The vibrating circular plate generates an acoustic pressure wave in a fluid. The interactions between sound and vibration have been the subject of several previous investigations, but the solution for the radiated acoustic pressure has been obtained for the plate which has been placed in a planar rigid and unlimited baffle. However, the real acoustical systems often differ from this model because the radius of the source is comparable with linear dimensions of the baffle. If emitted waves are comparable with the geometrical size of the source, then the finite dimension of the baffle has an influence on the acoustic radiation of the system under consideration.In this paper, the problem of active vibration control of a circular, fluid-loaded and excited harmonically at low frequencies plate is presented. It was assumed that the plate was clamped at the circumference in a limited baffle and radiated into Moderately "heavy" fluid. Standard linear system theory was applied to reduce the vibration of the considered plate using controllers with position and vibration velocity errors feedback signals.
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