Abstract
In order to realize a floating offshore wind turbin system, it is necessary to examine the dynamic response characteristics of the floating foundation. In this study, we present a method for estimating the dynamic stability of a spar platform in regular waves by applying the Hsu's method (1963). The presented method enables us to estimate the wave frequency at which the parametric resonance may occur as a multiple degrees of freedom system. In addition, we investigate the validity of this method by numericalcal analysis and experiments.
