Research On The Current-collecting Traits Of Electrified Railway's Pantograph-catenary System

Since the energy of high-speed locomotive is obtained by pantograph from catenary, the contact stability between the pantograph and catenary is of great importance to keep the quality of current-collecting. However, with the speed increasing of train, the contact force would varies extremely and thus causes self-excited vibration. When its intensity oversizes, contact-loss is inevitable. This phenomenon does harm to the traction power suply, for it not only leads to the depravation of current-collecting but also creates radio influence, consequently accelerates the pantograph slide's and contact-wire's abration as well as damages the electrical appliances of train. Being serious, train withdrawn from schedule has to conduct and would bring tremendous economic losing to the country. This paper outlines the requirement of stable current-collecting of the pantograph-catenary system, and discusses thoroughly about the characteristics of which, in hopes of providing a beneficial reference for the development of domestic electrified railway.First of all, the thesis selects euler beam as model of ocs according to the distinctive features of which and flexible cable structure. Then, through in-depth discussion of the ocs model with finite element analysis software ANSYS, we have the static stiffness, free vibration properties, and the influence that some parameters such as nonsteady velocity, ocs tension force, structure height and span length on natural frequency of simple catenary. Afterwards, perpendicular coupling kinetic model is established based on binary pantograph model, ulteriorly the group of pantograph-ocs system's movement differential equations is derived from Lagrange's equation and solved with the method of Newmark by compiling numerical emulation program. Given a set of technical parameters, the current-collecting situation could be emulated, and the effectiveness of the model is validated in compare with the real testing data sampled from the second lanzou-wuwei line. In succession, by using of the simulative program under various running conditions, we studies the different effects that various parameters on the dynamic current-collecting such as running speed, span length, ocs tension force, masses of pantograph head and framework, damping capacity and stiffness etc. Moreover, measures are suggested to improve the quality of current-collecting, especially the idea of active control scheme, which restains the fluctuation of contact force by modulating the air pressure of pantograph's airbag.