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Simplified Morton Effect Analysis for Synchronous Spiral Instability

[+] Author Affiliations
Brian T. Murphy

University of Texas, Austin, TX

Joshua A. Lorenz

Kato Engineering, Mankato, MN

Paper No. POWER2009-81030, pp. 241-247; 7 pages
  • ASME 2009 Power Conference
  • ASME 2009 Power Conference
  • Albuquerque, New Mexico, USA, July 21–23, 2009
  • Conference Sponsors: Power Division
  • ISBN: 978-0-7918-4350-5 | eISBN: 978-0-7918-3853-6
  • Copyright © 2009 by ASME


A simplified analytical approach for modeling the synchronous instability phenomenon known as Morton effect is presented. The analysis is straight forward and easily applied to any rotor supported on fluid film bearings. The analysis clarifies the interaction of three distinct machine characteristics which combine to create a case of Morton effect. Some example calculations are shown illustrating the possible types of spiral vibration. In addition, an analytical approach is described for estimating the magnitude of the shaft temperature difference in a journal bearing as a direct function of the shaft orbit. It is significant that this method can readily be applied to any type of journal bearing, from plain sleeve bearings to tilting pad bearings. Example calculations using the method are shown.

Copyright © 2009 by ASME



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