Analysis of Dynamic Coefficients for Multirecess Hydrostatic Journal Bearings with Journal Rotation by Finite Element Method
Hydrostatic journal bearings are extensively used as supports of spindle in high precision machine tools because of their high rigidity and stable rotational accuracy. It is of great importance to predict the dynamic behaviour of hybrid journal bearings subjected to an external force with a given excitation frequency, because the presence of cross-coupling terms can have a significant effect on the dynamic response and stability of hydrostatic spindles, especially, owing to the fact that if the cross-coupling stiffness is different from zero, the hybrid journal bearing is not always stable. An analysis of dynamic characteristics of a capillary-compensated four-recesses hybrid journal bearing, taking into account compressibility of the lubricant in the bearing recesses and lubricant inertia in the bearing capillary resistor, is presented.
KeywordsExcitation Frequency Journal Bearing Reynolds Equation Dynamic Coefficient Hydrostatic Spindle
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