Analysis of Rotor Stability Supported by Surface Porous Layered Journal Bearing
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An analysis of modified Reynolds equation for surface porous layer configuration based on short (Ocvirk) bearing approximation is presented under dynamic conditions. The steady state pressure and dynamic pressure gradients are analyzed using Lund’s perturbation method. The nondimensional parameters of film thickness ratio of surface porous layers, dynamic viscosity ratio of surface layers, and permeability of porous layers are considered in the analysis. The stiffness and damping coefficients, threshold (critical) speed and whirl ratio (critical) for layered bearings are presented. An improvement in critical (threshold) speed of layer (film) journal bearings is evaluated.
KeywordsSurface porous layer Dynamic analysis Critical speed Whirl ratio
- 3.T.V.V.L.N. Rao, Stabilization of journal bearing using two-layered film lubrication. J. Tribol. 134, 014504 (2012)Google Scholar
- 13.J.W. Lund, K.K. Thomsen, A calculation method and data for the dynamic coefficients of oil-lubricated journal bearings, in Topics in ‘Fluid Film Bearing and Rotor Bearing System Design and Optimization (ASME, New York, 1978), pp. 1–28Google Scholar
- 14.J.S. Rao, Rotor Dynamics (New Age International (P) Limited, New Delhi, 2009)Google Scholar