Numerical method for prediction of duct break out sound power

Williams, P; Kirby, R; Hill, J

Numerical method for prediction of duct break out sound power

Williams, P Kirby, R

Hill, J

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Publisher:: ASA
Publication Type:: Conference Proceeding
Citation:: Proceedings of Meetings on Acoustics, 2019, 39, (1), pp. 022001
Issue Date:: 2019-01-01

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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	Hill, J
dc.date.accessioned	2021-04-07T09:53:02Z
dc.date.available	2021-04-07T09:53:02Z
dc.date.issued	2019-01-01
dc.identifier.citation	Proceedings of Meetings on Acoustics, 2019, 39, (1), pp. 022001
dc.identifier.issn	1939-800X
dc.identifier.uri	http://hdl.handle.net/10453/147870
dc.description.abstract	The acoustic design of duct systems requires consideration of both the noise propagating within a duct and also of the noise transmitted out through the duct walls into the environment. Control of this breakout noise can form a significant part of a noise control solution, and so understanding this phenomenon can lead to reduced material use. The breakout noise is investigated here using coupled structural-acoustic finite element models. Propagation along a waveguide with constant cross section is represented using a modal expansion of the acoustic pressure in the fluid and displacement in the duct walls. The free-field external environment requires an outer boundary condition, and for this purpose, a perfectly matched layer is applied at some distance from the elastic walls. The finite length of the waveguide is then enforced by coupling the fields to separate infinite length inlet and outlet ducts by the mode matching method. Transmitted power from the finite length duct is investigated when a noise source is placed in the inlet.
dc.language	en
dc.publisher	ASA
dc.relation	http://purl.org/au-research/grants/arc/LP170100881
dc.relation.ispartof	Proceedings of Meetings on Acoustics
dc.relation.ispartof	178th Meeting of the Acoustical Society of America
dc.relation.isbasedon	10.1121/2.0001205
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Numerical method for prediction of duct break out sound power
dc.type	Conference Proceeding
utslib.citation.volume	39
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	open_access	*
dc.date.updated	2021-04-07T09:52:59Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	39
utslib.citation.issue	1

Abstract:

The acoustic design of duct systems requires consideration of both the noise propagating within a duct and also of the noise transmitted out through the duct walls into the environment. Control of this breakout noise can form a significant part of a noise control solution, and so understanding this phenomenon can lead to reduced material use. The breakout noise is investigated here using coupled structural-acoustic finite element models. Propagation along a waveguide with constant cross section is represented using a modal expansion of the acoustic pressure in the fluid and displacement in the duct walls. The free-field external environment requires an outer boundary condition, and for this purpose, a perfectly matched layer is applied at some distance from the elastic walls. The finite length of the waveguide is then enforced by coupling the fields to separate infinite length inlet and outlet ducts by the mode matching method. Transmitted power from the finite length duct is investigated when a noise source is placed in the inlet.

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http://hdl.handle.net/10453/147870