Dynamic Characteristics of a Hydrostatic Gas Bearing Driven by Oscillating Exhaust Pressure

[+] Author and Article Information
C. B. Watkins, I. E. Eronini

Department of Mechanical Engineering, Howard University, Washington, D.C.

H. D. Branch

National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, Md.

J. Tribol 106(4), 477-483 (Oct 01, 1984) (7 pages) doi:10.1115/1.3260968 History: Received August 08, 1983; Online October 29, 2009


Vibration of a statically loaded, inherently compensated hydrostatic journal bearing due to oscillating exhaust pressure is investigated. Both angular and radial vibration modes are analyzed. The time-dependent Reynolds equation governing the pressure distribution between the oscillating journal and sleeve is solved together with the journal equation of motion to obtain the response characteristics of the bearing. The Reynolds equation and the equation of motion are simplified by applying regular perturbation theory for small displacements. The numerical solutions of the perturbation equations are obtained by discretizing the pressure field using finite-difference approximations with a discrete, nonuniform line-source model which excludes effects due to feeding hole volume. An iterative scheme is used to simultaneously satisfy the equations of motion for the journal. The results presented include Bode plots of bearing-oscillation gain and phase for a particular bearing configuration for various combinations of parameters over a range of frequencies, including the resonant frequency.

Copyright © 1984 by ASME
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