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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
Edited by: J. Pombo
Paper 30

Aerodynamic Loads on Lightweight Railway Vehicles for the Evaluation of Rollover Risk

F. Cheli1, S. Giappino1, G. Tomasini1, M. Villani1 and G. Zanetti2

1Department of Mechanical Engineering, Politecnico di Milano, Italy
2AnsaldoBreda Costruzioni Ferroviarie, Pistoia, Italy

Full Bibliographic Reference for this paper
F. Cheli, S. Giappino, G. Tomasini, M. Villani, G. Zanetti, "Aerodynamic Loads on Lightweight Railway Vehicles for the Evaluation of Rollover Risk", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 30, 2014. doi:10.4203/ccp.104.30
Keywords: lightweight railway, crosswind, rollover risk, force aerodynamics coefficients, wind tunnel tests.

In this paper, the effects of lateral wind on two different light-weight trains, characterised by different geometries and lengths and by different mass distribution, are investigated. In order to compare the two trains in terms of response to cross wind, two subsequent analyses have been performed: measurement of the force aerodynamic coefficients by means of wind tunnel tests on scale models, and evaluation of the rollover risk by means of the definition of the characteristic wind curve (CWC) through a simplified numerical procedure, based on the static equilibrium, proposed by the TSI standard (three mass model). As expected, the longer train presents the larger aerodynamic coefficients. However, differences on the lateral force coefficient and rolling moment coefficient arise also due to the different geometry of the trains in the upper part of the carbody. Finally, from the CWC evaluation, it has been found that variations between the two trains reduce at low wind angle and at low vehicle speed.

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