Influence Study of Linear Eddy Current Braking on Wheel-rail Dynamic Action of High-Speed Train
In order to find out the characteristics of wheel-rail dynamic action of high-speed train under linear eddy current braking,the structure and action principle of eddy current braking device are firstly analyzed.Then,the multi-body dynamic model of high-speed train is established equipped with eddy current brake,where the model fully considers the interactions of the braking device with the vehicle and the rail in different states.The influence of eddy current braking on wheel/rail force,the dynamic displacement between the brake device and rail,the dynamic force is calculated between the brake device and the axle box.The results show that the wheel/rail vertical and lateral force under eddy current braking are increased compared with the release state and the failure state of braking device,the maximum vertical force is about 85 kN,and the wheelset lateral force is about 8 kN.On the calculated conditions,the safety indexes of wheel/rail are within the safety limit.The vibration displacement of the braking device to rail side is within 1 mm,which is far less than the initial 6-9 mm,gap between braking device and rail increases instantaneously during the working process,the increased amplitude is about 2.2 mm.The maximum vertical and lateral force are 46 kN and 13 kN between the brake device and axle box.
High-speed trainlinear eddy current brakeaction stateswheel/rail dynamic actionvibration displacement
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