Identification of Underwater Targets via Active Sonar
COASTAL SYSTEMS STATION PANAMA CITY FL
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The main thrust of this research was to experimentally determine the resonances in cylindrical-like structures. When such a structure is insonified with a single frequency sinusoidal acoustic energy, there will be some deformation of the structure and internal waves will propagate through it. Some waves will travel from one edge, through the center, to the other edge, and be reflected back. Others will travel around the structure circumferentially. If the driving frequency, the radial waves, and the circumferential waves are in phase at the driving point, resonance will occur. The circumferential waves are usually described by sinusoidal functions while the radial waves are described by Bessel and Hankel functions.