中文摘要：

针对兆瓦级风力机叶片二元翼段,基于气动弹性力学理论,分别建立了其准定常气动力结构运动耦合模型及非定常气动力结构运动耦合模型.应用该计算模型,对美国可再生能源实验室5 MW大型风力机叶片某截面段进行了颤振分析.重点研究结构参数对叶片气动弹性稳定性的影响规律,研究发现风力机叶片弹性轴的位置、重心的位置沿弦长的变化对颤振速度的影响很大,并提出了提高颤振速度的措施；对两种耦合模型计算结果进行了对比分析,并分析其差异原因.文中的研究对于兆瓦级复合材料风力机叶片,怎样合理地进行叶片内部结构设计从而提高颤振速度甚至是避免发生颤振等不稳定性现象具有理论指导意义.

英文摘要：

In this paper the models of the structure for a MW- size wind turbine blade section coupled with quasi-steady aerody- namic forces and with unsteady aerodynamic forces are built respec- tively based on aeroelastic theory. By using this model, the flutter speed of a 5 MW wind turbine blade section which is defined by NREL is researched. The influence of elastic axis position and the center of gravity position on the flutter speed and flutter frequency are deeply analyzed, and some methods that how to improve the flutter speed are present; finally the comparison analysis for the two computed model is studied and the reason why they are different. In a word, the research in this paper is very important and significant for MW-size wind turbine blade to how to design the wind turbine blade structure so as to improve flutter speed or even avoid this kind of instability.