船体構造の最適設計に関する研究(第3報) : タンカーの縦強度部材の最適設計

概要

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In regard to oil tankers of apploximately 130-250 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 1〜3%. 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 kg/mm^2 high tensile steel is used combined with mild steel, steel weight decreases by about 12%, while steel cost remains almost unchanged.
社団法人日本船舶海洋工学会の論文