LQG-based robust broadband control of acoustic-structure interaction in 3-D enclosure

This paper presents an LQG-based robust control strategy for a noise reduction in 3 -D enclosure wherein acoustic-structure interaction dynamics is present. The dynamic model of the system is obtained using frequency-domain system identification techniques. The state weighting matrix in the LQG cost function is determined analytically in the closed-form which allows the control designer to penalize the total acoustic energy of the system. The robustness of controller is ensured via an iterative LQG design that satisfies frequency-domain robustness condition. Simulation and experiment results are given which demonstrate the effectiveness of the controller.