NONLINEARITIES IN MISALIGNED JOURNAL BEARINGS

An analysis of hydrodynamic Newtonian lubrication for misaligned journ al bearings is given. The primary aim of this paper is to model the no n-linearities that occur in a hydrodynamic journal bearing in both ali gned and misaligned conditions, and to present the non-linear stiffnes s, damping and hybrid coefficients in the form of diagrams that can be used in a dynamic analysis of journal bearings. The Reynolds equation is solved using the finite element solution technique. A two-dimensio nal Newton-Raphson method is used to locate the journal equilibrium po sition from which both linear and non-linear bearing dynamic coefficie nts are evaluated by means of the small perturbation technique. The be ar ng dynamic coefficients, linear and non-linear, due to displacement s and to rotations for partial arc, and full journal bearing are calcu lated for various L/D ratios and misalignment conditions. The effects of misalignment on the linear and non-linear plain journal bearing cha racteristics are analysed and presented.