Determinação de características de desempenho de mancais radiais elípticos utilizando o método de elementos finitos

AUTOR(ES)

Fernando de Assis G. Correia

DATA DE PUBLICAÇÃO

2007

RESUMO

This work presents the determination of the performance characteristics of hydrodynamic oil lubricated journal bearings of fixed geometry, with elliptical profile using the finite element method. A finite element procedure based on the Galerkin weighted residual method is developed from the classical Reynolds Equation for incompressible fluids. A linearized perturbation scheme is applied on the governing equation to render the zero-th and first-order lubrication equations, which permit to determine the bearing steady-state and dynamic performance characteristics of interest. The hydrodynamic pressure distribution on the fluid film is obtained by solving the zero-th order lubrication and is integrated over the fluid domain to render the bearing carrying-load capacity. The fluid film domain is modeled using four-node isoparametric finite elements. The fluid film reaction force and stiffness and damping coefficients are evaluated for elliptical journal bearings at several operating conditions. Performance characteristic curves, such as bearing load capacity and dynamic force coefficients, are obtained in relation to operating parameters and Sommerfeld number. The finite element predictions for elliptical journal bearing behavior show that non-cylindrical journal bearings present higher direct stiffness than that produced by cylindrical journal bearings, indicating that elliptical bearings are slightly more stable than cylindrical bearings.

ASSUNTO(S)

engenharia mecânica teses. projetos mecânicos teses. método dos elementos finitos teses.

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