Active suppression of acoustic radiation from impulsively excited structures

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Acoustical Society of America

The objective is to use active control to suppress the acoustic energy that is radiated to the far field from a structure that has been excited by a short-duration pulse. The problem is constrained by the assumption that the far-field pressure cannot be directly measured. Therefore, a method is developed for estimating the total radiated energy from measurements on the structure. Using this estimate as a cost function, a feedback controller is designed using linear quadratic regulator theory to minimize the cost. Computer simulations of a clamped-clamped beam show that there is appreciable difference in the total radiated energy between a system with a controller designed to suppress vibrations of the structure and a system with a controller that takes into account the coupling of these vibrations to the surrounding fluid. The results of this work provide a framework for a general, model-based method for actively suppressing transient structural acoustic radiation that can also be applied to steady, narrow, or broadband disturbances.

Control systems, Computer simulation, Control theory, Radiation monitoring, Structural acoustics
Baumann, W. T., Saunders, W. R., & Robertshaw, H. H. (1991). Active suppression of acoustic radiation from impulsively excited structures. Journal of the Acoustical Society of America, 90(6), 3202-3208. doi: 10.1121/1.401429