Active acoustic cloaking of cylindrical shells in low Mach number flow

Kerferd, B; Eggler, D; Karimi, M; Kessissoglou, N

Active acoustic cloaking of cylindrical shells in low Mach number flow

Kerferd, B Eggler, D Karimi, M

Kessissoglou, N

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Sound and Vibration, 2020, 479, (4), pp. 1-22
Issue Date:: 2020-05-01

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Field	Value	Language
dc.contributor.author	Kerferd, B
dc.contributor.author	Eggler, D
dc.contributor.author	Karimi, M https://orcid.org/0000-0002-2949-5364
dc.contributor.author	Kessissoglou, N
dc.date.accessioned	2020-10-27T19:57:27Z
dc.date.available	2020-10-27T19:57:27Z
dc.date.issued	2020-05-01
dc.identifier.citation	Journal of Sound and Vibration, 2020, 479, (4), pp. 1-22
dc.identifier.issn	0022-460X
dc.identifier.issn	1095-8568
dc.identifier.uri	http://hdl.handle.net/10453/143544
dc.description.abstract	The vibro-acoustic responses of a two-dimensional cylindrical shell in low Mach number flow are herein derived. The analytical model takes into account the structural elasticity and coupling of the shell vibration with its interior and exterior acoustic fields in the presence of a moving fluid. The cylindrical shell is modelled using Donnell-Mushtari theory. Taylor transformations are employed to transfer the convected wave equation into the ordinary wave equation which was then solved using scattering theory. Three excitation cases corresponding to a plane wave, an external monopole source and a radial point force applied directly to the shell are considered. Shell circumferential resonances and interior acoustic resonances are identified. Two active control strategies are then applied to acoustically cloak the cylindrical shell at its acoustic and structural resonances. The first control approach employs acoustic control sources in the exterior fluid domain. In the second approach, control forces are applied to directly excite the elastic shell, whereby the structural response is actively modified to manipulate the scattered and radiated acoustic fields arising from plane wave excitation of the shell. Results show that the second approach is superior in terms of both reduced control effort and cloaking of the global exterior domain. For both control approaches, the performance of the active cloak is shown to deteriorate if the convected flow field is not accounted for in the control process.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Sound and Vibration
dc.relation.isbasedon	10.1016/j.jsv.2020.115400
dc.rights	Elsevier required licence: © 2020 . This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The definitive publisher version is available online at https://doi.org/10.1016/j.jsv.2020.115400	en_US
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	02 Physical Sciences, 09 Engineering
dc.subject.classification	Acoustics
dc.title	Active acoustic cloaking of cylindrical shells in low Mach number flow
dc.type	Journal Article
utslib.citation.volume	479
utslib.for	0913 Mechanical Engineering
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	open_access	*
pubs.consider-herdc	true
dc.date.updated	2020-10-27T19:57:08Z
pubs.issue	4
pubs.publication-status	Published
pubs.volume	479
utslib.citation.issue	4

Abstract:

The vibro-acoustic responses of a two-dimensional cylindrical shell in low Mach number flow are herein derived. The analytical model takes into account the structural elasticity and coupling of the shell vibration with its interior and exterior acoustic fields in the presence of a moving fluid. The cylindrical shell is modelled using Donnell-Mushtari theory. Taylor transformations are employed to transfer the convected wave equation into the ordinary wave equation which was then solved using scattering theory. Three excitation cases corresponding to a plane wave, an external monopole source and a radial point force applied directly to the shell are considered. Shell circumferential resonances and interior acoustic resonances are identified. Two active control strategies are then applied to acoustically cloak the cylindrical shell at its acoustic and structural resonances. The first control approach employs acoustic control sources in the exterior fluid domain. In the second approach, control forces are applied to directly excite the elastic shell, whereby the structural response is actively modified to manipulate the scattered and radiated acoustic fields arising from plane wave excitation of the shell. Results show that the second approach is superior in terms of both reduced control effort and cloaking of the global exterior domain. For both control approaches, the performance of the active cloak is shown to deteriorate if the convected flow field is not accounted for in the control process.

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http://hdl.handle.net/10453/143544