弓网滑动电接触摩擦磨损行为研究-机械设计及理论专业论文.docx

- - III - Abstract The pantograph catenary system is power source of electric locomotive of high-speed electrified railway. Current-carrying friction and wear are the main features of the sliding electrical contact state between pantograph and catenary wires. They constitute a special frictional pair coupled electro-mechanical wear under complex environmental conditions. Current-carrying friction and wear behavior between pantograph and catenary wire has become increasingly complex with the continuous increasing speed of electric locomotive. And more problems on current collection will occur under high-speed, which restricts the further acceleration of electric locomotive. Therefore, the friction and wear characteristics and the stability of current-carrying of the electric locomotive pantograph and contact wire were studied by relying on the National Natural Science Foundation of China (Research on wear steady-state under high-speed sliding electrical contact, NO.. A sliding electrical contact friction and wear tester was developed firstly (Patent No. CN200920012471.9). It can simulate actual operating conditions of electric locomotive, achieve uniform wear of pantograph and wire, and the friction coefficient, the contact point temperature, relative sliding speed, sliding back and forth movement frequency, the wear loss between contact wire and pantograph, contact current, contact voltage, contact resistance and other parameters are online measured in real time, and the data are saved, which can be achieved within a certain current, load, speed and other single-factor and multi-factor control. Monitoring interface and data processing system were designed based on LabView software. The data detected by the lower computer can be displayed and recorded real-timely, and waveform curve and the reports variously were generated, which create the conditions for further theoretical analysis. Through conducting lots of experiments on copper based powder metallurgy