On the implementation of an auxiliary pantograph for speed increase on existing lines
(English)Manuscript (preprint) (Other academic)
The contact between pantograph and catenary at high speeds suffers from high dynamic contact force variation due to stiffness variations and wave propagation. To increase operational speed on an existing catenary system, especially on soft catenary systems, technical upgrading is usually necessary. Therefore, it is desirable to explore a more practical and cost-saving method to increase the operational speed. Based on a 3D pantograph-catenary finite element model, a parametric study on two-pantograph operation with short spacing distances at high speeds shows that, although the performance of the leading pantograph gets deteriorated, the trailing pantograph feels an improvement if pantographs are spaced at a proper distance. Then two main positive effects, which can cause the improvement, are addressed. Based on a discussion on wear mechanisms, the paper suggests to use the leading pantograph as an auxiliary pantograph, which does not conduct any electric current, to minimize additional wear caused by the leading pantograph. To help implementation and achieve further improvement under this working condition, the paper investigates cases with optimized uplift force on the leading pantograph and with system parameter deviations. The results show that the two positive effects still remain with some system parameter deviations. 30% of speed increase should be possibly achieved still sustaining a good dynamic performance with help of the optimized uplift force.
IdentifiersURN: urn:nbn:se:kth:diva-174047OAI: oai:DiVA.org:kth-174047DiVA: diva2:857301
24th International Symposium on Dynamics of Vehicles on Roads and Tracks, Austria
QS 20152015-09-282015-09-282015-09-28Bibliographically approved