Linear stability analysis of hydrodynamic journal bearings under micropolar lubrication

• Published in: Tribology international Vol. 38; no. 5; pp. 500 - 507
• Main Authors: Das, S., Guha, S.K., Chattopadhyay, A.K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2005; Elsevier
• Subjects: Applied sciences; Bearings, bushings, rolling bearings; Drives; Exact sciences and technology; Friction, wear, lubrication; Hydrodynamic journal bearings; Linear analysis; Machine components; Mechanical engineering. Machine design; Micropolar fluid; Perturbation technique; Stability parameter; Hydrodynamic journal bearings; Perturbation technique; Micropolar fluid; Linear analysis; Stability parameter; Hydrodynamic characteristic; Dynamic characteristic; Eccentricity; Damping coefficient; Layer thickness; Modeling; Steady state; Spring mass system; Hydrodynamic lubrication; Perturbation method; Newtonian fluid; Reynolds equation; Journal bearing; Dynamic pressure; Tribology
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2004.08.023

The dynamic characteristics of hydrodynamic journal bearings lubricated with micropolar fluids are presented. The modified Reynolds equation is obtained using the micropolar lubrication theory. Applying the first order perturbation of the film thickness and steady state film pressure, the dynamic characteristics in terms of the components of stiffness and damping coefficients, critical mass parameter and whirl ratio are obtained with respect to the micropolar property for varying eccentricity ratios and slenderness ratios. The results show that micropolar fluid exhibits better stability in comparison with Newtonian fluid.