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Keywords: high-speed train, lateral vibration, expansion wave, train tail entering, tunnel pressure-effect, DNS, immersed boundary method, ghost cell, vibration analysis.

Summary

It is well known that the vibration of the high-speed trains running in a tunnel becomes larger than that at the open section. This vibration was explained mainly by the aerodynamic flow separation from the surface of trains. It is, however, not enough to explain the lateral vibration of the trains running in a tunnel only by flow separation and vortex shedding, because of the existence of pressure wave effects in the tunnel. This paper focuses on the relation between the train lateral vibration and expansion waves generated by train tail entering into a tunnel. In this paper a combined simulation of flow and vibration has been developed with CFD and vibration dynamics. Moreover, the comparison of simulation data has been carried out with field measurement from the high-speed train (Shinkansen). From the first-stage results of the two-dimensional numerical simulation of flow and the field measurement, it is confirmed that the pressure difference at the train sides is caused by expansion waves produced and passing through the train cars. The acceleration data from the simulation of vibration based on the CFD pressure results are compared with field measurement data. The study reported in this paper shows that expansion wave from the train tail entering has a strong effect on the lateral vibration in the tunnel.

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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: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 40 Aerodynamic and Pressure Effects on Lateral Vibration of High-Speed Trains H. Akai¹, S. Takahashi², M. Ota¹ and K. Maeno³ ¹Mechanical Engineering, Chiba University, Japan ²Department of Prime Mover Engineering, Tokai University, Kanagawa, Japan ³National Institute of Technology, Kisarazu College, Chiba, Japan doi:10.4203/ccp.110.40 purchase the full-text of this paper Full Bibliographic Reference for this paper H. Akai, S. Takahashi, M. Ota, K. Maeno, "Aerodynamic and Pressure Effects on Lateral Vibration of High-Speed Trains", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 40, 2016. doi:10.4203/ccp.110.40 Keywords: high-speed train, lateral vibration, expansion wave, train tail entering, tunnel pressure-effect, DNS, immersed boundary method, ghost cell, vibration analysis. Summary It is well known that the vibration of the high-speed trains running in a tunnel becomes larger than that at the open section. This vibration was explained mainly by the aerodynamic flow separation from the surface of trains. It is, however, not enough to explain the lateral vibration of the trains running in a tunnel only by flow separation and vortex shedding, because of the existence of pressure wave effects in the tunnel. This paper focuses on the relation between the train lateral vibration and expansion waves generated by train tail entering into a tunnel. In this paper a combined simulation of flow and vibration has been developed with CFD and vibration dynamics. Moreover, the comparison of simulation data has been carried out with field measurement from the high-speed train (Shinkansen). From the first-stage results of the two-dimensional numerical simulation of flow and the field measurement, it is confirmed that the pressure difference at the train sides is caused by expansion waves produced and passing through the train cars. The acceleration data from the simulation of vibration based on the CFD pressure results are compared with field measurement data. The study reported in this paper shows that expansion wave from the train tail entering has a strong effect on the lateral vibration in the tunnel. purchase the full-text of this paper (price £22) 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 £85 +P&P)
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