This paper discusses strategies to design piezoelectric sensors positioning and gains aiming at effective closed-loop performance of output feedback active structural vibration control. The general concept of spatial modal filters using networks of sensors to enable modal focusing is considered. However, differently from previous results published in the literature, the present study provides a closed-loop optimization of the piezoelectric sensors locations and gains and includes a low-pass filter to provide stability at higher frequencies, in which the phase lag of the low-pass filter is fully accounted for. An example of a clamped plate with various numbers of piezoelectric patches serving as sensors and actuators is studied and presented. An assessment of required number of sensors for a satisfactory performance is carried out. The potential acoustic emission due to structural vibration is used to define target modes and to assess the effectiveness of the proposed active control strategy in reducing that emission. Satisfactory results were obtained for controlling selected vibration modes and their acoustic emission within a wide frequency range and with a reduced number of piezoelectric sensors. The main contribution and originality of this paper is to perform for the first time the control design of a plate-type structure using a network of piezoelectric sensors by combining spatial and digital filters and including simultaneous optimization of filter and control parameters and sensors locations.
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