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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。
In order to study the influence of blade ply parameters on dynamic characteristics of blades and to prevent the blades from resonating and improve the mechanical properties of the blades, a finite element model of a 1.5MW wind turbine blade is established. By changing the ply angle and the proportion of ply fibers, The lamination of the laminates and the modal analysis of the above laminates were carried out. The first six natural frequencies and mode shapes of the laminates were obtained. The reasons for the influence of the laminates on the dynamic characteristics of the laminae were analyzed. The results show that the composites have significant anisotropy, and the natural frequencies can be influenced by changing the ply angle. The waving and shimmy vibrations dominate the low-order vorticity of the blade. Increasing the ply ratio of 0 ° can improve the natural frequency of the low- State appears to reverse, 45 ° ply can improve the blade torsional resistance, help to increase the high-order natural frequency.