Abstract
In this paper, the hull construction cost of one tank hold length in the midship segment of double hull tanker is taken as the objective function to be minimized by the internal penalty method and the multiplier method based on plastic design. Emphases of this study are placed on the cost minimization compared with the weight minimization and the hull construction cost varied with the number of transverse ring spaces as well as the result comparison between the internal penalty method and the multiplier method. Through the numerical analysis, it has been found that : (1) The weight minimization is more costly than the cost minimization. It is suggested that the cost minimization is the first choice for structural optimum design of double hull tanker except the case that there is a special limitation on the weight.(2) Similar to weight minimization reported by Ref. 1), there is also a proper number of transverse ring spaces that makes the total construction cost get the minimum value.(3) Since the multiplier method has good convergence and numerical stability, it can be taken as a practical method for engineering optimum designs.
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