带有星型齿轮传动结构的转子系统不平衡耦合振动分析

齿轮传动风扇发动机(GTF)的低压转子系统由于带有星型齿轮传动结构,使得其具有有别于传统发动机的动力学特性,因此由于这种齿轮柔性转子耦合系统而产生的振动问题更为复杂.本文基于该低压转子的结构特点,建立了具有星型齿轮传动结构的三支点转子系统有限元模型,通过对高速转子轮盘施加偏心质量,研究不平衡矢量激励下转子系统的耦合振动特性,并进行了相关试验分析.结果表明：在双盘不平衡激励下,由于不平衡之间耦合效应,转子系统各轴段均存在振动减弱的情况.并且与中心齿轮相比,环形齿圈与游星齿轮之间的啮合力更大,且受不平衡初始相位的影响更显著.此外,当相位差为180°时,不平衡对转子系统的危害较大.

Unbalanced coupled vibration analysis of a rotor system with star gear transmission structures

The low-pressure rotor system of Geared Turbofan (GTF) is more complicated due to the star-gear transmission structure, which makes it possess different dynamic characteristics with the traditional engine. Therefore, the vibration problem caused by the gear flexible rotor coupling system is more complicated. Based on the structural characteristics of the low-pressure rotor, the finite element model of the three point rotor system with star-gear transmission structure is established. By applying the eccentric mass to the high speed rotor disk, the coupled vibration characteristics of the rotor system under unbalanced vector excitation are studied. Conducted relevant test analysis. The results show that under the double-plate unbalanced excitation, due to the coupling effect between the imbalances, the vibration of each part of the rotor system is weakened. And compared with the center gear, the meshing force between the ring gear and the star gear is larger, and the influence of the unbalanced initial phase is more significant. In addition, when the phase difference is 180°, the imbalance is more harmful to the rotor system.