筒型基础风机结构振动特性及减振研究北大核心CSCD

筒型基础在我国海上风电工程中已推广应用,探究其在实际工程中的表现,是保证风机安全的关键。本文针对筒型基础风机结构的振动位移进行原型监测,并以单桩基础风机作为对照。首先基于风机实测自振频率,采用遗传算法拟合基础刚度,然后统计并对比两种基础风机的振动水平。结果表明:两种基础的水平刚度相差7%,筒型基础的旋转刚度是单桩的10倍;风速小于6 m/s时,筒型基础风机位移大,大于6 m/s时,单桩基础位移大;3P共振导致小风速下筒型基础位移较大,通过优化运行策略,减小振动位移最大达54.4%。筒型基础在抗倾稳定性和振动响应控制方面具有优势。

Structural vibration behavior and vibration reduction of bucket foundation wind turbines

With the wide application of bucket foundation in China, its performance monitoring in engineering practice has been the key to the operation safety of offshore wind turbines (OWTs). In this study, the vibration displacement of a prototype OWT with a bucket foundation is observed and compared with a monopile foundation OWT. First, based on the measured natural frequencies, foundation stiffness is calculated using the genetic algorithm. Then, the vibration level of the two OWTs are calculated and compared. Results show that of the two foundations, the difference in horizontal stiffness is 7%, while the bucket foundation has a rotational stiffness ten times greater than the monopile. And the bucket foundation OWT features a displacement larger than the monopile type at a wind speed lower than 6 m/s, but above this threshold the trend reverses. At a low wind speed, the occurrence of 3P resonance leads to a larger displacement of the bucket foundation, which, nevertheless, can be reduced by 54.4% through applying an optimized operation strategy. This study shows bucket foundation has superiority in both anti-overturn stability and vibration control.