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 parallel hybrid guide bearings subject to simultaneous translation and small amplitude transverse vibration. The model may describe the typical fluid 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 the external lubricant supply. Unsteady fluid inertia resulting from vibration is measured by the squeeze Reynolds’ number Re_s and modeled. A methodology for analytical solution is developed to predict the amplitude and phase of the dynamic bearing load W_t*. A sample hybrid bearing, used to demonstrate the film pressure generating mechanisms in hybrid squeeze film, generates a 1.1 to 7.1 percent larger W_t* with a 5 to 21 deg phase lag for 1 ≤ Q* ≤ 4 when compared to W_t* produced in a hydrodynamic squeeze film bearing at the same Re_s. This phase shift can be significant when bearings are used for vibration control purposes.