A model has been developed to compute the dynamic stiffness and damping properties of externally pressurized, porous-wall, gas journal bearings. The derivation of this model is described in a companion paper. A special test apparatus was constructed to experimentally investigate the steady and unsteady characteristics of a 51-mm diameter by 51-mm long journal bearing. Tests are described for a bearing pressurized to 0.412 MN/m2 at journal speeds up to 20,000 rpm over a range of clearances. Experimental results are compared to those of the theoretical model and show good quantitative agreement for diametral clearances of 25 μm and larger. Reasonable qualitative agreement is shown for smaller clearances. In addition, an unstable vibration phenomenon was discovered and briefly investigated.

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