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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.
수소 연료 소모량 최소화를 위한 차량용 연료전지 시스템 운전 조건
윤종선(Jongsun Yoon),민승재(Seungjae Min) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
In a fuel cell electric vehicle(FCEV), a polymer electrolyte membrane fuel cell (PEMFC) stack and balance of plant (BOP) are widely used for its propulsion system. The efficiency of the fuel cell system is dominated by the operating conditions adjusted by BOP. The purpose of this study aims at developing a fuel cell system operating conditions optimization methodology to reduce hydrogen fuel consumption. A fuel cell system model, with electrochemical fuel cell stack modeling, was employed to analyze the system efficiency. The hydrogen consumption is estimated by the vehicle level simulation with fuel cell and battery power split control algorithm. The design variables are oxygen stoichiometric ratio, stack temperature, anode pressure and maximum efficiency power value. The results verify that optimal operating conditions can reduce 12% the hydrogen fuel consumption of FCEV comparing basic operating conditions.
최재훈(Jeahoon Choi),민승재(Seungjae Min),유정훈(Jeonghoon Yoo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.10
Topology optimization method in dynamic problem considering structural damping is proposed for minimizing dynamic mean compliance of design domain. Dynamic displacements are approximated by using mode acceleration method which describes more accurate dynamic responses than mode superposition method. An adjoint variable method is employed to improve the efficiency of calculating sensitivity analysis of an objective function. A simple design problem with variable structural damping is tested to show the feasibility of the proposed method.