ON PARALLEL HYBRID GUIDE BEARINGS UNDER COMBINED SLIDING AND SMALL AMPLITUDE VIBRATION

An original hybrid bearing model, operating under constant volumetric incompressible lubricant supply rate Q(), is proposed for 2-D paralle l hybrid guide bearings subject to simultaneous translation and small amplitude transverse vibration. The model may describe the typical flu id film constrained between a translating/rotating saw blade and a saw guide, where lubricant is fed directly into the oscillating film. The inner boundary, or recess, pressure is time varying and coupled to th e external lubricant supply. Unsteady fluid inertia resulting from vib ration is measured by the squeeze Reynolds' number Re, and modeled. A methodology for analytical solution is developed to predict the amplit ude and phase of the dynamic bearing load W-t(). A sample hybrid bear ing, used to demonstrate the film pressure generating mechanisms in hy brid squeeze film, generates a 1.1 to 7.1 percent larger W-t() with a 5 to 21 deg phase lag for 1 less than or equal to Q() less than or e qual to 4 when compared to W-t() produced in a hydrodynamic squeeze f ilm bearing at the same Re-5. This phase shift can be significant when bearings are used for vibration control purposes.