A magnetic damper for first-mode vibration reduction in multimass flexible rotors

Many rotating machines such as compressors, turbines, and pumps have long thin shafts with resulting vibration problems. This paper describes an experimental test rig that was set up with a long thin shaft and several masses to represent a flexible shaft machine. An active magnetic damper was placed in three locations: near the midspan, near one end disk, and close to the bearing