Abstract
The acoustic scattering from an insonified finite bilaminar cylindrical shell stiffened by a thin circular rib-stiffener is analyzed. The two cylindrical shell laminates are perfectly bonded having the same lateral dimension but have different radii and material properties. The bilaminar shell is analyzed using the exact theory of three-dimensional elasticity. The thin rib-stiffener has rectangular cross-section and is perfectly bonded to the inside of the inner shell. It is analyzed as a thin elastic ring. The finite shell has shear-diaphragm supports at ends z = 0 and L and is terminated by two semi-infinite rigid cylindrical baffles. The shell is insonified by an incident plane wave at an oblique incidence angle. The scattered acoustic farfield is evaluated for various incident wave frequencies and stiffener location and dimensions. A uniform steel stiffened shell in water was initially analyzed to study the influence of stiffened-shell geometries on the scattered acoustic farfield. A second shell made up of an outer elastomer shell bonded to an inner stiffened steel shell was also analyzed to study the influence of elastomeric properties on acoustic scattering. [Work supported by NAVSEA Division Newport under ONR Summer Faculty Program.]
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