Dynamic response of railway vehicle with aerodynamic admittance function: An optimized algorithm

Abstract

Wind effect for railway vehicle was a common problem, and attracted an increasing concentrate, due to the rapidly development of the high-speed railways. In order to evaluate the effect of aerodynamic admittance of a train on the safety, the buffeting force expression (BFE) of vehicle needed to be optimized. In this paper, an advanced approach for the optimization of the BFE of vehicle was proposed. According this methodology, the BFE modified by the aerodynamic admittance function (AAF) took the effect of the vertical fluctuating wind speed into consideration. For the AAFs of railway vehicle obtained by wind tunnel test, a numerical model for the vehicle system, which was fitted based on the expression of frequency responses function of mass-spring-damping system, was presented and verified by the experimental data. The effects of the fitting parameters for the numerical model on the weighting function (WF) and time history of the buffeting force of vehicle were investigated. Then, the WFs of the buffeting force for the vehicle running on the different infrastructure (including flat ground, embankment and bridge) with various wind direction angles, were carried out. Finally, the influences of different flow fields on the dynamic responses of railway vehicle moving on three types of infrastructure were calculated.