An Effective Method to Reduce the Motion of Moored Floating Vessel

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  • 係留浮体の動揺低減方法とその性能
  • ケイリュウ フタイ ノ ドウヨウ テイゲン ホウホウ ト ソノ セイノウ

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A method to reduce the slow drift oscillation of moored vessels due to winds and waves was considered. A sliding block on a sea-bed is connected by a spring with the moored vessel. Coulomb friction between the block and the sea-bed is expected to reduce the vessel motion. Experimental tests of an idealized model excited by sinusoidal forces were carried out. And numerical simulations by Runge-Kutta-Gill method,availability of which had been confirmed for the case of the experiments, ware done for an actual model excited by irregular wind forces. The following conclusions were obtained. (1) The effect of reducing the vessel motion due to this method exists surely, and it is remarkable one. (2) The reducing effect is influenced by not the mass of block,but the friction and the connecting spring. (3) There is the optimum ratio of friction force to exciting force to minimize the vessel motion.

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