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권혁빈(Hyeok Bin Kwon),유원희(Won Hee You) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.6
측풍 시 AREX 열차에 가해지는 공기역학적 하중을 측정하기 위하여 풍동시험이 수행되었다. 5% 축소 시험 모델은 연결부, 하부 및 대차부 등을 포함하여 가능한한 자세하게 모델링되었다. 시험에 사용된 풍동은 폭 4m × 높이 3m의 시험부를 가진 한국항공우주연구원(KARI)의 중형 아음속 풍동이다 두 종류의 선로 모형에 놓여진 열차 모델에 가해지는 공기역학적 하중과 모멘트는 요각에 따라 도시되었으며, 실험 조건에 따른 공력 계수의 특성이 분석되었다. This study is devoted to measure the aerodynamic forces acting on AREX train in crosswind using wind tunnel testing. 5 % scaled test model has been modeled as detailed as possible including the inter-car, under-body, and the bogie systems. The aerodynamic forces on each vehicle of the train have been measured in the 4m×3m test section of the subsonic wind tunnel located in Korea Aerospace Research Institute(KARI). The aerodynamic forces and moments of the train model on two different track model have been plotted with regard to various yaw angles and the characteristics of the aerodynamic coefficients have been analyzed relating to the experimental conditions.
권혁빈(Hyeok Bin Kwon),유원희(Won Hee You),조태환(Tae Hwan Cho) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.1
측풍 시 AREX 열차에 가해지는 공기역학적 하중을 측정하기 위하여 풍동시험이 수행되었다. 5%축소 시험 모델은 연결부, 하부 및 대차부 등을 포함하여 가능한한 자세하게 모델링되었다. 시험에 사용된 풍동은 폭 4m × 높이 3m 의 시험부를 가진 한국항공우주연구원(KARI)의 중형 아음속 풍동이다. 두 종류의 선로 모형에 놓여진 열차 모델에 가해지는 공기역학적 하중과 모멘트는 요각에 따라 도시되었으며, 실험 조건에 따른 공력 계수의 특성이 분석되었다. In this study, we measure the aerodynamic forces acting on an AREX train in a crosswind by wind tunnel testing. A detailed test model scaled to 5% of the original and including the inter-car, under-body, and the bogie systems was developed. The aerodynamic forces on the train vehicles have been measured in a 4 m × 3 m test section of the subsonic wind tunnel located in Korea Aerospace Research Institute (KARI). The aerodynamic forces and moments of the train model on two different track models have been plotted for various yaw angles, and the characteristics of the aerodynamic coefficients have been analyzed at the experimental conditions.
주행속도 시속 500km 달성을 위한 고속철도 차량의 공기저항 저감 목표 및 달성 방안
권혁빈(Hyeok-Bin Kwon),윤수환(Su-Hwan Yun),이형우(Hyung-Woo Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The maximum speed of high-speed rail is restricted to various factors such as track condition including slope and radius tunnel and dynamic stability of vehicle. Among the various factors traction effort and resistance to motion is principal and basic factor. In addition at high speed over 300km/h aerodynamic drag amounts up to 80% of resistance to motion that it can be said that aerodynamic drag is the most important factor to decide the maximum speed of high-speed rail system. This paper deals with a measure to increase the maximum speed of high-speed train by reducing aerodynamic drag. The traction effort curve and resistance to motion curve of existing high-speed train under development has been employed to set up the target of aerodynamic drag reduction to reach up to 500km/h without modification traction system. In addition the contribution of various sources of aerodynamic drag to total value has been analyzed and the strategy for implementation of aerodynamic drag reduction has been discussed based on the aerodynamic simulation results around the train using computational fluid dynamics.