in the topology design of a structure, the modulus of elasticity of the material and applied loadings are considered as probabilistic design variables. The results of design examples show that the proposed method provides efficiency curtailing the time for the optimization process and accuracy satisfying the specified reliability.
이종진(Jongjin Lee),민승재(Seungjae Min),유정훈(Jeonghoon Yoo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.10
The recent issue of storage device is applying to mobile device such as a cellular phone and PDA. It requires actuators to become smaller than conventional type. As the size becomes smaller, the magnetic force is reduced. Therefore, for increasing performance of actuators, magnetic force is maximized and suspension of actuator is optimized. There are two categories to solve these problems. First, maximizing magnetic force through parameter optimization like DOE and RSM. Second, compliant mechanism is proposed to obtain required performance as overcome limited magnetic force considering flexibility as well as stiffness of suspension. In this paper, methods to improve magnetic force and performance of suspension are suggested.
기동 및 정격 시의 전류를 고려한 유도전동기 도체바 형상 최적설계
이겨레(Gyeorye Lee),민승재(Seungjae Min),홍정표(Jung-Pyo Hong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The configuration of rotor slot has a great impact on induction motor characteristics. However the shape of a rotor slot can change the input current and the increase of input current causes the dielectric breakdown of an induction motor. So considering input currents of working conditions is needed in design process. An optimization procedure for rotor slot design of an induction motor to maximize rated torque is proposed using finite element based level set method and the material boundaries of rotor slot are represented by a level set function. Voltage driven analysis based on time harmonic field with external electric circuit is performed, then torque and current at each slip are calculated. To prevent the failure of the induction motor, current constraints are set at rated and starting condition. The proposed method is applied to the reference design problem and validated to improve the design.