COMPUTER-AIDED DESIGN OF AUTOPILOTS FOR SURFACE SHIPS

A simplified mathematical model is used which contains coefficients that can be determined from sea-trials using given helm-angle forcing functions and measurement of ship yaw-rate responses. For larger rudder-signals it is found necessary to include nonlinearity in the ship dynamics which can also be determined from the sea-trials. Inclusion of the non-linearity prevents direct use of conventional graphical control systems analysis. Feedback of yaw-angle data from the ship's gyro-compass is used to give suitable steering transient response. In the single-loop considered the nonlinearity is associated with linear dynamics which gives a frequency-dependent describing-function for use with a gain-phase plot analogous to the Nichols chart for linear systems.

  • Supplemental Notes:
    • Prepared for IEEE Meeting, Southampton University, Hamps, England, April 8-11, 1974.
  • Corporate Authors:

    Institution of Electrical Engineers

    Savoy Place
    London WC2R 0BL, NY  England  10016-5997
  • Authors:
    • Linkens, D A
    • Clark, A S
  • Publication Date: 1974

Media Info

  • Features: References;
  • Pagination: p. 70-75
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00128735
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jan 14 1976 12:00AM