Simulation And Application Research Of Air Deflector’s Aerodynamic Compensation On High-Speed Pantograph

China’s high speed rail is currently thriving, and the train’s speed is constantly raised. High-speed EMU has benefitted people’s touring to a great extent and boosted Chinese economy immensely. However, a variety of speed-related problems has ensued with the rise in train’s speed. The aerodynamic force acting upon the pantograph has surely become one of the inneglectable elements that affects its power-gathering quality. The issue as to how to ensure a stable and healthy power-gathering quality from the overhead wire while maintaining a high speed has become a core one in aerodynamics and aerodynamic control.This dissertation first conducted an aerodynamic analysis according to aerodynamic theory, proposed a new symmetrical airfoil based on the normal, typical model and then introduced duct to pair with the new airfoil. Then ran numerical simulation on the ducted airfoil model using CFD software pack, and acquired the numerical relationship between the lift and the vertical movement of the airfoil in relation to the duct which can further be used as a theoretical numerical equation in the following co-simulation in which aerodynamic compensation force is added as an active control force.To dynamically couple pantograph and catenary and acquire the dynamic contact force between the two via simulation, a simplified model of catenary and pantograph is first needed:the catenary’s variance in stiffness is converted to a time-varying stiffness formula which is then exported into MATLAB/Simulink; via the interface of Solidworks and SIMPACK, the Solidworks 3-D pantograph model is exported to the SIMPACK where a 3-D model is built. There the model’s relevant parameters is subsequently defined, including the weight of each part, joints and constraints, the frictional damping of each revolute pair and drive torque, etc. Then SIMAT co-simulation is run via the interface of SIMPACK and MATLAB/Simulink. The addition of pangtograph-catenary contact force and aerodynamic force and necessary control scheme is done in MATLAB/Simulink. Then the characteristics of pangtograph-catenary system without adding aerodynamic compensation force is analyzed, contact force under case scenarios of different stiffnesses of the panhead spring is acquired and through referring to indexes of pantograph-catenary contact quality, the best panhead spring stiffness is analyzed and finally determined.At last, the characteristics of pangtograph-catenary system with aerodynamic compensation force is analyzed via co-simulation of the system in two case scenarios:the duct being fixed onto the balance arm and that being fixed onto the carbody. And based on the formula of airfoil lift against its vertical displacement acquired in chapter 3 and relevant aerodynamic knowledge, the system’s contact force in each case scenario is obtained. Finally, the dissertation compares the system’s contact force with and without compensation force and put forward thoughts to refine and better the active control scheme.