Recent advances in the research of ship motion in a seaway have allowed the prediction of ship motions. These researches, however, are restricted to those of displacement type ships such as a merchant ship and a destroyer, and as to the behavior of high speed planing boats in a seaway few available researches have been published. In the present study a towing tank test of a torpedo boat model was carried out in regular head waves and experimental data were discussed along with the results calculated by Ordinary Linear Strip Method (O.S.M.). The conclusions deduced from these studies are as follows, 1) High frequency components appear in pitching and heaving oscillations at higher encounter frequency, that is, at higher speed and shorter wave. In these regions, each mean value of the pitching and heaving oscillation becomes larger compared with the trim angle and vertical displacement in still water. 2) The motions calculated by the O.S.M. give good agreement with experimental data for Froude numbers less then 0.5, but they do not always for higher Froude number. 3) In spite of much higher frequency components in the motions, the amplitudes of pitching and heaving motions are almost proportional to those of the wave, that is, the linearity to wave height is nearly conserved.

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  • Corporate Authors:

    Society of Naval Architects of Japan

    23 Shiba-kotohiracho, Minato-ku
    Tokyo 135,   Japan 

    Society of Naval Architects of Japan

    15-16, Toranomon, 1-chome, Minato-ku
    Tokyo,   Japan 
  • Authors:
    • Bessho, M
    • Komatsu, M
    • Anjoh, M
  • Publication Date: 1974-6


  • Japanese

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Filing Info

  • Accession Number: 00071548
  • Record Type: Publication
  • Source Agency: Society of Naval Architects of Japan
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM