漂浮式风力机平台动态响应的优化方法探讨

Optimization method for dynamic responses of floating offshore wind turbines

为研究漂浮式风力机平台动态响应的优化措施,分别提出平台附加螺旋侧板和平板的方式。建立基于Spar平台的5MW风力机整机模型,利用有限元软件进行水动力计算,得到了结构运动和波浪力的幅频特性。并通过与附加螺旋侧板和平板情况下的频域和时域动态特性参数对比,探讨两种措施是否对结构的运动性能起到提升作用。结果表明:附加螺旋侧板后,结构在垂荡和纵摇上的运动幅值均得到了明显抑制;附加平板可以有效降低结构的垂荡频域响应峰值,但对纵荡和纵摇影响很小;在考虑实际风、浪、流载荷作用时,两种措施都能起到对结构运动性能的优化作用,附加螺旋侧板的优化作用更为优越。

For improving the dynamic responses of floating offshore wind turbine （FOWT） , a whole machine model for Spar platform supported FOWT was built to study the influences of the attachment of helical strake and circular plate on dynamic responses. In order to understand whether the two attached devices can improve the performance of FOWT, time-domain and frequency-domain performances of the two new structures were analysed and compard with those of the normal structure. The results show that the heave and pitch motion amplitudes of FOWT attached with helical strake are effectively suppressed. The attachment of circular plate can decrease the peak amplitude of heave frequency responses but shows no improvement in surge and pitch motion. In addition, both the two attached devices succeed to improve the kinematic performance when considering the combination load of wind, wave and current. Helical strake has better result than circular plate.