The conventional method of estimating the upper limit of wind velocity at which a ship is manoeuvrable is by the solution of equilibrium equations of steady ship motion, but the method is not realistic because the steered motion of a ship in wind is unsteady. In this study, the Authors investigate the manoeuvrability of a ship in wind both by solving non-linear equations of motion numerically (with a digital computer) and by carrying out a steering test with a manoeuvring simulator. From these investigations, a more realistic upper limit of wind velocity is obtained. By comparing this value with that estimated by equilibrium equations, it is shown that, in the beam and quarter winds that are most difficult in ship manoeuvring, this realistic upper limit of wind velocity is nearly equal to the limit estimated by the equilibrium equations of steady motion for a ship whose rudder angle is kept at 15 deg. By using this relationship, the upper limit of wind velocity for several ships of different types is shown graphically in the article. The effects of shallow water, rudder area, waves, uniform current, and fluctuating wind, upon the upper limit of wind velocity, are also discussed. Order from BSRA as No. 54,224.

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  • Corporate Authors:

    Kansai Zosen Kyokai, Osaka University

    Aza-yamadaue, Suitashi
    Osaka,   Japan 
  • Authors:
    • TANAKA, A
  • Publication Date: 1980-3


  • Japanese

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Filing Info

  • Accession Number: 00323283
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM