RESEARCH PAPERS: Offshore Mechanics/Ocean Engineering

Stability Considerations for Existing Conventional Autopilots on Modern Ship Types

[+] Author and Article Information
R. E. Reid, D. E. Griffin

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

J. Energy Resour. Technol 106(1), 88-95 (Mar 01, 1984) (8 pages) doi:10.1115/1.3231030 History: Received September 20, 1982; Revised June 24, 1983; Online October 22, 2009


The directional stability of three modern ship types with conventional nonadaptive autopilots is examined. It is shown that while attempting to improve the course-keeping ability of these ships, the potential exists for the operator to unknowingly cause a loss of directional stability with the controls available to him. Stable controller settings are established to prevent such an occurrence. The results of a design method allowing optimization of the autopilot to achieve a desired degree of stability controllability versus steering-induced added resistance is also presented.

Copyright © 1984 by ASME
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