地震及多风况下风力机塔架动力响应

为分析不同风速的湍流风与地震联合作用下大型风力机塔架动力学响应，以美国可再生能源实验室(NREL) 5 MW风力机为研究对象，基于考虑土-构耦合效应的Wolf理论，利用动态入流理论及Prandtl理论修正的叶素动量理论计算气动力，基于FAST软件预留数据接口开发了地震载荷计算模块，建立了湍流风与地震联合作用下的风力机仿真模型；计算了5组风速与30种强度地震耦合共150种工况下的风力机塔架动力学响应。结果显示：额定风速下，塔顶位移响应受地震激励影响明显；低风速下地震作用对塔架加速度响应影响较大，高风速的湍流风会加剧塔架剪切力和弯矩响应；湍流风与地震联合作用时，塔顶位移及剪切力和塔基剪切力及弯矩的临界地面加速度峰值随风速的增大先增大再减小，塔顶加速度的临界地面加速度峰值在高风速下随风速增大而增大。

Dynamics Response of Wind Turbine Towers under Seismic and Multi Wind Conditions

In order to estimate the dynamics responses of large-scale wind turbines under the conditions of unsteady turbulent winds coupled with different degree of,NREL 5 MW prototype wind turbine was selected as the research object. Soil-structure interaction was taken in account based on Wolf theory, while aerodynamic forces were calculated via generalized dynamic wake and blade element momentum corrected by Prandtl theory. Based on the data interface of FAST, the seismic load computation module was compiled, while the coupling simulation model for turbulent winds and earthquakes was established. The wind turbine tower dynamics response under 150 working conditions including 5 wind speeds and 30 seismic accelerations was calculated. The results show that the tower top displacement is affected significantly by earthquakes under rated wind speeds. Under low wind speeds, tower acceleration is affected greatly by the earthquake conditions. High speed turbulent winds will exacerbate tower shear forces and bending moment responses. With the combinations of turbulent winds and earthquakes, the critical peak ground acceleration(PGA) of tower top displacement, tower top shear forces, tower base shear forces and tower base bending moments increase first and then decrease with the increasing of wind speeds. When wind speeds are high, the critical PGA of tower top acceleration increases with the increasing of wind speeds.