EXACT REACHABILITY OF FINITE ENERGY STATES FOR AN ACOUSTIC WAVE/PLATE INTERACTION UNDER THE INFLUENCE OF BOUNDARY AND LOCALIZED CONTROLS By

In this work, we derive a result of exact controllability for a structural acoustic partial differential equation (PDE) model, comprised of a three-dimensional interior acoustic wave equation coupled to a two-dimensional Kirchoff plate equation, with the coupling being accomplished across a boundary interface. For this PDE system, we show that by means of boundary controls, the interior wave and Kirchoff plate initial data can be steered to an arbitrary finite energy state. In this work, key use is made of recent, microlocally-derived, L ×H−1 “recovery” estimates for wave equations with Dirichlet boundary data. Moreover, the coupling of the disparate acoustic wave/Kirchoff plate dynamics is reconciled by means of sharp regularity estimates which are valid for hyperbolic equations of second order.