高速コンテナ船の斜め波中におけるスラスト,トルク変動に関する模型実験 : L/B=8の1軸および2軸船について

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In the recent faster and larger container ship, hull form becomes more slender and number of propeller tends to increase from single screw to twin or triple screws, further to quadruple screws under planning, as the power of propulsion increases. For design of main engine of such a vessel it is necessary to estimate the sea margin of propulsion power enough to keep the designed ship speed in rough seas, because exact and periodical operations are especially important for a modern, high-speed container ship. In addition, severe fluctuations of thrust and torque induced by ship motions in waves will be one of the major reason that the master will be forced to reduce ship speed, i.e. the deliberate speed reduction, in order to prevent from the excitation of dangerous synchronism of vibrations of the propulsion system. This paper describes the test results on these problems, i.e. the mean increments and the fluctuation amplitudes of thrust and torque in oblique waves. The model tests were carried out in the Seakeeping tank of S.R.I, with a wide variation of wave length, heading angle and ship speed. Two tested models have the same L/B and B/d values, while the one is a single screw ship and the another is a twin screw ship. The results are obtained as follows: a) thrust and torque increases are remarkable in head and bow seas for both ships with small difference between weather and lee side propellers, b) thrust and torque fluctuate in different manner for both ships and for both sides of propellers. The fluctuations become larger in bow seas for single screw ship, while the larger fluctuations occur in quartering seas for the lee side propeller of the twin screw ship.
独立行政法人海上技術安全研究所の論文
1974-09-20

高速コンテナ船の斜め波中におけるスラスト,トルク変動に関する模型実験 : L/B=8の1軸および2軸船について

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