Effects of fluid compressibility on the dynamic response of hydrostatic journal bearings
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A theoretical analysis for the dynamic performance characteristics of laminar flow, capillary and/or orifice compensated hydrostatic journal bearings is presented. The analysis considers in detail the effect of fluid compressibility in the bearing recesses. At high frequency excitations beyond a break frequency the bearing hydrostatic stiffness increases sharply and is accompanied by a rapid decrease in direct damping. Also, the potential of pneumatic hammer instability (negative damping) at low frequencies is likely to occur in hydrostatic bearing applications handling highly compressible fluids. Useful design criteria for avoiding undesirable dynamic operating conditions at low and high frequencies are determined. The effect of fluid recess compressibility is brought into perspective, and found to be of utmost importance to the entire frequency spectrum response and stability characteristics of hydrostatic and hybrid journal bearings. © 1991.
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