Tunable and broadband asymmetric sound absorptions with coupling of acoustic bright and dark modes

Long, H; Liu, C; Shao, C; Cheng, Y; Tao, J; Qiu, X; Liu, X

Tunable and broadband asymmetric sound absorptions with coupling of acoustic bright and dark modes

Long, H Liu, C Shao, C Cheng, Y Tao, J Qiu, X

Liu, X

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Publisher:: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: Journal of Sound and Vibration, 2020, 479
Issue Date:: 2020-08-04

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Field	Value	Language
dc.contributor.author	Long, H
dc.contributor.author	Liu, C
dc.contributor.author	Shao, C
dc.contributor.author	Cheng, Y
dc.contributor.author	Tao, J
dc.contributor.author	Qiu, X https://orcid.org/0000-0002-5181-1220
dc.contributor.author	Liu, X
dc.date.accessioned	2021-02-09T05:17:18Z
dc.date.available	2021-02-09T05:17:18Z
dc.date.issued	2020-08-04
dc.identifier.citation	Journal of Sound and Vibration, 2020, 479
dc.identifier.issn	0022-460X
dc.identifier.issn	1095-8568
dc.identifier.uri	http://hdl.handle.net/10453/145985
dc.description.abstract	© 2020 Elsevier Ltd We propose a strategy for constructing an asymmetric sound absorber by coupling two mutually tuned dark and bright modes. The subsequent requirement is that the dark mode must be strongly dissipative to consume sound energy, whereas the bright mode exhibit weak damping and be characterized as an effective soft boundary to block the sound energy into the exit port. Thus, the system provides an absorbing response to sound incident from the port near the dark mode but a reflecting response to sound from the opposite port. We theoretically and experimentally demonstrate the asymmetric absorber in a straight waveguide shunted by Helmholtz resonators (HRs), in which the bright–dark modes are served by the HRs with different short neck radii. The asymmetry is further enhanced by coupling additional modes with a moderate loss factor set in between. Moreover, the operation frequency of the asymmetric absorptions can be reconfigured by the synchronously varied HR specimens along with the cavity depth, which guarantees the construction of an asymmetric broadband absorber by means of the parallel coupling of four enhanced asymmetric absorptive systems. Our investigations offer an efficient means of asymmetrically manipulating sound absorption/reflection and provide a sound absorber with superior characteristics to the traditional single-port absorber.
dc.language	English
dc.publisher	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
dc.relation.ispartof	Journal of Sound and Vibration
dc.relation.isbasedon	10.1016/j.jsv.2020.115371
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	02 Physical Sciences, 09 Engineering
dc.subject.classification	Acoustics
dc.title	Tunable and broadband asymmetric sound absorptions with coupling of acoustic bright and dark modes
dc.type	Journal Article
utslib.citation.volume	479
utslib.for	02 Physical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2021-02-09T05:17:11Z
pubs.publication-status	Published
pubs.volume	479

Abstract:

© 2020 Elsevier Ltd We propose a strategy for constructing an asymmetric sound absorber by coupling two mutually tuned dark and bright modes. The subsequent requirement is that the dark mode must be strongly dissipative to consume sound energy, whereas the bright mode exhibit weak damping and be characterized as an effective soft boundary to block the sound energy into the exit port. Thus, the system provides an absorbing response to sound incident from the port near the dark mode but a reflecting response to sound from the opposite port. We theoretically and experimentally demonstrate the asymmetric absorber in a straight waveguide shunted by Helmholtz resonators (HRs), in which the bright–dark modes are served by the HRs with different short neck radii. The asymmetry is further enhanced by coupling additional modes with a moderate loss factor set in between. Moreover, the operation frequency of the asymmetric absorptions can be reconfigured by the synchronously varied HR specimens along with the cavity depth, which guarantees the construction of an asymmetric broadband absorber by means of the parallel coupling of four enhanced asymmetric absorptive systems. Our investigations offer an efficient means of asymmetrically manipulating sound absorption/reflection and provide a sound absorber with superior characteristics to the traditional single-port absorber.

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http://hdl.handle.net/10453/145985