Abstract: Active control architectures for broadband acoustic radiation reduction are compared both analytically and experimentally on a representative structure to quantify the capabilities and limitations of the proposed control methodologies. Specifically, three broad categories of control are compared: classical feedback (rate feedback), optimal feedback (Linear Quadratic Gaussian), and adaptive feedforward control (x-filtered Least Mean Square). A simple radiation model of the light fluid, structural-acoustic behavior of the composite panel is utilized to design the compensators and predict closed-loop performance. For each type of control, a single input, single output design is implemented on a composite panel with embedded active fiber composite piezoelectric actuators. Both the vibration and acoustic performance is recorded for each experiment under equivalent conditions to facilitate a generalizable comparison. Experimental results lead to generalized conclusions pertaining to the application of active structural-based control to improve the acoustic performance of complex structures.!26
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