A CALCULATION OF TURNING MOTION IN REGULAR WAVES

A ship progressing in waves performs heaving, pitching, rolling, yawing, swaying, and drifting motion due to the dynamic forces of waves, and these motions affect the manoeuvrability of the ship. L.J. Rydill investigated the steered motion of a ship in regular waves using the linear theory, in consideration of the periodic lateral force and yawing moment as originally assumed by W. Froude. But a ship is drifted in direction of the wave propagation due to the phase lag between the exciting force of waves and the ship motions as shown by Y. Watanabe. In this paper the authors investigated the influence of drifting force on the course keeping and the turning of the ship. Main conclusions are as follows: (1) A ship progressing in waves has a tendency to turn to the weatherside due to the drifting force, and the greater its deviation is, the less the dynamic stability of the ship. (2) The effects of the drifting force is illustrated by a mathematical model and (3) A locus of turning ship in relatively gentle waves is nearly the same as that in calm water.

  • Corporate Authors:

    West Japan Society of Naval Architects

    Kyushu University, Hakozaki C-10-1, Higashi-ku
    Fukuoka-shi,   Japan 
  • Authors:
    • Inoue, S
    • Murahashi, T
  • Publication Date: 1965-10

Media Info

  • Pagination: n.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00323613
  • Record Type: Publication
  • Source Agency: Stevens Institute of Technology
  • Files: TRIS
  • Created Date: Nov 19 1980 12:00AM