Simulation Study On Dynamic Performance Of Transition Curve Parameters Of High-Speed Railway

The running speed of high-speed railway is the symbol of railway modernization.At the high-speed conditions,the dynamic problems between vehicles and the railway line are increasingly significant.and the conditions of the curve line are more complicated.The traditional methods of the parameters research of the railway line design did not consider the complex dynamic interaction between vehicles and the railway line.so it can’t accurately reveal the relation between the parameters of the railway line and the safety and the comfort during the train running.especially for high-speed rail transit. The dynamic simulation analysis based on the dynamic between vehicles and the railway line can accurately reflect the influence of the railway parameters to the operation security,the running stability and the ride comfort,then gets more reasonable parameters of the high-speed railway design.The requirements to the geometrical configuration of the plane curve line in the railway are more strict along with the higher requirements to the running smoothness of the high-speed railway. The transition curve is one element which influences the running smoothness of the high-speed railway from the straight line to the curve line, in its scope,the curvature radius, the rate of change in superelevation of the slope, the centrifugal acceleration and the centrifugal acceleration which is not balanced are constantly gradual changes, so the running range of the transition curve is the weak sections of the running smoothness and the comfort of the passengers in the high driving.The paper based on the parametric study of the transition curve according to the dynamic analysis of the high-speed railway established the reasonable vehicle-line dynamics simulation model of the high-speed railway.By analyzing the data of the simulation calculation, the paper explored the main influencing parameters of the transition curve including the transition curve length, the value of the superelevation, the rate of change in superelevation,the rate of change in inadequate superelevation.And the influencing tendencies and the relative size that the running performances of locomotive vehicles and the responses of the track structure in the curve. And also the paper got the influencing law of the running performances of the vehicles when the vehicles are running in the different track structure form along with the changes of the main influencing parameters of the transition curve. And the paper also explored the influencing law of the vehicle-line system dynamic performance when the vehicles are running in the different track structure form (A frantic jumble rail, Ballastless tracks)along with different speed atc.