Effect of damping distribution on coupling in panel–cavity systems: Conditions for optimality through a modal approach

Nerse, C; Wang, S; Goo, S

Effect of damping distribution on coupling in panel–cavity systems: Conditions for optimality through a modal approach

Nerse, C

Wang, S Goo, S

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: International Journal of Mechanical Sciences, 2020, 187, pp. 105908-105908
Issue Date:: 2020-12-01

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Field	Value	Language
dc.contributor.author	Nerse, C https://orcid.org/0000-0003-4003-6262
dc.contributor.author	Wang, S
dc.contributor.author	Goo, S
dc.date.accessioned	2021-02-09T19:33:33Z
dc.date.available	2021-02-09T19:33:33Z
dc.date.issued	2020-12-01
dc.identifier.citation	International Journal of Mechanical Sciences, 2020, 187, pp. 105908-105908
dc.identifier.issn	0020-7403
dc.identifier.uri	http://hdl.handle.net/10453/145998
dc.description.abstract	© 2020 In this study, we examine an acoustic–structure interaction problem for nonproportionally damped systems. Coupled responses for a structure and acoustic enclosure are derived using a modified modal coupling formulation. Uncoupled modal patterns are used to assess the coupling effectiveness. Comparison with a proportional damping case reveals characteristics that associate complex modes with damping optimality. Such an interrelation is investigated through topology optimization of a damping layer to minimize the acoustic pressure in the cavity. The findings of this numerical study indicate a spatial relation between the imaginary part of the coupling coefficient and the optimal damping layout. Further investigation of complex modal patterns with wave interpretation shows that the optimal damping characteristics of the panel can be expressed by a spatially varying nonproportional damping index. Case studies involving various nonproportional damping configurations are presented to confirm the significant correlation with respect to observed phenomena.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	International Journal of Mechanical Sciences
dc.relation.isbasedon	10.1016/j.ijmecsci.2020.105908
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0905 Civil Engineering, 0910 Manufacturing Engineering, 0913 Mechanical Engineering
dc.subject.classification	Mechanical Engineering & Transports
dc.title	Effect of damping distribution on coupling in panel–cavity systems: Conditions for optimality through a modal approach
dc.type	Journal Article
utslib.citation.volume	187
utslib.for	0905 Civil Engineering
utslib.for	0910 Manufacturing Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-02-09T19:33:23Z
pubs.publication-status	Published
pubs.volume	187

Abstract:

© 2020 In this study, we examine an acoustic–structure interaction problem for nonproportionally damped systems. Coupled responses for a structure and acoustic enclosure are derived using a modified modal coupling formulation. Uncoupled modal patterns are used to assess the coupling effectiveness. Comparison with a proportional damping case reveals characteristics that associate complex modes with damping optimality. Such an interrelation is investigated through topology optimization of a damping layer to minimize the acoustic pressure in the cavity. The findings of this numerical study indicate a spatial relation between the imaginary part of the coupling coefficient and the optimal damping layout. Further investigation of complex modal patterns with wave interpretation shows that the optimal damping characteristics of the panel can be expressed by a spatially varying nonproportional damping index. Case studies involving various nonproportional damping configurations are presented to confirm the significant correlation with respect to observed phenomena.

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