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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 83

Use of Axle-Box Acceleration to monitor Track Vertical Geometry and Short Defects of Rails

S. Neveu, T. Vicol and F. Coudert

Track Design Department, SNCF Project Engineering System, La Plaine-Saint-Denis, Paris, France

Full Bibliographic Reference for this paper
S. Neveu, T. Vicol, F. Coudert, "Use of Axle-Box Acceleration to monitor Track Vertical Geometry and Short Defects of Rails", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 83, 2014. doi:10.4203/ccp.104.83
Keywords: axle-box acceleration, rail defect, track geometry, signal processing.

Summary
The axle-box acceleration acquisition system has been installed on the high-speed measuring train IRIS320 in 2007. This technology has many advantages: the measurement can easily be performed on both high-speed and conventional trains and its development remains less expensive than industrializing a new system. The SNCF Track Design department has developed two applications using vertical accelerations: the first one aims at detecting small defects of the rail such as ballast pits, bent rails and loose sleepers on high-speed lines; the second one allows reconstructing vertical track geometry signals. These two applications were validated by comparing the axle-box accelerations with in-line measurements of the track geometry and field observations.

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