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철도차량의 에너지 흡수 부재에 관한 실험 및 해석적 연구
이정수(JungSu Lee),김승섭(SeungSub Kim),이장욱(JahngWook Lee),박근수(GeunSu Park),우관제(Kwanje Woo) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The crashworthiness concept is getting important in rolling stock design to minimize injury on passengers and drivers in the event of crash. In this paper, the characteristics of dynamic collapse of energy absorption component that is used on rolling stock are analyzed for studying the importance of crashworthiness. Also, finite element analysis and experimental method are used for analyzing dynamic characteristics of energy absorbing component. First, the result of finite element analysis is compared with the measured absorbing energy of absorbing component through crash test for rolling stock. Through this, the energy absorbing capability of the component was verified.
철도차량의 Crashworthiness 적용에 관한 실험 및 해석적 연구
이정수(Jungsu Lee),박경환(Kyounghuan Park),이장욱(Janguk Lee),박근수(Geunsu Park),우관제(Kwanje Woo) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
The CEM (Crash Energy Managament) concept is getting important in rail vehicle design to minimize injury on passengers and drivers on crash event. In this paper, the accuracy of the FEA analysis result was verified through the crush test on the front part of a non-CEM based carbody. Using the verified FEA analysis method, the energy absorbing capability of the CEM based carbody was estimated.
이정수(Jungsu Lee),조규진(Kyu-Jin Cho),김호영(Ho-Young Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
We report the results of the visualization experiments of vortex structure around a flapping rectangular wing using a high-speed camera and a hydrogen bubble generator. We observe two vortex structures for each half-cycle of flapping, one generated at the acceleration and the other created during a reversal of direction. After the flapping foil reverses its direction, these two vortex structures interact to drift away from the flapping foil minimizing residual flow. This suppresses the Wagner effect (obstructing the development of circulation due to separated wake structure) and promotes the recovery of thrust. We also provide a scaling law to estimate the thrust of a flapping foil based on the observed wake structure.