Application Research On The Stability Of High-speed Vehicle Based Wheel-rail Interface

Running stability of high-speed vehicle is the most important dynamic indexes, and basic requirements for safe operation of vehicles. The wheel-rail interface will have serious impact on the stability of high-speed vehicle. According to the real situations of WuHan-GuangZhou high-speed railway, mainly researching on the stability of CRH2-300, CRH3 EMU, from the wheel-rail wear, wheel reprofiling, rail grinding and wheel-rail contact geometry, etc. The main research work involves:(1) Introducing the basic stability features of high-speed train; describing the stability of methods for linear and non-linear stability methods, and analyzing two non-linear methods of calculating the non-linear critical speed in depth.(2) Introducing the bogie’s character, and validating simulation model of CRH2-300 and CRH3 EMU.(3) Comprehensive comparison of design profile, wear profile, reprofiling of wheel, and design profile, grinding profile of rail, and studying on characteristics of equivalent conicity, rolling radius difference, contact angel difference, contact point distribution.(4) The simulation model of single wheelset was established. Study on the non-linear stability of single wheelset in different wheel-rail contact, and the relationship between wheel/rail contact geometry.(5) Research on the non-linear lateral stability of CRH3 from wheel/rail profiles, wheel/rail contact geometry, wheel/rail friction on straight line and curve railway respectively;(6) Calculation the critical speed of CRH2-300 and CRH3 respectively, using the methods of single excitation and stochastic excitation. Drawing the following conclusions: a decreasing equivalent conicity function in the range of amplitudes below 3 mm leads to supercritical Hopf bifurcation with small limit cycles and consequently to largest differences between the two methods compared. The conclusion was validated by the Benchmark model, S1002 wheel profile, UIC 60 rail profile. Finally, describing the nonlinear critical speed and characteristic of CRH3 in wear wheel profile.