基于气动弹性剪裁的风力机叶片模态分析

Analysis of the Modal of a Blade in a Wind Turbine Based on the Aeroelastic Tailoring

本文为研究叶片铺层参数对叶片动态特性的影响,防止叶片产生共振,改善叶片力学特性,建立了1.5 MW风力机叶片的有限元模型,通过改变铺层角度和铺层纤维比例实现多种不同层合板结构的叶片铺层,并对上述各种铺层叶片结构进行了模态分析,获得了各模型的前六阶固有频率和振型,分析了铺层参数影响叶片动态特性的原因。结果表明:复合材料具有显著各向异性,通过改变铺层角度能影响固有频率大小;叶片低阶振型以挥舞和摆振为主,增加0°铺层比例能提高低阶固有频率;叶片高阶模态出现扭转,45°铺层能提高叶片抗扭能力,有利于增加高阶固有频率。

To study the influence of the lamination parameters of a blade on its dynamic characteristics,prevent the blade from any resonance and improve the characteristics of the blade in mechanics,established was a finite element model for blades in a 1. 5 MW wind turbine. Through changing the angle and the fiber proportion of the lamination layer,the authors implemented a variety of the lamination layers of the blade in various ply plate structure and conducted an analysis of the modal of various lamination structures of the blade above mentioned,obtained the first six order intrinsic frequencies and vibration patterns of various models and analyzed the cuases of the lamination parameters influencing the dynamic characteristics of the blade. It has been found that the composite materials have their significant anisotropy and to change the angle of the lamination layer can influence the magnitude of the intrinsic frequency. The flapwise and edgewise vibration will dominate the low order vibration patterns of the blade and to increase the proportion of the lamination layers at an angle of 0 degree can enhance the low order intrinsic frequency and the torsional vibration will occur in the high order modal. The lamination layer at an angle of 45 degrees can enhance the torsion-resistant capacity of the blade and contribute to enhancing the high order intrinsic frequency.