超大型浮体式構造物に働く変動漂流力の推定

概要

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It is important to estimate slowly varying drift forces on very large floating structures (VLFS), since it may be happen that slowly varying drift forces would have frequencies close to eigen frequencies of VLFS-mooring system. Considering with real seas, we should estimate slowly varying drift forces in multidirectional seas and, to carry out such estimations numerically, we may need large effort because of hydroelastic behaviors of VLFS. Firstly, we shall propose a method to evaluate slowly varying drift forces rather easily even in multidirectional seas. We show that it is possible to neglect contributions from bottom slopes of VLFS to slowly varying drift forces when deflections of VLFS are small compared with wave amplitudes. We validate the present method with model tests in long and short crested irregular waves. Finally, we estimated slowly varying wave drift forces on so-called Mega-Float Phase II Model with applying the method, i.e. with using measured relative wave height, and also we attempted to evaluate the incident wave from relative wave height. That is, this report shows the possibility of the estimation of slowly varying wave drift forces on VLFS from the incident waves.
独立行政法人海上技術安全研究所の論文
2003-11-14