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

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)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1965
Accession Number
AD0618673

Entities

People

  • Ralph C. Leibowitz
  • Robert G. Schwendler

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Amplitude
  • Analog Computers
  • Case Studies
  • Computers
  • Computing Devices
  • Couplings
  • Digital Computers
  • Resonance
  • Savannahs
  • Sharpness
  • Three Dimensional
  • Vibration

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Structural Dynamics.