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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 110
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

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.

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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