半潜式平台浮式风力机的动态响应

Dynamic Response of Semi-submersible Platform for Floating Wind Turbines

平台的稳定是保障海上漂浮式风力机能够安全运行的基础。为了保障海上平台的稳定及漂浮式风力机的安全运行,基于Semi-submersible平台的NREL(国家可再生能源实验室)5 MW漂浮式风力机模型,采用辐射/衍射理论并结合有限元方法,调用水动力学软件AQWA(水动力学分析软件),考虑风、浪、流载荷的联合作用,对平台的动态响应进行数值模拟分析,得到了F-K力(波浪力)和绕射力对平台6个自由度运动的影响以及各波浪力随波浪频率的变化趋势。结果表明:平台在低频波浪时容易出现较大响应;随着海洋环境恶劣程度的增加,平台的动态响应增大;垂荡方向的时域和频域响应程度均小于纵荡方向。

The platform stability is the basic requirement for the safe operation of the floating wind turbine. In this paper,NREL floating type 5 MW wind turbine model is built based on Semi-submersible platform. Finite element method along with the radiation and diffraction theory is used. The water dynamics software AQWA is employed to account for the joint action of wind,wave and flow. Then the dynamic response of the platform is investigated and analyzed by numerical simulation. Finally,the wave force( i. e. F-K force and diffraction force) influence on the six degrees of freedom movement platform and its trend with wave frequency are obtained. The results show that the platform is easy to appear larger response for low frequency waves. As marine environment becomes worse,the dynamic response of the platform increases. The time domain and frequency domain responses in heaving direction are less thansurge direction