{"title":"EHD Effect on the Dynamic Characteristics of a Journal Bearing Lubricated with Couple Stress Fluids","authors":"B. Chetti, W. A. Crosby ","volume":117,"journal":"International Journal of Civil and Environmental Engineering","pagesStart":1103,"pagesEnd":1109,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10005222","abstract":"
This paper presents a numerical analysis for the dynamic performance of a finite journal bearing lubricated with couple stress fluid taking into account the effect of the deformation of the bearing liner. The modified Reynolds equation has been solved by using finite difference technique. The dynamic characteristics in terms of stiffness coefficients, damping coefficients, critical mass and whirl ratio are evaluated for different values of eccentricity ratio and elastic coefficient for a journal bearing lubricated with a couple stress fluids and a Newtonian fluid. The results show that the dynamic characteristics of journal bearings lubricated with couple stress fluids are improved compared to journal bearings lubricated with Newtonian fluids.<\/p>\r\n","references":"[1]\tT. T. Ariman, N. D. Sylverster, \u201cMicrocontinuum fluid mechanics-a review\u201d Int. J. Eng. Sci, Vol. 11, pp. 905-930, 1973.\r\n[2]\tT. T. Ariman, N. D. Sylverster, \u201cApplication of microcontinuum fluid mechanics\u201d Int. J. Eng. Sci., Vol. 12, pp. 273-293, 1974.\r\n[3]\tV. K. Stokes, \u201cCouple stresses in fluids, The Physics of fluids\u201d Vol.9, pp.1709-1715, 1966.\r\n[4]\tP. Sinha, C. Singh, \u201cCouple stresses in the lubrication of rolling contact bearing considering cavitation\u201d Wear, Vol.67, pp. 85-91, 1981.\r\n[5]\tJ. Lin, \u201cEffects of couple stresses on the lubrication of finite journal bearings\u201d Wear, Vol.206, pp. 171-178, 1997.\r\n[6]\tA. A. Elsharkawy, L. H. Guedouar, \u201cAn inverse solution for finite journal bearings lubricated with couple stress fluids\u201d Trib. Int., Vol.34, pp. 107-118, 2001.\r\n[7]\tS. T. N. Swamy, B. S. Prabhu and B. V. A. Roa, \u201cStiffness and damping characteristics of finite width journal bearings with a non-Newtonian film and their application to instability prediction, \u201d Wear, Vol.32, pp. 379-390, 1975.\r\n[8]\tJ. Lin, \u201cLinear stability analysis of rotor-bearing system: couple stress fluid model\u201d Computers and Structures, Vol.79, pp. 801-809, 2001.\r\n[9]\tS. K. Guha, \u201cA theoretical analysis of dynamic characteristics of finite hydrodynamic journal bearings lubricated with coupled stress fluids\u201d Proc. Instn. Mech. Engrs, Vol.218, pp. 125-133, 2004.\r\n[10]\tW. A. Crosby and B. Chetti, \u201cThe static and dynamic characteristics of two-lobe journal bearings lubricated with a couple stress fluid, \u201dTribology Trans., Vol.59, pp. 262-268, 2009.\r\n[11]\tG. S. Nada, G. T. Abdel-Jaber and H. S. Abdo, \u201cThermal effects on hydrodynamic journal bearings lubricated by magnetic fluids with couple stresses\u201d Int. J. Mech. Mechtrn. Eng, Vol.19, pp. 12-20, 2012.\r\n[12]\tS. C. Jain, R. Sinhasan and D. V. Singh, \u201cThe Performance characteristics of thin compliant shell journal bearings\u201d Wear, Vol.81, pp. 251-261, 1982.\r\n[13]\tS. C. Jain and Sinhasan, \u201cPerformance of flexible shell journal bearings with variable viscosity lubricants\u201d Trib. Int., Vol.16, pp. 331-339, 1983.\r\n[14]\tY. Zhang, \u201cLinear Deformation of a journal bearings and its relationship to hydrodynamic pressure\u201d Wear, Vol.115, pp. 41-52, 1987.\r\n[15]\tH. N. Chandrawat and R. Sinhasan, \u201cA Study of steady state and transient performance characteristics of a flexible shell journal bearing\u201d Trib. Int., Vol.21, pp. 137-148, 1988.\r\n[16]\tR. Sinhasan and K. C. Goyal, \u201cElastohydrodynamic studies of circular journal bearings with non-Newtonian lubricants,\u201d Trib. Int., Vol.23, pp. 419-428, 1990.\r\n[17]\tU. M. Mokhiamer, W. A. Crosby and H. A. El-Gamal, \u201cA Study of a journal bearing lubricated by fluids with couple stress considering the elasticity of the Liner\u201d Wear, Vol.224, pp. 194-201, 1999.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 117, 2016"}