Numerical modelling of the sound absorption spectra for bottleneck dominated porous metallic structures

Otaru, A.J. and Morvan, H.P. and Kennedy, A.R. (2019) Numerical modelling of the sound absorption spectra for bottleneck dominated porous metallic structures. Applied Acoustics, 151. pp. 164-171. ISSN 0003-682X

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Abstract

Numerical simulations are used to test the ability of several common equivalent fluid models to predict the sound absorption behaviour in porous metals with “bottleneck” type structures. Of these models, Wilson's relaxation model was found to be an excellent and overall best fit for multiple sources of experimental acoustic absorption data. Simulations, incorporating Wilson's model, were used to highlight the relative importance of key geometrical features of bottleneck structures on the normal incidence sound absorption spectrum. Simulations revealed significant improvements in absorption behaviour would be achieved, over a “benchmark” structure from the literature, by maximising the porosity (0.8) and targeting a permeability in the range of 4.0 × 10 −10 m 2 . Such a modelling approach should provide a valuable tool in the optimisation of sound absorption performance and structural integrity, to meet application-specific requirements, for a genre of porous materials that offer a unique combination of acoustic absorption and load bearing capability.

Item Type:
Journal Article
Journal or Publication Title:
Applied Acoustics
Additional Information:
This is the author’s version of a work that was accepted for publication in Applied Acoustics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Acoustics, 151, 2019 DOI: 10.1016/j.apacoust.2019.03.014
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3102
Subjects:
ID Code:
132143
Deposited By:
Deposited On:
22 Mar 2019 13:50
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Sep 2020 05:10