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다분야 설계 최적화 기법을 이용한 단거리 탄도 미사일의 초기형상 설계
진재현(Jaehyun Jin),한두희(Duhee Han),진재훈(Jaehoon Jin) 한국항공우주학회 2019 韓國航空宇宙學會誌 Vol.47 No.3
단거리 탄도 미사일의 개념 형상을 설계하기 위하여, 부피, 공력, 추진, 구조, 안정성, 비행 궤적등의 다양한 관점을 고려하는 최적화 문제를 정립하였다. 이를 위하여 기존의 미사일 사례를 분석하여, 설계 조건과 성능지수를 도출하였다. 각 서브 시스템의 모델을 통합하여, 전체 시스템의 성능을 분석하였다. 설계 예시를 통하여, 여러 설계변수가 최종 성능에 미치는 관계성을 분석하였다. In order to design the conceptual configuration of the short-range ballistic missile, the authors have established an optimization problem considering various aspects such as volume, aerodynamics, propulsion, structure, stability, and flight trajectory. For this purpose, the existing missile cases were analyzed and the design conditions and performance indices were derived. The performance of the whole system was analyzed by integrating each subsystem‘s model. Through the design example, we analyzed the relationship between various design variables and final performances.
Design of Gas Flow Channel Routes in a PEM Fuel Cell System Using Topology Optimization
Hong Lie Sun(손홍렬),Cheol Kim(김철),Jae Uk Shin(신재욱) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
연료 전지의 유동채널에 관한 효과적인 위상최적화 방법은 이미 기체유동 채널의 위상최적화 분포를 찾는 분야까지 재발되고 적용되었다. 이 논문은 주로 기본적인 밀도 계산, 기체에 관한 확산방정식 및 incompressible한 Navier-Stakes Equation들로 결합시킨 위상최적화의 수치적 공식을 파생시키고 해결하는 방법을 기술한다. FEM을 이용하여 유체의 공간적 디자인 도메인을 정의하였다. 이 과정에서 도메인과 mesh는 최적화 과정에서 변하지 않았고, 최적화 변수 0은 Stake flow, 1은 Porous flow를 표현한다. 유한요소해석법으로 Navier-Stokes Equation를 이용하여 PDE form의 유체 유동 속도와 압력을 계산하였고 차후 해석하게 될 민감도를 찾기 위해 요소 행렬을 계산하였다. Motivation of this study is to apply the topology optimization technique and to find the route of gas flow channels in the bipolar plate of a fuel cell. The goal of optimization is to maximize the mean reaction rate of gases by finding the optimal porosity distribution. In an example analysis, a solution is pumped through a catalytic bed, where a solute species reacts as it gets in contact with the catalyst. Proton exchange membrane fuel cell (PEMFC) has a lot of virtues such as high-power density, high-energy efficiency, low-temperature operation, fast start-up and zero-emission, so it can be used for a car, an electrical equipment, portable power, and stationary products. The performance degradation of PEMFC is mainly induced by the unreasonable design route of bipolar plates. The optimum shape and route of gas flow channels in bipolar plates can make the reaction rate more uniform.
열유동 및 화학반응을 고려한 PEMFC 연료전지 가스유동채널의 위상최적설계
손홍렬(Hong-Lie Sun),김철(Cheol Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Motivation of this study is to apply the topology optimization technique and to find the route of gas flow channels in the bipolar plate of a fuel cell. The goal of optimization is to maximize the mean reaction rate of gases by finding the optimal porosity distribution. In an example analysis, a solution is pumped through a catalytic bed, where a solute species reacts as it gets in contact with the catalyst. Proton exchange membrane fuel cell (PEMFC) has a lot of virtues such as high-power density, high-energy efficiency, low-temperature operation, fast start-up and zero-emission, so it can be used for a car, an electrical equipment, portable power, and stationary products. The performance degradation of PEMFC is mainly induced by the unreasonable design route of bipolar plates. The optimum shape and route of gas flow channels in bipolar plates can make the reaction rate more uniform.
열, 유동현상을 고려한 폴리머 전해질막 연료전지(PEMFC)의 유로해석
김영성(Young-sung Kim),김철(Cheol Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
A proton exchange membrane fuel cell (PEMFC) stack, which is potently applicable to future cars, consists mainly of a bipolar plate, a membrane electrode assembly, a gas diffusion layer, a collector, and end plates. Optimized fuel cell can result in good electric power and good fuel efficiency. so this research is optimize thickness of end plate, considering both the fastening bolt tensions and thermal expansion of each unit cell (72 cells, 5㎾) caused by electrochemical reaction. As a result of end plate optimization, its overall thickness and weight reduced. and Considering gas flow velocity, pressure, flow rate, shape, and dimension in gas flow channel of Bipolar Plate. As a result of good electric power obtained. This developed research can contribute to the advent of a high performance fuel cell for an automobile.