含增速齿轮的转子系统固有特性研究

在建立齿轮啮合作用的基础上,建立了某型齿轮增速非直联压缩机转子系统有限元模型.为更能体现含齿轮转子系统的特点,首先对单轴进行分析,并在此基础之上对含齿轮啮合的整机进行了动力学特性分析,包括弯曲振动、扭转振动以及弯扭耦合振动.分析结果显示:由于齿轮啮合效应的存在,使得增速箱系统出现了新频率;轴套对耦合系统的扭转影响主要体现在第3,4阶上;而弯扭耦合特性中齿轮的耦合作用较弱.因此认为,在进行该类转子系统的设计时应充分考虑齿轮的啮合作用,以保证系统设计的缺陷达最低.研究结果可以为相关系统的设计工作及其振动控制提供理论参考.

Research on the Inherent Characteristics of Rotor System with Speed Increasing Gear

The finite element model of a non-associated gear compressor rotor system was established with considering the influence of the gears engagement.To study the characteristics of the gear-rotor system,the single axis of the whole system are successively analyzed.Dynamic characteristics of the whole machine with engaging gears are tested through bending,torsional and coupled vibrations.The results show that new system frequency arises due to the existence of the gear meshing effect;the torsional effect of sleeve on the coupled system is mainly reflected in the third and the fourth order;the coupled effect of gears is relatively weak in the coupled characteristics of bend and torsion.To avoid design defects of the system,the gear meshing effect must be fully considered.This work provids a theoretical reference for fault diagnoses,vibration control and stability design of the rotor-bearing system.