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针对大型风力机叶片的颤振问题,将共固化粘弹复合材料层合结构应用于风力机叶片。首先,建立了共固化阻尼叶片三维有限元模型,通过计算某型1.5 MW风力机叶片关键模态的应变能分布情况,确定了阻尼层的铺敷位置。然后,基于模态应变能法参数化分析了阻尼层厚度与复合材料偏轴纤维角对结构固有频率及模态损耗因子的影响。最后,通过Newmark直接积分法对原叶片及阻尼叶片在额定风速下的动态响应进行了仿真对比,验证了共固化层合阻尼叶片的抑颤效果。
Aiming at the flutter of large wind turbine blades, the co-curing viscoelastic composite laminated structure is applied to wind turbine blades. First, a three-dimensional finite element model of the co-cured damper was established. The distribution of the strain energy of the key modal of a certain type of 1.5 MW wind turbine blades was determined, and the position of the damping layer was determined. Then, based on the modal strain energy method, the influence of the thickness of the damping layer and the eccentric angle of the composite fiber on the natural frequency and mode loss factor of the structure was analyzed. Finally, Newmark direct integration method was used to simulate the dynamic response of the original blade and the damping blade at the rated wind speed, which verified the anti-jamming effect of the laminated solidified damping blade.