The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation

Abstract Transformation acoustics, as an unconventional theory, provides a powerful tool to design various kinds of acoustic devices with excellent functionalities. However, the required ideal parameters, which are prescribed by the method, are both complex and hard to implement-even using acoustic...

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Autores principales:	Jun Cao, Fenghua Qi, Senlin Yan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a23074ea71484793859ff818e8719749
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spelling	oai:doaj.org-article:a23074ea71484793859ff818e87197492021-12-02T15:23:04ZThe required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation10.1038/s41598-020-79728-72045-2322https://doaj.org/article/a23074ea71484793859ff818e87197492021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79728-7https://doaj.org/toc/2045-2322Abstract Transformation acoustics, as an unconventional theory, provides a powerful tool to design various kinds of acoustic devices with excellent functionalities. However, the required ideal parameters, which are prescribed by the method, are both complex and hard to implement-even using acoustic metamaterials. Furthermore, simplified parameter materials are generally favored in transformation-acoustic design due to its easier realization with artificial structures. In this letter, we propose a coordinate transformation methodology for achieving simplified parameters by tuning the impedance distribution in the geometric limit, where the transformation media parameters can be derived by setting tunable impedance functions in the original space and a combination of suitable linear or nonlinear coordinate transformation. Based on this approach, both two-dimensional acoustic cloak and concentrators are designed with different sets of simplified parameters. Numerical simulations indicate good performance of these devices with minimized scattering at higher frequencies. The proposed method provides more opportunities to realize the designed acoustic devices experimentally, and can also be used for other transformation-acoustic designs including 3D cases.Jun CaoFenghua QiSenlin YanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jun Cao Fenghua Qi Senlin Yan The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation
description	Abstract Transformation acoustics, as an unconventional theory, provides a powerful tool to design various kinds of acoustic devices with excellent functionalities. However, the required ideal parameters, which are prescribed by the method, are both complex and hard to implement-even using acoustic metamaterials. Furthermore, simplified parameter materials are generally favored in transformation-acoustic design due to its easier realization with artificial structures. In this letter, we propose a coordinate transformation methodology for achieving simplified parameters by tuning the impedance distribution in the geometric limit, where the transformation media parameters can be derived by setting tunable impedance functions in the original space and a combination of suitable linear or nonlinear coordinate transformation. Based on this approach, both two-dimensional acoustic cloak and concentrators are designed with different sets of simplified parameters. Numerical simulations indicate good performance of these devices with minimized scattering at higher frequencies. The proposed method provides more opportunities to realize the designed acoustic devices experimentally, and can also be used for other transformation-acoustic designs including 3D cases.
format	article
author	Jun Cao Fenghua Qi Senlin Yan
author_facet	Jun Cao Fenghua Qi Senlin Yan
author_sort	Jun Cao
title	The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation
title_short	The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation
title_full	The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation
title_fullStr	The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation
title_full_unstemmed	The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation
title_sort	required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a23074ea71484793859ff818e8719749
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The required acoustic parameters simplification of invisibility cloaks and concentrators using the impedance-tunable coordinate transformation

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