用电磁激振器进行转子-轴承系统振动控制的研究

Vibration fault-free of rotor-bearing system, as the heart of turbomachinery, is ideal for all of process industries. Due to various excitations, however, no turbomachinery is vibration-free. In this paper, for minimizing the vibration level as the machine working and realizing vibration fault-free, the Fault Self-recovery(FSR) mechanism is introduced and investigated in detail. The strategy of vibration control is investigated theoretically using numerical method firstly. In this phase, take one of centrifugal compressors with headache instability fault causing more than forties Emergency Shun-Down(ESD) in last year as example, the feasibility of FSR in real industry machine is investigated. Result of it indicates that only a small control force can improve stability margins of the compressor and prevent subsynchronous vibration fault efficiently. AME can provide suitable force by varying the control current in the exciters depending upon a proportional and derivative control law and so are selected as the actuator of FSR. The technique provides control force over an air gap and hence is free from the difficulties of maintenance, wear, tear and power loss. About synchronous vibration force, AME also has the ability to eliminate it as the machine working. Three control strategies are investigated to realize the fault self-recovery as far as possible. Experimental study was conducted on a test rig at various rotating speed. Result of it indicates that the non-mistake control strategy can minimize synchronous vibration no more than three second.