Analysis Of The Wheel-rail Force Using The Axlebox Acceleration Of Intercity Trains

With the increase of the running speed, the interaction between wheel and rail is more severe, which affects the stability and safety of the train. Wheel-rail force is one of the important evaluation indexes of vehicle system operation safety, and it is widely used to measure by the instrumented wheelset.But the instrumented wheelset is more expensive and the operating life is short, there is a certainrisk of security. The test of the axlebox acceleration is safe and convenient, and has no effect on the running performance of the vehicle.Therefore, this paper takes the intercity train trailer wheel and axle as the research object, based on the line test and dynamic simulation, to study the relationship between the wheel-rail force and the axlebox acceleration.The following conclusions are obtained:Firstly, the finite element model of intercity train trailer wheel and axle is established, analyzed by statics and finite element simulation.And using dynamic calibration method, calibration tests on the axle, and analysis of the torque and stress distribution in determining the line test measuring point layout schemes.Secondly, data processing is carried out on the measured signal of the circuit.The time characteristics of the test signal are analyzed, and the calibration results are introduced to obtain the dynamic force of wheel-rail.The wheel and axle load spectrum and stress spectrum are further developed and the stress distribution curve of the axle is obtained.Then, from time and frequency, the signal characteristics of vertical force and vertical axlebox acceleration are obtained.The fitting curve of the maximum value of vertical force and the vertical axlebox acceleration is obtained by using the octave band and the coherenceFinally, the vehicle system dynamics model considering elastic wheel is established, and is simulated and analyed with different speed levels through a straight line, curve line working conditions.The data of lateral force and lateral axlebox acceleration is analyzed in two kinds of working conditionsto get the best value of the transmission curve fitting.