Establishment and analysis of time domain model in wheel-rail lateral contact

To study the influence of wheel-rail lateral contact stability on the curve squeal noise,the time domain model of wheel-rail lateral contact system is established based on the wheel's lateral and vertical dynamic analysis.The friction force in the wheel-rail contact surface is calculated by a new improved friction coefficient model.The effects of the wheel's lateral creepage and damping on the stability of contact system are analyzed about the monobloc steel wheel with S-web.It's shown that the curve squeal noise is mainly due to the self-excited vibration of stick-slip motion caused by the difference between the static and the kinetic friction force in the contact surface.If the wheel's modal damping is larger than the critical value of equivalent damping,or the value of lateral creepage is less than 0.0024,the contact system will be stable.The vertical stiffness and the damping of the wheel-rail contact system can make the unstable frequency shift slightly from the wheel's natural frequency.