Testing Ship models in Transient Waves

Abstract

The seaworthiness characteristics of a ship design are often determined by a series of model tests in regular waves. This report describes a new model test procedure which makes use of a transient wave disturbance having energy distributed over all wave lengths of interest. With the use of this transient wave technique, the testing time required to characterize a model is reduced by an order of magnitude. In this report, the basic behavior of a unidirectional transient wave is discussed, and a simple Fourier transformation is developed to link wave height records measured at any two separated points along the path of such a wave. A particular form of transient wave, which is approximately sinusoidal with linearly varying frequency, has been used to test successfully a number of ship models. The results of these tests are presented and the practical problems in generating, measuring, and analyzing transient wave tests are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1966
Accession Number
AD0628440

Entities

People

  • Ernest E. Zarnick
  • Matthew C. Davis

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Computer Programs
  • Computers
  • Fourier Analysis
  • Frequency Bands
  • Integrals
  • Linear Systems
  • Mathematics
  • Model Basins
  • Model Tests
  • Resonant Frequency
  • Ship Model Basins
  • Systems Analysis
  • Two Dimensional
  • Water Waves
  • Wave Power
  • Waveforms

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Control Systems Engineering.
  • Psychometric Testing or Psychological Assessment.