The Establishment Of Rigid Catenary Model And Research On Dynamic Characteristics Of Pantograph-catenary System

In recent years,the construction of urban rail transit in China has maintained a momentum of rapid development.According to statistics of the Urban Rail Transit Association,the new rail transit mileage exceeds 3,000 kilometers during the "Thirteenth Five-Year Plan" period,the total operating mileage has exceeded 4,900 kilometers and is expected to exceed 8,300 kilometers by 2022.Subway is an important component of urban rail transit,the safety and reliability of its operation have become the focus of increasing attention.The good f currentcollecting quality of pantograph-catenary system is a necessary condition for the safe and stable operation of the train,the dynamic contact pressure is one of the important indexes to evaluate the current-collecting quality of the pantograph-catenary system.However,domestic subway lines are generally designed according to specifications and expert experience,and the phenomenon that the pantograph-catenary parameters do not fit may occur in actual operation.Therefore,it is possible to provide reference for the design of subway lines by using simulation methods to study the factors affecting the contact pressure of the pantograph-catenary system.At the same time,artificially injecting faults in the simulation to obtain the fault response of the pantograph-catenary system is of great significance for the realization of pantographcatenary system fault prediction and improvement of the state repair system.Firstly,according to the actual conditions of the Guangzhou Subway Line 3,the ternary mass model of the TSG18 F pantograph and the finite element model of the rigid catenary based on solid element are established.The rigid catenary and pantograph model is coupled through the spring element and the node coupling method is used to simulate the sliding of the pantograph along the contact line.Then,the static and modal characteristics of the finite element model of the rigid catenary based on solid element are studied,the natural frequencies and mode shapes are obtained and compared with the static and modal characteristics of the finite element model of the rigid catenary based on beam element,the validity of the finite element model of rigid catenary based on solid element is verified from the perspective of the inherent characteristics of the structure.Finally,the transient dynamics method is used to research the dynamic characteristics of the pantograph-catenary system,the effectiveness of the pantograph-catenary coupling model is verified from the perspective of dynamic characteristics by comparing with the measured data of the contact pressure of Guangzhou Subway Line 3.At the same time,the influence of different parameters on the contact pressure is studied.On this basis,the influence of different failure degrees of the rigid catenary suspension device on the pantograph-catenary contact pressure is studied by changing the equivalent stiffness of the suspension device;in addition,the inter locking joint is added to the finite element model of the rigid catenary based on solid element,and the bolt connection between the inter locking joint and the overhead conductor rail is realized by the MPC coupling method.The influence of the collapse failure of the overhead conductor rail on the contact pressure of the pantograph-catenary system is analyzed by injecting the collapse failure at the junction of the overhead conductor rail.The simulation method which is used to study the influence of different faults on the contact characteristics of the pantograph-catenary system can save the test cost and provide theoretical basis for fault prediction and diagnosis of the pantograph system.