The effect of track alignment irregularity on wheel-rail contact geometry relationship in a turnout zone  

作　　者：Li WANG Ping WANG Shunxi QUAN Rong CHEN 

机构地区：[1]MOE Key Laboratory of High-Speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China [2]China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China

出　　处：《Journal of Modern Transportation》2012年第3期148-152,共5页现代交通学报（英文版）

基　　金：supported by the National Natural Science Foundation (No. 51008256);the Technological Research and Development Programsof the Ministry of Railways (No. 2010G006-B)

摘　　要：The irregularity is a key factor affecting the wheel-rail contact geometry relationship. In this paper, we calculated the wheel-rail contact points at typical sections and obtained the longitudinal variation of the wheel-rail geometry relationship with the trace line method. The profile of the key rail sections was matched by cubic spline curve, and the shape interpolation was realized in non-controlling sections. The results show that the roll angles at each typical section increases gradually with the enlargement of track alignment irregularity. When the flange contact occurs, the roll angle increases dramatically. Proper track alignment irregularity towards the switch rail improves the structure irregularity of the turnout.The irregularity is a key factor affecting the wheel-rail contact geometry relationship. In this paper, we calculated the wheel-rail contact points at typical sections and obtained the longitudinal variation of the wheel-rail geometry relationship with the trace line method. The profile of the key rail sections was matched by cubic spline curve, and the shape interpolation was realized in non-controlling sections. The results show that the roll angles at each typical section increases gradually with the enlargement of track alignment irregularity. When the flange contact occurs, the roll angle increases dramatically. Proper track alignment irregularity towards the switch rail improves the structure irregularity of the turnout.

关 键 词：track alignment irregularity wheel-rail geometry relationship TURNOUT roll angle 

分 类 号：U211.5[交通运输工程—道路与铁道工程] TH112.1[机械工程—机械设计及理论]