On the Rolling of a Ship on a Billow : 2nd Report : Transient Rolling Motion

Abstract

The ship behavior on a billow with a extreme wave height can not be known sufficiently because of the non-linearity of various factors. To study the outline of the first roll of a ship in this case, the experimental research is carried out in the water tank using box-shaped models. The rolling features and the relation between the model stability and the rolling amplitude [θ_<al>]_m are shown. From the investigation of these results and the heeling moments measured, it is seen that the heeling moment due to a breaking billow is caused not only by wave slope but by the break of wave crest.