Discrete Analysis for the Dynamic Response of Stiffened Shells.
WEIDLINGER (PAUL) NEW YORK
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The natural frequencies and mode shapes for the vibrations of stiffened cylindrical shells with or without hemispherical end caps are evaluated. The approach utilizes a discrete theory in which the shell elements and the stiffeners are considered as separate structures and compatibility is enforced at their junctures. The results are compared with those from continuum theory in which the stiffener effects are smeared over the shell. Numerical results are presented for frequencies and mode shapes for several cases of interest. The theoretical results have been compared with a set of experimental results from the Ordnance Research Laboratories and excellent agreement has been found. Upon publication of the experimental results, the detailed comparisons of theory and experiment will be distributed as a supplement to this report. Author