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Active Acoustic Cloaking Spherical Shells

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The scheme of efficient and practical directional active acoustic cloaking is proposed in contrast to the attractive though hard to utilize concept of passive acoustic cloaking which is based on composite acoustic metamaterials or negative index materials. In this paper, the scattering cancellation is planned to occur in a desired direction such as backscattering in far-field, with great interests in SONAR (Sound Navigation and Ranging) applications. The invisibility of the target object/region occurs due to a surrounding spherical cloaking shell composed of a casing layer stimulated by a radially polarized piezoelectric bonded layer. With concerns regarding the feasibility of the proposed configuration, the electrical excitation is limited only to its monopole mode (breathing mode). An illustrative numerical example is presented in order to investigate the practicability of the configuration especially with emphasis on required voltage and power supply.
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Document Type: Research Article

Publication date: January 1, 2018

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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