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http://bura.brunel.ac.uk/handle/2438/9933
Title: | On the modification of Delany and Bazley fomulae |
Authors: | Kirby, R |
Keywords: | Absorption coefficient;Low frequency;Miki method;Surface impedance |
Issue Date: | 2014 |
Publisher: | Elsevier Ltd |
Citation: | Applied Acoustics, 86: 47 - 49, (December 2014) |
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. |
URI: | http://www.sciencedirect.com/science/article/pii/S0003682X14001261 http://bura.brunel.ac.uk/handle/2438/9933 |
DOI: | http://dx.doi.org/10.1016/j.apacoust.2014.04.020 |
ISSN: | 0003-682X |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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