Externally-pressurized gas-lubricated floating-ring porous journal bearings

A new type of gas-lubricatedfloating-ring journal bearing in which thefixed bearing and the ring are both porous, has been conceived and analysed, theoretically, for the steady state Characteristics. Bearing characteristics are presented against two design parameters, namely, clearances ratio and permeability parameter. The comparison of these characteristics with those of externally-pressurized plain porous journal bearings shows that the new bearing represents, with its steady state performance, a distinctly advanced bearing design. NOTATION The dimensional quantities are represented by barred symbols. A symbol without a bar refers only to the non-dimensional quantity. radial clearance in plain bearing, clearance of the inner film when ring and journal are con-centric (m) (Fig. 1) clearance of the outer film when ring and bearing are concentric (m) (Fig. 1) C2/C1, clearances ratio FixAy pa R2, film force components (N) hi C, , film thicknesses (m) hminC1, minimum film thickness (m) H, R, thicknesses of the ring and the bearing shell (m) [ = 1, 21 subscripts for the inner and the outer clearance spaces, also for the ring and the bearing shell ambient pressure (N/m2) p i pa, pressures (subambient) in the clearance spaces (N/m2) pi * pa, pressures (subambient) in porous media of the ring and the bearing shell (N/m2) p, pa, supply pressure (N/m2) P, ijR4w2/C, , viscous frictional power loss (W) QpR2C