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Sustainability 2016, 8(2), 107; doi:10.3390/su8020107

Sustainable Acoustic Metasurfaces for Sound Control

1
Department of Engineering, University of Roma TRE, Via Vito Volterra 62, Rome 00146, Italy
2
Department of Engineering, Niccolò Cusano University, Via Don Carlo Gnocchi 3, Rome 00166, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Francesco Asdrubali and Pietro Buzzini
Received: 27 October 2015 / Revised: 5 January 2016 / Accepted: 15 January 2016 / Published: 22 January 2016
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Abstract

Sound attenuation with conventional acoustic materials is subject to the mass law and requires massive and bulky structures at low frequencies. A possible alternative solution is provided by the use of metamaterials, which are artificial materials properly engineered to obtain properties and characteristics that it is not possible to find in natural materials. Theory and applications of metamaterials, already consolidated in electromagnetism, can be extended to acoustics; in particular, they can be applied to improve the properties of acoustical panels. The design of acoustic metasurfaces that could effectively control transmitted sound in unconventional ways appears a significant subject to be investigated, given its wide-ranging possible applications. In this contribution, we investigate the application of a metasurface-inspired technique to achieve the acoustical insulation of an environment. The designed surface has subwavelength thickness and structuring and could be realized with cheap, lightweight and sustainable materials. We present a few examples of such structures and analyze their acoustical behavior by means of full-wave simulations. View Full-Text
Keywords: noise reduction; transmission coefficient; reflection coefficient; acoustic metamaterials; full wave simulations noise reduction; transmission coefficient; reflection coefficient; acoustic metamaterials; full wave simulations
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gori, P.; Guattari, C.; Asdrubali, F.; de Lieto Vollaro, R.; Monti, A.; Ramaccia, D.; Bilotti, F.; Toscano, A. Sustainable Acoustic Metasurfaces for Sound Control. Sustainability 2016, 8, 107.

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