A STUDY OF THE STABILITY OF SHIP NON-STEADY MANOEUVRING MOTION

The stability of ship transient maneuvers was studied--primarily, the unsteady phase of turning maneuvers. Computer simulations for a relatively full nondimensional mathematical model of lateral motion showed that even unstable (in a common sense) ships exhibit asymptotically stable transients. On the other hand, for very unstable ships, there is a considerable rise in the initial levels of perturbations at the beginnings of transients generated by small rudder orders. An approximate analytical treatment of the same problem was also carried out on the basis of the well-known first- order mathematical model of a ship, enabling evaluation of the explicit relations between the level of perturbation overshoot and the generally-accepted parameter of ship inherent instability. A new approach for standardizing the admissible values of this parameter is presented, one that may in some cases lead to less strict standards and be useful in the design of large and very full vessels when common standards are difficult to meet.

Media Info

  • Features: References;
  • Pagination: 8p.

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Filing Info

  • Accession Number: 00660667
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM