Aero-Hydrodynamic Coupled Dynamic Characteristics of Semi-Submersible Floating Offshore Wind Turbines Under Inflow Turbulence

In this study,the frequency characteristics of the turbulent wind and the effects of wind-wave coupling on the low-and high-frequency responses of semi-submersible floating offshore wind turbines(FOWT)are investigated.Various wave load components,such as first-order wave loads,combined first-and second-order difference-frequency wave loads,combined first-and second-order sum-frequency wave loads,and first-and complete second-order wave loads are taken into consideration,while different turbulent environments are considered in aerodynamic loads.The com-parison is based on time histories and frequency spectra of platform motions and structural load responses and statistical values.The findings indicate that the second-order difference-frequency wave loads will significantly increase the natural frequency of low-frequency motion in the responses of the platform motion and structure load of the semi-submersible platform,which will cause structural fatigue damage.Under the action of turbulent wind,the influences of second-order wave loads on the platform motion and structural load response cannot be ignored,especially under extreme sea conditions.Therefore,in order to evaluate the dynamic responses of semi-submersible FOWT more accurately,the actual environment should be simulated more realistically.

基于管土相互作用生产立管动态试验研究（英文）

基于一套用来模拟自由悬挂的悬链式立管整体动态分析试验装置,对钢悬链式立管在不同海床模型、不同激励运动和不同环境中的动态响应进行对比分析。动态试验分别在干、湿两种环境下开展,目的是为了得到悬链式立管与不同刚度的土模型相互作用、不同激励运动作用下触地点的运动响应与顶端的张力响应曲线。为了在位型上实现悬链式,选择柔软的硅胶管作为立管模型。整个试验装置系统包括高清位移拍摄系统、运动振荡器、3.60 m×2.05 m×0.60 m的水槽和两千克量程的力传感器。摄像机位置与数据采集点相配合,每隔25 s记录一次位移,通过视频编辑器给出数据,通过模拟三种不同的海床模型在干、湿水槽开展试验。不同刚度的海床模型分别为干、湿塑料泡沫和玻璃,其中干、湿塑料泡沫表示不同刚度的线弹性海床,玻璃则表示刚性海床。运动加载装置轨道包括水平、竖直和圆周运动方向。立管模型在不同海床模型、不同运动激励作用下,分别在干、湿水槽中开展试验,并将得到的动态行为进行对比分析。研究结果对开发中的数值模拟程序进行了重要的改进和参考,是SCR—浮体—海床整体分析试验的重要内容。