Development Of Pantograph Catenary Current Collection Experimental Platform For Rail Transit Based On Scaled Model

With the full implementation of the 14 th Five Year Plan,China’s railway construction has ushered in a new period of development.The construction of high-speed railway,urban rail transit and intercity railway has ushered in a new development period.One trend of the development of rail transit construction is to increase the running speed of trains.However,with the increase of train speed,the interaction between pantograph and catenary restricts the further increase of train speed.The coupling vibration between pantograph and catenary is intensified,even off-line.In order to study the pantograph catenary relationship by experimental method,the pantograph catenary current collection platform of rail transit is designed and constructed in this paper.Firstly,the vibration equation and natural frequency of the beam under moving load are analyzed when the catenary is equivalent to a single beam model.In the simulation software,according to the Beijing Tianjin Intercity simple chain catenary,the pantograph catenary coupling model is established,and the rationality of the model is verified.Secondly,according to the similarity theory,the experimental platform of pantograph catenary relationship scaled model is designed.The scaling coefficients of the physical quantities involved in the interaction between pantograph and catenary are derived.Two kinds of scaling models are designed from the theory,which are geometric similarity model and geometric dissimilarity model.The rationality of the theoretical derivation of scaling coefficient is verified in MSC.Marc software,and the practical method of making scaling model is given.From the static and dynamic characteristics of the catenary,the rationality of the scaling method is verified.Then,the pantograph catenary current collection experimental platform of rail transit is constructed.The structure of subgrade,track and vehicle of the platform is analyzed and designed.The catenary structure of pantograph catenary relationship scale experiment platform,pantograph catenary off-line arc experiment platform,rigid suspension platform with metal rubber elements and rigid flexible suspension catenary platform are designed.The structure of pantograph catenary relationship scale experiment platform and pantograph catenary arc experiment platform are designed to simulate the dynamic relationship between catenary and pantograph and the process of generating off-line arc during pantograph operation.The wireless acquisition system of contact force and the acquisition system of pantograph catenary arc voltage,current and light intensity are designed.Finally,the experimental platform of pantograph catenary relationship scaled model is debugged and analyzed.The influence of catenary tension,catenary span and dropper spacing on contact stiffness is analyzed.The influence of running speed on the statistical value of pantograph catenary contact force is analyzed.The relationship between the catenary tension and the statistical value of contact force,the component of span and the component of dropper space is analyzed.From the static and dynamic characteristics of the catenary,the rationality of the platform design is verified.