Ship Motions and Capsizing in Astern Seas

Abstract

An analytical and experimental study of ship motions and capsizing in extreme seas has been conducted. The analysis of linear and quasi-linear one- dimensional roll models has revealed motion anomalies not apparent from the usual linearized ship motion theory. Extensive tests have been conducted using two radio-controlled models in the wind generated seas of San Francisco Bay. Directional spectra were computed, using a variety of techniques, from the wave measurements by an array of wave gages. Comparisons of the experimentally determined motions and a linear strip theory prediction are presented. A time domain numerical simulation program for motions and capsizing has been used to investigate motions in a variety of wave group configurations. The results show good agreement with observed capsizing phenomena and have revealed a number of important characteristics associated with large geometry changes in waves.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1974
Accession Number
ADA012495

Entities

People

  • J. R. Paulling
  • O. H. Oakley Jr.
  • P. D. Wood
  • R. Van Slyke
  • S. J. Chou

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Computational Science
  • Data Science
  • Databases
  • Differential Equations
  • Diffraction
  • Engineers
  • Geometry
  • Information Science
  • Measurement
  • Naval Architecture
  • Plastic Explosives
  • Resonant Frequency
  • San Francisco Bay
  • Statistical Analysis
  • Three Dimensional
  • Two Dimensional
  • Waveforms

Fields of Study

  • Physics

Readers

  • Marine Hydrodynamics
  • Oceanography.