A digital model for simulating the hydrodynamic and machinery response of a vessel while maneuvering is developed and tested for a variety of vessel forms. A set of four basic maneuvers is simulated for each vessel, and plots of predicted trajectory are produced and checked against model tests and/or ship trials for each of six ships. The model is constructed from three differential equations of motion, one differential equation of engine response, and three supporting equations. The coefficients of these equations are derived or approximated from a very minimal input description of the vessel. Finite depth effects have been omitted on this iteration, although the model has been constructed to accept such additions at a later date. The experimental results indicate that the model accurately distinguishes between dynamically stable and unstable ships (spiral test), and yields predicted trajectories which differ from trial results by 5% to 20%, depending on screw and rudder characteristics. Improved accuracy can be obtained by further refinement of the coefficient approximations. The input provided by this model for the complete traffic control simulation is presented in a diagram of the full traffic simulation model.

  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Ocean Engineering, 77 Massachusetts Avenue
    Cambridge, MA  United States  02139
  • Authors:
    • Patell, J M
  • Publication Date: 1972-5

Subject/Index Terms

Filing Info

  • Accession Number: 00044165
  • Record Type: Publication
  • Source Agency: Massachusetts Institute of Technology
  • Files: TRIS
  • Created Date: May 11 1973 12:00AM