Viscoelastic locally resonant double negative metamaterials with controllable effective density and elasticity
Viscoelastic locally resonant double negative metamaterials with controllable effective density and elasticity
A metamaterial that is composed of solid viscoelastic elements with controllable properties is proposed in this Letter. This enables an adaptable and general acoustic metamaterial to be practically realised. An array of masses with a single elastic connection to a supporting viscoelastic structure, such as one that is dynamically equivalent to an array of Helmholtz resonators, only provides a system with negative effective mass. A local active control scheme applied to each of these masses can emulate additional elastic connections to the supporting structure. An array of masses with a suitable local control scheme can provide both the negative effective stiffness and mass required for negative refraction. The tuneable feedback control parameters determine the characteristics of the region of double negativity.
metamaterial, acoustics, vibration, refractive index, Ddouble negative, active control
4250-4255
Pope, Simon A.
53a06889-86dd-4df2-810d-a09b56aab53e
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6
13 September 2010
Pope, Simon A.
53a06889-86dd-4df2-810d-a09b56aab53e
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6
Pope, Simon A. and Daley, Stephen
(2010)
Viscoelastic locally resonant double negative metamaterials with controllable effective density and elasticity.
Physics Letters A, 41, .
(doi:10.1016/j.physleta.2010.08.037).
Abstract
A metamaterial that is composed of solid viscoelastic elements with controllable properties is proposed in this Letter. This enables an adaptable and general acoustic metamaterial to be practically realised. An array of masses with a single elastic connection to a supporting viscoelastic structure, such as one that is dynamically equivalent to an array of Helmholtz resonators, only provides a system with negative effective mass. A local active control scheme applied to each of these masses can emulate additional elastic connections to the supporting structure. An array of masses with a suitable local control scheme can provide both the negative effective stiffness and mass required for negative refraction. The tuneable feedback control parameters determine the characteristics of the region of double negativity.
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Published date: 13 September 2010
Keywords:
metamaterial, acoustics, vibration, refractive index, Ddouble negative, active control
Organisations:
Signal Processing & Control Grp, Signal Processing & Control Group
Identifiers
Local EPrints ID: 186745
URI: http://eprints.soton.ac.uk/id/eprint/186745
ISSN: 0375-9601
PURE UUID: a6df9bc7-17e3-44fb-80fa-f457d2cff5e0
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Date deposited: 16 May 2011 08:48
Last modified: 14 Mar 2024 03:21
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Author:
Simon A. Pope
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