| Limited by the terrain conditions,part of the lines near the High speed railway station are formed by small radius curve,serious wear in which has deeply affected the operation quality and safety of the EMU train.U71 Mn non heat treated rail was used in the outer rail of part of the R400 m curve rail using,but the average rail service life was only 1 year and replaced by the U75 V heat treatment of rail,the rail average life was 2~3 years.Aiming at the problem of serious side wear of rail in small radius curve near highspeed railway station,the simulation analysis method was adopted.Systematically theoretical study was carried out in aspects of small radius curve parameters optimization and wheel/rail profile match.In the premise to ensure the operation safety index of high speed EMU train does not exceed the limit,the measures and suggestions of reducing rail wear were put forward,in order to control the rail wear.The research was carried out from four aspects.First of all,the dynamical model of high speed railway and vehicle was built by SIMPACK,using the wheel/rail interaction in small radius curve as the analyzing object.The dynamical simulation with the R400 m curve of Tianjin station in Beijing-Tianjin Intercity Railway and CRH2 EMU train was analyzed and the measured track irregularity was input.Typical parameters like measured wheel/rail force was compared with the simulation results,in order to verify the validity of the model.Secondly,index for evaluation of rail wear was comprehensively compared.According to the analysis of different simulation results with different wear number definitions in typical case and the impact of characteristics of wheel/rail creep and adhesion on rail wear,the Elkins wear number was finally adopted as the index for wear evaluation.On this basis,the multi-case simulation was carried out to analyze the impact of superelevation,rail cant and friction coefficient in small radius curve on the rail wear.The effect of various factors on the rail wear law was analyzed and the most important parameter for reducing rail wear was put forward.Then the suggestions were given.Focusing on the effects of wheel/rail match on wheel/rail interaction and rail wear,profiles of UIC60,CHN60,60 N and the measured profile were matched with the wheel profile of LMA which was adopted in CRH2 EMU train.The static wheel/rail geometrical contact analysis and dynamic simulation were carried out.The rail wear trend with different wheel/rail match was obtained.Therefore,the theoretical basis for selection of reasonable rail profile and rail profile optimization direction were finally put forward. |
