Accession Number : AD0643240

Title :   ELASTIC VIBRATION CHARACTERISTICS OF CANTILEVER PLATES IN WATER.

Descriptive Note : Technical rept.,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TEX DEPT OF MECHANICAL SCIENCES

Personal Author(s) : Lindholm,Ulric S. ; Kana,Daniel D. ; Chu,Wen-Hwa ; Abramson,H. Norman

Report Date : AUG 1962

Pagination or Media Count : 50

Abstract : The presence of the liquid free surface has a significant effect upon the dynamic plate characteristics (frequencies) only when the surface is less than about one-half span length from the plate. The effect of the liquid free surface on the resonant frequency of a vertical surface peircing plate is highly dependent upon the relationship between the depth of immersion of the plate and the mode of vibration. The overall damping of cantilever plate vibration is increased significantly in water as compared with air. The results of this study would indicate that for those problem areas in the field of Naval dynamics wherein elastic plate vibrations are involved, and for which predictions of resonant frequencies and damping factors are derived, knowledge is either inadequate or unavailable. For cantilever plates, the present results should enable one to predict resonant frequencies in practical applications with some degree of confidence; but damping factors have been obtained only to within order-of-magnitude and to show trends. Clearly, similar information is very much needed for other plate geometries (i.e., skewed) and support conditions.

Descriptors :   (*METAL PLATES, VIBRATION), (*FLUID DYNAMICS, METAL PLATES), ELASTIC PROPERTIES, HYDRODYNAMICS, WATER, RECTANGULAR BODIES, RESONANT FREQUENCY, DAMPING, EXPERIMENTAL DATA, THICKNESS

Subject Categories : Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE