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Keywords: aerodynamic noise, non-linear acoustic solver, crosswind, detached eddies, flow separations, flow reattachments.

Summary

The aerodynamic loads and noise of high speed trains deteriorate rapidly in crosswind conditions. Typical study usually focuses on the characteristics of aerodynamic loads and corresponding safety issues, while less on the noise characteristics. In the present paper, a hybrid NLAS/FW-H approach has been adopted to investigate the near field and far field noise of high speed trains under different yaw angles. As the root of acoustic field, typical flow phenomena in crosswind conditions has been firstly analyzed, and flow separations and reattachments on the train surface have been discussed in detail. For the near field analysis, the asymmetric characteristics of acoustic field have been studied and the comparison with that in no crosswind conditions has been performed. For the far field analysis, the comparison of the acoustic intensity of probes in the windward and leeward sides has been performed, and a linear relationship between the yaw angle and the acoustic intensity has been obtained. Results in this paper could aid in the study of amenity problem for trains running in complex conditions.

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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: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 8 Characteristics of Train Noise in Crosswind Conditions Z.X. Sun, G.W. Yang and D.L. Guo Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China doi:10.4203/ccp.104.8 purchase the full-text of this paper Full Bibliographic Reference for this paper Z.X. Sun, G.W. Yang, D.L. Guo, "Characteristics of Train Noise in Crosswind Conditions", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 8, 2014. doi:10.4203/ccp.104.8 Keywords: aerodynamic noise, non-linear acoustic solver, crosswind, detached eddies, flow separations, flow reattachments. Summary The aerodynamic loads and noise of high speed trains deteriorate rapidly in crosswind conditions. Typical study usually focuses on the characteristics of aerodynamic loads and corresponding safety issues, while less on the noise characteristics. In the present paper, a hybrid NLAS/FW-H approach has been adopted to investigate the near field and far field noise of high speed trains under different yaw angles. As the root of acoustic field, typical flow phenomena in crosswind conditions has been firstly analyzed, and flow separations and reattachments on the train surface have been discussed in detail. For the near field analysis, the asymmetric characteristics of acoustic field have been studied and the comparison with that in no crosswind conditions has been performed. For the far field analysis, the comparison of the acoustic intensity of probes in the windward and leeward sides has been performed, and a linear relationship between the yaw angle and the acoustic intensity has been obtained. Results in this paper could aid in the study of amenity problem for trains running in complex conditions. 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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