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Extensional-Wave and Flexural-Wave Contributions to the Sound Field Radiated by a Fluid-Loaded Infinite Plate,
NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE DETACHMENT
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A structural thick plate theory that accounts for the propagation of both extensional and flexural waves in an infinite elastic plate is used to calculate the farfield directional response of the sound radiated by a plate with fluid on one side. The plate is driven by a harmonic point force, and the radiation in the farfield of the driving point is considered. Computations are made for metal plates and plates composed of polymeric materials in water and in air. Anelastic behavior of the plates is considered. The computations, which are made in order to compare the radiated fields of plates in which only flexural waves or only extensional waves can propagate, or in which both wave types can propagate concurrently, show that the radiation caused by extensional waves can make an important contribution to the sound field of an elastic plate. Reprints
APPROVED FOR PUBLIC RELEASE