Journal Bearings are excellent bearings due to their large load carrying capacity and favorable damping characteristics. However, Journal bearings are known to be prone to instabilities. The oil whirl and oil whip instabilities limit the rotor maximum rotating speed. In this paper, a novel approach is used to control the Journal bearing (JB) instability. An Active Magnetic Bearing (AMB) is used to overcome the JB instability and to increase its range of operation. The concept is quite simple: rather than using the AMB as a load carrying element, the AMB is used as a controller only, resulting in a much smaller and more efficient AMB. The load carrying is done by the Journal bearings, exploiting their excellent load carrying capabilities, and the JB instability is overcome with the AMB. This results in a combined AMB/JB that exploits the advantages of each device, and eliminates the deficiencies of each bearing. Different controllers for the AMB to control the JB instability are examined and compared theoretically and numerically. The possibility of collocating the JB and the AMB is also examined. The results illustrate the effectiveness of the concept.
Skip Nav Destination
ASME Turbo Expo 2007: Power for Land, Sea, and Air
May 14–17, 2007
Montreal, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4794-2
PROCEEDINGS PAPER
Controlling Journal Bearing Instability Using Active Magnetic Bearings Available to Purchase
A. S. Dimitri
A. S. Dimitri
Cairo University, Giza, Egypt
Search for other works by this author on:
A. El-Shafei
Cairo University, Giza, Egypt
A. S. Dimitri
Cairo University, Giza, Egypt
Paper No:
GT2007-28059, pp. 983-993; 11 pages
Published Online:
March 10, 2009
Citation
El-Shafei, A, & Dimitri, AS. "Controlling Journal Bearing Instability Using Active Magnetic Bearings." Proceedings of the ASME Turbo Expo 2007: Power for Land, Sea, and Air. Volume 5: Turbo Expo 2007. Montreal, Canada. May 14–17, 2007. pp. 983-993. ASME. https://doi.org/10.1115/GT2007-28059
Download citation file:
11
Views
Related Proceedings Papers
Related Articles
Controlling Journal Bearing Instability Using Active Magnetic Bearings
J. Eng. Gas Turbines Power (January,2010)
Three Practical Examples of Magnetic Bearing Control Design Using a Modern Tool
J. Eng. Gas Turbines Power (October,2002)
Stability, Load Capacity, Stiffness, and Damping Advantages of the Double Pocket Journal Bearing
J. Tribol (January,1985)
Related Chapters
Introduction
Design of Mechanical Bearings in Cardiac Assist Devices
Hydrodynamic Lubrication
Design of Mechanical Bearings in Cardiac Assist Devices
Summary and Conclusions
Bearing Dynamic Coefficients in Rotordynamics: Computation Methods and Practical Applications