考虑齿轮柔性的风电机组传动系统扭振特性分析

TORSIONAL VIBRATION CHARACTERISTICS OF WIND TURBINE TRANSMISSION SYSTEM CONSIDERING GEAR FLEXIBILITY

风电机组传动系统的柔性对机组的动力特性影响较大。本文利用有限单元法,根据多柔体动力学基本理论,构建考虑风电机组齿轮箱、联轴器、发电机等传动系统柔性的分析模型;根据模态分析理论,提出一种基于矢量位移云图筛选扭振频率的方法,获取风电传动系统低频至高频的扭振模态;利用坎贝尔图以及能量比判别系统共振点。结果表明,建立多柔体动力学模型对准确评估风电机组传动系统的动态特性具有重要作用。风电机组传动系统在1.33、39.16和241.30 Hz等不同激励频率载荷作用下,分别在齿轮主轴、发电机转子和二级太阳轮轴等不同位置存在共振模态。该计算结果与工程实际高度吻合,该分析方法可为风电机组传动系统优化设计提供理论依据。

The dynamic characteristics of wind turbines are greatly influenced by the flexibility of transmission system of wind turbine.In this paper,finite element method(FEM)is used to construct an analysis model considering the flexibility of transmission system of wind turbine gearbox,coupling and generator according to the basic theory of multi-flexible body dynamics.According to modal analysis theory,a method based on vector displacement cloud map is proposed to screen the torsional vibration frequency,and the torsional vibration modes from low frequency to high frequency of wind power transmission system are obtained.Campbell diagram and energy ratio are used to identify the resonance points of the system.The results show that the dynamic model of multi-flexible body plays an important role in accurately evaluating the dynamic characteristics of wind turbine transmission system.Under different excitation frequency loads such as 1.33,39.16 and 241.30 Hz,the transmission system of wind turbine has resonance modes at different positions such as gear spindle,generator rotor and secondary solar wheel shaft.The calculated results are highly consistent with the engineering practice,and the analysis method can provide theoretical basis for optimal design of wind turbine transmission system.