Homogeneous and sandwich active panels under deterministic and stochastic excitation
Homogeneous and sandwich active panels under deterministic and stochastic excitation
In this paper an element-based model is used to predict the structural response and sound radiation of two smart panels excited by (a) an acoustic plane wave, (b) a stochastic acoustic diffuse field, and (c) a turbulent boundary layer. The first panel is made of aluminum, while the second is a composite sandwich panel with equivalent static stiffness but four times lower mass per unit area. The panels are
equipped with 16 decentralized velocity feedback control loops using idealized point force actuators. In contrast to previous studies on smart panels, the analysis is extended to the upper end of the audio frequency range. In this frequency region the response and sound radiation of the panels strongly depend on the spatial characteristics of the excitation field and the sound radiation properties with respect to the bending wavelength on the panels. Considerable reduction in structural response and sound radiation is predicted for the low audio frequency range where the panel response is dominated by well separated resonances of low order structural modes. It is also found that some reduction can be achieved around acoustic and convective coincidence regions.
acoustic field, acoustic resonance, acoustic variables control, acoustic wave scattering, aluminium, bending, boundary layer turbulence, composite, materials, decentralised control, feedback, intelligent structures, sandwich structures, structural acoustics, structural panels
3696-3706
Rohlfing, J.
d8f611a6-8ee7-47bd-8616-59d806bc1788
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
June 2009
Rohlfing, J.
d8f611a6-8ee7-47bd-8616-59d806bc1788
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
Rohlfing, J. and Gardonio, P.
(2009)
Homogeneous and sandwich active panels under deterministic and stochastic excitation.
Journal of the Acoustical Society of America, 125 (6), .
(doi:10.1121/1.3123405).
Abstract
In this paper an element-based model is used to predict the structural response and sound radiation of two smart panels excited by (a) an acoustic plane wave, (b) a stochastic acoustic diffuse field, and (c) a turbulent boundary layer. The first panel is made of aluminum, while the second is a composite sandwich panel with equivalent static stiffness but four times lower mass per unit area. The panels are
equipped with 16 decentralized velocity feedback control loops using idealized point force actuators. In contrast to previous studies on smart panels, the analysis is extended to the upper end of the audio frequency range. In this frequency region the response and sound radiation of the panels strongly depend on the spatial characteristics of the excitation field and the sound radiation properties with respect to the bending wavelength on the panels. Considerable reduction in structural response and sound radiation is predicted for the low audio frequency range where the panel response is dominated by well separated resonances of low order structural modes. It is also found that some reduction can be achieved around acoustic and convective coincidence regions.
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Published date: June 2009
Keywords:
acoustic field, acoustic resonance, acoustic variables control, acoustic wave scattering, aluminium, bending, boundary layer turbulence, composite, materials, decentralised control, feedback, intelligent structures, sandwich structures, structural acoustics, structural panels
Identifiers
Local EPrints ID: 71506
URI: http://eprints.soton.ac.uk/id/eprint/71506
ISSN: 0001-4966
PURE UUID: 7305fceb-ab39-4344-8385-96eef2cee04b
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Date deposited: 05 Mar 2010
Last modified: 13 Mar 2024 20:30
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Author:
J. Rohlfing
Author:
P. Gardonio
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