Journal
APPLIED ACOUSTICS
Volume 184, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2021.108341
Keywords
Helmholtz resonator; Transfer matrix; Electro-acoustic analogy; Room acoustics; Sound absorption coefficient; Reverberation room
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Funding
- Brno University of Technology [FASTJ-20-6458]
- Technological Agency of the Czech Republic within the programme EPSILON [TH04020263]
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The article focuses on an optimized method for Helmholtz resonators (HR) design in room acoustics. An experiment in a reverberation room was conducted to verify calculation methods for sound absorption coefficient, and the calculation was optimized to better match the measurements.
The article focuses on an optimized method for Helmholtz resonators (HR) design to be used in room acoustics. They are resonators in the form of acoustic wall facings and ceilings formed by perforated boards with circular apertures. In order to verify available calculation methods for sound absorption coefficient, an experiment was performed in a reverberation room. Several variants of the internal absorbent and internal arrangement of the HR cavity for the experiment were measured. The measured data were compared with two available methods of sound absorption coefficient calculation for normal incidence using a 1D transfer matrix and electro-acoustic analogy. The calculation optimization was performed with the use of the measured data with the aim to reach better conformity of calculated courses of the sound absorption coefficient and the reverberation room measurements. (C) 2021 Elsevier Ltd. All rights reserved.
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