AUTOMATIC CONTROL SYSTEMS FOR LONGITUDINAL MOTION OF SEMISUBMERGED SHIPS

Optimal control theory is used to develop three automatic control systems for the longitudinal motion of a semisubmerged ship. A linearized mathematical model of the ship motion is used and the control problem is treated as a linear regulator. Simulations of the ship's longitudinal motions, utilizing the three control systems, are compared for various sea conditions. It is concluded that if the wave forces and moments are known or are estimated as functions of time, a suboptimal controller is the best controller. However, if a frequency domain approach is used to estimate the wave forces and moments, the complexity of a suboptimal controller approaches that of an optimal controller and the difference between the two is negligible. (Author)

• Corporate Authors:

  Naval Postgraduate School

  1 University Circle
  Monterey, CA  United States  93943
• Authors:
  • Monell Jr, G F
• Publication Date: 1972-9

Media Info

• Pagination: 113 p.

Subject/Index Terms

• TRT Terms: Automatic control; Design; Hydrofoil boats; Loads; Semisubmersibles; Ship motion; Submersibles; Waves
• Old TRIS Terms: Automatic control systems; Design process; Hydrofoil craft; Wave induced loads
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00043220
• Record Type: Publication
• Source Agency: National Technical Information Service
• Files: TRIS
• Created Date: Apr 6 1973 12:00AM