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Structure-Acoustic Coupling Analysis
Naval and aerodynamic designers are concerned about the sound radiated from vibrating complex structures in heavy or light fluid medium excited by broadband random forces, that is, mechanical forces or turbulent boundary layer (TBL) pressure fluctuations. They wish to minimize significant noise radiation both outward to the medium and inward to the structure inside. Hence a method for computing the vibroacoustic response of structures acted by broadband random forces is of critical value to the designer by permitting him to select appropriate structural modifications (e.g. damping treatments) or to apply appropriate mechanical forces to structures to suppress structural vibration and the associated radiation of sound. Accurate methods of computation for the vibroacoustic response of the key components of complex structures such as plates and cylinders excited by random forces will provide a useful foundation extensible to more complex structures, e.g. airplane fuselage-wing systems, missiles, ribbed sonar domes, and ship-hull systems, etc. This thesis presents theoretical formulations of acoustic radiation from rectangular plates with a few ideal edge conditions in heavy and light fluid media excited by random forces, that is, arbitrary mechanical forces or turbulent boundary layer pressure fluctuations, in the presence of a uniform subsonic flow