风力机叶片与整机的预应力振动模态分析

为了研究10 kW水平轴风力机叶片及整机的振动情况,通过建立其模态分析计算模型和预应力模态分析计算模型的方法,对旋转叶片施加风载荷和旋转离心力,在完成网格划分、载荷与约束条件的添加后,进行了预应力下的振动模态分析,并将几种工况下的固有频率进行了对比并得出结论.结果表明：仅有风载荷工况时,叶片和整机的固有频率基本没有变化;当同时有风载荷和旋转离心力时,随着风速的增加,固有频率有比较明显的增加,但当风速达到一定程度时,不再发生变化.

The Prestressed Modal Analysis on Blade of Wind Turbine And Entire Machine

The models are established for calculating the modal analysis and the prestressed modal analysis about lOkW horizontal axis wind turbine blades and machine. Applied the wind load and rotating centrifu- gal force, the vibration modal analysis under prestress is conducted after completing meshing and adding loads and constraints. A comparison about natural frequency under different working conditions is made. The results show that when there is wind load case, the natural frequency of the blade and the whole ma- chine does not change, when there are both wind load and rotating centrifugal force, the natural frequency obviously increases as the wind speed increases; but when the wind speed reaches a certain degree, it no longer changes.