齿轮轴系弯扭耦合振动特性

以某大型压缩机转子系统为研究对象,计及机组和支承的弹性变形和齿轮的时变啮合刚度,结合转子动力学,建立了齿轮转子系统的有限元模型,综合分析了齿轮转子系统的弯扭耦合振动特性.探讨了膜片联轴器、啮合刚度以及支承刚度、支承阻尼对齿轮转子系统固有频率和稳定性的影响.结果表明,啮合刚度对系统临界转速的影响不大,而对系统处于高阶模态时的稳定性影响较显著;膜片联轴器的中间轴段质量、膜片数目、膜片厚度等以及支撑的刚度、阻尼对系统的临界转速和稳定性都有一定的影响.

Characteristics of Bending-Torsional Coupled Vibrations of Gear Shafting

Combining with rotor dynamics,a finite element model is developed for the gear-rotor system of a heavy-duty air compressor set with the elastic deformation of shaft,bearing and time-varying meshing stiffness taken into account.The characteristics of the bending-torsional coupled vibrations are therefore analyzed comprehensively for the gear-rotor system.Because the influencing factors on the system are too much,only such factors as the flexible diaphragm coupling, meshing stiffness,bearing stiffness and bearing damping whether affects the natural frequency and stability of the gear-rotor system are discussed.The results showed that the meshing stiffness affects slightly the critical speed of the system but affects obviously the stability if the system is in a higher order mode.The mass of the shafts within the diaphragm coupling,number and thickness of diaphragms and the bearing stiffness and the damping all affect the critical speed and stability of the system to a certain extent.