Interaction Dynamic Response of a High-Speed Train Moving Over Curved Bridges with Deficient or Surplus Superelevation

Abstract

This paper proposes a three-dimensional dynamic model for high-speed railway trains moving over curved bridges considering the transition curves, circular curves, and superelevation. Key features of this study are to consider the nonlinear geometrical relationships and creep relationships between the wheels and rail, for which the interactive iterative numerical algorithms are developed based on the equations of vertical displacement and rolling of wheelset, and the torsional resonance conditions of the vehicle–bridge system are verified. The results show that the torsional vibration will cause amplification on vertical dynamic response of the beam on the outside edge of the curve. The deficient/surplus superelevation plays an important role in the lateral and torsional angular displacements of the bridge, and the peak of the torsional resonance response can be reduced by adjusting the practical superelevation of the curve. The variations of wheel–load reduction rate and derailment coefficient in the curve section are positively correlated to the deficient/surplus superelevation. The curve radius is the key factor affecting the wear and fatigue of wheel–rail, and when the curve radius is greater than 7000 m, the wear and fatigue can be significantly reduced. Running at a deficient superelevation level can also reduce the wear and fatigue.

System dynamics in structural strength and vibration fatigue life assessment of the swing bar for high‐speed maglev train

“…With the development and maturity of the maglev vehicle/viaduct coupled dynamics, the multibody system (MBS) simulation has been one of the most effective methods to evaluate the vehicle dynamic performances and vibration responses, particularly when focusing on a speed grade higher than the already tested speed grades. Shi et al 1,2 and Zhao and Zhai 3 developed basic MBS models for the dynamic analysis of high‐speed EMS vehicles, the model basically includes the vehicle subsystem, electromagnetic subsystem, and viaduct subsystem. Schmid et al 4 proposed an electromagnet modeling approach to improve mechatronic models and the simulation efficiency of a maglev control system for TR 09 maglev vehicles.…”