Impact of aerodynamics of pantograph of a high-speed train on pantograph-catenary current collection

For the analysis of high-speed train pantograph-catenary current collection quality considering the impact of pantograph average steady-state and unsteady aerodynamic forces,based on the pantograph model with unsteady aerodynamics and the assumption of uniform flow,the unsteady drag and lift forces of pantograph components were obtained by computational fluid dynamics(CFD) method.By loading the pantograph unsteady aerodynamic forces with the pulsation and the mean steady aerodynamic forces,which were the time average of the unsteady aerodynamic forces,to the dynamic model of pantograph-catenary system respectively,the dynamic features of pantograph-catenary system under two kinds of aerodynamic forces were compared.The simulation shows that under the pantograph three mass model,the dynamic responses enduring uniform current with either pantograph steady or unsteady flow dynamic assumption exhibit little divergence.Moreover,the effects of the amplitude and frequency of the pantograph unsteady aerodynamic force incentives were also examined.The resuts indicate that when the amplitude of the incentive is large or the frequency approaches to the natural frequency of the system,the current collection characteristics would be influenced significantly.This study will provide a basic foundation for the further investigations on the current collection quality of pantograph-catenary system under different complicated aerodynamic conditions such as under non-uniform flows,or cross winds.