The Design of Externally Pressurized Gas Thrust Bearings for Maximum Stiffness and Stability

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Abstract
Relations governing the common forms of externally pressurized (EP) bearings are reviewed and a simple formula is derived which allows the bearing stiffness to be calculated directly from known parameters. Pneumatic instability is discussed, and the importance of land area for stable operation emphasized. Measurement techniques are described and some experimental data presented to support the theory. It is shown that, under proper conditions, the film thickness of an EP bearing can be relatively independent of linear surface velocity.

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