Influence of high-speed trains passing through tunnel on pantograph-catenary dynamic behaviors

In order to study the influence of pantograph aerodynamic effect on pantograph-catenary dynamic behaviors as a high speed train passing through the tunnel,an aerodynamic model of pantograph / high-spead train as well as a coupling dynamic model of the pantograph-catenary system were built.The simulation of relative motion of train was implemented by use of the sliding mesh technology,and the finite element volume method was used to solve the three-dimensional,compressible,unsteady N-S equation and the turbulence model of k-e two equation.The aerodynamic uplift force of pantograph as the high-speed trains passing through the tunnel with a speed of 350 km/h was obtained.Besides,the response of the pantograph-catenary system considering the aerodynamic uplift force or not were analyzed respectively.The results show that the aerodynamic uplift force of pantograph reaches its peak values at the entrance and exit of the tunnel,and while the high speed train running inside the tunnel is higher than that on the open line.The change of the aerodynamic uplift force of pantograph has a great effect on the contact force and the lifted displacement,which leads the quality of current collection to get worse.