Rail vehicle response to lateral carbody excitations imitating crosswind

Abstract

Repeatable field tests to measure the vehicle response to unsteady crosswinds are not practical due to safety and economic reasons. Simulations are therefore necessary to gather information on the vehicle response to crosswind. However, in turn, these simulations need to be validated. This study presents results of measured quasi-static and dynamic responses of a stationary rail vehicle due to defined lateral carbody excitations imitating unsteady crosswind, which are reflected by multibody simulations. The vehicle responses are measured in terms of suspension deflections, lateral carbody accelerations and vertical wheel/rail forces. The vehicle dynamic response to a gust-like event results in an overshoot of wheel unloading. In general the measurements and simulations show good agreement. However, the simulations partly overestimate the responses slightly and an influence due to airspring levelling can be observed in the measured values of quasi-static load cases.

Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains When Entering Tunnel Under Crosswind

“…The framework of wind-vehicle interaction is divided into three main classes, that is, three simple mass models with no representation of vehicle suspension (see European standard [26]), five mass models with suspension stiffness modelled [9,27], and a full MBS based on train-track coupling interaction [28,29]. This study adopts the MBS method, which establishes the dynamic equilibrium equation of train and track subsystem components, where the wheel-rail interaction is Yang et al [12] investigated the temporal evolution of the flow structure and conducted aerodynamic behavior using a numerical simulation method to study the transient characteristics and main factors of the aerodynamic loads that act on trains during tunnel entry with crosswind.…”

“…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. For example, an overturn accident occurred in China's Lanzhou-Xinjiang Railway in 2007, which might be attributed to the transient variation of aerodynamic force when the train was entering wind barriers from open air [10][11][12][13][14].…”

Sudden Variation Effect of Aerodynamic Loads and Safety Analysis of Running Trains when Entering Tunnel under Crosswind

“…The framework of wind-vehicle interaction is divided into three main classes, that is, three simple mass models with no representation of vehicle suspension (see European standard [26]), five mass models with suspension stiffness modelled [9,27] and a full MBS based on train-track coupling interaction [28,29]. This study adopts the MBS method, which establishes the dynamic equilibrium equation of train and track subsystem components, where the wheel-rail interaction is simulated 1…”

“…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 vehicle, and even a serious overturn accident. For example, an overturn accident occurred in China's Lanzhou-Xinjiang Railway in 2007, which might be attributed to the transient variation of aerodynamic force when the train was entering wind barriers from an open air [10][11][12][13][14].…”

An investigation on the active control strategy for a high-speed pantograph using co-simulations

“…The data of pantograph model utilized in this article correspond to the 160ECT pantograph produced by the EC Engineering. The review of the literature 28,29 have proved the appropriateness of including the vibration field caused by the rail vehicle body on the pantograph frame; therefore, the rail vehicle-track irregularities model is included in this study. Adopted in this work, the three-dimensional rail vehicle model includes trolleys with double level suspension, rail vehicle body and rails profile—modeled employing adequate power spectral density (PSD) formula—separately for left and right hand side rail.…”