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Identification of Bending Modes of Vibration in Rails by a Laser Doppler Vibrometer on a Moving Platform

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Abstract

This paper introduces a method to identify the bending modes of vibration of railway tracks by using a laser Doppler vibrometer (LDV) mounted on a moving platform. Two sets of experiments were conducted at Transportation Technology Center Inc. (TTCI) in Pueblo Colorado, in order to validate the proposed method. First, the bending vibration modes were identified using the signals collected from a rail span (rail section between two consecutive sleepers) by accelerometers under moving car excitation. Then, vibration measurements from rail spans were obtained by using an LDV mounted on the moving railcar. All tests were carried out at four different rail car speeds: 8 km/h (5 mph), 16 km/h (10 mph), 35 km/h (22 mph), and 45 km/h (28 mph). To find LDV signal segments corresponding to rail spans, a novel approach based on the sleeper passing frequency is introduced. Comparison of the results from both sets of tests demonstrated good agreement for all speeds.

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Acknowledgments

This work has been supported under the grant DTFR53-17-C-00024 awarded by the Federal Railroad Administration of the U.S. Department of Transportation. The authors are grateful to Robert Wilson, program manager of the FRA, for his technical guidance and valuable comments during all phases of this research, to Vikrant Palan of Polytec, and to Brian Lindeman of TTCI for providing technical and logistic support during field tests.

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Authors and Affiliations

  1. Department of Civil, Environmental and Architecture, The University of Texas at Austin, 10100 Burnet Road, Building 24, Austin, TX, 78758, USA

    K. Kaynardag, A. Ebrahimkhanlou & S. Salamone

  2. Dipartimento di Ingegneria, Università degli Studi di Palermo, viale delle Scienze Ed. 8, 90128, Palermo, Italy

    G. Battaglia & A. Pirrotta

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  1. K. Kaynardag
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  2. G. Battaglia
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  3. A. Ebrahimkhanlou
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  5. S. Salamone
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Correspondence to S. Salamone.

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Kaynardag, K., Battaglia, G., Ebrahimkhanlou, A. et al. Identification of Bending Modes of Vibration in Rails by a Laser Doppler Vibrometer on a Moving Platform. Exp Tech 45, 13–24 (2021). https://doi.org/10.1007/s40799-020-00401-9

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  • DOI: https://doi.org/10.1007/s40799-020-00401-9

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