It is well established that the vibration of rotating
machinery can be reduced by introducing passive devices
into the system (Cunningham, 1978; Nikolajsen and
Holmes, 1979). Although an active control system is usually
more complicated than a passive vibration control
scheme, an active vibration control technique has many
advantages over a passive vibration control technique.
First, active vibration control is more effective than passive
vibration control in general (Fuller et al., 1996). Second,
the passive vibration control is of limited use if several
vibration modes are excited. Finally, because the active actuation device can be adjusted according to the vibration
characteristic during the operation, the active vibration
technique is much more flexible than passive vibration
control. The main purpose of this paper is to review and
reevaluate the active vibration control techniques for rotating
machinery and shed some light on future research
directions.