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 analogues to a multi-tuned, acoustic band rejection filter that has the shell's 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.
Scattering from large planar gratings of compliant cylindrical shells
Streuung der Schallwellen durch die Flachgitter nachgiebiger, zylindrischer Schalen
US Government Reports ; 1-59
1976
59 Seiten
Report
Englisch
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