DYNAMIC COUPLING MODEL OF BALLASTLESS TRACK-VEHICLE CONSIDERING THE BASE STRUCTURAL DAMAGE AND ITS SOLUTION

To explore the interaction mechanism between the damage to the ballastless track structure and the dynamic interaction of the vehicle and track, a dynamic coupling model of ballastless track-vehicle involving structural damage was established based on the classical theory of vehicle-track coupling dynamics. The damage effect of the ballastless track structure was considered by using the elastic damage constitutive model of concrete. The vehicle was simplified as a multi-body system. The random track irregularity was assumed to recur in a period of the length of a single car. Hertz nonlinear contact was used to transfer the vertical coupling force between the vehicle system and the damaged ballastless track system. To accelerate the solving convergence rate of the dynamic model including material nonlinearity and contact nonlinearity, the implicit dynamic prediction-correction algorithm and the cross iteration of the track-vehicle system were used. The solving method realized a fast and implicit solution of the dynamic vertical coupling model of vehicle and damaged ballastless track.