Amplitude modulation (AM) in planetary gears, arising from rotation of carrier, is a predominant phenomenon that yields unique yet complicated dynamic behavior. However, the effect of gravity of planetary gear components contributes additional frequency components in the modulation sidebands. In this paper, an extensive experimental investigation is performed to obtain the frequency components of the test rig having the configuration of a modern wind turbine gearbox. The experimental results present some new insight into the combined effect of AM and gravity. A dynamic model of a wind turbine gearbox (WTG) having a two-stage planetary gear set is developed to predict the dynamic response as observed in the experiment. The AM effect due to carrier rotation and the effect of gravity is implemented in the dynamic model. Frequency response and order analysis are carried out for the simulated and experimental signals. It is observed from the comparison of simulation and experimental results that the developed model is capable of correctly describing the dynamic characteristics of the WTG. These results help to understand the complex vibration response of multi-stage planetary gears in a WTG.

行星齿轮中的振幅调制 (AM) 由行星架旋转引起，是一种主要现象，可产生独特而复杂的动态行为。然而，行星齿轮部件的重力效应会在调制边带中产生额外的频率分量。在本文中，进行了广泛的实验研究，以获得具有现代风力涡轮机齿轮箱配置的试验台的频率分量。实验结果为 AM 和重力的组合效应提供了一些新的见解。开发了具有两级行星齿轮组的风力涡轮机齿轮箱 (WTG) 的动态模型，以预测实验中观察到的动态响应。由于载体旋转和重力效应导致的 AM 效应在动力学模型中实现。对模拟和实验信号进行频率响应和阶次分析。从仿真和实验结果的对比中可以看出，所建立的模型能够正确描述风力发电机组的动态特性。这些结果有助于了解 WTG 中多级行星齿轮的复杂振动响应。