Squeezed Film Effect Research Papers (original) (raw)

A generalized Reynolds equation, in which is adopted specified rheological model to express the non-Newtonian properties of the lubricant, is derived for journal bearing with finite length. The shaft is covered with a thin resilient layer, whose elastic distortions are of the same order of magnitude as the film thickness. The 2-D non-steady EHD problem is investigated under elasticity conditions in accordance to the Vlassov model of an elastic foundation. It is used an adiabatic solution of the thermal problem. The viscosity - pressure, temperature relationship, proposed by Roelands, is employed. The numerical solutions are carried out to the incorporated the Reynolds, elasticity, energy and state equations for pressure, deformations and film thickness. The results are obtained for prescribed loci of the shaft center.

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- Tribology (Engineering), Tribology, Elasto-Hydrodynamic Lubrication, Squeezed Film Effect

The study is performed using a designed and verified model of a dynamically loaded journal bearing with finite length. The shaft is covered with a thin elastic coating, whose radial distortions are of the same order of magnitude as the film thickness. The 2-D non-steady EHD problem is investigated for the case of elastic layer on rigid foundation, such the displacements are calculated without linear approximations. To this end a new, more precise method of determination of the deflections is used. An energy equation governing the temperature distribution is referring to an adiabatic regime. It is assumed, that the dynamic viscosity of the lubricant is function of the pressure and the temperature by Roelands. The results for the basic bearing characteristics (load capacity, required oil flow and resultant friction force) are presented. The solution is obtained for prescribed loci of the shaft centre, which corresponds of squeeze film effect.