2002•PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEANOpen access
DETACHABLE ROLL DAMPING DEVICE FOR MOORED SHIP
Masayoshi Kubo, Katsuhiko Saito, Shigeki SAKAKIBARA, Masashi Wakabayashi
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Abstract
Recently, many studies on long-period waves induced by group of short-period waves through nonlinearwave-wave interactions and free long waves have been done around the world. Also the problemson excessive motions of moored ships in harbor basins have been revealed in many harbors. It iswellknown that the problems are caused by a resonance of both the natural period of surge and the longwaves. However we found a different type problem where the long-period motions were induced by aresonant large roll motion during long waves where the waves from the outside harbor acted on themoored ship as almost beam seas. In this paper, we propose a convenient detachable roll damping devicefor moored ship which is kept at the berth and investigate the effect by water tank tests, field observationresults and a numerical simulation of moored ship motions.
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