不規則波中での変動漂流力と係留浮体の左右揺に関する一計算

概要

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The fact that the sway motion of moored vessel is not symmetrical about the mean position is shown in this paper. For the design of mooring system, it is of great importance to study such an asymmetrical phenomenon because the sway motion affects mooring forces strongly. The vessel is moored at sea with a linear spring. Wave forces are calculated by the pressure integration over the wetted surface up to the wave surface. Then the sway, which consists of wave period motion due to 1st order wave force and slow drift motion due to 2nd order one, is simulated numerically. Statistical property of time history of sway is investigated. The following emerge: (1) The degree of asymmetry of the motion is affected by hardness of the spring and magnitude of the hydrodynamic damping force. (2) When the slow drift motion is the same order with the wave period motion, the degree of asymmetry becomes large. (3) When the slow drift motion becomes fairly large comparing with the wave period motion, the asymmetry vanishes and the maximum of sway becomes smaller than the theoretical extream value for Gaussian process.
社団法人日本船舶海洋工学会の論文
1984-09-30