On the modification of Delany and Bazley fomulae

Kirby, R

On the modification of Delany and Bazley fomulae

Kirby, R

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Publication Type:: Journal Article
Citation:: Applied Acoustics, 2014, 86 pp. 47 - 49
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Kirby, R https://orcid.org/0000-0002-3520-1377	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Applied Acoustics, 2014, 86 pp. 47 - 49	en_US
dc.identifier.issn	0003-682X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/114497
dc.description.abstract	It is well known that the formulae developed by Delany and Bazley for characterising the acoustic properties of porous materials should not be extended to low frequencies. Accordingly, a low frequency correction is required when finding the surface impedance or absorption coefficient of a porous material. This article reviews corrections of a type originally proposed by Miki [J. Acoust. Soc. Japan, 1990;11:19-24] and concludes that there is no physical basis behind these methods and that they should not be used. Instead, a number of alternative methods are available that maintain the correct limiting behaviour for the fundamental properties of a porous material at low frequencies, and two of these methods are briefly reviewed here. © 2014 Elsevier Ltd. All rights reserved.	en_US
dc.relation.ispartof	Applied Acoustics	en_US
dc.relation.isbasedon	10.1016/j.apacoust.2014.04.020	en_US
dc.subject.classification	Acoustics	en_US
dc.title	On the modification of Delany and Bazley fomulae	en_US
dc.type	Journal Article
utslib.citation.volume	86	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	0203 Classical Physics	en_US
utslib.for	1201 Architecture	en_US
pubs.embargo.period	Not known	en_US
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
pubs.publication-status	Published	en_US
pubs.volume	86	en_US

Abstract:

It is well known that the formulae developed by Delany and Bazley for characterising the acoustic properties of porous materials should not be extended to low frequencies. Accordingly, a low frequency correction is required when finding the surface impedance or absorption coefficient of a porous material. This article reviews corrections of a type originally proposed by Miki [J. Acoust. Soc. Japan, 1990;11:19-24] and concludes that there is no physical basis behind these methods and that they should not be used. Instead, a number of alternative methods are available that maintain the correct limiting behaviour for the fundamental properties of a porous material at low frequencies, and two of these methods are briefly reviewed here. © 2014 Elsevier Ltd. All rights reserved.

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http://hdl.handle.net/10453/114497