基于VMD方法的海上风力机结构TMD抗震

ANTI-seismic of Offshore Wind Turbine with TMD Based on VMD Method

为研究大型单桩式海上风力机结构的TMD振动控制效果,采用实测地震发生时土壤位移时域响应作为地震激励,通过文克尔模型及p-y曲线法构筑的非线性土-构耦合模型模拟土壤中地震释放的能量传递给风力机的过程,以NREL 5 MW大型单桩式海上风力机为研究对象,建立有限元模型,研究TMD对支撑结构在突发地震时的作用及瞬态动力学响应,并采用VMD方法对时域结果进行分析,从不同频带分析TMD对海上风力机的控制效果。结果表明,突发性地震导致塔顶发生大幅剧烈震颤,机舱加速度激增。地震发生时,TMD与风力机塔顶的位移响应形成明显相位差是其实现对风力机在地震发生时被动控制的主要机理,TMD对塔顶位移及机舱加速度响应的高频带分量控制效果更好,保证塔顶诸多重要部件的稳定运行。

In order to study the TMD vibration control effect of large-scale monopile offshore wind turbine structure, the soil displacement time domain response is used as the seismic excitation when the measured earthquake occurs, and the nonlinear soil-structure coupling model constructed by the Winkler model and the p-y curve method is used to simulate the process of energy transfer from the earthquake to the wind turbine. Taking the NREL 5 MW large single-pile offshore wind turbine as the research object, the finite element model is established to study the effect of TMD on the supporting structure in sudden earthquake and the transient dynamic response, the time domain results are analyzed using the VMD method. The effect of TMD on offshore wind turbine is analyzed from different frequency. The results show that the sudden earthquake caused a sharp and severe tremor at the top of the tower, and the cabin acceleration surged. When the earthquake occurs, the obvious phase difference between the TMD and the displacement response of the wind turbine tower is the main mechanism for the passive control of the wind turbine during the earthquake. The TMD has better control effect on the high-frequency component of the tower top displacement and the cabin acceleration response. It guarantees the stable operation of many important parts at the top of the tower.