Hydroelastic Behavior of a Long Flexible Structure in Irregular Waves

A simple 2D analysis on a long flexible structure, which is used for the floating type offshore wind power plant, has been performed to know the basic hydroelastic behavior of the structure. The method is not time consuming to cover wide-range combinations of the incident angle and the period. Using this method, the hydroelastic behavior of the structure in oblique irregular waves is investigated. It is found that the high stress region is very sensitive for the variation of the wave direction and the period. The variance of the stress is dramatically reduced, if we take the effect of the wave short-crestedness into account. The estimation of the long term stochastic property and the fatigue damage assessment has been also performed. It is found that the wave short-crestedness plays an important roll to lower the fatigue damage.