Abstract
Hydrostatic journal gas bearing with a large pocket in the bearing surface and with fluid damper has high stiffness without causing pneumatic hammer instability. But the settling time cannot be lower than two or three times of natural period time owing to the large pocket volume even if the damping coefficient of fluid damper can be set high. In this paper, the settling time of hybrid restrictor type hydrostatic journal gas bearings is investigated. The stiffness of hybrid type is about 60% less than that of pocket type, and the pocket volume of this type, where pocket depth is about two or three times as deep as bearing clearance, is about 2-5% of the pocket volume of the pocket type. The following conclusion is obtained : the settling time of hybrid type can be set to one natural period time (critical damping) by the use of the appropriate damping coefficients of fluid damper.
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