Accession Number : AD0726765

Title :   On the Possibility of Observing Nonlinear Effects in the Vibrations of Cylindrical Shells in Vacuo or Submerged.

Descriptive Note : Technical rept.,

Corporate Author : COLUMBIA UNIV NEW YORK DEPT OF CIVIL ENGINEERING AND ENGINEERING MECHANICS

Personal Author(s) : Bleich,Hans H.

Report Date : JUN 1971

Pagination or Media Count : 21

Abstract : An extensive nonlinear analysis in a preceding report is applied qualitatively to predict circumstances where 'unusual' responses in forced vibrations of shells, in vacuo or submerged, may be observable. It is concluded that due to unavoidable structural damping, unusual effects in vacuo will be unobservable except in lobar modes with large n, say n greater than 6, and for longitudinal nodal distances of L/R much greater than 1. Even in these cases the structures must be stressed to a considerable fraction, say 1/2, of yield. In submerged shells radiation damping is added to the structural one, reducing the observable range somewhat further. Except in marginal cases, the unusual effects should be observable in submerged cases whenever they can be found in vacuo. (Author)

Descriptors :   (*SHELLS(STRUCTURAL FORMS), VIBRATION), CYLINDRICAL BODIES, UNDERWATER, VACUUM, NONLINEAR SYSTEMS, DAMPING, EXCITATION, RESONANT FREQUENCY

Subject Categories : Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE