转子-定子耦合系统振动特性分析

Vibration characteristics analysis of rotor-stator coupled systems

建立简化的双质点模型,对定子质量、支承刚度以及阻尼对系统振动响应的影响进行研究。分析发现,当定子的固有频率接近转子的固有频率时,导致转子的共振响应加剧;若定子的固有频率小于转子的固有频率,在转子的幅频曲线中定子的固有频率处会出现峰值,但转子的共振峰值会降低;适当地增加定子的支撑阻尼,可以有效抑制由定子共振导致的转子共振峰值增加的现象。对一个实际转子-定子系统采用有限元法对定子壁厚的影响进行了分析,得到了与简化模型相同的结论。

By establishing a simplified model of two mass points,the influence of stator quality,the support stiffness and damping on the vibration response of the system are analyzed in this paper. It has been found that when the natural frequency of the stator is close to the natural frequency of the rotor,the resonance response of the rotor is intensified. If the natural frequency of the stator is less than the natural frequency of the rotor,the peak value appears at the natural frequency of the stator,but the resonance peak of the rotor is reduced. Under the circumstance,the appropriate increase of the stator support damping effectively restrains the rise in the rotor resonance peak to the stator resonance. The influence of stator wall thickness is analyzed with the finite element method in a real rotor-stator system,and the same conclusion as the simplified model is obtained.