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PDF(1440 KB)
PDF(1440 KB)
刚体有限元方法改进及其在风力机动力学中的应用
Modified rigid finite element method for wind turbine dynamics
在建立风力机结构动力学模型过程中,该文发现刚体有限元方法采用的二次划分方法存在缺陷,会导致系统动能存在损失、精度降低。为了对这些缺陷进行改进,抛弃二次划分方法,根据实际结构灵活布置弹性阻尼节点,并调整了弹性阻尼节点的作用范围。对改进方法的正确性和精度进行对比验证,结果表明: 改进方法具有更高的精度; 在分段数目较少时,其位移和频率结果更接近精确解。改进方法灵活易用,处理边界条件简便,有利于在工程应用中的推广。采用改进方法建立了水平轴风力发电机的整机结构动力学模型,该模型结果精确可靠。
The two-stage-division method used by the rigid finite element method has some defects that restrict analyses for wind turbine dynamics. A modified method is developed which replaces the two-stage-division method by distributing the spring damping elements as in the real structure. The action range of the spring damping element is also adjusted. The displacement and frequency results computed by the modified method are very close to precise results. The modified method is flexible with easily applied boundary conditions, so this method can be widely used. A wind turbine dynamic model developed using the modified method gives accurate results.
wind turbine / dynamic / flexible / rigid finite element / modification
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