双胴船の造波抵抗低減の一試み : 実数値遺伝的アルゴリズムによる船型改良

概要

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In this paper, we try to reduce the wavemaking resistance of catamaran according to a hull form improvement procedure. In the procedure, a weight function including some design parameters is multiplied to the initial hull surface in order to represent an improved hull surface. Objective function is the wavemaking resistance coefficient that is obtained by dividing the wave-making resistance by the square of the ship length. Rankine source method is employed to evaluate the wavemaking resistance of catamaran. As the optimization method, we adopt the real-coded genetic algorithm using the Unimodal Normal Distribution Crossover (UNDX). In the present study, we select the Wigley hull as the initial hull form. Initial catamarans are assumed combining two Wigley hulls for two cases of transverse distance between each hull. Numerical calculations are conducted for two Froude numbers. Improved hull forms and the values of wavamaking resistance are shown in each case.
2004-03-20