The aim of this paper is to design and experimentally evaluate the performance of a feedback controller to suppress vibration of a flexible beam. The controller is designed to minimize the spatial H{sub}2 norm of the closed-loop system to ensure average reduction of vibration throughout the entire structure. Vibrations of the first six bending modes of the beam are to be controlled using a collocated piezoelectric actuator-sensor pair attached to the beam. Feedthrough terms are incorporated into the flexible-structure model to correct the locations of the in-bandwidth zeros. It is shown that the spatial H{sub}2 control has an advantage over the pointwise H{sub}2 control in minimizing the vibration of the entire structure. The spatial H{sub}2 controller minimizes the H{sub}2 norm of the entire structure more uniformly, while the pointwise H{sub}2 controller only has a local effect. The implemented spatial H{sub}2 controller is able to minimize the first six bending modes of the beam effectively. This spatial H{sub}2 control can also be applied to more general structural vibration suppression problems.
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