Component Local Velocities of a Ship along a Defined Axis

Abstract

Enhancements to the PAT-86 suite of ship motion computer programs are anticipated shortly. An addition will be an option that calculates the local RMS motions when viewed along a defined axis. This memorandum records the theory involved and its subsequent inclusion into PAT-91. An example is also shown. The memorandum outlines a method of calculating the component local velocities along a given axis when the ship is travelling at forward speed in long crested waves. The results as presented appear reasonable and illustrate expected trends. The TM considered only RMS velocities along an axis and did not consider motions perpendicular to the defined axis. The PAT suite neglects surge. This means that the translation velocity may be inaccurate especially in following seas.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1991
Accession Number
ADA236418

Entities

People

  • A. R. Lloyd
  • P. Crossland

Organizations

  • Admiralty Research Establishment

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Amplitude
  • Classification
  • Computer Programs
  • Computers
  • Coordinate Systems
  • Copyrights
  • Elevation
  • Foreign Languages
  • Inclusions
  • Language
  • Lepidoptera
  • Security
  • Ship Motion
  • Translations

Readers

  • Calculus or Mathematical Analysis
  • Computer Science.
  • Marine Hydrodynamics