考虑密封的悬臂转子系统的裂纹故障分析

Fault Analysis to Cracked Over-Hung Rotor-Bearing System with Seal

以双盘悬臂立式转子-轴承系统为研究对象,建立了系统运动微分方程,并用数值方法分析了在非线性密封力和非线性油膜力作用下的裂纹转子的动力学特性。分析表明,在一定深度裂纹下,转子系统响应随不同角频率比表现出复杂的非线性现象,出现了周期k运动、拟周期运动和混沌运动等多种运动形式。在一定角速度时,工作在远离临界角速度区的转子系统对裂纹非常敏感,而工作在近临界角速度区的转子系统对裂纹不是特别敏感,但是裂纹对它的运动状态影响较大。该研究结果为该类转子-轴承系统的安全运行与故障诊断提供了一定的理论参考。

The differential equations of motion are established aimed at dual-disk vertical over-hung rotor-bearing system,and the dynamic characteristics of cracked rotor are analyzed numerically under nonlinear seal fluid dynamic force and oil-firm force.It indicates that complicated nonlinear phenomena at different angular frequencies appear as the shaft crack gets a certain depth,such as period-k motion,quasi-periodic motion and chaos motion. The rotor system operating away from the critical angular velocity is very sensitive to crack fault,and the rotor system operating near critical angular velocity is unsensible,but the crack affects the motion state severely,which provides theoretical references for safe operation and fault diagnosis of the rotor-bearing systems.