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화차대차용 비틀림 흡수구조형 제륜자 홀더행거의 적용을 위한 유한요소해석
전웅식(Jeon Eung-Sik),함영삼(Ham Young-Sam) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Among welded structure bogies in use for high speed freight car, a part of bogies manufactured in 1999 and 2000 have found problems that failure occurs in its end beam. In case of a freight car a difference of weight between empty and loading conditions are worse than in case of a passenger car. Moreover its brake system is tread brake without second suspension system. A failure of end beam is supposed to be due to loading by brake rather than vertical loading by freight. This failure can make brake system useless and may be a cause of derailment in the worst case. In this study, we have proposed a simple torsion-free brake shoe holder hanger to remove torsion of hanger bracket which is supposed to be one of causes of failure and performed finite element analyses for making trial manufactures and its application.
함영삼(Ham Young-Sam),서정원(Seo Jung-Won),이동형(Lee Dong-Hyong),전웅식(Jeon Eung-Sik) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Among welded structure bogies in use for high speed freight car, a part of bogies manufactured in 1999 and 2000 have found problems that failure occurs in its end beam. In case of a freight car a difference of weight between empty and loading conditions are worse than in case of a passenger car. Moreover its brake system is tread brake without second suspension system. A failure of end beam is supposed to be due to loading by brake rather than vertical loading by freight. This failure can make brake system useless and may be a cause of derailment in the worst case. In this study, in order to be proved the cause of failure and to solve the problem it is described that we have measured load history acted on end beam and set up the procedures.
황원주(Hwang Won-Ju),함영삼(Haam Young-Sam),강부병(Kang Bu-Byoung),전웅식(Jeon Eung-Sik) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
The bogie of high speed freight car running on conventional line is welded bogie modeled on Y25 bogie developed in Europe. Y25 bogie has speed limit of 110㎞/h. But it has limiting factors to speed-up as increasing maintenance cost and friction parts pedestal. And also it was reported that cracks are found in the parts where center beam meet bolster and end beam near bracket for braking part. This study includes stress analysis improved structure of welded bogie for strength evaluation by numerical method and experimental method. According to the study, new configuration bogie shows improvement in strength.