The Unified Theory of Ship Motions,

Abstract

A linear theory is presented for the heave and pitch motions of a slender ship, moving with forward velocity in calm water. The velocity potential includes a particular solution similar to that of the high-frequency strip theory, plus a homogeneous component which accounts for interactions along the length in an analogous manner to the low-frequency 'ordinary' slender body theory. The resulting 'unified' theory is valid more generally for all frequencies of practical importance. Computations are presented for the added-mass and damping coefficients of a floating spheroid, a Series 60 hull, and a frigate. Comparisons with experimental data and with zero-speed exact theories confirm the utility of the unified theory. This theory can be used to analyse the performance of elongated wave-energy absorbers. This application is illustrated for a hinged 'Cockerell' raft.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1980
Accession Number
ADA090051

Entities

People

  • J. Nicholas Newman
  • P. Sclavounos

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Doppler Effect
  • Engineering
  • Experimental Data
  • Frequency
  • Hydrodynamics
  • Integral Equations
  • Massachusetts
  • Ship Hulls
  • Ship Motion
  • Slender Bodies
  • Standing Waves
  • Surface Properties
  • Three Dimensional
  • Two Dimensional
  • Universities
  • Wave Power
  • Waves

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Calculus or Mathematical Analysis
  • Marine Hydrodynamics