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Stability of Rigidly Supported Oil Journal Bearings Using non-Newtonian Lubricants: Comparison of Linear and Non-Linear Analysis

Raghunandana, K and Majumdar, B C and Maiti, R N (2000) Stability of Rigidly Supported Oil Journal Bearings Using non-Newtonian Lubricants: Comparison of Linear and Non-Linear Analysis. In: International Tribology Conference, ITC 2000, October 29 - November 2, , Japanese Society of Tribologists..

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Abstract

The problem of oil--whirl instability in journal bearings is a well-recognized one. Rotor when subjected to oil--whirl besides spinning in the normal manner wobbles around in the clearance space of the bearing. The most important feature of oil whirl instability is that, unlike the critical speed resonance, the amplitude of whirl often does not decrease after the onset speed has been passed. On the contrary, it increases with increasing speed. If corrective measures are not taken, the high amplitude vibrations may result in excessive wear, fatigue and seizure. The effect of the non-Newtonian behavior of lubricants, resulting from the addition of polymers, on the performance of hydrodynamic journal bearings is investigated. The sub-synchronous whirl stability on two symmetrical finite journal bearings has been studied using the linearized perturbation method and the non-linear transient analysis technique. A quantitative comparison for journal bearings with different L/D ratios has been provided. It is observed that for highly loaded bearings the mass parameter will be maximum at n=0.5 by the linearized perturbation method

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Stability, Linear Perturbation, Non-linear Transient, Non-Newtonian, Journal Bearings
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 11 Apr 2013 10:28
Last Modified: 11 Apr 2013 10:28
URI: http://eprints.manipal.edu/id/eprint/79651

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