A broadband active sound absorber with adjustable absorption coefficient and bandwidth.

Wang, K; Shi, L; Zou, H; Zhao, S; Shen, C; Lu, J

A broadband active sound absorber with adjustable absorption coefficient and bandwidth.

Wang, K Shi, L Zou, H Zhao, S

Shen, C Lu, J

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Publisher:: ACOUSTICAL SOC AMER AMER INST PHYSICS
Publication Type:: Journal Article
Citation:: J Acoust Soc Am, 2024, 156, (2), pp. 1048-1057
Issue Date:: 2024-08-01

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Field	Value	Language
dc.contributor.author	Wang, K
dc.contributor.author	Shi, L
dc.contributor.author	Zou, H
dc.contributor.author	Zhao, S https://orcid.org/0000-0002-6261-8864
dc.contributor.author	Shen, C
dc.contributor.author	Lu, J
dc.date.accessioned	2024-10-31T03:42:02Z
dc.date.available	2024-07-25
dc.date.available	2024-10-31T03:42:02Z
dc.date.issued	2024-08-01
dc.identifier.citation	J Acoust Soc Am, 2024, 156, (2), pp. 1048-1057
dc.identifier.issn	0001-4966
dc.identifier.issn	1520-8524
dc.identifier.uri	http://hdl.handle.net/10453/181646
dc.description.abstract	Broadband adjustable sound absorbers are desired for controlling the acoustic conditions within enclosed spaces. Existing studies on acoustic absorbers, either passive or active, aim to maximize the sound absorption coefficients over an extended frequency band. By contrast, this paper introduces a tunable acoustic absorber, whose working frequency band and sound absorption characteristics can be defined by users for different applications. The approach leverages an error signal that can be synthesized using a standing wave separation technique. The error signal encodes different target reflection coefficients, leading to arbitrary absorption coefficients between 0 and 1. Experimental validation is conducted in a one-dimensional standing wave tube, demonstrating that the proposed active absorber achieves near-perfect absorption within the 150-1600 Hz frequency range, boasting an average absorption coefficient of 0.98. Adjustable absorption is demonstrated across three octave bands, aligning closely with theoretical predictions. Furthermore, when coupled with a shaping filter, the absorber exhibits spectrally tunable broadband absorption capabilities, selectively reflecting specific frequency bands while effectively absorbing others. These outcomes underscore the versatile tunability of the proposed active acoustic absorber, which is expected to pave the way for personalized regulating of the indoor acoustic environment.
dc.format	Print
dc.language	eng
dc.publisher	ACOUSTICAL SOC AMER AMER INST PHYSICS
dc.relation.ispartof	J Acoust Soc Am
dc.relation.isbasedon	10.1121/10.0028196
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in [The Journal of the Acoustical Society of America, 2024, Volume 15, Issue 2, pp. 048-1057]and may be found at https://doi.org/10.1121/10.0028196
dc.subject.classification	Acoustics
dc.title	A broadband active sound absorber with adjustable absorption coefficient and bandwidth.
dc.type	Journal Article
utslib.citation.volume	156
utslib.location.activity	United States
pubs.organisational-group	University of Technology Sydney
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/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Audio, Acoustics and Vibration (CAAV)
utslib.copyright.status	open_access	*
dc.date.updated	2024-10-31T03:42:00Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	156
utslib.citation.issue	2

Abstract:

Broadband adjustable sound absorbers are desired for controlling the acoustic conditions within enclosed spaces. Existing studies on acoustic absorbers, either passive or active, aim to maximize the sound absorption coefficients over an extended frequency band. By contrast, this paper introduces a tunable acoustic absorber, whose working frequency band and sound absorption characteristics can be defined by users for different applications. The approach leverages an error signal that can be synthesized using a standing wave separation technique. The error signal encodes different target reflection coefficients, leading to arbitrary absorption coefficients between 0 and 1. Experimental validation is conducted in a one-dimensional standing wave tube, demonstrating that the proposed active absorber achieves near-perfect absorption within the 150-1600 Hz frequency range, boasting an average absorption coefficient of 0.98. Adjustable absorption is demonstrated across three octave bands, aligning closely with theoretical predictions. Furthermore, when coupled with a shaping filter, the absorber exhibits spectrally tunable broadband absorption capabilities, selectively reflecting specific frequency bands while effectively absorbing others. These outcomes underscore the versatile tunability of the proposed active acoustic absorber, which is expected to pave the way for personalized regulating of the indoor acoustic environment.

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http://hdl.handle.net/10453/181646