Acoustic carpet invisibility cloak with two open windows using multilayered homogeneous isotropic material |
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Authors: | Ren Chun-Yu Xiang Zhi-Hai Cen Zhang-Zhi |
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Affiliation: | Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China; Department of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430033, China |
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Abstract: | We present a method for designing an open acoustic cloak that can conceal a perturbation on flat ground and simultaneously meet the requirement of communication and matter interchange between the inside and the outside of the cloak. This cloak can be constructed with a multilayered structure and each layer is an isotropic and homogeneous medium. The design scheme consists of two steps: firstly, we apply a conformal coordinate transformation to obtain a quasi-perfect cloak with heterogeneous isotropic material; then, according to the profile of the material distribution, we degenerate this cloak into a multilayered-homogeneous isotropic cloak, which has two open windows with negligible disturbance on its invisibility performance. This may greatly facilitate the fabrication and enhance the applicability of such a carpet-type cloak. |
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Keywords: | transformation method acoustic wave carpet cloak multilayered structure |
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