Study On The Vibration Sensitive Point Of High-speed Rail Line By Dynamics Analysis

For the past few years,China's high-speed railway has made great achievements.On September 21,2017,the Renaissance EMU has been to be the first to operate at 350km/h on the Beijing-Shanghai high-speed railway and China has become the world's fastest railway operator once again.With the continuous improvement of high-speed train operation speed,the vibration intensity between the rolling stock and the track is also increasing.Especially the part that the curve connected with the straight line,the dynamic effects between the wheels and the tracks are more obvious owning to the constant change of the curvature and the super-elevation of the line.On the area of rail-line where plane curves continuous,the transition curve or intermediate straight line is set to avoid the stacking of the vibrations of the wheels and tracks and ensure running safety and stability of the vehicles.But little attention has been given to the vibration superposed problem between the plane curve and the adjacent vertical curve.Thus,it is necessary to analysis the vibration superposed problem between the plane curves with its adjacent vertical curves and work out the recommended value of the intermediate straight line between the plane curves with its adjacent vertical curves and the length of grade section between the adjacent vertical curves on the basis of existing research and the multi-body system dynamics principle.In this paper,the literature research method and modeling method was combined to study the problem.By studying the existing literature and related materials,the influence of the curve parameters on the dynamic performance was comprehensively analyzed and the parameters and its value range considered in the simulation experiment were determined.Meanwhile,basing on multi-body system dynamic theory,the simulation model of EMU CRH2-300 was modeled with the dynamic simulation software SIMPACK and then it was used to analyze and verify the related conclusions.By analyzing the results of simulation experiments,the conclusions about the dynamic response of the high-speed rail-line parameters on the vehicle from existing literatures and related materials were verified.Then performed a statistical analysis on the vibration damping time of the wheel-rail system and calculated the vibration damping distance of the vibration produced at the vibration sensitive point,and given the recommended value of the intermediate straight line between the plane curves with its adjacent vertical curves and the length of grade section between the adjacent vertical curves to provide references for perfecting our high-speed railway design theory.