基于粘滞阻尼器的单桩式海上风力机结构振动控制

Vibration Control of Monopile Offshore Wind Turbine Structure based on Viscous Damper

为探究湍流风与地震联合作用下单桩式海上风力机的结构动力学响应与振动控制,以单桩式NREL 5 MW海上风力机为研究对象,采用有限元法建立三维壳模型并基于二次开发将体等效线性模型集成于ABAQUS中,通过附加粘滞阻尼器对地震诱导风力机振动进行控制。结果表明:粘滞阻尼器能够大幅降低地震导致的风力机塔顶振动,但对湍流风引起的塔顶振动控制效果并不明显;粘滞阻尼器也能缓解因地震造成的支撑结构上Von-Mises应力集中现象且在粘滞阻尼器安装位置效果最好;粘滞阻尼器能够显著降低风力机桩基部分所受剪力最大值,而对弯矩的控制效果则在风力机支撑结构部分效果最明显。

In order to study the structural dynamic response and vibration control of monopile offshore wind turbine under the combined action of turbulent wind and earthquake, the monopile NREL 5 MW offshore wind turbine was used as the research object.The three-dimensional shell model was established by the finite element method and the soil equivalent linear model was integrated into ABAQUS based on the secondary development.The vibration of the earthquake-induced wind turbine was controlled by adding viscous dampers to the tower.The results show that the viscous damper can greatly reduce the vibration of the tower top caused by the earthquake, but it has no evident effect on the vibration control of the tower top caused by the turbulent wind.At the same time, the viscous damper can also alleviate the local Von-Mises stress concentration on the supporting structure caused by the earthquake and has the best effect at the location where the viscous damper is installed.The viscous damper can significantly reduce the maximum shear force in the pile foundation of wind turbine, while the bending moment control effect is most clear in the supporting structure of wind turbine.