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Understanding the Effect of Systematic Errors on the Accuracy of Experimental Measurements of Fluid-Film Bearing Dynamic Coefficients

[+] Author Affiliations
Benstone Schwartz, Roger Fittro, Carl Knospe

University of Virginia, Charlottesville, VA

Paper No. GT2017-64665, pp. V07AT34A028; 13 pages
doi:10.1115/GT2017-64665
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 7A: Structures and Dynamics
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5092-3
  • Copyright © 2017 by ASME

abstract

Designing high-performance industrial machinery with fluid-film bearings for safe and stable operation relies on accurate stability prediction. One element of accurate stability prediction is fluid-film bearing properties. Bearing codes are utilized to predict fluid-film bearing properties and these prediction models are validated using various test rigs. Due to systematic errors present in test rigs, estimated bearing coefficients have associated uncertainty. Uncertainty in fluid-film bearing coefficient estimation due to displacement measurement error, force measurement error, and rotor flexibility is analyzed. A single-degree-of-freedom system model is analyzed to understand trends in uncertainties. Computer modeling software is used to develop a modular, high-fidelity model to analyze a test rig for worst-case uncertainty in fluid-film bearing coefficient estimation for a tilting-pad journal bearing. The results show that for high excitation frequencies the uncertainty is large enough that estimated coefficients are practically useless.

Copyright © 2017 by ASME

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