Model for Vertical Dynamic Analysis of the Vehicle–Track–Subgrade–Ground Coupling System

Abstract

Chapters 6–10 have elaborated several models and their algorithms for vertical dynamic analysis of the vehicle-track coupling system. In the analysis, effects of subgrade and ground have not been considered and the subgrade is simplified into viscoelastic damping elements. In fact, an accurate analysis of the vehicle dynamic action on the track structure has to consider the interactions among the vehicle, the track, the subgrade and the ground. In this chapter, the slab track-embankment-ground system model and the ballast track-embankment-ground system model under the moving load are established, and the flexibility matrices of the moving vehicle at the wheelset and the track structure at the wheel-rail contact point are deduced respectively. By considering the moving axle load and the track irregularity, an analytical algorithm for coupled vibration analysis of the moving vehicle-track-subgrade-ground system is presented. As an application example, the dynamic response analysis of the high-speed train-track-subgrade-ground coupling system is carried out.