Stability of rotors supported by tilting pad journal bearings

Author:
Cloud, Charles Hunter, Mechanical and Aerospace Engineering, University of Virginia
Advisors:
Barrett, Lloyd, School of Engineering and Applied Science, University of Virginia
Eric A., Maslen, School of Engineering and Applied Science, University of Virginia
Paul E., Allaire, School of Engineering and Applied Science, University of Virginia
Edgar J., Gunter, School of Engineering and Applied Science
John A., Kocur, School of Engineering and Applied Science, University of Virginia
Abstract:

Rotor instability, a self-excited vibration phenomenon, remains a serious and costly problem with turbomachinery. Avoidance is attempted through rotordynamic modeling as well as testing. However, large modeling uncertainties exist, and common shop testing methods provide no correlation with predictions. For tilting pad journal bearings, the central uncertainty lies in whether or not they should be represented with frequency dependent dynamics. The two existing representations, one being a simplification of the other, can produce very different stability predictions. Such predicted differences suggest that stability testing should be an effective platform for distinguishing between the two representations. A method for stability measurement of rotor systems is developed in this investigation.

Degree:
PHD (Doctor of Philosophy)
Keywords:
turbomachinery, rotordynamics
Language:
English
Rights:
All rights reserved (no additional license for public reuse)
Issued Date:
2007