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中文摘要：
考虑气动弹性对风力机叶片的影响,采用非定常叶素动量理论计算气动载荷,考虑离心力影响计算挥舞/摆振耦合的旋转叶片动力特性,运用模态叠加法,建立了叶片动力学方程,采用Runge-Kutta-Nys trom方法对方程进行求解,并引入气动阻尼效应,实现了气动与结构的耦合。进行了叶片动力特性及稳定偏航下叶片载荷与气弹响应的计算,并与商用软件计算结果进行了分析比较。结果表明,离心力对叶片动力特性存在明显影响,考虑气动弹性影响十分必要,对准确预测叶片振动水平和疲劳寿命具有重要意义。与商用软件相比,本文方法有一定的改进。
英文摘要：
The aeroelastic effect on wind turbine blade is investigated.The unsteady blade element momentum method is used to calculate the aerodynamic loads and the effect of centrifugal force is considered to obtain the dynamic characteristics of rotating flap/edgewise coupled blade.The mode superposition method is used to build the dynamics equations of blade,which is solved by the Runge-Kutta-Nystrom methods,and the aerodynamic damping is imported to couple aerodynamics with structures.The dynamic characteristics of the blade and the loads as well as the aeroelastic responses in yaw condition are calculated. The results demonstrate that the centrifugal force has obvious influence on the dynamic characteristics of the blade and it is necessary to consider the aeroelastic effect,which is important for precisely estimating the vibration level and the fatigue life of blade.Compared with the commercial code,the presented methods have certain improvements.
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