Sound diffuser made of acoustic metamaterial: numerical and experimental investigation

• Autorzy: Rubacha Jarosław

Identyfikatory

DOI

10.21008/j.0860-6897.2021.2.07

• Języki publikacji: EN

Abstrakty

EN

The use of metamaterials in room acoustics is becoming more and more popular. Their advantage is the possibility of adjusting the parameters of the systems in the desired frequency range and the reduction of dimensions compared to the existing solutions. This paper discusses the numerical design and experimental verification of sound diffuser based on the acoustic metamaterials: a slit with added quart-wave length resonator. The transfer matrix method is used to make a numerical model of the metamaterial cell, which was used to build a model of a diffuser composed of N = 7 cells. Then, the dimensions of the diffuser were optimized to obtain the sound diffusion in a wide frequency range. The sound dispersion coefficient was also calculated using the FEM method. The numerical results were compared with the measurements and it was shown that it is possible to make a broadband sound diffuser with the use of metamaterials.

Słowa kluczowe

EN

metamaterial; sound diffusion; diffusion coefficient

PL

metamateriał; dyfuzja dźwięku; współczynnik dyfuzji

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2021
• Tom: Vol. 32, nr 2
• Strony: art. no. 2021207
• Opis fizyczny: Bibliogr. 12 poz., 1 fot., rys., wykr.

Twórcy

autor

Rubacha Jarosław

• AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

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• 6. doi: 10.1121/1.4945101.
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• 9. N. Jiménez, W. Huang, V. Romero-García, V. Pagneux, J.-P. Groby. Ultra-thin metamaterial for perfect and quasi-omnidirectional sound absorption. Applied Physics Letters, 109:121902, 2016.
• 10. M.L. Munjal. Acoustics of Ducts and Mufflers. Wiley, Chichester, 2014.
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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).