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An active acoustic metamaterial for the control of sound transmission

An active acoustic metamaterial for the control of sound transmission
An active acoustic metamaterial for the control of sound transmission
Metamaterials have received significant interest in recent years due to their potential ability to exhibit behaviour not found in naturally occurring materials. This includes the generation of band gaps, which are frequency ranges with high levels of wave attenuation. In the context of acoustics, these band gaps can be tuned to occur at low frequencies where the acoustic wavelength is large compared to the material, and where the performance of traditional passive noise control treatments is limited. Therefore, such acoustic metamaterials have been shown to offer a significant performance advantage, however, due to their resonant behaviour, the band gaps tend to occur over a relatively narrow frequency range. Previous work has demonstrated that a significant increase in performance can be achieved by incorporating active control elements into acoustic metamaterials. This paper demonstrates how the performance of an acoustic metamaterial, consisting of an array of Helmholtz resonators, can be significantly enhanced through active control. Loudspeakers are embedded into the resonators and these are driven via a fixed broadband feedforward control scheme to minimise the transmitted pressure. It is demonstrated that by incorporating the active mechanism into the acoustic metamaterial a significant enhancement in the transmission loss is achieved.
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
McCormick, Cameron
8f75f921-7c18-4103-b2ad-45231bffb83c
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
McCormick, Cameron
8f75f921-7c18-4103-b2ad-45231bffb83c
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6

Cheer, Jordan, McCormick, Cameron and Daley, Stephen (2016) An active acoustic metamaterial for the control of sound transmission. 23rd International Congress on Sound & Vibration, Athens, Greece. 10 - 14 Jul 2016. 8 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Metamaterials have received significant interest in recent years due to their potential ability to exhibit behaviour not found in naturally occurring materials. This includes the generation of band gaps, which are frequency ranges with high levels of wave attenuation. In the context of acoustics, these band gaps can be tuned to occur at low frequencies where the acoustic wavelength is large compared to the material, and where the performance of traditional passive noise control treatments is limited. Therefore, such acoustic metamaterials have been shown to offer a significant performance advantage, however, due to their resonant behaviour, the band gaps tend to occur over a relatively narrow frequency range. Previous work has demonstrated that a significant increase in performance can be achieved by incorporating active control elements into acoustic metamaterials. This paper demonstrates how the performance of an acoustic metamaterial, consisting of an array of Helmholtz resonators, can be significantly enhanced through active control. Loudspeakers are embedded into the resonators and these are driven via a fixed broadband feedforward control scheme to minimise the transmitted pressure. It is demonstrated that by incorporating the active mechanism into the acoustic metamaterial a significant enhancement in the transmission loss is achieved.

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More information

e-pub ahead of print date: 11 July 2016
Venue - Dates: 23rd International Congress on Sound & Vibration, Athens, Greece, 2016-07-10 - 2016-07-14
Organisations: Signal Processing & Control Grp

Identifiers

Local EPrints ID: 398443
URI: https://eprints.soton.ac.uk/id/eprint/398443
PURE UUID: 530d1fb4-b627-46d3-8c18-8135286a9eea
ORCID for Jordan Cheer: ORCID iD orcid.org/0000-0002-0552-5506

Catalogue record

Date deposited: 26 Jul 2016 10:33
Last modified: 14 Dec 2018 01:32

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