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권혁빈(Kwon Hyeok-Bin),이관중(Yee Kwan-Jung),이동호(Lee Dong-Ho) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
The tunnel booming noise generated by a train moving into a tunnel has been one of the most serious constraints in the development of the high-speed trains. It is well known that the nose shape of the train has the significant influence on the intensity of the booming noise. In this study, the nose shape has been optimized by using the response surface methodology and the axi-symmetric compressible Euler equations. The parametric studies are also performed with respect to the slenderness ratio, the blockage ratio and the train speed to investigate their sensitivities to the optimization results. The results show that it is possible to define more general design space by introducing the Hicks-Henne shape functions, resulting in the more effective nose shape than that of Maeda. The mechanism and the aspects of the train-tunnel interaction were also investigated from the results of the parametric study.
권혁빈(Kwon Hyeok-bin),유원희(You Won-hee),하강희(Ha Kang-hee),정명수(Jeong Myeong-soo) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Anemometers to examine the characteristics of the natural wind in the vicinity of the railway track has been installed in two spots, one at the Cheon-Asan station of the Seoul-Busan high-speed line, and the other at the Daechon station of the Changhang conventional railway line in 2006 to examine the characteristics of the natural wind around the railway track to estimate the actual wind speed acting on the train and to develop the wind gust model consisting with the Korean climate condition. The measured data shows that the instant wind velocity frequently exceeds the velocity of train speed restriction, 20㎧, and the actual wind velocities measured in the vicinity of the track are larger than the that measured by the Korean Meteorological Administration(KMA) because the anemometers are installed on the highly-elevated bridges.
권혁빈(Hyeok-bin Kwon),김태윤(Tae-yoon Kim),권재현(Jae-hyun Kwon),이동호(Dong-ho Lee),김문상(Moon-sang Kim) 한국철도학회 2002 철도저널 Vol.5 No.4
A numerical simulation has been performed to estimate the transient pressure variation in the tunnel when C7 test train passes through the test tunnel in the Kyoeng-Bu high-speed railway. A modified patched grid scheme is developed to handle the relative motion between a train and a tunnel. Also, a hybrid dimensional approach is proposed to calculate the train-tunnel interaction problem efficiently. An axi-symmetric unsteady Euler solver using the Roe's FDS is used for analyzing a complicated pressure field in tunnel during the test train is passing through the tunnel. Usually, this complex phenomenon depends on the train speed, train length, tunnel length, blockage ratio between train and tunnel cross-sectional area, relative position between train and tunnel, etc. Therefore, numerical simulation should be done carefully in consideration of these factors. Numerical results in this study would be good guidance to make test plans, test equipments selection and to decide their measuring locations. They will also supply important information to the pressurization equipment for high-speed train.
강풍 시 열차전복위험도 평가를 위한 자연풍 측정에 관한 연구
권혁빈(Kwon Hyeok-bin),남성원(Nam Seong-won),유원희(You Won-hee),홍유나(Hong You-na) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The measurement method of natural wind to understand the characteristics of the natural wind along the railway lines in Korea has been investigated to be used in the assessment of the risk of train overturn. The weather information service provided by Korea Meteorological Administration has been employed to outline the broad characteristic of natural wind in Korea. Anemometers using CDMA telecommunication for data transfer have been installed near the railway lines to measure velocities and directions of natural wind and the data processing method has been studied using the measured data.
권혁빈(Hyeok-Bin Kwon),박춘수(Choon-Soo Park) 한국철도학회 2005 한국철도학회논문집 Vol.8 No.1
The mechanism of ballast-flying phenomena by strong wind induced by high-speed trains has extensively been investigated by conducting wind tunnel test and field-measuring of wind velocity in the vicinity of the track. The ballast gathered from the Seoul-Busan high-speed railway track has been classified by mass and shape to find relationship between those properties and the characteristic of movement in high wind and 16-channel Kiel-probe array has been used to examine the detailed flow structure above the surface of the track. The probability of ballast-flying during the passage of the high-speed train has been assessed comparing the results from wind tunnel test and that from field-measuring. The results shows that when the G7 train as well as the KTX train runs at 300km/h, about 25m/s wind gust is induced just above the tie and the probability for small ballast under 50g to fly is about 50% when it is on the tie. If the G7 train runs at 350km/h, the wind gust just above the tie increases to 30m/s, therefore radical countermeasure seems to be needed.
고속열차의 터널통과 시 객차 위치에 따른 승객이명감 비교
권혁빈(Hyeok-Bin Kwon),남성원(S.W. Nam) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
열차가 터널을 통과할 때에 터널 내에서 발생하는 압력파의 크기는 열차의 속도와 터널의 단면적, 그리고 터널 길이의 함수이나 압력파에 의해 객실 내부에서 나타나는 압력 변동은 특정한 열차-터널 주행조건에서도 각 객실마다 차이를 나타낼 수 있다. 본 연구에서는 축대칭 Navier-Stokes 방정식을 이용하여 고속열차가 터널을 통과하는 동안 발생하는 터널 내 비정상 압력 변동을 수치해석하고, 이를 이용하여 각 객실 내 압력변동을 계산하고 객실별로 압력변동의 크기를 비교하였다. 비교 결과, 압력변동의 평가 단위 시간이 길어질수록 객차 별 압력변동의 차이가 커짐을 알 수 있었으며, 터널의 단면적이 작을 경우 이러한 효과도 더 커짐을 알 수 있었다. The intensity of pressure change in tunnel arising when a train passes through a tunnel is known to be proportional to train speed, cross-sectional area of tunnel and length of tunnel, however, the intensity of pressure change in cabin of train can be vary by cabin position in train in a specific running condition. In this study, the pressure change in tunnel induced by high-speed train have been numerically simulated using axi-symmetric Navier-Stokes equation and the pressure changes in each cabin of train have been calculated and compared. Finally, as unit of time for pressure change is longer, the difference of pressure change by cabin position get larger. The effect of cabin position seems to get larger when the tunnel cross-sectional area get smaller.
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.