Experiments in the control of unbalance response using magnetic bearings

The Foundation of Electromagnets Based Active Vibration Control

“…AMB can be used to apply a synchronous force to the shaft to control the imbalance response, either to cancel the force transmitted to the base or to compensate for the vibration displacement of the shaft. In (Knospe et al, 1996;Knospe et al, 1995;Knospe, Tamer, & Fittro, 1997;Knospe, Tamer, & Fedigan, 1997) presented an adaptive open-loop control method for the imbalance displacement vibration control using AMBs. A synchronous force that consists of sinusoids that are tied to the shaft angular position via a key phasor signal was generated and applied to the rotor through the magnetic supporting bearings.…”

Estimation and Active Damping of Unbalance Forces in Jeffcott-Like Rotor-Bearing Systems

“…The absence of contact between an AMB and rotor avoids wearing and the need of lubrication, in addition, AMB dynamics is relatively easy to control [21]. For this, many researchers have reported results about showing the viability for AMB application in vibration control of rotating machinery since the 1990's [16,26] until recent days [1,13,20,28]. Piezoelectric actuators are other devices with an increasing application in rotor systems, they represent an alternative because their main characteristics: very precise movement, compact, high force, low energy consumption, quick response time, no electromagnetic interference.…”

Vibration Reduction and Power Generation with Piezoceramic Sheets Mounted to a Flexible Shaft

“…In cases where these means are exhausted, active control methods for rotor balancing and damping provide a solution. Such methods have been the topic of research for a few decades (Sahinkaya and Burrows, 1985;Knospe et al, 1995;Zhou and Shi, 2001).…”