This paper shows a new method of active vibration control of a flexible plate structure with aim to reduce the radiated noise. It involves modeling the real structure into a reduced order lumped parameter model on the basis of modal analysis, and then adopting LQ control theory to control the vibration of selected multi-modes of the plate. In this paper the modeling procedure and the control strategy design is presented, in which suboptimal control theory and digital filtering technique have been used. Simulation and preliminary experimental results are given to demonstrate the effectiveness of the proposed method.

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