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Feedforward control of sound transmission using an active acoustic metamaterial

Feedforward control of sound transmission using an active acoustic metamaterial
Feedforward control of sound transmission using an active acoustic metamaterial
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 regions 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 wave- length 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 compared to traditional passive control treatments, however, due to their resonant behaviour, the band gaps tend to occur over a relatively narrow frequency range. A similar long wavelength performance advantage can be achieved using active noise control, but the systems in this case do not rely on resonant behaviour. This paper demonstrates how the performance of an acoustic metamaterial, consisting of an array of Helmholtz resonators, can be significantly enhanced by the integration of an active control mechanism that is facilitated by embedding loudspeakers into the resonators. Crucially, it is then also shown how the active acoustic metamaterial significantly out- performs an equivalent traditional active noise control system. In both cases a broadband feedforward control strategy is employed to minimise the trans- mitted pressure in a one dimensional acoustic control problem and a new method of weighting the control effort over a targeted frequency range is described.
1-24
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6
McCormick, Cameron
8f75f921-7c18-4103-b2ad-45231bffb83c
Cheer, Jordan
8e452f50-4c7d-4d4e-913a-34015e99b9dc
Daley, Stephen
53cef7f1-77fa-4a4c-9745-b6a0ba4f42e6
McCormick, Cameron
8f75f921-7c18-4103-b2ad-45231bffb83c

Cheer, Jordan, Daley, Stephen and McCormick, Cameron (2017) Feedforward control of sound transmission using an active acoustic metamaterial. Smart Materials and Structures, 26 (2), 1-24. (doi:10.1088/1361-665X/aa52fb).

Record type: Article

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 regions 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 wave- length 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 compared to traditional passive control treatments, however, due to their resonant behaviour, the band gaps tend to occur over a relatively narrow frequency range. A similar long wavelength performance advantage can be achieved using active noise control, but the systems in this case do not rely on resonant behaviour. This paper demonstrates how the performance of an acoustic metamaterial, consisting of an array of Helmholtz resonators, can be significantly enhanced by the integration of an active control mechanism that is facilitated by embedding loudspeakers into the resonators. Crucially, it is then also shown how the active acoustic metamaterial significantly out- performs an equivalent traditional active noise control system. In both cases a broadband feedforward control strategy is employed to minimise the trans- mitted pressure in a one dimensional acoustic control problem and a new method of weighting the control effort over a targeted frequency range is described.

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Feedforward_Active_Acoustic_MM.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 9 December 2016
e-pub ahead of print date: 24 January 2017
Published date: 24 January 2017
Organisations: Signal Processing & Control Grp

Identifiers

Local EPrints ID: 403870
URI: https://eprints.soton.ac.uk/id/eprint/403870
PURE UUID: 119c51ce-c886-45c4-b1d9-e9eb03aa4e59
ORCID for Jordan Cheer: ORCID iD orcid.org/0000-0002-0552-5506

Catalogue record

Date deposited: 15 Dec 2016 10:38
Last modified: 06 Jun 2018 12:32

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Contributors

Author: Jordan Cheer ORCID iD
Author: Stephen Daley
Author: Cameron McCormick

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