通过附加轴承静载荷在线消除油膜振荡故障

提出了一种在线非接触式施加轴承静载荷的方法，以达到增加系统稳定性、在线消除油膜振荡故障的目的。首先运用达朗伯原理结合里茨法建立了非线性非稳态油膜力作用下的多自由度转子-轴承系统的运动方程，并运用变步长的Newmark数值积分方法对非线性系统的稳定性以及附加静载荷对油膜振荡的影响等问题进行了研究。计算结果表明：增加静载荷可以在线改变系统的涡动中心，增加系统的稳定性，从而在线消除油膜振荡，使原来失稳的转子系统又回到稳定的周期运动状态。然后针对这一结论，在一台较大型的高速转子试验台进行试验，通过设计和安装的一个电磁执行器来施加静载荷，并进行了多次实验研究，实验结果和理论结果基本一致。

Elimination of oil whip online by additional bearing static load

A new method to eliminate the oil whip online is put forward by means of additional static bearing load, which can make the whirling center of the journal lower and enhance the stability of the system. The dynamic equations of rotor-bearing system are built by combing d'Alemdert principle with Rize way, and the nonlinear oil film forces based on steady short bearing theory are coupled to system. Such nonlinear equations are numerically solved by Newmark integration method. The calculated results show that it can make the whirling center of the journal lower and enhance the stability of the system by additional static bearing load. The complex trajectories of the journal motion are disappeared and the rotor-bearing system returns to periodic state. Experiments to demonstrate this phenomenon are carried out in a large multi-disk rotor supported by two plain journal bearings. To produce the static force is experiment online the electromagnetic actuator is designed. The static force produced by the electromagnetic actuator can be regard as an additional bearing load. The experimental results are close to the numerical ones.