Control System Design for Flexible Rotors Supported by Actively Lubricated Bearings

This article presents a methodology for calculating the gains of an output feedback controller for active vibration control of flexible rotors. The methodology is based on modal reduction. The proportional and derivative gains are obtained by adjusting the first two damping factors of the system and...

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Bibliographic Details
Published in:Journal of vibration and control 2008-03, Vol.14 (3), p.347-374
Main Authors: Nicoletti, R., Santos, I.F.
Format: Article
Language:English
Subjects:
Active control
Active damping
Analysis
Control systems
Controllers
Damping
Eigenvalues
Feedback control
Journal bearings
Mathematical analysis
Methodology
Output feedback
Position (location)
Response functions
Rotors
Systems design
Unbalance
Velocity
Vibration
Vibration control
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Summary:This article presents a methodology for calculating the gains of an output feedback controller for active vibration control of flexible rotors. The methodology is based on modal reduction. The proportional and derivative gains are obtained by adjusting the first two damping factors of the system and keeping the lengths of the two eigenvalues constant in the real-imaginary plane. The methodology is applied to an industrial gas compressor supported by active tilting-pad journal bearings. The unbalance response functions and mode shapes of the flexible rotor with and without active control are presented, showing significative improvement in damping reserve with the control. The importance of sensor location is emphasized, on the basis of the energy necessary to operate the active system over the entire frequency range studied. The best results are obtained by a decentralized controller, observing displacement and velocity of the shaft at the bearing positions.
ISSN:1077-5463
1741-2986
DOI:10.1177/1077546307080014