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A. Bracciali, F. Piccioli, "Elimination of Failures in Railway Gearboxes by Regenerative Coasting", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 312, 2014. doi:10.4203/ccp.104.312

Keywords: gearbox, vibrations, bearings, failure, cage, railway, metro, traction control, regenerative coasting, power recirculation.

Summary

Railway gearboxes are subjected to vibrations arising from gear meshing, roller bearings forces and wheel-rail contact. This paper shows how peculiar service conditions made the application of a well known and perfectly working gearbox installed on a metro vehicle rather critical. After a long investigation, the root cause of the problem was found in running conditions at top speed, which happened for long distances in coasting, being a rather long section of the line made of quite distant stations on a mild slope line, a situation that that kind of vehicle never encountered in other lines. Remedies are discussed with reference to mechanical and electric features of the vehicle. The adoption of a new procedure, called "regenerative coasting" allowed to potentially solve the problem of premature failures in service.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 312 Elimination of Failures in Railway Gearboxes by Regenerative Coasting A. Bracciali and F. Piccioli Dipartimento di Ingegneria Industriale, Università di Firenze, Italy doi:10.4203/ccp.104.312 purchase the full-text of this paper Full Bibliographic Reference for this paper A. Bracciali, F. Piccioli, "Elimination of Failures in Railway Gearboxes by Regenerative Coasting", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 312, 2014. doi:10.4203/ccp.104.312 Keywords: gearbox, vibrations, bearings, failure, cage, railway, metro, traction control, regenerative coasting, power recirculation. Summary Railway gearboxes are subjected to vibrations arising from gear meshing, roller bearings forces and wheel-rail contact. This paper shows how peculiar service conditions made the application of a well known and perfectly working gearbox installed on a metro vehicle rather critical. After a long investigation, the root cause of the problem was found in running conditions at top speed, which happened for long distances in coasting, being a rather long section of the line made of quite distant stations on a mild slope line, a situation that that kind of vehicle never encountered in other lines. Remedies are discussed with reference to mechanical and electric features of the vehicle. The adoption of a new procedure, called "regenerative coasting" allowed to potentially solve the problem of premature failures in service. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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