OPTIMUM STEERING OF SHIPS WITH AN ADAPTIVE AUTOPILOT
During the last decades adaptive control has received much attention from control engineers. Also in the field of automatic steering of ships, attempts to design an adaptive autopilot for ships have been made. Microprocessor technology has enabled the practical application of these control structures, which until recently, were mainly of interest on a laboratory scale. In this paper an adaptive autopilot has been designed based on model reference adaptive control, which is able to realize an optimum behaviour of the ship steering system, under varying circumstances. Just as in many other cases, one of the main problems to be solved is the question what has to be considered as an optimum behaviour. This paper discusses criteria for optimum steering, for manoeuvring as well as for course keeping. Technical aspects, considering the fuel economy etc. are taken into account. Besides, the formulation of these criteria is based on the results of an inquiry among officers of the Royal Netherlands Navy and the Dutch Merchant Navy. The results of this study have been implemented in an autopilot which adapts itself, in order to maintain an optimum performance, notwithstanding changing circumstances, such as speed variations and changing sea state and wind. It is also taken into account that the performance criterion itself depends upon the circumstances (e.g. very accurate steering versus fuel economy). The possibilities to adjust the autopilot are limited to those settings which are really of interest to the officer of the watch, thus omitting the conventional settings which have no clear and meaningful relation with the steering of the ship.
- Proceedings Fifth Ship Control Systems Symposium, David W. Taylor Naval Ship Research and Development Center, Annapolis, Maryland, October 30-November 3, 1978, Volume 3.
David Taylor Naval Ship R&D CenterBethesda, MD USA 20084
- Van Amerongen, J
- van Nauta Lemke, H R
- Publication Date: 1978
- Features: References;
- Pagination: 15 p.
- TRT Terms: Automatic pilot; Automatic pilot; Automatic steering control; Maneuvering; Optimization; Pilotage; Ship motion; Steering
- Old TRIS Terms: Course keeping qualities; Model testing; Steering characteristics
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- Accession Number: 00187962
- Record Type: Publication
- Source Agency: David Taylor Naval Ship R&D Center
- Report/Paper Numbers: Proceeding
- Files: TRIS
- Created Date: Feb 3 1979 12:00AM