4.7 Article

Perforated panel absorbers with micro-perforated partitions

Journal

APPLIED ACOUSTICS
Volume 149, Issue -, Pages 108-113

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2019.01.023

Keywords

Perforated panel absorber; Micro-perforated partitions; Sound absorption; Equivalent Circuit Method

Categories

Funding

  1. COST (European Cooperation in Science and Technology) through the COST Action [CA15125]
  2. FEDER funds through the Regional Operational Programme CENTRO2020 [CENTRO-01-0247-FEDER-033884]
  3. FEDER funds through the Competitivity Factors Operational Programme - COMPETE
  4. FCT - Foundation for Science and Technology [POCI-01-0145-FEDER-007633]

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Some of the most extended approaches to widen the sound absorption bandwidth of perforated panel absorbers are the use of different cavity depths or multi-layer arrangements. Unfortunately, these solutions are rarely adopted in practice because of the technical installation difficulties or the large space requirements. This work explores an alternative compact solution consisting of a multi-size perforated panel absorber with micro-perforated partitioned cavities. While multi-size perforated panel absorbers with rigidly partitioned cavities show a wider sound absorption effective bandwidth when compared to those using single sized holes (i. e. multiple resonances instead of single resonance), the use of micro-perforated partitions was found to further broaden it and hence improve their sound absorption performance. A simplified approximate model for the prediction of the acoustic properties of such devices was derived using the Equivalent Circuit Method (ECM) and the Maa model for MPPs (Micro-Perforated Panels). Results in terms of the sound absorption coefficient under normal incidence showed a good agreement when compared to finite element simulations both for the cases with rigid and micro-perforated partitions. In addition, a parametric study was found very helpful to understand the influence of the geometrical features of the micro-perforated partitions on the acoustic behavior of the resonator, thus being useful for its design and analysis. (C) 2019 Elsevier Ltd. All rights reserved.

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