Simulation On The Dynamics Of The Electric High-speed Pantograph-catenary System

After the world's first electrified railway opened in 1964,people vigorously construct the electrified railways in the world.Compared to some developed countries,the construction of electrified railway is relatively late in China.Pass more than 50 years endeavor,the railway has also entered a rapid development period in China.When the train is running,it mainly gets power source form the traction power supply system,that is,through the coupling system of pantograph /catenary.Pantograph-catenary system is the core of power transmission between railway traction power supply system and electric locomotive.The interaction between pantograph and catenary is very important to improve the speed and stability of the locomotive.The contact force between pantograph and catenary should be kept in a proper range.If the contact force is too large,it will cause the contact line uplift amount exceeds the specified value,make part of the section contact line bending or fatigue damage.Finally,the working life of the pantograph and the contact wire is reduced,and the contact wire breakage accident occurs.When the contact force is too small,the contact resistance will become larger,so that much energy consumption and electrothermal loss.When the contact force is less than zero,it will lead to the off-line accident and the electric spark,the pantograph head aloof from the contact line to the arc burning contact surface.Therefore,the simulation on the dynamics of the electric high-speed pantograph-catenary system is of great practical significance.The article firstly has carried out reduction and hypotheses in simple stitched catenary.According to the structural characteristics of the simplified catenary model,the static solution equation of catenary is deduced.The static shape of catenary are set up using pre-sag method and ANSYS software.Calculation and obtain the inherent frequency of the static shape of catenary is based on the modal analysis,which is a foundation to calculate the contact force.We use the two-mass model of pantograph.The nonlinear dynamic differential equations are derived and simplified into linear.The Pantograph-catenary system's dynamic equations are derived from Lagrange's equation,and solved with the method of Newmark by MATLAB software compiling numerical emulation program.The uplift and contact forces at different speeds are calculated.The fluctuating wind speed with Davenport spectrum is generated by the AR model and Wavelet Synthesis.Through simulation,the wind-induced vibration response of the catenary and the contact pressure are investigated.The Contact pressure and uplift in various working condition was analyzed and studied.The factors that have effect on the current-receiving quality between Pantograph and catenary were discussed,whichprovides a foundation for optimization design of system's windbreak structure and identify the major factors that influence the current-receiving quality.