STUDIES ON OPTIMIZATION OF SHIP STRUCTURES. (3RD REPORT) OPTIMUM DESIGN OF LONGITUDINAL MEMBERS OF A TANKER

In regard to oil tankers of approximately 130 to 250 thousand ton deadweight, optimum design of longitudinal strength members is undertaken. Ship size, main proportion, transverse web space and so forth are varied. Rule requirement specified by the ship classification society of Japan is adopted as standard for design. A kind of nonlinear programming techniques, SUMT is used for numerical search. By some numerical results obtained, trends of optimum longitudinal frame space, frame area and plate thickness are examined. Furthermore the influence of using high tensile steel combined with mild steel and that of taking account of fabrication cost are studied. Main conclusions are as follows: I. In comparison with actual design, optimum longitudinal frame space, frame area and bottom plate thickness are larger, hence steel weight of midship section decreases by 1 to 3 percent. II. As ship size increases, both longitudinal member size and steel weight of midship section increases, however steel weight per cargo space decreases. III. When 50 Kilogram per Millimeter Squared high tensile steel is used combined with mild steel, steel weight decreases by about 12 percent while steel cost remains almost unchanged.

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    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:
    • Kitamura, K
  • Publication Date: 1972-12

Language

  • Japanese

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Filing Info

  • Accession Number: 00072514
  • Record Type: Publication
  • Source Agency: Society of Naval Architects of Japan
  • Files: TRIS
  • Created Date: Dec 19 1974 12:00AM