Vertical Plane and Roll Motion Stabilization of SWATH Ships

Abstract

A method has been developed to rapidly assess the effects of active fins on the vertical motions (platforming and contouring modes) and/or the roll motion of a SWATH ship in waves. The method combines Linear Quadratic Theory (LQT) of optimal control for obtaining the fin control law with the SWATH seakeeping Evaluation Program (SSEP). The nonlinearities produced by the fin angle and fin rate saturation are approximated by placing limiting values on their corresponding values in a seaway. This permits frequency domain computations of the stabilized motions which is more consistent with LQT and more cost effective than those computed in the time domain. A description of the procedure and sample results are provided.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1986
Accession Number
ADA172114

Entities

People

  • David W Taylor
  • Ernest E. Zarnick

Tags

Communities of Interest

  • Cyber
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Classification
  • Computations
  • Control Systems
  • Differential Equations
  • Equations
  • Equations Of Motion
  • Frequency
  • Frequency Domain
  • Geometry
  • Seakeeping
  • Security
  • Ship Design
  • Ships
  • Swath Ships
  • Test And Evaluation
  • Time Domain

Readers

  • Marine Hydrodynamics
  • Operations Research
  • Robotics and Automation.