Improving the performance of acoustic invisibility with multilayer structure based on scattering analysis

In this paper, acoustic scattering from the system comprised of a cloaked object and the multilayer cloak with only one single pair of isotropic media is analyzed with a recursive numerical method. The designed acoustic parameters of the isotropic cloak media are assumed to be single-negative, and t...

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Bibliographic Details
Published inChinese physics B Vol. 25; no. 12; pp. 9 - 16
Main Author 蔡琛 袁樱 阚威威 杨京 邹欣晔
Format Journal Article
LanguageEnglish
Published 01.12.2016
Subjects
各向同性介质
声传感器
声学参数
声散射
声隐身
多层结构
性能改善
数值分析方法
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/25/12/124302

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Summary:In this paper, acoustic scattering from the system comprised of a cloaked object and the multilayer cloak with only one single pair of isotropic media is analyzed with a recursive numerical method. The designed acoustic parameters of the isotropic cloak media are assumed to be single-negative, and the resulting cloak can reduce acoustic scattering from an acoustic sensor while allowing it to receive external information. Several factors that may influence the performance of the cloak, including the number of layers and the acoustic dissipation of the medium are fully analyzed. Furthermore, the possibility of achieving acoustic invisibility with positive acoustic parameters is proposed by searching the optimum value in the parameter space and minimizing the scattering cross-section.
Bibliography:Chen Cai, Yin Yuan, Wei-Wei Kan, Jing Yang, and Xin-Ye Zou（1 Key Laboratory of Modern Acoustics, MOE, and Institute of Acoustics, Department of Physics, Nanjing University, Nanjing 210093, China 2 The School of Mathematics and Physics, Jiangsu University of Technology, Changzhou 213001, China 3 School of Science, Nanjing University of Science and Technology, Nanjing 210094, China）
metamaterials, acoustic cloaking, scattering, invisibility
In this paper, acoustic scattering from the system comprised of a cloaked object and the multilayer cloak with only one single pair of isotropic media is analyzed with a recursive numerical method. The designed acoustic parameters of the isotropic cloak media are assumed to be single-negative, and the resulting cloak can reduce acoustic scattering from an acoustic sensor while allowing it to receive external information. Several factors that may influence the performance of the cloak, including the number of layers and the acoustic dissipation of the medium are fully analyzed. Furthermore, the possibility of achieving acoustic invisibility with positive acoustic parameters is proposed by searching the optimum value in the parameter space and minimizing the scattering cross-section.
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/25/12/124302