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TECHNICAL PAPERS

Low-Order Models for Very Short Hybrid Gas Bearings

[+] Author and Article Information
N. Savoulides, S. Jacobson, F. F. Ehrich

Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, Massachusetts

K. S. Breuer

Division of Engineering, Brown University, Providence, Rhode Island

J. Tribol 123(2), 368-375 (Jun 16, 2000) (8 pages) doi:10.1115/1.1308000 History: Received February 15, 2000; Revised June 16, 2000
Copyright © 2001 by ASME
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References

Figures

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Gas bearing geometry and nomenclature
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Microbearing schematic: The aft plate consists of two separate plena which can be pressurized to any desired pressure, PPH and PPL. By applying different pressures to the plena the journal is side-loaded.
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Hydrodynamic stiffness coefficient K̄xx for Λ=0.25, 0.5, 1.0, and 2.0 45
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Hydrostatic natural frequency versus the axial pressure difference 4
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Functional dependence of variables in solution procedure
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Hydrodynamic stability boundaries, on the ξ-Λ plane, for M̄=0.4, 0.9, and 2.0. (a) Based on the low-order model and (b) based on a full numerical simulation 4.
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Gauge pressures for α=0.3, and Padd=0
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Performance characteristics, using α=0.3, and Padd=0. (a) normalized damping of the bearing. (b) Critical speed ratio as a function of the eccentricity ratio. (c) Eccentricity ratio.
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Performance characteristics, using α=0.4, and Padd=0. (a) Normalized damping of the bearing. (b) Critical speed ratio as a function of the eccentricity ratio. (c) Eccentricity ratio.
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Performance characteristics, using α=0.4, and Padd=1. (a) Normalized damping of the bearing. (b) Critical speed ratio as a function of the eccentricity ratio. (c) Eccentricity ratio.
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Performance characteristics, using α=0.4, and Padd=2. (a) Normalized damping of the bearing. (b) Critical speed ratio as a function of the eccentricity ratio. (c) Eccentricity ratio.

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