屋顶安装型风力机塔架风振反应分析

为了研究屋顶安装型风力机塔架在风荷载作用下的动力性能,对该塔架进行风振时程反应分析.建立考虑叶片传至塔架作用力的塔架振动方程,采用引入快速傅里叶变换(FFT)技术的谐波叠加法分别模拟得到叶片和塔架的风速时程,利用叶素理论计算叶片传至塔架作用力.研究屋顶集风效应和叶片旋转对此类风力机塔架风振反应的影响.结果表明考虑屋顶集风效应后塔架的风振反应有一定增强；叶片旋转情况下塔架位移和弯矩显著增加.

Wind-induced response analysis of wind turbine tower installed on building roof

To investigate the dynamic behavior of wind turbine tower installed on building roof, wind-induced response of tower was analyzed. The vibration equation of tower was first established with force transferred from blades considered. The wind velocity time history of blade and tower were then simulated by the harmonic wave superimpose method combined with Fast Fourier Transform (FFT) technology. The blade element theory was adopted in calculating the aerodynamic load subjected on blade. Followed that, the influence of the roof enhancing effect and the blade rotation on wind-induced response of the tower was studied respectively. Numerical results show that the wind-induced response of tower enlarges when the roof enhancing effect is taken into account, and the displacement and moment of tower increases significantly when the rotation of blades is considered.