Inverse Design Methodology for the Stability Design of Elliptical Bearings Operating with Non-Newtonian Lubricants

Raghunandana, K (2007) Inverse Design Methodology for the Stability Design of Elliptical Bearings Operating with Non-Newtonian Lubricants. In: Proceedings of the World Congress on Engineering and Computer Science, October 24-26, San Francisco, USA.

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Abstract

The elliptical bearing is the most widely used in turbines, and is probably the easiest noncircular bearing to make. To design the elliptical bearing, a few important characteristics, like load carrying capacity, flow requirement and power loss due to viscous friction are to be predicted correctly. These parameters can be determined if the pressure within the bearing is known. To have a complete knowledge of these, the generalized Reynolds equation containing viscosity, density, film thickness, surface motion and time as parameters is to be solved. The solution procedure utilized here is an inverse one. A data bank is generated for non-dimensional load carrying capacity in terms of Sommerfeld number, friction force and end flow at different eccentricity ratios. Since the data bank obtained is discreet, curve fitting is done to make them continuous. Using the perturbed pressures it has been possible to compute the four components of stiffness and damping coefficients of the bearings. Apart from the stiffness and damping coefficients another dynamic quantity of interest, namely the threshold of oil whirl instability has been calculated.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Elliptical Bearing, Mass Parameter, Non-Newtonian, Stability
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 15 Mar 2013 09:22
Last Modified: 15 Mar 2013 09:22
URI: http://eprints.manipal.edu/id/eprint/79078

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