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Experimental Identification of Force Coefficients of Large Hybrid Air Foil Bearings

[+] Author Affiliations
Yu Ping Wang, Daejong Kim

University of Texas at Arlington, Arlington, TX

Paper No. GT2013-95765, pp. V07BT30A026; 10 pages
doi:10.1115/GT2013-95765
From:
  • ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
  • Volume 7B: Structures and Dynamics
  • San Antonio, Texas, USA, June 3–7, 2013
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5527-0
  • Copyright © 2013 by ASME

abstract

Foil bearing technology using air or gas as a lubricant has been around since the mid 60’s, and it made significant progress in its reliability, performance, and applications. Even if significant progress has been made to the technology, their commercial applications to relatively large machines with journal shaft diameter bigger than 100mm was not reported. This paper presents dynamic characteristics of hybrid (hydrodynamic + hydrostatic) air foil bearing (HAFB) with diameter of 101.6mm and length of 82.6mm. The test rig configuration in this work is a floating HAFB on a rotating shaft driven by electric motor, and the HAFB is under external load.

HAFB stiffness coefficients were measured using both 1) time-domain quasi-static load-deflection curves, and 2) frequency-domain impulse responses, and HAFB damping coefficients were measured using only impulse responses. The HAFB direct stiffness coefficients measured from both methods are close to each other in the range of 4∼7 MN/m depending on speed, load, and supply pressure, but frequency domain method shows larger scatter in the identified coefficients. HAFB coefficients simulated with linear perturbation method using a bump stiffness matched to the load-deflection characteristics at 18,000rpm show reasonably good agreements with experimentally measured values.

Copyright © 2013 by ASME
Topics: Foil bearings

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