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The Influence of Orifice Restriction on the Stability of Rigid Rotor-Aerostatic Bearing System

[+] Author Affiliations
Cheng-Hsien Chen

Army Academy R.O.C., Jungli, Taiwan

Ding-Wen Yang

Vanung University, Jungli, Taiwan

Yuan Kang

Chung Yuan Christian University, Jungli, Taiwan

Ren-Ming Hwang, Shrh-Shyong Shyr

Chung-Shan Institute of Science and Technology, Jungli, Taiwan

Paper No. GT2009-59739, pp. 909-917; 9 pages
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4887-6 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME


This paper has studied the influence of the restriction effect on the stability of a rigid rotor in rotation supported by double-row, orifice compensated aerostatic bearings. The air which is assumed to be perfect gas, passes through orifice restrictor into the bearing clearance undergoing the adiabatic process is governed by Reynolds equation including the coupled effects of wedge due to spindle rotation and squeezed film due to journal oscillation. The Ph-method is used to analyze Reynolds equation and which is then solved by the finite difference method and numerical integration to yield static and dynamic characteristics of air film. The motion equation of the rotor-bearing system is obtained by using the perturbation method and the eigensolution method is used to determine the stability threshold and critical whirl ratio. The variations of stability threshold of both critical inertial force and critical whirl ratio with restriction parameters are analyzed for various whirl ratios, speed of journal rotation and eccentricity ratios.

Copyright © 2009 by ASME
Topics: Stability , Bearings , Rotors



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