A LINEAR THEORY OF SHIP MOTION IN IRREGULAR WAVES

Abstract

An analysis was made of the heaving and pitching motions of unpropelled ship models in irregular bow and stern seas. A knowledge of the water- surface history at 1 station along the model and a Fourier integral analysis were used to obtain time histories of the motions in terms of convolution-type integrals of the motion and a kernel function. The latter was the Fourier transform of the response to a sinusoidal forcing function. The Froude-Kriloff hypothesis was used to compute kernels for oscillations of a rectangular block. The kernel for a model of ship form was determined from experiments with sinusoidal and irregular waves. Predicted and recorded time histories showed good agreement.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1953
Accession Number
AD0017823

Entities

People

  • R.a. Fuchs
  • R.c. Maccamy

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Amplitude
  • California
  • Convolution Integrals
  • Elevation
  • Engineering
  • Equations
  • Fourier Analysis
  • Frequency
  • Inertia
  • Integrals
  • Kernel Functions
  • Moment Of Inertia
  • Power Spectra
  • Relative Motion
  • Ship Models
  • Ship Motion
  • Spectra

Fields of Study

  • Engineering

Readers

  • Calculus or Mathematical Analysis
  • Marine Hydrodynamics