风电齿轮传动系统弹流润滑特性研究

为研究风电机组齿轮传动系统的润滑特性和动力学特性,以SQI风电机组传动系统实验平台中两级定轴齿轮箱为研究对象,综合考虑齿轮油膜刚度、齿轮啮合刚度以及轴承时变刚度等,计入轴的柔性并采用有限元法建立多自由度渐开线直齿轮动力学模型,利用Newmark 积分方法求解多源时变激励下两级齿轮传动系统的动力学特性。讨论不同工况条件对油膜刚度的影响,并研究系统润滑特性、固有频率和振型的变化规律。研究结果表明,在考虑齿轮润滑效应后,齿轮啮合刚度降低,系统动态特性变化趋于敏感,系统固有特性均有所变化,其中对第11阶影响最为突出,然而在系统共振转速附近,固有特性变化趋势有所减弱。

RESEARCH ON ELASTOHYDRODYNAMIC LUBRICATION CHARACTERISTICS OF GEAR TRANSMISSION SYSTEM IN WIND TURBINE

In order to study the lubrication characteristics and dynamics characteristics of the gear transmission system of wind turbines, the two-stage fixed-axis gearbox in the SQI wind turbine transmission system experimental platform is taken as the research object, and the gear oil film stiffness, gear mesh stiffness and bearing time-varying stiffness are comprehensively considered. Taking into account the flexibility of the shaft and using the finite element method to establish a multi-degree-of-freedom involute spur gear dynamic model, the Newmark integration method is used to solve the dynamic characteristics of the two-stage gear transmission system under multi-source time-varying excitation. The effects of different working conditions on the stiffness of the oil film are discussed, and the system’s lubrication characteristics, natural frequencies and vibration modes are studied. Studies have shown that the gear meshing rigidity is reduced after considering the gear lubrication effect, the system dynamic characteristics tend to be sensitive, and the inherent characteristics of the system have changed. Among them, the influence on the 11th order is the most prominent. However, the tendency of inherent characteristic changes is weakened near the resonance speed of the system.