Quiet zone generation in an acoustic free field using multiple parametric array loudspeakers.

Zhong, J; Zhuang, T; Kirby, R; Karimi, M; Zou, H; Qiu, X

Quiet zone generation in an acoustic free field using multiple parametric array loudspeakers.

Zhong, J

Zhuang, T Kirby, R

Karimi, M

Zou, H Qiu, X

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Publisher:: ACOUSTICAL SOC AMER AMER INST PHYSICS
Publication Type:: Journal Article
Citation:: J Acoust Soc Am, 2022, 151, (2), pp. 1235
Issue Date:: 2022-02

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Field	Value	Language
dc.contributor.author	Zhong, J https://orcid.org/0000-0002-9972-8004
dc.contributor.author	Zhuang, T
dc.contributor.author	Kirby, R https://orcid.org/0000-0002-3520-1377
dc.contributor.author	Karimi, M https://orcid.org/0000-0002-2949-5364
dc.contributor.author	Zou, H
dc.contributor.author	Qiu, X https://orcid.org/0000-0002-5181-1220
dc.date.accessioned	2023-03-10T04:24:56Z
dc.date.available	2023-03-10T04:24:56Z
dc.date.issued	2022-02
dc.identifier.citation	J Acoust Soc Am, 2022, 151, (2), pp. 1235
dc.identifier.issn	0001-4966
dc.identifier.issn	1520-8524
dc.identifier.uri	http://hdl.handle.net/10453/166967
dc.description.abstract	This paper investigates the feasibility of remotely generating a quiet zone in an acoustic free field using multiple parametric array loudspeakers (PALs). A primary sound field is simulated using point monopoles located randomly in a two-dimensional plane, or three-dimensional (3D) space, whereas the secondary sound field is generated by multiple PALs uniformly distributed around the circumference of a circle sitting on the same plane as the primary sources, or on the surface of a sphere for 3D space. A quiet zone size is defined as the diameter of the maximal circular zone within which the noise reduction is greater than 10 dB. The size of this quiet zone is found to be proportional to 0.19λN for N secondary sources with a wavelength λ when the primary and secondary sources are in the same plane, whereas it is found to be 0.55λN1/2 for the 3D case. The size of the quiet zones generated by PALs is similar to that observed with traditional omnidirectional loudspeakers; however, the effects of using PALs on the sound field outside the target zone is much smaller due to their sharp radiation directivity and slow decay rate along the propagation distance. Experimental results are also presented to validate these numerical simulations.
dc.format	Print
dc.language	eng
dc.publisher	ACOUSTICAL SOC AMER AMER INST PHYSICS
dc.relation	http://purl.org/au-research/grants/arc/LP160100616
dc.relation.ispartof	J Acoust Soc Am
dc.relation.isbasedon	10.1121/10.0009587
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Acoustics
dc.title	Quiet zone generation in an acoustic free field using multiple parametric array loudspeakers.
dc.type	Journal Article
utslib.citation.volume	151
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
utslib.copyright.status	closed_access	*
dc.date.updated	2023-03-10T04:24:54Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	151
utslib.citation.issue	2

Abstract:

This paper investigates the feasibility of remotely generating a quiet zone in an acoustic free field using multiple parametric array loudspeakers (PALs). A primary sound field is simulated using point monopoles located randomly in a two-dimensional plane, or three-dimensional (3D) space, whereas the secondary sound field is generated by multiple PALs uniformly distributed around the circumference of a circle sitting on the same plane as the primary sources, or on the surface of a sphere for 3D space. A quiet zone size is defined as the diameter of the maximal circular zone within which the noise reduction is greater than 10 dB. The size of this quiet zone is found to be proportional to 0.19λN for N secondary sources with a wavelength λ when the primary and secondary sources are in the same plane, whereas it is found to be 0.55λN1/2 for the 3D case. The size of the quiet zones generated by PALs is similar to that observed with traditional omnidirectional loudspeakers; however, the effects of using PALs on the sound field outside the target zone is much smaller due to their sharp radiation directivity and slow decay rate along the propagation distance. Experimental results are also presented to validate these numerical simulations.

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http://hdl.handle.net/10453/166967