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research-article

Influence of hydrodynamic journal bearings with multiple slip zones on rotordynamic behavior

[+] Author and Article Information
Anupam Bhattacharya

Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi-110016
anupamcounting@gmail.com

Jayanta kumar Dutt

Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi-110016
jkdutt@mech.iitd.ac.in

R. K. Pandey

Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi-110016
rajpandey@mech.iitd.ac.in

1Corresponding author.

ASME doi:10.1115/1.4036629 History: Received July 18, 2016; Revised April 03, 2017

Abstract

This paper mainly reports stability investigations of rotors supported on fluid film journal bearings possessing multi-locational slip and no-slip zones at the bush-film interface. The coupled solution of governing equations (Reynolds equation, energy equation, heat diffusion equation, lubricant rheological relation and thermal boundary conditions) have been used to find pressure distributions in the lubricating film followed by evaluation of bearing coefficients. These coefficients have been used to determine stability limit speed and robustness of stability for both short (inflexible) and long (flexible) rotors. Numerical simulations show that the pattern of pressure distribution with multiple slip and no slip zones are similar to multilobe bearings; resulting substantial improvement of rotor-bearing stability irrespective of eccentricity ratio. A reduction in friction force (up to Sommerfeld number 1.8), increment in stability limit speed and robustness compared to conventional bearings when used with short rotors. Typically, up to 6 pairs of slip-no-slip zones improve stability limit speed of the rotor-shaft system, and robustness although more pairs deteriorate both these. However, for long rotors, where dynamic rotor forces also act, these bearings provide marginal improvement in stability and robustness only for a small range of slip length.

Copyright (c) 2017 by ASME
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