半潜型浮式风力机平台的完整稳定性研究

Intact stability analysis of a semi-submersible platform for floating offshore wind turbines

为研究半潜型浮式风力机平台的初稳性高度限值和完整稳定性的影响因素等问题,对半潜型浮式风力机平台的完整稳定性进行了理论分析和数值计算。基于重心移动原理,结合风力机平台的静平衡角和摇摆周期等因素,提出了适用于半潜型浮式风力机平台的初稳性高度限值计算公式。从进水角的角度分析了浮式风力机平台大倾角稳定性中的最不利倾斜轴问题。利用Sesam软件对某半潜型浮式风力机平台进行数值模拟,研究了浮筒间距、浮筒直径和干舷高度三个因素对风力机平台稳定性的影响规律。结果表明:三个因素以不同的方式改变稳定性,同时会对初稳性高度、重心高度和排水体积等产生不同程度的影响。这些结论可为半潜型浮式风力机平台设计提供参考。

In order to investigate the limit of the initial metacentric height （ GM ） and factors influencing the intact stability of a semi-submersible platform for floating wind turbines,research on the stability of the semi-submersible platform is performed by theoretical analysis and numerical simulation. A design formula for setting the limit of GM of a semi-submersible platform for floating wind turbines is proposed according to steady-state heel angles and roll -ing periods based on stability theory in marine engineering. Then,the most critical heeling axle of the floater is analyzed by theory. Finally,a numerical simulation for a 5WM floating wind turbine is performed using Sesam software to investigate how three main factors, including the distance between pontoons, the radius of pontoons and the height of freeboard,influence the stability of platforms. The results indicate that these factors affect stability in different ways, corresponding with various effects on GM , center of gravity and displacement. These results can be used as reference for the design of semi-submersible platforms for floating wind turbines.