Research On Key Technology And Scheme Of 200km/h High Speed Rigid Overhead Contact Line

The rigid overhead contact line is arranged along the road to provide traction power for the train by contacting with the pantograph.Guangzhou Metro Line 2 is the first line introduced by China’s rail transit to adopt rigid overhead contact line system.The Beijing Daxing Airport Line,which opened in 2019,uses an AC 25 k V power supply system with an rigid overhead contact line system running at a speed of 160 kilometers per hour,which creates the highest operating speed of rigid overhead contact line system in China.The design speed of the newly built Sichuan-Tibet railway reaches 200km/h,and the total length of newly built tunnels of Sichuan-Tibet railway is about 850 km.The rigid overhead contact line has great technical advantages for the engineering characteristics of Sichuan-Tibet Railway.Therefore,it is necessary to carry out research on the key technical schemes of 200km/h rigid overhead contact line.It provides the basic theory for the application of 200km/h rigid overhead contact line.This paper adopts the idea of theory-practice-theory,establishes the coupling model of pantograph with catenary by combining mathematical theory,computer simulation and line test,to researches the key technical scheme of 200km/h high-speed conductor rail.Firstly,3d simulation models of pantograph and rigid overhead contact line were established based on finite element method,and dynamic coupling simulation models of pantograph and rigid overhead contact line were established based on penalty function method.Secondly,the online test of Beijing Daxing International Airport line of 160km/h was carried out with reference to the evaluation index of dynamic simulation of pantograph with catenary of EN50367 and EN50318.The dynamic performance evaluation index of pantograph with catenary was obtained and compared with the simulation results of dynamic coupling simulation model.The accuracy of dynamic coupling simulation model of pantograph with catenary is verified.Finally,a multi-combination simulation calculation model was established,and parameters such as pantograph model,span,stiffness of clamp,overlap,rigid-flexible transition scheme and of rigid overhead contact line were obtained through coupling simulation calculation of pantograph with catenary,forming the key technical scheme of 200km/h high-speed rigid overhead contact line.The results show that the operation performance of DSA380 pantograph is more advantageous at the speed of 200km/h.Secondly,with DSA380 pantograph as the research object,it is concluded that the 7m span is more suitable for 200km/h rigid overhead contact line.Then,with the 7m span as the basic condition,the overlap length of 6.5m and 9m were established respectively.Through the dynamic simulation of the bow network,it was concluded that the high-speed rigid overhead contact line with the overlap length of 6.5m and the first suspension point raised by 4mm had more advantages.When the stiffness of clamp is 100 k N/m,the dynamic performance of pantograph with catenary is the best.It is concluded that the clamp stiffness of 200km/h rigid overhead contact line should be 100 k N/m.Finally,the rigid-flexible transition simulation model is established,and the stiffness of the clamp in the rigid-flexible transition section is reduced to 100 k N/m,which can meet the requirements of the pantograph passing through the rigid-flexible transition section at the speed of 200km/h.