多支撑转子系统轴承对荷载变化的敏感度研究

Research on Bearing Load Sensitivity for Multi-support Rotor System

大型汽轮发电机组转子-轴承系统由多个滑动轴承支撑,属于一个静不定结构,轴承载荷的分配直接影响着机组的安全稳定运行,严重时导致机组失稳。以某汽轮机的轴系为研究对象,基于虚位移原理建立了一个具有多支撑结构的转子动力学模型。利用该模型研究荷载变化对于轴系上各个轴承动力特性的影响,考察轴系上各轴承对荷载的敏感程度,从而为多跨转子轴承系统运行故障诊断提供理论指导。

Rotor-bearing system of large steam turbine generator unit,supported by multiple sliding bearings is a statically indeterminate structure.The operation safety of turbo-generator unit is influenced by bearing load distribution,and sometimes even causes instability.On the basis of the principle of virtual displacement,a rotor dynamics model of multi-support structure is built.The model is used to investigate the impact of load change on dynamic characteristics of bearings to check load sensitivity of the bearings,for the purpose of providing theoretical basis for fault diagnosis of multiple rotor bearing system.