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Insights Into Discrepancies Between Results of Nonlinear and Linear Vibration Analyses of Rigid Rotors on Journal Bearings

[+] Author Affiliations
Demetrio C. Zachariadis

University of São Paulo, São Paulo, SP, Brazil

Paper No. GT2008-51084, pp. 1237-1246; 10 pages
doi:10.1115/GT2008-51084
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 5: Structures and Dynamics, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4315-4 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

A comparison between results of nonlinear and linear vibration analyses of rigid rotors supported on hydrodynamic journal bearings and subjected to standard unbalance loads shows that the discrepancies are relevant. Such discrepancies are attributed to the incompatibility between the vibration levels caused by these standard unbalance loads and the assumption of the existence of static equilibrium positions for the calculation of stiffness and damping coefficients.

Copyright © 2008 by ASME

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