Metamaterials are artificial materials properly engineered to obtain properties and characteristics that are not possible to find in natural materials. Theory and applications of metamaterials, already consolidated in electromagnetism, have been extended to acoustics, in particular, they can be applied to improve properties of acoustical panels and absorbers. In this frame, acoustic cloaking technique is an actively investigated subject given its wide-ranging possible applications. In this contribution we investigate the application of the so-called mantle cloaking technique to the environmental acoustical problems. We propose an innovative way to achieve the acoustical insulation of a confined environment, aiming to lower noise pollution, by designing a subwavelength-thick surface with proper surface acoustic impedance. This solution would require panels with lower mass and thickness compared with the conventional ones. We present a few models of simple structures designed to obtain sound control and test their behavior by means of full-wave simulations.

Gori P, Guattari C, Asdrubali F, de Lieto Vollaro R, Monti A, Ramaccia D, et al. (2015). Acoustic Metasurfaces for Sound Control. In PROCEEDINGS of 15th CIRIAF National Congress Environmental Footprint and Sustainable Development.

Acoustic Metasurfaces for Sound Control

GORI, Paola;GUATTARI, MARIA CLAUDIA;ASDRUBALI, Francesco;DE LIETO VOLLARO, ROBERTO;Monti A;RAMACCIA, DAVIDE;BILOTTI, FILIBERTO;TOSCANO, ALESSANDRO
2015

Abstract

Metamaterials are artificial materials properly engineered to obtain properties and characteristics that are not possible to find in natural materials. Theory and applications of metamaterials, already consolidated in electromagnetism, have been extended to acoustics, in particular, they can be applied to improve properties of acoustical panels and absorbers. In this frame, acoustic cloaking technique is an actively investigated subject given its wide-ranging possible applications. In this contribution we investigate the application of the so-called mantle cloaking technique to the environmental acoustical problems. We propose an innovative way to achieve the acoustical insulation of a confined environment, aiming to lower noise pollution, by designing a subwavelength-thick surface with proper surface acoustic impedance. This solution would require panels with lower mass and thickness compared with the conventional ones. We present a few models of simple structures designed to obtain sound control and test their behavior by means of full-wave simulations.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/173543
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