長周期波作用下でのRoll共振動揺により誘発される港内係留船舶の長周期動揺特性について

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Recently, many studies on long-period waves induced by group of short-period waves through non-linear wave-wave interactions and free long waves have been done around the world. Also the problems on excessive motions of moored ships in harbor basins have been revealed in many harbors. It is well-known that the problems are caused by a resonant of both the natural period of surge and the long waves. However we found a different type problem where the long-period motions were induced by a resonant large roll motion during long waves where the waves from the outside harbor acted on the moored ship as almost beam seas. We have proposed the time domain analysis of moored ship motions in a harbor considering harbor oscillations in our previous work. The results of the field observation to accurate the simulation method were where the wave direction was near to head waves and the distance from the quay wall to ship hull was relatively large. In this paper, we conduct an another field observation for 45, 500DWT bulk carrier's ship motions moored at a quay wall in a harbor and investigate the long-period ship motions induced by the resonant large roll motion during long waves.
社団法人日本航海学会の論文
2001-03-25