It is well-known that auto pilots now used on many ships cause yawing with a prolonged periodicity which has an unfavourable effect on propulsive energy. Energy loss during navigation of a ship is closely related with yaw motion and can be reduced by suitable steering. An analysis of ship motion shows that propulsive energy required for navigation can be estimated by using ship characteristics, manoeuvring performance and propulsive performance. On the basis of this estimation method, an index of energy loss was introduced as the criterion for the adaptive auto pilot system. The adaptive auto pilot system aims at energy saving during navigation of a ship and has the following features. 1. It automatically optimizes control gain so as to minimize energy loss. 2. It removes the high frequency component of waves which has an unfavorable effect on propulsive energy. 3. Having the function of monitoring environmental conditions, it automatically adjusts the optimum control gain and filter gain, adapting itself to changes in environments. A simulation test using the prototype system has proved that the adaptive auto pilot system not only optimizes energy saving, but also assures a good course stability performance, having a high adaptability to changing environments. Order from BSRA as No. 54,944.

  • Supplemental Notes:
    • Proceedings of the 3rd IFIP/IFAL Symposium on Ship Operation Automation, Tokyo, 26-29 November 1979.
  • Corporate Authors:

    International Federation of Automatic Control

    Faculty of Engineering, Kyoto University
    Kyoto 606,   Japan 

    International Federation of Automatic Control, Laxenburg (Austria); International Federation for Information Processing, Geneva (Switzerland)

  • Authors:
    • Kanamaru, H
    • Sato, T
  • Conference:
  • Publication Date: 1979

Media Info

  • Features: References;
  • Pagination: p. 131

Subject/Index Terms

Filing Info

  • Accession Number: 00331569
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Conf Proc.
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM