Study On Different Line Types Of The Train Wind Load And Train Operation Safety

With the rapid development of high-speed railway,the railway has become one of the major means of travel.High speed trains because of its high speed,crosswind will affect its safety.In this paper,five kinds of train operation environment(flat,high embankment and deep cutting,bridge and long-span bridges)were considered to study the wind loading on the train,and to analyze the impact of wind load under various environments of the train stability.The innovation of this paper is that it is different from the traditional research methods,and a three-dimensional model is established to study and analyze the high-speed train(the head car,the middle car and the tail car).This is different from the traditional two-dimensional model,and the train model is unified using the same model.First of all,In order to achieve the load difference between the head car,the intermediate vehicle and the tail car,and control the number of grids and improve the efficiency of calculation,the 3 dimensional CRH3 numerical model is selected.Considering the shape factor of the head and tail of the train,the results can be more accurate.The region independence and the grid independence are verified to ensure the reliability of the numerical model.Secondly,on the train in five environments(flat,high embankment and deep cutting,bridge and long-span bridges.)under the operating conditions,the 5 kinds of different wind speed(15m/s,20m/s,25m/s,30m/s,40m/s)level of the numerical analysis.The variation of wind load on the train under different line types and the change of wind load velocity under the same environment are determined.Finally,combining with the wind load calculation the various operating environment and wind speed,the wind vehicle bridge(line)analysis software BANSYS(Bridge Analysis SYStem)coupled vibration analysis of train running stability calculation.The train with 8 trains:2 x(Motor car + trailer + trailer + Motor car),each car static wind through the static three component coefficients of the input BANSYS software,in the calculation of the static wind head and tail car is different from the middle car.The influence of the line type and other factors on the lateral acceleration,vertical acceleration,wheel lateral force,rate of wheel load reduction and derailment coefficient based on the discussion,to accurately assess the safety and stability of the train,aiming at all kinds of traffic environment are closed and wind speed standard speed limit standard.The results show that:under different operation conditions,each section of vehicle body of the train in crosswind by drag and lift are not the same,and the change of wind speed trend differences.At the same time,in order to ensure the stability and safety of the train,the speed limit should be satisfied in different conditions of the line and wind speed.