半潜式浮式风机耦合动力响应特性试验研究

Experimental Research on Coupling Dynamic Response of Semi-submersible Floating Offshore Wind Turbine

漂浮式风机顶部叶片水平平均气动载荷和叶片旋转运动诱发的高频载荷与塔筒结构和锚泊系统相互耦合,构成复杂的非线性系统。系统的耦合动力特性分析是方案总体设计的关键。在水池中开展不同浪向和海况条件下的试验。试验结果表明,在该系统模型的纵摇和横摇间存在显著的低频耦合;1倍和3倍叶片旋转频率分别与波浪频率和塔筒一阶频率接近,极易引起大幅谐振,而2倍频的影响较小。

For a floating offshore wind turbine,the horizontal aerodynamic load of the top blade and the high-frequency load of the rotating blade are interacted with the tower structure and mooring system.Coupling dynamic characteristics of the system are the key to the overall design of the scheme.In this paper,a full-system physical model is established to carry out the test in a towing tank under different sea conditions.Coupling response characteristics of the system are analyzed.It is shown that there is a significant low-frequency response of the system.Besides,the one time and three times of the blade rotation frequency are close to the wave frequency and the first order frequency of the tower respectively,which is easy to induce large resonance,but the two times of the blade rotation frequency only has little effect.