3D Modeling And Fault Analysis Of Pantograph In Rail Transit

With the rapid development of China’s high-speed railway,the current collection problem of pantograph-catenary system under high speed has become an important factor to limit the reliability,safety and stability of the train.The outage caused by the traction power supply system accounts for a large part of overall faults,and the pantograph-catenary system is an important part of the traction power supply system in electrified railway,the train gets the electric energy through the sliding contact between the carbon slider of pantograph head and the contact line.With the increase of train speed,the matching performance of pantograph-catenary is reduced,the accidents of pantograph breaking and carbon slider wear are easy to happen.Therefore,it is of great value to establish effective models for research and analysis of these two kinds of faults.The main contents of this paper are as follows:First of all,physical mapping of DSA250 pantograph commonly used in high-speed rail is carried out,and components are modeled and assembled under SolidWorks.Due to the complex structure of the 3D entity model,the automatic mesh generation is not applicable,three kinds of mesh processing methods are sought and selected to get a good overall mesh model.Secondly,the structural mechanical characteristics and the failure analysis of the model are carried out based on Comsol finite element software.The motion model of pantograph with hinge joints is set up under the multi-body dynamic physical field,trajectory and stiffness analysis verify the correctness of the pantograph model.Strength analysis shows the stress concentration of pantograph model,and modal analysis defines the stiffness and flexibility of each component.The fatigue physical field is coupled on the basis of multi-body dynamics,the multi-axial high cyclic fatigue results of the pantograph are simulated,and three symmetrical fatigue fracture positions are determined,it is in good agreement with the actual fault locations.Thirdly,two-dimensional pantograph-catenary model is established by setting contact pairs under Comsol.By using effective mesh processing technology,the pressure distribution on the contact surface and the equivalent stress distribution nearby are simulated,the change trend of the contact pressure and wear condition are analyzed.Finally,the contact force experiment is completed on the pantograph-catenary simulator and APP is developed for the previous 3D simulation.A suitable pressure sensor is selected for the laboratory platform,and the wear condition of the carbon slider is observed through experiments,it verifies the correctness of the contactsimulation results.The strength and fatigue simulation APP based on DSA250 pantograph is encapsulated and developed.