考虑流固耦合效应的海上单桩式风电塔动力响应研究

Dynamic response analysis of offshore wind tower founded on monopile considering FSI

风荷载与波浪荷载是海上风电塔承受的主要荷载,对风电塔结构设计起着决定性作用,其动力响应极为复杂。以南通沿海3.0 MW风电机为研究对象,利用数值模拟和现场实测手段,考虑流固耦合效应,建立"基础-塔筒-机舱-风轮"整机模型、风荷载模型、波浪荷载模型,研究海上风电塔在风-波浪联合作用下的结构动力响应以及不同水深对风电机系统振动频率的影响。计算结果表明:采用考虑流固耦合效应与风电塔整机模型分析得到的计算结果与实测结果较一致,可为海上风电塔结构在风-波浪联合作用下的振动分析和结构设计等提供分析方法;波浪荷载对海上风电塔的动力响应存在一定的影响,以风荷载作为主要荷载计算的结果不甚合理;水深对结构低阶振动频率影响不大,但水深对风电塔系统高阶振动频率影响较大,水深越大,高阶振动频率降幅越大。

The dynamic responses of offshore wind turbine towers under combined action of the storm and wave is a complex nonlinear problems. Based on the 3.0 MW wind turbine around Nantong for the study, using numerical simulation and field measurement instruments and considering fluid-structure interaction effect to establish a ＇foundation-tower-cabin-wind wheel＇ tower model, wind load model, wave loading model to study the dynamic characteristics of offshore wind turbines in the combined effects of storm under and different water depths impact on vibration frequency. The results show that considering FSI and the wind turbine overall model the predicted results agree well with field measured results and can provide a reference for the dynamic analysis and structural design of offshore wind turbine under the combined action of wind and wave; wave load has certain impact on the dynamic responses of the turbine; Depth of the water has minor influence on vibration frequency of the structure, but has a significant impact on high-order vibration frequency of the wind turbine systems, and the greater the depth is , the greater the impact is.