Discrete Analysis for the Dynamic Response of Stiffened Shells

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...

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Bibliographic Details
Main Authors: Harari,Azriel, Baron,Melvin L
Format: Report
Language:English
Subjects:
BOUNDARY VALUE PROBLEMS
BUCKLING
CYLINDRICAL BODIES
DYNAMIC RESPONSE
EIGENVECTORS
KINETIC ENERGY
LOADS(FORCES)
Mechanics
PARTIAL DIFFERENTIAL EQUATIONS
POTENTIAL ENERGY
RESONANT FREQUENCY
SHELLS(STRUCTURAL FORMS)
SPHERES
SPHERICAL SHELLS
STIFFENED CYLINDERS
VIBRATION
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Summary: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)