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RISS 인기검색어
- 검색키워드
- 저자 : Heji Zhang (검색결과 2 건)
- 무료
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- 유료
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Monitoring and Cause Analysis of Tread Abnormal Wear in a Metro Line
Heji Zhang,Guiming Mei,Hengyu Wang,Wenjian Wang,Zefeng Wen,Xuesong Jin 한국도시철도학회 2014 IJAR Vol.2 No.2
Abnormal wera of tread is a commonly seen problem in the operation of metro systems. It was found that abnormal wear of tread widely exists on vehicles in a line of Beijing metro. The two main types of abnormal wear are “w” shape wear and narrow grooves on tread. It was found that hardness of the tread is strongly correlated with abnormal wear. Monitoring was conducted to watch the growth of abnormal wear on tread surface. Monitoring results show that abnormal wear of tread disappeared after changing brake shoes. Analysis showed that hardness of brake shoes have a great effect on tread wear. The competition between the wear of wheel tread caused by brake shoes and rail head was discussed to explain the reason of commonly seen abnormal wear of tread in metro systems.
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Monitoring of Corrugation Growth on Tracks with Cologne Egg Fastening System
Hengyu Wang,Stuart Grassie,Yongquan Deng,Heji Zhang,Wenjian Wang,Zefeng Wen,Xuesong Jin 한국도시철도학회 2014 IJAR Vol.2 No.2
Corrugation is a serious problem in railway industry. It may be more commonly seen in metro networks for that metro lines usually have more and sharper curves than the main lines. Research has shown that fastening system is an influence factor on corrugation. Server corrugation was found on tracks with Cologne egg fastening system (Cologne egg for short) shortly after the operation of a metro line. To understand the effects of Cologne eggs on the development of corrugation, curved and tangent lines with Cologne eggs were selected for corrugation growth monitoring. In order to compare the effects of different fastening systems on corrugation, monitoring was also conducted on tracks with the same line condition but using ordinary short sleeper fastening system. Monitoring of rail roughness was done during the whole period between two rail grinding operations using a Corrugation Analysis Trolley (CAT). The characteristics of corrugation growth, such as the speed of growth, the wavelength of corrugation, the distribution of corrugation, etc. were analyzed on different track configurations. Corrugation showed a rapid growth in the first a few weeks after grinding and slowed down after that. Monitoring results show that fasting system is a strong influence factor of corrugation growth. The effect of grinding was discussed. Comparison of corrugation growth of different grinding methods shows that proper grinding method would not only reduce the speed of corrugation growth, but also the final rail roughness level.
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