Accession Number : AD0618673

Title :   THREE-DIMENSIONAL (BEAM-SHELL-SPRUNG BODY) VIBRATION ANALYSIS OF NS SAVANNAH,

Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON D C

Personal Author(s) : LEIBOWITZ,Ralph C. ; Schwendler,Robert G.

Report Date : APR 1965

Pagination or Media Count : 135

Abstract : The normal modes of coupled vertical, transverse, and longitudinal flexural vibrations and the steadystate damped response were calculated by means of a passive electrical-analog computer for surface ship NS SAVANNAH using a three-dimensional (beam-shellsprung body) analysis similar to that applied to aircraft. This ship was selected as a case study because of the many test results, data, and calculations available for this ship. Vertical flexural vibrations based upon beam theory were also computed by a digital computer. To demonstrate the techniques involved in making a threedimensional analysis, the methods and data used in the calculations and the results obtained are presented. Results show that significant reductions in vibration amplitudes can be achieved by such methods as damping or inertia coupling, which directly affect the sharpness of the structural resonance peaks. (Author)

Descriptors :   (*SHIP HULLS, VIBRATION), (*CARGO SHIPS, VIBRATION), (*NUCLEAR POWERED SHIPS, VIBRATION), BEAMS(STRUCTURAL), MATHEMATICAL ANALYSIS, DIGITAL COMPUTERS, DAMPING, GRAPHICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE