Abstract
In this paper, we investigated the influence of slip velocity on the characteristics of an externally pressurized annular porous gas thrust bearing, which has a thin restricted surface layer. From numerical calculation, it is found that the slip velocity increases flow rate and decreases load capacity. It is also found that the static characteristics can be easily calculated from those of the case without slip velocity. In the range of practically used porous feeding parameter, the slip velocity increases dynamic stiffness at low and moderate squeeze numbers and decreases dynamic stiffness at high squeeze numbers. It decreases positive extreme value of damping and damping ratio at high squeeze number. The influence of slip velocity on dynamic characteristics becomes significant when the porous surface is restricted strongly. This means that the influence of slip velocity should be considered in designing a bearing when the dynamic characteristics is important.
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