2018 年 84 巻 6 号 p. 584-588
Oil film bearings have higher load capacity and larger damping than ball bearings. Therefore, the rotors of large turbomachines are usually supported by oil film bearings. However, at high rotational speeds, the swirling flow of the lubricant destabilizes the rotor system and induces self-excited vibrations such as oil whip and oil whirl. Since these vibrations limit the operational speed and reliability, a method for eliminating them and increasing the operational range is necessary. We propose a method for stabilizing these self-excited vibrations by using an electro-magnetic actuator to cancel the force due to the cross-coupled stiffness. This study demonstrated the experimental evaluation of the effectiveness in suppressing the self-excited vibration using the electro-magnetic actuator.