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지용현(Yong-Hyeon Ji),장훈기(Hun-Gi Chang),이동훈(Dong-Hun Lee),김재철(Jae-Cheol Kim) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The comforts of railroad vehicle is improved as the manufacturing technique advances. The subway is citizens' important transportation mean, operation length of which is 728.2㎞, and it has become an essential transportation mean which satisfies convenience, regular operation, environmental-friendliness, and safety. The comfort and audibility of train information announcement to the passengers is a large part of riding environment. However, procuring proper loudness of information announcement in accordance with the incessant, unpredictable changes of operation condition such as passenger number, speed and condition of rail and wheels is still a difficult problem to solve. In this study, frequency and time analysis of several types of measured noise, that occurs during train operation, in comparison with train announcement sound sources is made, and implementation of realtime loudness controller by experimental method including implementing system models and analysis algorithms is performed.
도시철도차량 차륜마모 특성 및 유지보수기준에 관한 연구
박수중(Park Soo-Choong),지용현(Ji yong-hyeon),김은실(Kim eun sil) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Many kinds of rolling-stocks that have various control methods are being operated by Seoulmetro which is a history of a city railroad rolling-stock. Seoulmetro is being faced with a wheel management comparing of other lines with a perpendicular wear of wheel and a side damage, and so on, by operating several cars at a loop line. This is causing maintenance expenses increase and deteriorating a fusibility of rolling-stock, for it has an effect on a rolling-stock using. A cutting pattern of wheel and a wear form affect the expected span of a wheel. A wheel cutting cause is classifed into cutting for reprofiling of a flange wear of wheel and for removing every kind defect which originates from wheel wear. In this study, Seoulmetro exhibit a stable rolling-stock use method and a reasonable management method of wheel, analysing wheel exchange condition and cutting management of wheel.