Numerical Determination of the Frictional Coefficients of a Fluid Film Journal Bearing Considering the Elastohydrodynamic Lubrication and the Asperity Contact Force

This paper proposes a numerical method to investigate the frictional characteristics of fluid film journal bearing considering elastohydrodynamic lubrication and asperity contact force. We solved average Reynolds equation by utilizing FEM determine hydrodynamic force developed lubricant bearing. also used modified GT model (Greenwood–Tripp model) Greenwood Tripp decompose into normal tangential directions. Once we applied those forces rotor, equations motion flexible shaft friction coefficient. verified proposed comparing calculated coefficient with measured one bearings conducted prior researchers. Then, was scroll compressor on which dynamic loads are applied. can contribute developing robust rotor systems supported bearings.