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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

doi:10.4203/ccp.102.31

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R. Ferrara, G. Leonardi, F. Jourdan, "A Two-Dimensional Numerical Model to Analyze the Critical Velocity of High Speed Infrastructure", in , (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 31, 2013. doi:10.4203/ccp.102.31

Keywords: critical speed, contact-force, modal analysis, track receptance.

Summary

This paper illustrates the phenomenon of the critical speed in the range 100-300 km/h. A real explanation and a precise calculation of the critical speed seems to rest an unresolved problem in many cases. Some authors, analogous to 'Mach effect', have attributed this phenomenon to reaching the Rayleigh wave speed of substructure by trains. But this explanation cannot be thorough in many cases because the Rayleigh wave speed is very high and the phenomenon happens even for lower speeds. This paper shows an evident relationship between the receptance of the train/track coupling system and the so called sleeper-passing frequency. It is show that the amplification of vibrations happens when the train speed causes the equivalence between the sleeper-passing frequency and the receptance of the train/track coupling system. This explanation 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	Civil-Comp Proceedings ISSN 1759-3433 CCP: 102 PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: Paper 31 A Two-Dimensional Numerical Model to Analyze the 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/ccp.102.31 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 the Critical Velocity of High Speed Infrastructure", in , (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 31, 2013. doi:10.4203/ccp.102.31 Keywords: critical speed, contact-force, modal analysis, track receptance. Summary This paper illustrates the phenomenon of the critical speed in the range 100-300 km/h. A real explanation and a precise calculation of the critical speed seems to rest an unresolved problem in many cases. Some authors, analogous to 'Mach effect', have attributed this phenomenon to reaching the Rayleigh wave speed of substructure by trains. But this explanation cannot be thorough in many cases because the Rayleigh wave speed is very high and the phenomenon happens even for lower speeds. This paper shows an evident relationship between the receptance of the train/track coupling system and the so called sleeper-passing frequency. It is show that the amplification of vibrations happens when the train speed causes the equivalence between the sleeper-passing frequency and the receptance of the train/track coupling system. This explanation 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 the book description purchase this book (price £65 +P&P)
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