Parametric study of circular duct breakout transmission loss

Williams, P; Kirby, R; Karimi, M

Parametric study of circular duct breakout transmission loss

Williams, P Kirby, R

Karimi, M

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Publisher:: AAS
Publication Type:: Conference Proceeding
Citation:: Australian Acoustical Society Acoustics 2021 Wollongong: Making Waves, 2021, pp. 41-46
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Williams, P
dc.contributor.author	Kirby, R https://orcid.org/0000-0002-3520-1377
dc.contributor.author	Karimi, M https://orcid.org/0000-0002-2949-5364
dc.date	2021-02-21
dc.date.accessioned	2022-06-01T07:15:06Z
dc.date.available	2022-06-01T07:15:06Z
dc.date.issued	2021-01-01
dc.identifier.citation	Australian Acoustical Society Acoustics 2021 Wollongong: Making Waves, 2021, pp. 41-46
dc.identifier.isbn	9781713844266
dc.identifier.uri	http://hdl.handle.net/10453/157867
dc.description.abstract	Breakout from ducts can be a major source of noise on industrial sites. The emitted noise is harmful at sufficient levels and must be reduced. Reducing noise levels using appropriate methods after the fact can be both costly and time consuming. This can be avoided by correctly predicting duct transmission loss before the duct is installed and choosing a suitable construction. In this paper the breakout from circular ducts will be presented as part of a parametric study. Parameters such as duct radius and wall thickness will be used to allow for a suitable choice of duct construction. In practical systems duct radii can be several metres in diameter and this is reflected by the range of the study. The breakout noise is calculated using a semi analytic finite element method. The first step in this method requires determination of the duct's modal properties which is calculated using a numerical eigenvalue analysis. The waves are then propagated along the duct using an analytic expression. A monopole sound source is used to excite the system, simulating the complex acoustic field within HVAC ducts with the transmission loss calculated from the difference between radially propagating sound power to axially propagating sound power.
dc.language	en
dc.publisher	AAS
dc.relation.ispartof	Australian Acoustical Society Acoustics 2021 Wollongong: Making Waves
dc.relation.ispartof	Australian Acoustical Society Acoustics
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Parametric study of circular duct breakout transmission loss
dc.type	Conference Proceeding
utslib.location.activity	Wollongong
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
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2022-06-01T07:15:04Z
pubs.finish-date	2021-02-23
pubs.place-of-publication	Australia
pubs.publication-status	Published
pubs.start-date	2021-02-21
dc.location	Australia

Abstract:

Breakout from ducts can be a major source of noise on industrial sites. The emitted noise is harmful at sufficient levels and must be reduced. Reducing noise levels using appropriate methods after the fact can be both costly and time consuming. This can be avoided by correctly predicting duct transmission loss before the duct is installed and choosing a suitable construction. In this paper the breakout from circular ducts will be presented as part of a parametric study. Parameters such as duct radius and wall thickness will be used to allow for a suitable choice of duct construction. In practical systems duct radii can be several metres in diameter and this is reflected by the range of the study. The breakout noise is calculated using a semi analytic finite element method. The first step in this method requires determination of the duct's modal properties which is calculated using a numerical eigenvalue analysis. The waves are then propagated along the duct using an analytic expression. A monopole sound source is used to excite the system, simulating the complex acoustic field within HVAC ducts with the transmission loss calculated from the difference between radially propagating sound power to axially propagating sound power.

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http://hdl.handle.net/10453/157867