Influence of Typical Operational Wind Environments on Dynamic Performance of 400 km/h EMUs
This study aims to analyze the influence of aerodynamic loads on the dynamic performance of high-speed trains at the speed of 400 km/h under three typical operational conditions:a 15 m/s crosswind on open lines,a train passing through a double-track tunnel,and trains passing on open lines.Firstly,the unsteady aerodynamic force and torque of each car under the three typical environments are obtained by using the Fluent fluid dynamics software and then applied as an external excitation to the Simpack multi-body dynamics simulation model.The offline fluid structure coupling model of the train is established,and the dynamic performance simulation analysis of the high-speed train at increased speed is carried out.The results suggest that compared with conditions without aerodynamic load,aerodynamic loads can increase the stability and safety index of trains in different environments,though it various between different car bodies;under the crosswind condition,due to the significant lateral force and yaw moment on the head car,the deterioration of the stability and safety of the head car under the influence of aerodynamic loads is much greater than that of other cars;under the condition of a train passing through a double-track tunnel,due to the influence of wake vortices,the fluctuation of aerodynamic lateral force and yaw moment of car no.1 to no.8 gradually increases.Consequently,under the influence of aerodynamic loads,the deterioration of the lateral stability of car no.4 to no.8 is far more severe than that of car no.1 to no.3;under the condition of trains passing on open lines,the stability index of each car increases with close amplitude,but the safety of the tail car significantly deteriorates compared with other cars.
NETL
NSTL
万方数据
