大型风力机叶片阻尼层厚度分析与抑颤研究

为增强大型风力机叶片抑颤效果,从增加叶片的结构阻尼角度出发,以8 MW风力机叶片为研究对象,通过铺层设计和阻尼层位置设计为建立阻尼叶片有限元模型提供基础.分别以SHELL181单元和SOLID185单元模拟叶片上下蒙皮和阻尼层,对无阻尼叶片和阻尼叶片两种模型进行模态分析,探究阻尼层厚度变化对原叶片整体质量、固有频率及结构损耗因子的影响.确定8 MW风力机阻尼叶片阻尼层最佳敷设厚度,最后在最佳阻尼层厚度基础上对比分析两种叶片抑颤效果.结合结构损耗因子发现阻尼层厚度并非越大越好,经敷设最佳阻尼层厚度,原叶片可在质量增加极少的情况下提高抑颤能力.

Analysis of thickness of damping layer of large wind turbine blades and study on flutter suppression

In order to enhance the vibration suppression effect of large wind turbine blades, from the perspective of increasing the structural damping of the blades, the 8 MW wind turbine blades are taken as the object of study, and the design of the damping layer and the position of the damping layer are used to provide the basis for establishing the finite element model of the damping blade. SHELL181 and SOLID185 elements are used to simulate the upper and lower skins and damping layers of the blades, modal analysis are performed on the two models of undamped blades and damped blades, and the effect of the thickness change of the damping layer on the overall quality, natural frequency and structural loss factor of the original blades are discussed. The optimal laying thickness of the damping layer of the damping blade of the 8MW wind turbine is determined. Finally, based on the optimal damping layer thickness, the two types of blade vibration suppression effects are compared and analyzed. Combined with the structural loss factor, it is found that the thickness of the damping layer is not as large as possible. The optimum thickness of damping layer on the original blade can improve the ability of vibration suppression with little mass increase.