Study On The Dynamics Of Pantograph/Catenary System Considering Contact Wire Unevenness

In the present world, high speed has been the obvious developing trend of electric railway. Since the6th raising of the railway speed in China, the length sequens of high-speed electric railway with the operation speed over200km/h has reached11028km. In course of high-speed electric railway, the interaction between pantograph and catenary is being aggravated. Some influencing factors which could be ignored at low speed has a notably significant effect on pantograph-catenary system. Even these have been the obstruction of the further development of high-speed train. Contact line unevenness is one of them. The unevenness leads to the increasing of contact force fluctuation, off-line or collision of pantograph and catenary, and the unstability of the running train. Therefore, the research on pantograph-catenary dynamics performance with contact line unevenness or not has important effect on the development of high-speed electric railway.In addition, China is basking in a great boom in high-speed train. It has significance for independence of equipments. However, the pantographs which has been used in high-speed train of our country were either imported from overseas or improved from introduced pantograph. The home-grown high-speed pantographs have not realized engineering application. It’s of great significance for the further development of our country’s high-speed train. Therefore, The study on the feasibility and effectiveness of home-grown high-speed pantographs serving in existing high-speed lines is necessary.For the above reasons, reaches have been done in this essay:The contact wire unevenness for several high-speed lines has been measured in this paper. The maximum entropy spectrum estimation is applied for the power spectral density. The unevenness status of contact lines is analyzed. A new unevenness spectrum model with universality and concise form is built. Based on the power spectrum model, the sample of contact line unevenness is generated. Considering the unevenness into the catenary model, the comparison analysis with contact wire unevenness or not is completed using mode superposition method. The catenary model is improved.Based on the improved catenary model, the adaptability of V500-type pantograph running in existing high-speed line is studied. The dynamics performance between V500-type pantograph and existing high-speed line is analyzed at current operational speed. And the optimization of parameters has been done for the system to realize the super high running speed over350km/h. The static strength and fatigue strength checking at current operational speed are performed. The results could provide a basis of V500-type pantograph for safety running. The air force is applied to the surface of pantograph parts to simulate the influence of airflow. An analytic method for pantograph dynamic stress is put forward in this paper, based on the regular cross section shapes of the pantograph components. Simple, rapid and efficient, the analytic method could make the calculation of pantograph dynamic stress with long distance true, which will improve the credibility of fatigue strength analysis of pantograph.