Dynamic Performance Characteristics of Misali...

Dynamic Performance Characteristics of Misaligned Hybrid Journal Bearing Using Micropolar Lubricant

Author Name : Preeti, Sanjeev

The hybrid bearings are designed to take maximum advantage of hydrostatic and hydrodynamic effect and offer some very attractive features such as zero start up wear, good bearing film stiffness at zero speed and high load capacity at higher speeds. An analytical study concerning the effect of misalignment on the hole-entry hybrid journal bearing with double row of twelve holes in each row (symmetric configuration) operating with micropolar has been presented.
The modified Reynold’s equation governing the lubricant flow field in the clearance space of the journal bearing has been solved to find the performance characteristics like pressure distribution, minimum fluid film thickness, direct stiffness coefficients, cross stiffness coefficients, direct damping coefficients, cross damping coefficients, critical mass and threshold speed of a capillary compensated hybrid journal bearing. Static and dynamic performance characteristics are presented for the different representative values of the journal misalignment and micropolar parameters for hybrid mode of operation of the bearing. The study suggests that the journal misalignment significantly affects the performance of the hole-entry journal bearing and for a more accurate prediction of the bearing performance, it must be considered in the analysis.