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Resonant Acoustic Metamaterials

Department of Architecture and Industrial Design, University of Campania “Luigi Vanvitelli”, 81031 Aversa, Italy
SCS-ControlSys—Vibro-Acoustic, 35011 Padova, Italy
Department of Architecture and Engineering, University of Parma, 43124 Parma, Italy
Energy Department, Politecnico di Milano, 20133 Milano, Italy
Author to whom correspondence should be addressed.
Appl. Sci. 2024, 14(12), 5080;
Submission received: 9 May 2024 / Revised: 2 June 2024 / Accepted: 8 June 2024 / Published: 11 June 2024


Acoustic applications of metamaterials have rapidly developed over the past few decades. The sound attenuation provided by metamaterials is due to the interaction between soundwaves and scatterers organized into a reticular grid, with a peak attenuation at a specific frequency band that is highly dependent on the scatterers’ diameter and reticular geometric organization of installation. In this article, the scatterer types chosen for the experiments are represented by a 2D shape, which are cylindrical solid-wood bars of 15 mm diameter and empty cylindrical bars of 20 mm diameter. Acoustic measurements were conducted in a semi-anechoic chamber to identify the specific frequency at which the highest insertion loss (IL) was registered. A second experiment was conducted by creating holes of 5 mm diameter on the external surface of the empty bars; in this way, it registered a higher sound attenuation. In particular, the resonant system characterized with holes, in combination with the attenuation given by 2D scatterer metamaterials, increased the sound attenuation for the frequency range between 1 kHz and 10 kHz.
Keywords: metamaterials; insertion loss; scale model; noise attenuation; diffraction; 2D scatterers metamaterials; insertion loss; scale model; noise attenuation; diffraction; 2D scatterers

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MDPI and ACS Style

Iannace, G.; Amadasi, G.; Bevilacqua, A.; Cairoli, M.; Trematerra, A. Resonant Acoustic Metamaterials. Appl. Sci. 2024, 14, 5080.

AMA Style

Iannace G, Amadasi G, Bevilacqua A, Cairoli M, Trematerra A. Resonant Acoustic Metamaterials. Applied Sciences. 2024; 14(12):5080.

Chicago/Turabian Style

Iannace, Gino, Giovanni Amadasi, Antonella Bevilacqua, Maria Cairoli, and Amelia Trematerra. 2024. "Resonant Acoustic Metamaterials" Applied Sciences 14, no. 12: 5080.

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