A Study of Wheel Set Longitudinal Vibration Resonance Mechanism

Wheel set longitudinal vibration was a normal phenomenon in railway vehicle dynamic analysis. The coupling of the two wheels in the same wheel set by the axle rigidly or elastic was the precondition of the existing of wheel set longitudinal vibration resonance. The wheel set longitudinal vibration model which has 7 degree of freedom and in which the axle torsion vibration was considered has set up to research the wheel set longitudinal vibration resonance mechanism. The wheel/rail normal contact was simulated by the one sided spring damper force element, and the wheel set longitudinal vibration resonance mechanism was researched by the combine of theory analysis and numerical simulation methods. Put forward the happening mechanism of the wheel set longitudinal vibration has something related with running speed and given a simple forecast formula of wheel set longitudinal vibration resonance speed.