Investigation into noise attenuation strategies within train tunnels

Williams, P; Karimi, M; Sepehrirahnama, S; Garcia, JR; Croft, B; Hanson, D; Miller, A; Parnell, J

Investigation into noise attenuation strategies within train tunnels

Williams, P

Karimi, M

Sepehrirahnama, S

Garcia, JR Croft, B Hanson, D Miller, A Parnell, J

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Publication Type:: Conference Proceeding
Citation:: Proceedings of Acoustics 2024: Acoustics in the Sun, 2024
Issue Date:: 2024-01-01

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Field	Value	Language
dc.contributor.author	Williams, P https://orcid.org/0000-0002-0270-4090
dc.contributor.author	Karimi, M https://orcid.org/0000-0002-2949-5364
dc.contributor.author	Sepehrirahnama, S https://orcid.org/0000-0002-3280-3321
dc.contributor.author	Garcia, JR
dc.contributor.author	Croft, B
dc.contributor.author	Hanson, D
dc.contributor.author	Miller, A
dc.contributor.author	Parnell, J https://orcid.org/0000-0002-9100-1505
dc.date.accessioned	2025-03-22T02:50:57Z
dc.date.available	2025-03-22T02:50:57Z
dc.date.issued	2024-01-01
dc.identifier.citation	Proceedings of Acoustics 2024: Acoustics in the Sun, 2024
dc.identifier.uri	http://hdl.handle.net/10453/186120
dc.description.abstract	Across Australia, cities are extending their public transportation systems through additional tunnels and metro systems. The sound energy generated by metro trains operating in tunnels is mainly confined within the tunnel by the tunnel walls, causing higher noise levels within the carriages than comparable above-ground networks. This work investigates in-tunnel noise using a computational model of the metro tunnel, with the objective of developing a tool that can be used to investigate a range of novel mitigation measures. A numerical model is developed that uses the semi-analytical finite element (SAFE) method to provide a novel modal-based approach towards tunnel noise modelling. The first stage of this method involves performing a two-dimensional finite element eigenvalue decomposition over the cross-section of the tunnel to determine the characteristics of each tunnel mode. Propagation of sound pressure along the length of the tunnel is then implemented analytically, avoiding the computational expense of three-dimensional standard finite element methods. For simplicity, the carriage can be included as a rigid body, and the variations of the tunnel cross-section are neglected. Predictions are compared to the measured in-tunnel noise generated using a known input source. Numerical and experimental studies will allow for the investigation of cost-effective noise reduction solutions that may be applied to current and future rail projects.
dc.language	en
dc.relation.ispartof	Proceedings of Acoustics 2024: Acoustics in the Sun
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.title	Investigation into noise attenuation strategies within train tunnels
dc.type	Conference Proceeding
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
pubs.organisational-group	University of Technology Sydney/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Audio, Acoustics and Vibration (CAAV)
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Audio, Acoustics and Vibration (CAAV)/Centre for Audio, Acoustics and Vibration (CAAV) Associate Members
utslib.copyright.status	recently_added	*
dc.date.updated	2025-03-22T02:50:55Z
pubs.publication-status	Published

Abstract:

Across Australia, cities are extending their public transportation systems through additional tunnels and metro systems. The sound energy generated by metro trains operating in tunnels is mainly confined within the tunnel by the tunnel walls, causing higher noise levels within the carriages than comparable above-ground networks. This work investigates in-tunnel noise using a computational model of the metro tunnel, with the objective of developing a tool that can be used to investigate a range of novel mitigation measures. A numerical model is developed that uses the semi-analytical finite element (SAFE) method to provide a novel modal-based approach towards tunnel noise modelling. The first stage of this method involves performing a two-dimensional finite element eigenvalue decomposition over the cross-section of the tunnel to determine the characteristics of each tunnel mode. Propagation of sound pressure along the length of the tunnel is then implemented analytically, avoiding the computational expense of three-dimensional standard finite element methods. For simplicity, the carriage can be included as a rigid body, and the variations of the tunnel cross-section are neglected. Predictions are compared to the measured in-tunnel noise generated using a known input source. Numerical and experimental studies will allow for the investigation of cost-effective noise reduction solutions that may be applied to current and future rail projects.

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http://hdl.handle.net/10453/186120