This study investigated the dynamic behaviour of a spar-type offshore floating wind turbine (OFWT) analysed under various wave loads by conducting an experiment campaign. Both the characteristic of the spar platform itself and the spar with realistic moorings have been investigated. A particular focus of the study was the motions of the mooring lines, which were measured at a series of discrete points along one line using an underwater motion capture system, in parallel with tension measurement at the anchor points. The main objective of this study is to provide experimental measured data to validate numerical software on the research of mooring line motions.

A free decay test has been carried out to confirm the spar platform motions natural frequencies and damping characteristics. The platform was then subjected to a range of regular and irregular waves to obtain the motion characteristics of the platform and the mooring lines. For the mooring line motions, which has rarely been discussed in published research, a non-linear snatching phenomenon has been observed at the tank for some wave frequencies. This non-linear behaviour shows that snatching leads to the high instantaneous mooring line tensions and platform accelerations could cause the failure of the mooring lines in the real structure.

本研究通过开展实验活动，研究了在各种波浪载荷下分析的翼梁式海上浮动风力涡轮机 (OFWT) 的动态行为。已经研究了梁平台本身的特性和具有真实系泊的梁。该研究的一个特别重点是系泊线的运动，这些运动是使用水下运动捕捉系统在沿着一条线的一系列离散点处测量的，同时在锚点处进行张力测量。本研究的主要目的是提供实验测量数据来验证数值软件对系泊线运动的研究。

进行了自由衰减试验以确认梁平台运动的固有频率和阻尼特性。然后平台受到一系列规则和不规则波浪的影响，以获得平台和系泊绳的运动特性。对于在已发表的研究中很少讨论的系泊绳运动，在某些波浪频率下在水箱中观察到了非线性抢夺现象。这种非线性行为表明，抢夺导致高瞬时系泊索张力和平台加速度可能导致实际结构中的系泊索失效。