Microscale Simulation And Quantification Of Abrasion Loss On The Pantograph-catenary Contact Interface

In the high-speed railway transportation system, the pantograph-catenary system is a key equipment which provide the electric power for the train. Pantograph-catenary contact interface conditions have an direct influence on the life of the pantograph contact strips and contact line, and also affect continuous running time of the electric locomotives, running speed and operation safety. In order to ensure power transmission efficiency and stability of the pantograph-catenary system, the tribological behavior of the pantograph-catenary contact interface have been discussed from wear factors of the pantograph-catenary contact interface. In this thesis, a combination method with experiment and numerical simulation has been used to analyze the abrasion loss of contact strips which is based on the surface roughness before and after service of the pantograph-catenary contact interface. The abrasion loss of contact strips has been influenced by the train running speed, transmission current, and the contact pressure.1. In accordance with the surface roughness before and after service of pantograph contact strips the fractal method is applied to structure surface modeling and to reconfiguration rough surface of the pantograph contact strips in the software environment. Then the reconstructed two-dimensional surface profile curves were compared with the lateral surface profile curves which measured by the Profilometer to verify the accuracy of the reconstruction methods.2. Abrasion loss of pantograph contact strips on the pantograph-catenary contact interface can be regarded as a objectively standardization to evaluate the friction and wear processes on the pantograph and catenary contact interface, and also it is an important basis to study friction and wear behavior of the pantograph-contact contact interface. based on the surface data before and after service of pantograph contact strips, the IBM method is used to quantify the wear loss of the pantograph contact strips, and to deduced the calculating formulas of wear loss on the pantograph contact strips according to the measured roughness data and profile bearing length ratio for the pantograph contact strips before and after service.3. Friction and wear behavior of the pantograph-catenary contact interface are influenced by the train speed, transmission current, contact pressure, etc.. According to the test data during the combined adjusting and test of a special transportation railway for Passenger in China, the relationship between train speed and the contact pressure, and the relationship between transmission current and contact pressure are achieved synthetic study, and analyzed speed, current, and contact pressure to affect on the wear loss of pantograph contact strips. Through a large number of friction and wear carriers current test, the results show that the temperature is a significant characterized variable which can be regarded as a sign of wear degree. The temperature rise is synchronization change with growth of wear loss. So then in COMSOL Multiphysics software environment, to establish a coupled finite element model of Joule heat and friction heat on the pantograph-catenary contact interface. Through the simulation analysis, the vary relationships between wear loss and temperature field distribution on the contact interface of pantograph contact strips have been evaluated under the different transmission currents, running speed and contact pressure.