Stability characteristics of journal bearing systems lubricated with couple stress fluids using the non linear transient approach

K.G, Binu and Shenoy, Satish B and Rao, Srikanth D and Pai, Raghuvir B (2010) Stability characteristics of journal bearing systems lubricated with couple stress fluids using the non linear transient approach. Journal of Tribology and Surface Engineering, 3 (1&2). pp. 51-66. ISSN 1949-4866

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Abstract

A theoretical study of the whirl instability of a rigid rotor supported on a journal bearing lubricated with couple stress fluids is presented. The Reynolds equation is modified and used to obtain the whirl orbits of the journal centre within the clearance circle using a non linear transient approach. The whirl orbits are obtained for various eccentricity ratios and additive characteristic lengths. The critical mass parameters and threshold speeds are evaluated to obtain the threshold stability maps. The stability maps offer useful insights into the dynamic characteristics of journal bearing systems operating on couple stress fluids and form a useful tool in the design of journal bearing systems. The results reveal that stability improves for journal bearings operating with couple stress fluids as compared to Newtonian fluids. The results of the study are compared with those obtained by linear perturbation method and they indicate a significant difference in the variation of critical whirl ratios.

Item Type: Article
Uncontrolled Keywords: Couple stress fluids, critical whirl ratio, journal bearing, whirl instability, non linear transient analysis
Subjects: Engineering > MIT Manipal > Aeronautical and Automobile
Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 28 Aug 2014 07:49
Last Modified: 28 Aug 2014 07:49
URI: http://eprints.manipal.edu/id/eprint/140487

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