On Inextensional Vibrations of Thin Shells

[+] Author and Article Information
E. W. Ross

U. S. Army Natick Laboratories, Natick, Mass.

J. Appl. Mech 35(3), 516-523 (Sep 01, 1968) (8 pages) doi:10.1115/1.3601245 History: Received September 20, 1967; Revised February 16, 1968; Online September 14, 2011


In this paper the nonsymmetric, free, elastic vibrations of thin domes of revolution are studied. It is assumed that the frequency is low. The asymptotic approximations previously given by the writer are used to estimate the general solution to the shell vibration equations at low frequencies. Approximations for the low natural frequencies and modes are derived systematically under a variety of edge conditions. Low natural frequencies are found only when the edge conditions impose no forces tangent to the shell surface. When the edge is free (and only then) Rayleigh’s inextensional frequencies are recovered. For certain other edge conditions, new natural frequencies are found that are above Rayleigh’s frequencies but still low compared, e.g., with the lowest membrane frequency. The displacement modes associated with these new frequencies are mostly of inextensional type. The general results are applied to estimate these new frequencies for spherical domes.

Copyright © 1968 by ASME
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