Phenomena of Aliasing and Pass and Stop Bands in the Drive in Lieu of Ribs on Cylindrical Shells.
Rept. 1 Jan-31 Jul 96,
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
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This report constitutes an introduction to the investigation of the response of geometrically simple structural shells. The simplicity stems not only with respect to the mechanical description of the shell but also with respect to the inclusion of fluid loading. The report further deals with the influence of attaching ribs to the shells. The attachments are also confined to specific geometries namely, those in which the ribs are set parallel and in conformity with the geometrical scheme of the shell. Again, this is devised to keep the formalism simple. Moreover, the formalism is largely developed on the basis that the ribs are identical and are regularly attached. Although this assumption is restrictive, the formalism developed harbors a number of characteristics and phenomena that are often encountered in practice and, therefore, the restrictions do not demerit the formalism, but rather, help decipher a number of significant footprints in field-data. Thus, the formalism reveals that in the drive in lieu of the ribs characteristics of aliasing and the phenomenon of pass and stop bands is present. Moreover, the phenomenon of pass and stop bands is Complementarily exhibited in both the spectral and the spatial domains. This dual format is found to benefit the understanding and the interpretation of this phenomenon.