Comportamento Dinâmico de Mancais Segmentados Axiais sob Regime de Lubrificação Híbrido

Abstract

The present contribution aims to evaluate the effects of the oil pressure injection on the dynamic behavior of a hybrid-lubricated tilting-pad thrust bearing. Firstly, a thermohydrodynamic (THD) model is applied to determine the equilibrium position associated with the pressure and temperature distributions resulting from both hydrodynamic and hybrid lubrication regimes. Subsequently, the perturbation and frequency reduction methods are applied to determine the stiffness and damping coefficients of the bearing for various operational conditions. The obtained results show that the dynamic force coefficients are strongly dependent on the operational conditions of the bearing, such as the static load and rotating speed, as well as the perturbation frequency, for both lubrication regimes. The quantification of the injection pressure influence on the force coefficients of hybrid-lubricated thrust bearings is the main original contribution of this work.