考虑时变气动阻尼的风电机组塔筒地震响应分析

为了分析时变气动阻尼对风电机组塔筒地震响应的影响,首先分析了塔筒所承受的地震载荷和气动载荷,然后基于气动载荷和相对风速之间的导数关系推导了塔筒前后和左右方向上的时变气动阻尼计算方法,将地震加速度和时变气动阻尼引入到塔筒动力学运动方程中并进行时域求解,以某2.0MW风电机组塔筒为例进行地震响应计算,分析了影响气动阻尼大小的翼型气动特性,并着重研究了地震作用下时变气动阻尼对塔顶振动位移的影响程度,为风电机组塔筒抗震设计提供一定参考。

Seismic Response Analysis of Wind Turbine Tower Considering Impact of Time-varying Aerodynamic Damping

In order to analyze the impact of time-varying aerodynamic damping on the seismic response of wind turbine tower, the seismic loads and aerodynamic loads on the tower were analyzed. And then the calculation method of time-varying aerodynamic damping of two directions of the tower was derived based on the derivative relationship between the aerodynamic loads and relative wind speed. The seismic acceleration and time-varying aerodynamic damping were brought in the dynamic motion equation of tower, which was analyzed in time-domain. The seismic response of a 2.0 MW wind turbine tower was calculated, and the impact of aerodynamic characteristics of the aerofoil on the aerodynamic damping was analyzed. Finally, the influence of the time-varying aerodynamic damping on the seismic response of the different directions of the tower were studied, which provides a reference for the seismic design of wind turbine tower.