波群作用下系泊浮体水动力特性研究

海洋随机波列中一群连续的高波叫波群是海洋波浪场中重要特性。它与许多海洋工程问题有密切关系，依据已有的实验数据表明其对浮体的作用力及运动响应，特别是船舶的倾覆、海洋结构物的设计都有明显的影响。申请人拟对波群模拟中关键要素之一的风浪波包谱公式开展研究工作，分析波浪类型对波包谱公式的影响；揭示群性特征值在波列传播中的变化规律；开展群性波浪与系泊浮体相互耦合作用的物理模型试验研究。构建非线性时域数学模型，分析群性参数对系泊浮体运动响应的影响；研究多角度群性波浪作用于系泊浮体的运动响应，探寻群性波列引发系泊系统共振的条件。本项目的研究将进一步的完善目前的经验性波包谱公式，加深对波浪群性这一波浪特性的本质认识。

Groupiness is an important feature of ocean waves, and waves in quick succession are regarded as wave groups, which directly affects the behavior of a moored ship system, ocean engineering structures and ship capsize. Damage that wave groups would cause on breakwaters was studied. The project will investigate the empirical envelope wave spectrum formula, trying to improve its applicable scope. Using the wavelet frequency analysis method, the features of wave groups parameters such as GFH and GLF will be analyzed. Basing on the first part of the works, the project will investigate the effects of groupiness parameters of motion responses of moored ship by numerical simulation and physical experiment. The physical experiment will be further conducted to verify the results of numerical simulation. The numerical simulation model will carry out in order to discuss the generation mechanism of mooring system resonance under the wave groups action. The aim of the study will further improve the empirical wave envelope spectrum formula, to deepen the unique nature of the wave group characteristics, in order to effectively reduce and avoid the wave groups on the damage of mooring floating body.