中文摘要：

根据多自由度模态分析理论，对水平轴风力发电机塔架的振动模态进行数学建模和仿真．运用次空间迭代法对模型进行数值计算，分析塔架在自由振动时的力学特性，获取塔架的固有频率和振型．结果表明，塔架的一阶固有频率高于叶片通过频率，属于刚性塔，不会囡风轮激励而产生共振；依据振动理论，塔架振动过程的能量主要集中于一、二阶频率处，而一、二阶振型均为摆振，因此摆振是塔架的主要振动方式，是引起塔架疲劳破坏的主要原因．

英文摘要：

According to the theory of multimodal analysis, mathematical modeling and simulation of vibrational mode were conducted for the tower of horizontal-axis wind turbine. Numerical evaluation of the model was performed by using sub space iteration method and the mechanical characteristics of the tower with natural oscillation was analyzed so that its inherent frequency and inherent vibration mode were obtained. It was shown by the analysis that the first-order innate frequency of the tower was higher than blade passing frequency（BPF）, meaning that the tower was a rigid one and its resonance might be caused by the stimulation of wind wheel would not take place. According to vibration theory, the energy of tower vibration was focused at the first-and second-order frequency on its the vibration mode, showing that the shimmy was the main tower vibration mode which was the main reason of tower fatigue.