Research On Dynamic Behavior Of DSA250 Pantograph-catenary

Excellent contact between pantograph and catenary is an important factor to ensure stable and safe operation of train.With the development of high-speed railway technology,the running speed of train is increasing.Many studies show that when the train is running,the contact force between catenary and pantograph should be stable,and the increase of train speed will lead to the deterioration of pantograph-catenary contact,cause a large fluctuation of contact force,result in many adverse consequences and even accidents.Therefore,to research the contact relationship between pantograph and catenary and improve the contact performance of pantograph and catenary is an important work to improve the train running speed and ensure the safety of train operation.This thesis takes DSA250 pantograph as the research object.Firstly,the three-dimensional model of DSA250 pantograph is established.Then the three-dimensional model is inputed in Recur Dyn multi-body dynamics simulation platform.Two models of rigid body and flexible body are established for the upper arm of pantograph.Two multi-body dynamics model of pantograph are obtained by modeling the pantograph drag spring,the pantograph torsion spring and damping force of pantograph.The finite element flexible body model of catenary is established in ANSYS.The pantograph model and catenary model are coupled in Recur Dyn,and the contact relationship between them is established.Then,the pantograph catenary dynamics simulation of the model is carried out.The pantograph model with rigid upper arm is simulated at 160km/h,180km/h,200km/h,220km/h,250km/h and275km/h speed levels in open and closed operation states;the pantograph model with flexible upper arm is simulated at 250km/h and 275km/h speed levels in open operation states.The rationality and feasibility of the simulation model are verified by comparing the calculation results with the line test results.In order to improve the current collection performance of DSA250 pantograph and obtain more stable pantograph catenary contact force,the pantograph drag spring,the pantogragh torsion spring and damper are optimized at the speed of 250km/h.In addition,in order to reduce the failure rate of torsion spring,a new torsion spring structure and installation scheme are proposed.After the analysis of the influence of the parameters of each component on the pantograph-catenary current collection performance,five optimization schemes are proposed,and then the five optimization schemes are compared to determine the final optimization scheme.