Analysis Of Seismic Safety And Stationarity Of High Speed Trains

High railway is developing fast in China,at the same time,China is a place that might occur many earthquake events.High railways in China are through several earthquake zones,so that,it is really necessary to study the vehicle-rail(bridge)coupled vibration under the earthquake action.This paper is relying on the National Key Program of China(2017YFC1500801)and National Key Program of China(2017YFC1500806),summarized the theory of the rail-bridge couple dynamic and analysis methods.Based on the structural dynamics,the dynamic equations between the track and the vehicle are established.The calculation program is compiled by MATLAB to analyze the seismic response of high-speed train.Meanwhile,the vehicle model is also carefully established by a multi-body software: SIMPACK.Comparing the calculation results which are established by MATLAB and SIMPACK is to verify the correctness of the MATLAB program.After that,MATLAB program is used to analyze the safety and stability of high-speed train under different earthquake actions,in order to analysis the dynamic response of the high-speed train which was explored around different ground motion intensity,different vehicle speed and peak acceleration.This paper mainly completed the following work: 1)The development of the vehicle-rail(bridge)coupling system is summarized.The development of coupling dynamic between vehicle and rail(bridge)under earthquake action is briefly summarized,as well as the methods that establish the trains and tracks numerical models and the study of the coupling dynamic of vehicle-rail(bridge).2)The establishment of the vehicle dynamics equation,the establishment of the rail model and the coupling function of the rail and wheel are introduced in detail,including mathematical models for creep and normal forces between wheel-rail interaction.The generation method of track irregularity is introduced.The safety indicators and stationarity indicators for evaluating the operation of high-speed trains,such as derailment coefficient,lateral force and load shedding rate,and lateral and longitudinal acceleration of the vehicle body.3)By constructing a 31-degree-of freedom vehicle dynamics equilibrium equation,considering the rail shapes and rail irregularity,compiling the MATLAB program to calculate and evaluate the various indicators of train operation.As well as using SIMPACK to carefully establish the vehicle model,considering the nonlinearity of the suspension system to simulate the calculation of multi-body dynamics.By comparing the calculation results of the two methods,mutual verification of correctness is carried out to lay the foundation for analysis under earthquake action.4)Selecting the typical seismic excitations input into MATLAB program which be verified to explore variation characteristics of train safety indicators und er different period of excellence,ground motion intensity and speed.5)Selecting seismic excitations which have different spectral characteristics input into verified MATLAB program to analyze the spectrum distribution of vehicle vibration acceleration which under different seismic and different ground motion intensity.