Abstract
Several studies have been conducted in order to find the optimal location of actuators and sensors in the active vibration control of structures. In this paper, a modified optimization criterion is proposed for these two optimization problems, ensuring good observability or good controllability of the structure, and considering residual modes to limit the spill-over effects. Its efficiency is shown by the comparison with the classical criteria, illustrated for a simply supported beam and a rectangular plate. In these two applications, the number of active elements is discussed, using or neglecting the residual modes.
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