中文摘要：

基于离散（矩阵法）和连续（平衡方程）两种方法分别计算桨叶的弯曲和扭转频率，比较了这两种方法对于分析恒频变速风力发电机组桨叶动态特性的优缺点；利用ANSYS大型有限元软件模拟了兆瓦级风力发电机组桨叶的模型，讨论了影响桨叶建模和动特性的主要因素，如单元类型、载荷、约束等，比较了计算值和测量值的误差，分析了桨叶的振型，从而为旋转桨叶的疲劳预测、消除共振和稳定性分析提供诊断的理论依据。

英文摘要：

Bending and torsion frequencies of blades of wind turbines were calculated based on the discrete（matrix） method and consecutive （equilibrium equation） method respectively, and the advantages and disadvantages of the two methods were compared for the analysis of the dynamic properties of blades of constant-frequency and varied-speed wind turbines. The model of blades of a megawatt wind turbine was simulated by using the large finite element software of ANSYS, and the main factors that influence the modeling of blades and their dynamic properties such as elemental type, load restriction and so on were discussed. The errors between calculation value and measurement value were compared, and the vibration shapes of blades were analyzed, which provides a diagnostic basis for fatigue prediction, resonance removal and stability analysis of rotational blades.