Research On Dynamic Characteristics Of High-speed Railway Pantograph-catenary System Considering Wheel-rail Excitation

China’s high-speed railway EMUs mainly rely on the sliding contact between the pantograph on the top of the train and the catenary to obtain current from the traction power supply network.The contact performance of the pantograph and catenary is strongly associated with the power supply security of the EMUs,so it is necessary to take a real interest in the contact quality between the pantograph and catenary.Previous research mostly ignored the influence of vehicle vibration on the dynamic characteristics of the pantograph-catenary system.However,when the high-speed train runs on the track with geometric irregularities,it will drive the pantograph vibration,and then affect the contact process of the system.Therefore,in the research on the dynamic characteristics of the pantograph-catenary system,we can’t only pay attention to the pantograph-catenary system itself,but also need to introduce the vehicle-track system to explore the dynamic characteristics of the high-speed railway pantograph-catenary system under wheel-rail excitation.Taking the pantograph-catenary system of the high-speed railway as the research object,considering the wheel-rail excitation of straight track and curved track,this paper analyzes the influence law of rail quality,train speed,curve radius,and curve superelevation on the dynamic characteristics of the pantograph-catenary system,the main research contents are as follows:Firstly,the vehicle-track coupling dynamics model is built based on the vehicle-track coupling dynamics theory,and the pantograph-catenary coupling dynamics model which can introduce the vehicle-vertical vibration excitation is built based on the finite element theory.The availability of the vehicle-track model is confirmed by linear critical speed and nonlinear critical speed,and the accuracy of the pantograph-catenary model is confirmed by the static standard and dynamic standard of EN 50318:2018.Then,based on the basic concepts of track random geometric irregularity and its power spectrum,the spatial samples of track random irregularity are numerically simulated according to the inverse Fourier transform method.By comparing the vertical vibration displacement amplitude of vehicles under the influence of different levels of track irregularity,it is observed that the deterioration of track irregularity will significantly increase the negative impact of vehicle vibration.The vertical vibration displacement of vehicles on high and low mass tracks is input into the pantograph-catenary model as wheel-rail excitation.It is found that the influence of wheel-rail excitation on the dynamic performance of the pantograph-catenary system is not completely negative.Finally,according to the pantograph-catenary dynamic contact quality evaluation index,considering the vehicle vertical vibration caused by wheel-rail excitation,this paper explores the pantograph-catenary performance difference between curved track and straight track from the perspective of rail quality and train running speed,and analyzes the influence of curve radius,curve superelevation and special parameters of curved track on the dynamic characteristics of the pantograph-catenary system.The results show that: The irregularity of rail determines the fluctuation range of the pantograph-catenary contact pressure.With the degradation of rail irregularity,the influence of wheel-rail excitation on the pantograph-catenary contact increases.The current collection quality of the curved track is more easily affected by the rail quality and train speed than that of the straight track.The dynamic performance of the pantograph-catenary system under different curve radius tracks is significantly disparate.The change of curve track superelevation has little effect on the dynamic performance.