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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
Edited by: J. Pombo
Paper 200

Rail vibrations: Data Analysis and FE Modelling with Applications to Signalling Equipment

A. Bracciali, M. Macherelli and F. Piccioli

Dipartimento di Ingegneria Industriale, Università di Firenze, Italy

Full Bibliographic Reference for this paper
A. Bracciali, M. Macherelli, F. Piccioli, "Rail vibrations: Data Analysis and FE Modelling with Applications to Signalling Equipment", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 200, 2014. doi:10.4203/ccp.104.200
Keywords: rail, sleeper, vibrations, track, model, standard, point machine, signalling equipment.

The paper shows the vertical vibration frequency response function of the rail on a sleeper, mid span and quarter span on a number of different tracks, highlighting the differences. Vibration data recorded during trains pass-by are compared, showing how the relevant railway standards may be misleading in some situations. A simplified finite element model of a track is developed to investigate the influence of railpad stiffness, poor tamping conditions and heavy masses connected to the rail. Heavy signalling equipment connected to the rail, e.g. an in-sleeper point machine, can significantly modify the rail vibration environment to which such equipment are subjected. General considerations are drawn on testing strategy both on line and in the laboratory to ensure both the best correspondence to real conditions and the feasibility of the test.

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