形状影響係数の簡易推定法を用いた船型最適化手法 : 粘性抵抗の低減を目的とした船型改良

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  • An Optimization Method for Full Form Ships Using a Simple Prediction of the Form Factor
  • ケイジョウ エイキョウ ケイスウ ノ カンイ スイテイホウ オ モチイタ センケイ サイテキカ シュホウ ネンセイ テイコウ ノ テイゲン オ モクテキ ト シタ センケイ カイリョウ

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Minimum resistance is one of the most important factors in hull from design. Traditionally, hull from design is dependant upon the skills of highly experienced naval architects. If a completed optimization method of hull design with minimum resistance could be developed, design time would be shorted dramatically and this method would help the naval architect who doesn't have much experience. Recently, some optimization methods using CFD for minimum resistance have been developed. However these methods need long computation time. In the practical design stage, a design time is needed. So we aim to develop an optimization method requiring less time. In this paper, we focus on the optimization of hull form design for minimization of viscous resistance. Viscous resistance takes the greater part of resistance in full hull from (for example VLCC, Bulk Carrier etc. ) So, reducing viscous resistance is very important in designing full hull from. The object of our optimization method is to achieve a hull from with minimum viscous resistance. Our optimization method consists of Nonlinear Programming, Deformation method for hull form, and Prediction method for viscous resistance that can predict the form factor quickly. Our method optimizes in a frame lime for minimum viscous resistance and can obtain results for short time (about 4〜6 hours on PC.) This method directly optimizes the hull from. The result of this optimization is shown in this paper. And we verified the results by comparing with the resistance test in NKK TSU SHIP MODEL BASIN.

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