摩擦热弯曲对转子稳定性的影响

Influence of Thermal Bow on the Stability of Rubbing Bearing-Rotor System

动静摩擦产生热弯曲易导致转子失稳。本文利用简单摩擦热弯曲模型建立了发生摩擦热弯曲的转子 -轴承系统的传递矩阵 ,分析了摩擦热弯曲对转子稳定性的影响 ,同时利用传递矩阵方法计算了特征值对参数的灵敏度。针对一压缩机转子模型进行稳定性分析计算 ,表明转子的稳定状态随转速及参数的变化出现差异 。

The stability of rubbing bearing-rotor system can be easily influenced by the thermal bow. Applying a simple model for the thermal bow induced friction, the transfer matrix of rubbing rotor is introduced to analyze the stability and eigenvalue sensitivity of rotor. In stability computation of a realistic compressor rotor under condition of thermal bow, it is noticed that the characteristic of stability is influenced by rotor speed and other parameters. An explanation for this behavior is given.