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Identification of Nonlinear Instabilities in Rotors Supported on Gas Bearing

[+] Author Affiliations
Claudia Aide González, Juan Carlos Jáuregui

Universidad Autonoma de Queretaro, Queretaro, QUE, Mexico

Oscar de Santiago

CIATEQ, A.C., Queretaro, QUE, Mexico

Paper No. GT2014-27215, pp. V07AT31A035; 8 pages
doi:10.1115/GT2014-27215
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 7A: Structures and Dynamics
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4576-9
  • Copyright © 2014 by ASME

abstract

Identifying the parameters that cause gas bearing instabilities is a big challenge. The gas properties are very sensitive to temperature and pressure changes, and, as a consequence the bearing rotor-dynamic coefficients change drastically and the rotor behaves chaotically, which means that the dynamic parameters are nonlinear. In this research a methodology to identify nonlinear instabilities of gas bearings is presented. Estimating variations of the coefficients can be done using wavelets and the phase diagram. Wavelets allow the development of time-frequency maps where the behavior of each of the system frequencies can be analyzed. The time-frequency map displays frequency variations as a function of time. In this way, any change in the rotor dynamic parameter is reflected as variations in its associated frequency. Analyzing these variations it is possible to estimate the nonlinear parameters. With the phase diagram analysis, it is possible to evaluate changes in the dynamic behavior. The phase diagram relates the potential energy and kinetic energy at any time instant. If the system is stable, the phase diagram has a well define pattern that repeats steadily; whereas, if the pattern shows sudden changes in dimensions and shape, it indicates that the system parameters have change. This change may be chaotic.

Copyright © 2014 by ASME
Topics: Rotors , Gas bearings

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