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Non-singular three-dimensional arbitrarily shaped acoustic cloaks composed of homogeneous parts

Li, Q and Vipperman, JS (2018) Non-singular three-dimensional arbitrarily shaped acoustic cloaks composed of homogeneous parts. Journal of Applied Physics, 124 (3). ISSN 0021-8979

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Abstract

© 2018 Author(s). Acoustic metamaterials are artificial materials with unique acoustic properties, permitting interesting behaviors, such as acoustic cloaking. Acoustic cloaks can make an object appear acoustically “invisible.” Prior cloaks that were designed based on transformation methods have been limited by inhomogeneous, anisotropic, and extreme material parameters. In this paper, a multistep transformation is proposed for a general tetrahedron. Each tetrahedron contains three homogeneous parts. Since most cloaks can be approximated as polyhedra, they can be divided into a series of tetrahedra. As a result, most of the 3D cloaks can be constructed of homogeneous parts by first approximating them as polyhedra. Two examples of the polyhedral cloaks are given, which are simulated using COMSOL Multiphysics finite element software. The results show that the cloaks work well at acoustically concealing 3D objects. Although the properties of each part are non-singular, a balance is still required between cloaking performance and moderation of the material property values.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Li, Q
Vipperman, JSjsv@pitt.eduJSV0000-0001-5585-954X
Date: 21 July 2018
Date Type: Publication
Journal or Publication Title: Journal of Applied Physics
Volume: 124
Number: 3
DOI or Unique Handle: 10.1063/1.5028136
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 0021-8979
Date Deposited: 20 Sep 2018 14:33
Last Modified: 20 Sep 2018 16:55
URI: http://d-scholarship.pitt.edu/id/eprint/35325

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