Macro- and micro-structure designs for porous sound absorbers

Attenborough, Keith (2019). Macro- and micro-structure designs for porous sound absorbers. Applied Acoustics, 145 pp. 349–357.

DOI: https://doi.org/10.1016/j.apacoust.2018.10.018

Abstract

Macro-structures that improve the sound absorption of hard-backed layers of rigid-porous material include graduated arrangements for obtaining impedance matching and vertical and horizontal partitioning which can result in meta-material behaviour. Instead of using bulk manufactured porous materials as the host media, normal incidence absorption coefficient spectra are predicted for combinations of these macro-structures with simple micro-structures consisting of uniform or non-uniform slits either normal or inclined to the layer surface. The results suggest that, subject to manufacturing constraints, the production of composite structures like these instead of traditional porous sound absorbing configurations would result in comparable or superior acoustical performances.

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