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Sustainability 2014, 6(7), 4416-4425;

Robustness of Acoustic Scattering Cancellation to Parameter Variations

Department of Engineering, Roma TRE University, Mechanical and Industrial Engineering Section, Via della Vasca Navale 79, 00146 Rome, Italy
Department of Engineering, Roma TRE University, Applied Electronics Section, Via Vito Volterra 62, 00146 Rome, Italy
Author to whom correspondence should be addressed.
Received: 10 June 2014 / Revised: 7 July 2014 / Accepted: 7 July 2014 / Published: 16 July 2014
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This contribution aims at investigating the possibility to cloak a spherical object from an acoustic wave by applying the scattering cancellation approach. In electromagnetism, the scattering problem is treated using the Mie expansion technique, through which the scattered field by a spherical object can be represented as a superposition of TE and TM spherical harmonics. It is possible to extend this concept to the acoustic field by defining an analogous approach; the pressure field, generated by an elastic wave impinging on a spherical object, can be expressed applying the Mie expansion technique, as well. In acoustics, to achieve scattering suppression at a given frequency, the constitutive parameters to control are density and compressibility. By varying these parameter values, it is possible to define an engineered material with anomalous properties, which cannot be found in nature, able to reduce the scattering cross-section (SCS) from a spherical object. We propose a study about the effectiveness of the SCS reduction from an elastic sphere coated with a properly-designed acoustic metamaterial. The sensitivity of the SCS to parameter variations is analyzed for different coating thicknesses and sphere dimensions. Our analysis is supported by both the analytical modelling of the structure and numerical simulations. View Full-Text
Keywords: acoustic metamaterial; scattering cancellation; Mie scattering; acoustic cloaking acoustic metamaterial; scattering cancellation; Mie scattering; acoustic cloaking

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Guattari, C.; Gori, P.; de Lieto Vollaro, R.; Evangelisti, L.; Battista, G.; Basilicata, C.; Toscano, A.; Bilotti, F. Robustness of Acoustic Scattering Cancellation to Parameter Variations. Sustainability 2014, 6, 4416-4425.

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