Scattering from Large Planar Gratings of Compliant Cylindrical Shells.
NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CONN NEW LONDON LAB
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A two-dimensional mathematical model for estimating the scattering of plane acoustic waves from an infinite, uniform, plane grating of compliant, elliptical, cylindrical shells is developed. Calculations from the mathematical model are found to be in reasonable agreement with measurements of large experimental arrays. The array is shown to be analogous to a multi-tuned, acoustic band rejection filter that has the shells fundamental flexural mode in the array for its center frequency. General low frequency approximations are made, the scattering matrix is truncated at the quadrupole mode, and the array transmission is computed for several specific geometries. Conditions for an ultra-wide resonance bandwidth having very high array resonance reflectivity for pressure compensated elements are considered. Alternative applications for compliant tube gratings, e.g., as an acoustic window that provides mechanical shading for a sonar receiving array, are discussed.
- Acoustic Detection and Detectors