PRECIS PREDICTION METHOD FOR BEHAVIOR OF VERY LARGE FLOATING STRUCTURE IN WIND,CURRENT AND WAVES

本研究的主要目的是：开发高精度的超大型浮式结构物在自然环境条件下的时域模拟器，建立超大型浮式结构物在建造过程中的全寿命安全性和可操作性评价体系，自然环境条件包括多向不规则波浪、脉动风、脉动流和海冲击。研究内容包括浮体的弹性变形、压力分布、内部载荷和系泊缆载荷，以及浮体周围的波浪场、浮体上的漂流力和低频振荡等。我们阐明了刚度对超大型浮式结构物行为的影响。我们还开发了时域模拟器，估计由于海震的行为。

The objectives of this research is as follows ; It develops high precision time domain simulator for the behavior of a very large floating structure under the natural environmental conditions, and it establishes the evaluation systems for lifecycle safety and operability under construction of a very large floating structure.The natural environmental conditions consist of multi-directional irregular waves, fluctuating wind, fluctuating current and sea shock. The behaviors include elastic deformation, pressure distribution, internal loads, and mooring line load, besides wave field around a floating body, drifting force on a floating body, and low frequency oscillation.We developed the high precision time domain simulator which predicts elastic behavior of a very large floating structure under the natural environmental conditions including multi-directional waves. We clarified the effect of the rigidity on the behavior of a very large floating structure. We also developed the time domain simulator which estimates the behavior due to the sea shock.