LOW FREQUENCY OSCILLATION OF A LARGE SCALE FLOATING BODY

Abstract

This study deals with a low frequency oscillation of a large scale rigid floating body. The oscillation due to first order short period waves of an order of 10s is small. However, new free low frequency waves appear both sides of the floating body if a second order (bound) low frequency waves are considered. Due to the free low frequency waves, together with the low frequency bound waves, the floating body shows an significant oscillation. In this study characteristics of the new free low frequency waves around the floating body and the oscillation induced by the wave is clarified. The mooring system, which reduce the low frequency oscillation in principle is also explained.