SENSITIVITY ANALYSIS AND OPTIMIZATION ON PARAMETERS OF HIGH SPEEDPANTOGRAPH-CATENARY SYSTEM

With the improvement in the speed of high-speed trains, thedynamic interaction between pantograph and catenary, a basic mechanicalproblem, has attracted more attention. Good pantograph-catenary relationshipis a basic premise to ensure the security and efficiency of the trainoperation, the stability and reliability of the current collection andreduce the wear of the contact line and pantograph slide. The couplingperformance of the pantograph-catenary system mainly depends on its kineticparameter. In this paper, the stochastic statistical characteristics of thecontact force of the pantograph-catenary system are adopted as theoptimization objective function, and the sensitivity analysis andoptimization design of pantograph dynamic parameters are carried out.Firstly, a dynamic model of 2D stitched catenary and three lumped parameterpantograph is established, and the validation of dynamic analysis of themodel is verified according to British Standard EN50318:2018. Secondly,based on dynamic simulation of the high-speed pantograph-catenary system, adynamic sensitivity analysis on three lumped nine dynamic parameters ofDSA380 high-speed pantograph is carried out, and the sensitivity level ofthe parameters is determined. The sensitivity level of the equivalent massof the pantograph head is the highest, followed by the equivalent damping ofthe lower frame and the equivalent mass of lower frame and the equivalentdamping of the upper frame are the third. Finally, the effect of jointvariation in equivalent stiffness and equivalent damping of the pantographhead on the pantograph-catenary coupling dynamic performance is studied, anda dual-parameter optimization scheme of equivalent stiffness and equivalentdamping of the pantograph head is proposed to improve the current collectionquality pantograph-catenary system. It is suggested to reduce the equivalentdamping of pantograph head and increase the equivalent stiffness ofpantograph head at the same time, and the dual-parameter optimization schemecan achieve a better quality of the pantograph-catenary system than thesingle parameter optimization scheme