Research On The Structural Optimization For The Transition Sections Of Overhead Rigid Catenary With AC25kV

Overhead rigid catenary is widely used in traction power supply system of urban rail transit.With the rapid development of Chinese economy,the population of the city is increasing,the size of the city is becoming larger and the distance between railway stations is increasing,so the speed of the electrified train must be improved.In order to meet greater capacity and faster speed,we need to use higher efficiency AC power instead of the existing DC power supply.With the increase of speed,whether the existing rigid catenary structure can achieve good operation under 160km/h becomes a problem that needs to be studied.In the Overhead rigid catenary,the transition section with the overlap and the rigid flexible transition is usually an important area that restricts the dynamic performance of the pantograph and catenary.Therefore,it is of great significance to research the structure of the overhead rigid catenary transition section.(1)By understanding and learning the knowledge about rigid catenary simulation modeling,the principle is analyzed.Based on the evaluation index of the interaction of pantograph and catenary,finite element models of pantograph,overhead rigid catenary and rigid and flexible transition section in rigid catenary is established.The pantograph catenary coupling model is established based on the analysis of pantograph catenary dynamic interaction.(2)In order to verify the validity of the model,in accordance with the requirements of standard EN50318,the measured data from the north line of Guangzhou Metro Line 3,Beijing Tianjin intercity rail and Beijing-Shanghai high-speed railway are compared with the simulation data,which include pantograph and catenary contact force,vertical displacement of pantograph and uplift of locating point.(3)According to the influence of velocity,span,elasticity and elastic inhomogeneity in OCS to the dynamic interaction of pantograph and catenary,the influence of the parameters of speed,span and contact stiffness on the dynamic properties of the pantograph-OCS systems in overhead rigid catenary is extended to the overhead rigid catenary.(4)The influence of structural parameters such as speed,span and contact stiffness on the dynamic performance of transition catenary in rigid catenary is analyzed respectively.Various parameters of the structural parameters are selected to simulate the overlapping section and rigid flexible transition of the anchors,and the simulation data of the contact force and the pantograph displacement under various conditions are obtained.According to the data,the influence of the structure parameters on the flow quality of the pantograph and catenary is obtained and the technical parameters of the transition section structure are optimized and screened according to the conclusion.Finally,the structure and technical parameters which can adapt to the maximum speed of 160km/h are obtained,and an optimization scheme for the transition section of the Overhead rigid catenary is proposed.