| High-speed railway has developed rapidly all over the world with its great advantages, such as high speed, large transport capacity, low energy consumption, light pollution, less occupation of the land, high safety and comfort performance. With great effort in learning new technology from abroad and planning high-speed train network actively, train speeds in China have been raised enormously in short period by construction of new high-speed passenger lines and updating technology on existing lines. However, some negative results arise from this progress regarding the pantograph/catenary system, which includes enhancing interaction forces, loss of contact, more serious electric arc and worse collecting current performance for pantograph/catenary system. Because of these problems undermining the safe running of high speed train, studies on dynamics of pantograph/catenary system become important in the aspects of both theory and practice.Funded by the Natural Science Foundation Committee of China (Nos.59875072), the Foundation of PhD Student Education of Education Ministry of China (Nos.2000061302) and the Scientific Project of Railway Ministry of China (Nos.2000J030, Z2006-046 and 2009BAG12A05), studies in this paper mainly centered on various aspects below.a) Studies on pantograph, catenary and their interaction in the past and now in the world are reviewed. The significance and research focus of pantograph/catenary are indicated.b) A pantograph calculation model is established. The influence of the vertical and longitudinal vibration of the train on the pantograph and the aerodynamic loads of the pantograph itself are not only taken into account, but also the lateral displacement of the contact point between the contact wire and the contact strip is considered. A corresponding numerical program is developed. The pantograph model is more complex than the vertical linear lumped model usually used at present. For the mounted/unmounted airfoil the aerodynamic characteristics of the pantograph is tested and the aerodynamic loads are gained through the wind tunnels.c) The parametric identification model is built for SDOF considering nonlinear factors. Parameters (such as mass, stiffness, damping) are measured by means of experiments to obtain those parameters specific for linear model of the pantograph.d) A calculation model of catenary is established which take into consideration both the influence of vertical vibration of catenary in perpendicular direction and the effect of lateral vibration of catenary in transverse direction. A relevant numerical program is developed. To obtain the equivalent damping in the model, non-contact optics measurement is adopted to test the catenary's vibration. The static stiffness, equivalent mass and modes of catenary are calculated and analyzed.e) A calculation model of the pantograph/catenary coupling system is established, comprising of some dynamics models, such as the rigid conductor/pantograph model, the flexible catenary/pantograph and their connection transition. The new explicit integral method developed by Prof. Wanming Zhai is adopted to solve the equations. The simulation is validated by example of EN50318.f) By using hybrid method, the test rig of the pantograph/catenary system is built to measure the performance of the pantograph and to study on parameter matching between the pantograph and the catenary as well as structural characteristics of pantograph.g) The dynamic model of the pantograph/catenary coupling system installed on bridges is established. Influences of vibration of the vehicle/bridge on the performance of the pantograph/catenary are analyzed. |
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