ON PARALLEL HYBRID GUIDE BEARINGS UNDER COMBINED SLIDING AND SMALL AMPLITUDE VIBRATION WITH PRESSURE-REGULATED LUBRICANT SUPPLY

A linear pressure-regulated hybrid bearing model, featuring a laminar restrictor R(c) that links the bearing recess to a constant supply pre ssure p(s) is proposed for two-dimensional parallel guide bearings ope rating under combined translation and small amplitude transverse vibra tion. The model describes the fluid film constrained between a running saw blade and a saw guide or that in many other hybrid thrust bearing designs. The film pressure is generated by coupled hydrostatic and hy drodynamic lubrication. Unsteady fluid inertia, resulting from vibrati on, is modeled using the squeeze Reynolds number Re(s). The amplitude and phase of the dynamic bearing load W(t) and the oscillating flowrat e component Q(t) are analytically predicted and the load-generating me chanisms are identified. Predictions by the current model converge to those of the constant volumetric lubricant supply rate model, discusse d in an earlier paper (S.H. Chen and C.D. Mote, Jr., On parallel hybri d guide bearings under combined sliding and small amplitude vibration, ASME J. Tribol., 116 (1994) 127-132), when p(s) --> infinity, R(c) -- > infinity and p(s)R(c) --> Q = constant. Predictions by the current m odel reduce to those of a parallel hydrodynamic squeeze film model whe n R(c) --> 0.