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R. Ferrara^1,2, G. Leonardi² and F. Jourdan¹

¹Mechanical and Civil Engineering Laboratory, University of Montpellier 2, France
²Department of Civil, Energy, Environment and Materials Engineering, University of Reggio Calabria, Italy

Keywords: critical speed, Rayleigh wave, bending wave, train, track, railway, train-track interaction, contact-force, modal analysis, resonance.

Abstract

The vibrational phenomenon which occurs when a passing train excites the train-track coupled system with a frequency close to the resonance of the system is presented in this paper. On the assumption that the train velocity is strictly related to the excitation frequency, this paper shows how a new critical speed concept should be contemplated in train-track interaction, in addition to ones calculated by the Rayleigh and the bending waves theories. A two dimensional finite element–multi-body model was used to carry out the receptance analysis of the train-track coupled system. Moreover, thevertical vibrations that occur at different speeds have been evaluated to investigate the relationship between track vibrations and train velocity. The results show that the peak of vertical vibrations occurs when the sleeper-passing frequency equals the resonance frequency of the train-track coupled system. This relationship seems to be definitively complete even if only a numeric validation is presented in the paper.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	International Journal of Railway Technology ISSN 2049-5358 IJRT, Volume 3, Issue 2, 2014 A Two Dimensional Numerical Model to Analyze Critical Velocity of High Speed Infrastructure R. Ferrara^1,2, G. Leonardi² and F. Jourdan¹ ¹Mechanical and Civil Engineering Laboratory, University of Montpellier 2, France ²Department of Civil, Energy, Environment and Materials Engineering, University of Reggio Calabria, Italy doi:10.4203/ijrt.3.2.4 purchase the full-text of this paper Full Bibliographic Reference for this paper R. Ferrara, G. Leonardi, F. Jourdan, "A Two Dimensional Numerical Model to Analyze Critical Velocity of High Speed Infrastructure", International Journal of Railway Technology, 3(2), 59-77, 2014. doi:10.4203/ijrt.3.2.4 Keywords: critical speed, Rayleigh wave, bending wave, train, track, railway, train-track interaction, contact-force, modal analysis, resonance. Abstract The vibrational phenomenon which occurs when a passing train excites the train-track coupled system with a frequency close to the resonance of the system is presented in this paper. On the assumption that the train velocity is strictly related to the excitation frequency, this paper shows how a new critical speed concept should be contemplated in train-track interaction, in addition to ones calculated by the Rayleigh and the bending waves theories. A two dimensional finite element–multi-body model was used to carry out the receptance analysis of the train-track coupled system. Moreover, thevertical vibrations that occur at different speeds have been evaluated to investigate the relationship between track vibrations and train velocity. The results show that the peak of vertical vibrations occurs when the sleeper-passing frequency equals the resonance frequency of the train-track coupled system. This relationship seems to be definitively complete even if only a numeric validation is presented in the paper. 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 IJRT purchase this issue (price £70 +P&P)
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