The restrictive effects of orifice compensation on the stability of the Jeffcott rotor-hybrid bearing system

This study examines the influence of the restriction parameters on the stability of a Jeffcott rotor supported by single-row, six-recessed hybrid bearings with orifice compensation. The Reynolds equation governing oil-films is solved using the finite difference method, whilst the determination of stability of the Jeffcott rotor-bearing system uses the Routh-Hurwitz method. The load capacity, stability threshold, and the critical whirl ratio versus the changing restriction parameters, are each simulated for the shallow-recessed bearing and the deep-recessed bearing with various land-width ratios. The simulation results indicate that with the appropriate design of restriction parameters and land-width ratio, a deep-recessed bearing may be relatively superior. Although the performance of a shallow-recessed bearing is, by and large, superior to that of a deep-recessed bearing, it does nevertheless hinge upon the design of both restrictor and bearing.