The Influence of Track Modelling Options on the Simulation of Train-Track Interaction

This paper investigates the effect of different track modelling options on the simulation of train-track interaction for a railway vehicle. A multi-body model of the vehicle is introduced, together with three different track models having increasing complexity. A nonlinear stability analysis of the vehicle is presented, pointing out the influence of track model on the evaluation of the critical speed and on the dominant frequency of the hunting motion. Vehicle response to stochastic excitation from track irregularity is also investigated, analysing the effect of track flexibility models on the vertical and lateral wheel-rail contact force.