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RESEARCH PAPERS: Offshore Mechanics/Ocean Engineering/Arctic Engineering

Energy Losses due to Limit-Cycle Behavior of a Large Tanker Under Automatic Steering Control

[+] Author and Article Information
R. E. Reid, M. Youhanaie

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, Ill. 61801

J. Energy Resour. Technol 105(2), 222-229 (Jun 01, 1983) (8 pages) doi:10.1115/1.3230907 History: Received December 01, 1981; Revised December 22, 1982; Online October 22, 2009

Abstract

The problem of limit-cycle behavior of a 250,000-dwt tanker in full-load and ballast conditions under automatic steering control in calm water is addressed. The approach presented involves digital computer time domain simulation studies of the yaw-sway-surge-rudder coupled motions of the ship emanating from nonlinearities in the steering system. It is shown that the amplitude of limit cycle in yaw remains, in general, within acceptable limits for open-seas navigation for a fairly wide range of autopilot bandwidths. Propulsion losses resulting from limit-cycle behavior in calm water are shown also to be, in general, small relative to the losses experienced in some conditions in waves. It is shown, however, that whereas increasing bandwidth reduces limit-cycle behavior in calm water, it can be expected to increase propulsion losses in heavy weather. The problem this poses in. design of steering gear controls and autopilot for this type of ship is discussed.

Copyright © 1983 by ASME
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