Studies on critical hunting speed and running safety of conventional railway vehicles moving on curved tracks Online publication date: Thu, 07-Apr-2022
by R.K. Sajeev; Sujatha Chandramohan
International Journal of Heavy Vehicle Systems (IJHVS), Vol. 28, No. 6, 2021
Abstract: Railway vehicle critical hunting speed (CHS) and running safety are factors to be vitally investigated for the study of its dynamic behaviour. In this paper, a numerical investigation of the nonlinear dynamic behaviour of a railway vehicle running on tracks of various radii is carried out using a mathematical model of the vehicle-track combined system. Using single and two point contact scenarios, nonlinear CHS and running safety of the vehicle are evaluated. The model consists of a 25-degrees-of-freedom system with four wheel-sets, two truck frames, two bolsters and a carbody. The track is idealised as a laterally flexible spring-mass-damper system. The model is solved for the dynamic response in the time domain using Runge-Kutta fourth-order method. Limit-cycle-type oscillation is adopted to evaluate the nonlinear CHS. Furthermore, the influence of material and wheel/rail geometric parameters on vehicle running safety are presented, which is based on derailment quotient and offload factor.
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