Rights statement: 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
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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Numerical modelling of the sound absorption spectra for bottleneck dominated porous metallic structures
AU - Otaru, A.J.
AU - Morvan, H.P.
AU - Kennedy, A.R.
N1 - 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
PY - 2019/8/1
Y1 - 2019/8/1
N2 - 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.
AB - 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.
KW - Porous metal
KW - Simulation
KW - Sound absorption
KW - Absorption spectroscopy
KW - Electromagnetic wave absorption
KW - Numerical models
KW - Porous materials
KW - Sound insulating materials
KW - Acoustic absorption
KW - Application specific requirements
KW - Geometrical features
KW - Load bearing capabilities
KW - Metallic structures
KW - Acoustic wave absorption
U2 - 10.1016/j.apacoust.2019.03.014
DO - 10.1016/j.apacoust.2019.03.014
M3 - Journal article
VL - 151
SP - 164
EP - 171
JO - Applied Acoustics
JF - Applied Acoustics
SN - 0003-682X
ER -