Experimental study of the wheel/rail impact caused by wheel flat within 400 km/h using full-scale roller rig  

作　　者：Chongyi Chang Yuanwu Cai Bo Chen Qiuze Li Pengfei Lin 

机构地区：[1]Railway Science and Technology Research and Development Center,China Academy of Railway Sciences Corporation Limited,Beijing,China [2]National Engineering Research Center of Railway Vehicles,CRRC Changchun Railway Vehicles Corporation Limited,Changchun,China

出　　处：《Railway Sciences》2022年第1期76-89,共14页铁道科学（英文）

基　　金：by CHINA RAILWAY Scientific and Technological Research and Development Project(contract no.2015J007-E and 2016J007-H);which the authors hereby express their appreciation.

摘　　要：Purpose–In service,the periodic clashes of wheel flat against the rail result in large wheel/rail impact force and high-frequency vibration,leading to severe damage on the wheelset,rail and track structure.This study aims to analyze characteristics and dynamic impact law of wheel and rail caused by wheel flat of high-speed trains.Design/methodology/approach–A full-scale high-speed wheel/rail interface test rig was used for the test of the dynamic impact of wheel/rail caused by wheel flat of high-speed train.With wheel flats of different lengths,widths and depths manually set around the rolling circle of the wheel tread,and wheel/rail dynamic impact tests to the flats in the speed range of 0–400 km/h on the rig were conducted.Findings–As the speed goes up,the flat induced the maximum of the wheel/rail dynamic impact force increases rapidly before it reaches its limit at the speed of around 35 km/h.It then goes down gradually as the speed continues to grow.The impact of flat wheel on rail leads to 100–500 Hz middle-frequency vibration,and around 2,000 Hz and 6,000 Hz high-frequency vibration.In case of any wheel flat found during operation,the train speed shall be controlled according to the status of the flat and avoid the running speed of 20 km/h–80 km/h as much as possible.Originality/value–The research can provide a new method to obtain the dynamic impact of wheel/rail caused by wheel flat by a full-scale high-speed wheel/rail interface test rig.The relations among the flat size,the running speed and the dynamic impact are hopefully of reference to the building of speed limits for HSR wheel flat of different degrees.

关 键 词：Wheel/rail impact force High-frequency vibration Maintenance rules Speed limit 

分 类 号：U46[机械工程—车辆工程]