Prediction of Motions of SWATH Ships in Following Seas.

Abstract

To predict motions of SWATH ships in following seas, especially when the encounter frequency is small, unified slender-body theory has been applied. The longitudinal interaction term is computed and added to the results of the strip theory as a correction term. The added mass coefficients are computed to be much larger than those from strip theory, while damping coefficients are slightly less than two-dimensional results. There is improvement for heave motion for a limited range of frequencies, but the pitch motion is generally poor. To improve these results, further, the two-dimensional potential should be solved by the multipole expansion method rather than by the Frank close-fit method. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1981
Accession Number
ADA107723

Entities

People

  • Young S. Hong

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Amplitude
  • Bessel Functions
  • Bodies
  • Coordinate Systems
  • Differential Equations
  • Equations
  • Excitation
  • Frequency
  • Geometric Forms
  • Integral Equations
  • Integrals
  • Moment Of Inertia
  • Oscillation
  • Slender Bodies
  • Swath Ships
  • Three Dimensional
  • Two Dimensional

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Marine Hydrodynamics