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This paper investigates the relationship between eight linear oil-Jilm force coeflcients of circular journal bearings and the perturbation amplitudes. The force coeJ, ' , cienls are caln~lated by the Jinite perturbation method and compared zuith those calnclaled by the inJiriitesimal perturbation method. Numerical experiments show that the calculated results from bothjnite pertz~rbation and inJinilesima1 perturbation methods are very close (with n variation less than 0.1 %) when the perturbation amplitudes are less than 0 . 0 2~ (displacement) or O.02flc (velocity) for normal bearing eccenlricities. For eccenlricities betrueen 0.2 and 0.8, the calculated coefJiciats by the Jinile perturbation method will d q e r less than 2.5 % from the results by the injinitesimal perturbation method iJ the perturbation ampliFinal manuscript approved April 13, 1995 lude is less than 0 . 0 5~ or O.04flc. The bearing cocS/icie~~ts mlntlrcled by thejnite perturbation method under diJJerent fierlurbation n~n/)litudes are presented graphically.

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This paper solves the Reynolds equation by the finite difference method in a fixed coordinate system with the static load acted in the vertical direction. All static and dynamic characteristics (including load capacity, attitude angle, side flow, friction force, misaligned moments, and eight linear force coefficients) of a horizontally grooved bearing under different eccentricity and misalignment conditions are presented and compared with available experimental data. The effects of misalignment on all these bearing characteristics and on the stability of the rotor-bearing system are analyzed.