Virginia Tech. Bradley Department of Electrical and Computer Engineering. Interdisciplinary Center for Applied Mathematics. Smart Materials and Structures LaboratoryVirginia Tech. Department of Mechanical Engineering. Interdisciplinary Center for Applied Mathematics. Smart Materials and Structures LaboratoryBaumann, William T.Saunders, William R.Robertshaw, Harry H.2015-05-262015-05-261991-12-01Baumann, 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: 10.1121/1.4014290001-4966http://hdl.handle.net/10919/52597The 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.7 pagesapplication/pdfenIn CopyrightControl systemsComputer simulationControl theoryRadiation monitoringStructural acousticsArticle - Refereedhttp://scitation.aip.org/content/asa/journal/jasa/90/6/10.1121/1.401429https://doi.org/10.1121/1.401429