Research on oil film stiffness coefficient of slot throttling hydrostatic bearing
Oil film stiffness coefficient is one of the key performance parameters of hydrostatic bearing.In the context of slot throttling hydrostatic bearing,the analytical expression for the oil film load capacity was deduced,and the analytical expression for the oil film stiffness coefficient was further derived on this basis.Compared with conventional empirical formula,the calculated results from this expression were in better agreement with the experimental results.Through the analysis of application cases,it could be seen that the oil film load capacity was positively correlated with throttling parameters and spindle eccentricity.The positive oil film stiffness coefficient decreased with the increase of eccentricity,whereas the cross oil film stiffness coefficient increased with the increase of eccentricity,and the positive stiffness coefficient was obviously greater than the cross stiffness coefficient.By using the expression for oil film stiffness coefficient of bearing,the oil film stiffness coefficient can be obtained in real time by measuring the bearing shaft center position in the running process of the bearing,and the operation of the slot throttling hydrostatic bearing can be effectively monitored.
hydrostatic bearingslot throttlingoil film stiffness coefficientoil film load capacityjournal center position
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