Abstract
Sudden variation of aerodynamic loads is a potential source of safety accidents of high-speed trains (HSTs). As a follow-up investigation on the aerodynamic response of a HST that enters a tunnel under crosswind environment, this paper focuses on the transient response of a HST’s safety indices based on the train–track coupling interaction model. Firstly, a wind–train–track coupling dynamic model is proposed by introducing transient aerodynamic loads into the vehicle–track system. Secondly, the temporal evolution of safety coefficients indicates that the train’s safety risk increases during tunnel entry with crosswind. Results show that the derailment coefficients and wheel load reduction rate during tunnel entry are not only larger than those in open air, but also those inside the tunnel are due to the sudden disappearance of wind excitation at the tunnel entrance. In addition, the characteristic wind curve, which is the wind velocity against the train speed, is presented for application based on the current specification of the safety criteria threshold. The investigation will be useful in assessing the safety risk of a running train subjected to other aerodynamic attacks, such as the coupling effect of an infrastructure scenario and crosswind in a windy area.
Highlights
The flow field around a vehicle usually varies transiently when vehicles move from one infrastructure scenario to another, depending on the infrastructure scenarios, such as flat grounds [1,2,3,4], embankments [1,5,6], and viaducts [7,8,9], thereby resulting in the transient variation of aerodynamic force on a vehicle and even a serious overturn accident
The results showed that the transient variation of aerodynamic forces on trains was significant and varied differently for the leading, middle, and tail carriages
When the time was less than approximately 0.5 s, the entire carriage ran in the open air, the train withstood the side force from the crosswind, and the rail in the leeward side was pressed by the edge of the wheel
Summary
The flow field around a vehicle usually varies transiently when vehicles move from one infrastructure scenario to another, depending on the infrastructure scenarios, such as flat grounds [1,2,3,4], embankments [1,5,6], and viaducts [7,8,9], thereby resulting in the transient variation of aerodynamic force on a vehicle and even a serious overturn accident. With independent degrees of freedom aerodynamic response and the corresponding traffic safety of a running HST during tunnel entry (DOFs) of the vehicle is adopted discuss thesystem wheel–track response induced by the sudden with crosswind. This study adopts the MBS method, which establishes the dynamic equilibrium simple mass models with no representation of vehicle suspension (see European standard [26]), five equation of train and track subsystem components, where the wheel–rail interaction is simulated mass models with suspension stiffness modelled [9,27], and a full MBS based on train–track coupling interaction [28,29]. Loads are subsequently inputted into a sort of vehicle–track system model
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