Abstract
In this paper, active control of harmonic sound transmitted through a soft-core sandwich panel is studied. As it has already been shown for the low frequency region, the noise transmission through a soft-core sandwich panel mainly occurs due to the flexural and the dilatational modes [Rimas Vaicaitis, NASATechnical Note, NASATN D-8516, 1977]. Therefore, in this study, the volume velocity and weighted sum of spatial gradients methods are used to control these modes, and achieve sound attenuation in a broad frequency range. A point force actuator is used as the secondary force to control the radiation modes of the bottom faceplate. Radiated sound power from these two control theories is compared for different values of isotropic loss factor of core. Numerical studies indicate that irrespective of core loss factor weighted sum of spatial gradients method works well in a large frequency band without increasing the radiated sound power unlike the volume velocity method.
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