ON THE STEADY TURNING OF TOWED SHIP SYSTEM, PART II

The steady turning motion of the towed ships system was discussd in JSNA No. 137. This paper again discusses the turning of the towed ships system by the parameters as used in No. 137 and the additional parameter K (radius of gyration of ship), the results are as follows: 1) When steered by the rudder of the tugboat, the effects of the fore-towing point, towing ropes length and the towed ships are small and it can be neglected, and those values are given in the paper. 2) The larger the rudder angle and the rudder area ratio of the tugboat, the smaller the values of A sub d, T sub r and T sub od. 3) As the rudder angle and rudder area of the tugboat are constant, a). the values of A sub d, T sub r and T sub od decrease, when the number of towed ships increases, b). because of the increase of the radius of steady turning, these values become larger, when the towing points are placed apart from the centre of gravity of the towed ship, except the last towed ship. c) the effects of the derivatives of towed ships are included. d). the effect of radius of gyration of tugboat itself is large, when the value of radius of tugboat increase, the values of A sub d, T sub r and T sub od grow large, and the effect of radius of gyration of the towed ship is small and negligible.

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    Society of Naval Architects of Japan

    15-16, Toranomon, 1-chome, Minato-ku
    Tokyo,   Japan 

    Society of Naval Architects of Japan

    15-16, Toranomon, 1-chome, Minato-ku
    Tokyo,   Japan 
  • Authors:
    • Lim, S T
  • Publication Date: 1975

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  • Accession Number: 00323647
  • Record Type: Publication
  • Source Agency: Stevens Institute of Technology
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM