FURTHER INVESTIGATIONS ON THE COMPUTER PROGRAM SYSTEM FOR THEORETICAL CALCULATION OF SEAKEEPING QUALITY OF SHIPS

This paper, contributed by Mitsu Engineering & Shipbuilding, is a continuation of a previous one in which a method, based on the "new" strip method, for the theoretical calculation of seakeeping quality was described and the computer program system developed for the calculations was outlined. In the present paper, which gives further information on this program system, results obtained with the system are compared with those from the "ordinary" strip method, and from model tests, for a single-screw container-ship of 175 m length b.p. The calculations were confined to ship motions, accelerations, relative motions, and their statistical prediction for short and long terms (matters such as fluctuating pressure on the hull surface, shear force, and bending moment will be dealt with at a later date). Similar calculations were also carried out for a triple-screw container-ship (the Elbe Marw) and a 270,000-dwt tanker; these calculations, described as tentative, were made to investigate further the scope and practicability of the calculation system. The results of the various calculations, and comparisons with model results, are presented graphically and discussed. Aggreement with the model results was generally good in respect of seakeeping quality, and the method is considered to be applicable to practical design problems. Several advantages of the calculation system are listed, and it is mentioned that the system will need modification in the future to embody advanced theories and so improve the calculation accuracy. Order from: BSRA as No. 48,330.

  • Corporate Authors:

    Japan Association for Technical Information

    4-7-107, Yamazaki-cho, Machida City
    Tokyo 194-01,   Japan 
  • Publication Date: 1977

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Filing Info

  • Accession Number: 00178200
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 19 1978 12:00AM