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Two-dimensional arbitrarily shaped acoustic cloaks composed of homogeneous parts

Li, Q and Vipperman, JS (2017) Two-dimensional arbitrarily shaped acoustic cloaks composed of homogeneous parts. Journal of Applied Physics, 122 (14). ISSN 0021-8979

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Abstract

© 2017 Author(s). Acoustic cloaking is an important application of acoustic metamaterials. Although the topic has received much attention, there are a number of areas where contributions are needed. In this paper, a design method for producing acoustic cloaks with arbitrary shapes that are composed of homogeneous parts is presented. The cloak is divided into sections, each of which, in turn, is further divided into two parts, followed by the application of transformation acoustics to derive the required properties for cloaking. With the proposed mapping relations, the properties of each part of the cloak are anisotropic but homogeneous, which can be realized using two alternating layers of homogeneous and isotropic materials. A hexagonal and an irregular cloak are presented as design examples. The full wave simulations using COMSOL Multiphysics finite element software show that the cloaks function well at reducing reflections and shadows. The variation of the cloak properties is investigated as a function of three important geometric parameters used in the transformations. A balance can be found between cloaking performance and materials properties that are physically realizable.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Li, Q
Vipperman, JSjsv@pitt.eduJSV0000-0001-5585-954X
Date: 14 October 2017
Date Type: Publication
Journal or Publication Title: Journal of Applied Physics
Volume: 122
Number: 14
DOI or Unique Handle: 10.1063/1.4990758
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 0021-8979
Date Deposited: 21 Sep 2018 19:13
Last Modified: 22 Jan 2019 20:55
URI: http://d-scholarship.pitt.edu/id/eprint/35332

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