Concentrating and black hole like structures by elastic metamaterials with acoustic cavities under active feedback control

In the underwater sonar or similar devices where the high pressure field is required, the concentrating and black hole like structures have important applications in harvesting energy systems of elastic waves. In this work, a new kind of active elastic metamaterials with cavities and an acoustic con...

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Bibliographic Details
Published inWaves in random and complex media Vol. 32; no. 1; pp. 155 - 173
Main Authors Ning, Li, Wang, Yi-Ze, Wang, Yue-Sheng
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 02.01.2022
Taylor & Francis Ltd
Subjects
acoustic concentrators
Acoustic waves
Acoustics
Active control
Active feedback control
black hole like properties
Black holes
Bulk density
Bulk modulus
Concentrators
Control systems
Coordinate transformations
Diaphragms
effective material parameters
elastic metamaterials
Elastic waves
Energy harvesting
Feedback control
Frequency ranges
Metamaterials
Piezoelectricity
Underwater acoustics
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Summary:In the underwater sonar or similar devices where the high pressure field is required, the concentrating and black hole like structures have important applications in harvesting energy systems of elastic waves. In this work, a new kind of active elastic metamaterials with cavities and an acoustic concentrator are presented. By the feedback control gain of piezoelectric diaphragms, we can obtain both the controllable effective bulk modulus and density within a wide frequency range. Based on the coordinate transformation method and by the feedback control on the periodic arrangement of acoustic cavities, an acoustic concentrator with multilayered alternative homogeneous materials can be achieved. Numerical results show that the acoustic wave is perfectly limited within the core region of the concentrator, which can enhance the acoustic energy. These characteristics with the tunable effective bulk modulus and density within a very wide frequency range are expected to be helpful for the design of practical acoustic concentrators.
ISSN:1745-5030
1745-5049
DOI:10.1080/17455030.2020.1767318