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Y. Cha¹, U. Olofsson¹, M. Gustafsson² and C. Johansson³

¹Department of Machine Design, KTH Royal Institute of Technology, Stockholm, Sweden
²VTI The Swedish National Road and Transport Research Institute, Linköping, Sweden
³SLB Analys, Technical Department, Stockholm, Sweden

Keywords: airborne particulates, individual train, particulate concentration, size distribution, tunnel environment, principal component analysis.

Summary

In order to detect the concentrations and size distributions of airborne particles that were generated by individual moving trains on an underground railway platform, a series of real-time measurements were undertaken. The measurement range covered the ultrafine (less than 100 nm) and partly the fine (100 nm to 2.5 µm), but not the coarse fraction (2.5 to 10 µm). The results show that the individual trains with stop and start at the platform elevate substantially the particulate number concentrations with a diameter size greater than 100 nm. Two size modes of the particulate number concentrations are obtained. One mode peaks around 170 nm when a train stopped/started, while the other is around 30 nm when no train operated in the station. By using principal component analysis, four components are extracted from the thirty two-analyzed particulate sizes, indicating four different contributors in those detected particles. It is revealed from this study that the particulate matter released by individual moving trains (mainly through mechanical wear and turbulent resuspension) is a key contributing source of the fine particles on underground railway platforms, which can be separated from the background by their different size distributions.

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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 295 On Particulate Emissions from Individual Trains in Tunnel Environments Y. Cha¹, U. Olofsson¹, M. Gustafsson² and C. Johansson³ ¹Department of Machine Design, KTH Royal Institute of Technology, Stockholm, Sweden ²VTI The Swedish National Road and Transport Research Institute, Linköping, Sweden ³SLB Analys, Technical Department, Stockholm, Sweden doi:10.4203/ccp.110.295 purchase the full-text of this paper Full Bibliographic Reference for this paper Y. Cha, U. Olofsson, M. Gustafsson, C. Johansson, "On Particulate Emissions from Individual Trains in Tunnel Environments", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 295, 2016. doi:10.4203/ccp.110.295 Keywords: airborne particulates, individual train, particulate concentration, size distribution, tunnel environment, principal component analysis. Summary In order to detect the concentrations and size distributions of airborne particles that were generated by individual moving trains on an underground railway platform, a series of real-time measurements were undertaken. The measurement range covered the ultrafine (less than 100 nm) and partly the fine (100 nm to 2.5 µm), but not the coarse fraction (2.5 to 10 µm). The results show that the individual trains with stop and start at the platform elevate substantially the particulate number concentrations with a diameter size greater than 100 nm. Two size modes of the particulate number concentrations are obtained. One mode peaks around 170 nm when a train stopped/started, while the other is around 30 nm when no train operated in the station. By using principal component analysis, four components are extracted from the thirty two-analyzed particulate sizes, indicating four different contributors in those detected particles. It is revealed from this study that the particulate matter released by individual moving trains (mainly through mechanical wear and turbulent resuspension) is a key contributing source of the fine particles on underground railway platforms, which can be separated from the background by their different size distributions. 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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