Active Structural Acoustic Control of a Softcore Sandwich Panel Using Multiple Piezoelectric Actuators and Reddy's Higher Order Theory
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In this article, two control methods, volume velocity and weighted sum of spatial gradients (WSSG), are used to drive three piezoelectric actuators attached on the exterior side of the bottom face plate.Abstract:
The purpose of the present work is to theoretically investigate the active control of radiated sound power from a simply supported soft-core sandwich panel with a line moment excitation. Since noise transmission in the low frequency region through a soft-core sandwich panel mainly occurs due to flexural and dilatational modes, therefore, the focus of this study is to control these modes and achieve sound attenuation in a large frequency band. Two control methods, volume velocity and weighted sum of spatial gradients (WSSG) are used to drive three piezoelectric actuators (PZTs) attached on the exterior side of the bottom face plate. The governing equation of the sandwich panel with the PZTs is derived using the Hamilton’s principle considering Reddy’s third order shear deformation theory. Numerical studies indicate that while the line moment is at the mid vertical line, WSSG is able to attenuate the radiated sound power irrespective of core loss factor whereas volume velocity could not. However, both the c...read more
Citations
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References
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Radiation modes and the active control of sound power
Stephen J. Elliott,M. E. Johnson +1 more
TL;DR: In this article, the authors compared two different formulations for calculating the total acoustic power radiated by a structure, in terms of the amplitudes of the structural modes and the velocities of an array of elemental radiators on the surface of the structure.
Journal ArticleDOI
Active control of sound radiation using volume velocity cancellation
M. E. Johnson,Stephen J. Elliott +1 more
TL;DR: In this article, the effects of minimizing the sound power radiated by the panel and canceling the net volume velocity of the panel are compared not only in terms of the reduction in sound radiation but also in the change in the space average mean-squared velocity of a panel and its surface pressure at its surface, and it is shown that volume velocity cancellation gives similar reductions in transmitted sound power to the minimization of sound power radiation up to frequencies at which the size of the plate is about half an acoustic wavelength.
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