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Research Papers: Hydrodynamic Lubrication

Influence of Hydrodynamic Journal Bearings With Multiple Slip Zones on Rotordynamic Behavior

[+] Author and Article Information
A. Bhattacharya

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

J. K. Dutt

Professor Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
New Delhi 110016, India
e-mail: jkdutt@mech.iitd.ac.in

R. K. Pandey

Professor
Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
New Delhi 110016, India
e-mail: rajpandey@mech.iitd.ac.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 18, 2016; final manuscript received April 3, 2017; published online July 10, 2017. Assoc. Editor: Mihai Arghir.

J. Tribol 139(6), 061701 (Jul 10, 2017) (11 pages) Paper No: TRIB-16-1226; doi: 10.1115/1.4036629 History: Received July 18, 2016; Revised April 03, 2017

This paper mainly reports stability investigations of rotors supported on fluid film journal bearings possessing multilocational slip-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) has 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 (SLS) of the system and its robustness for both short (nearly inflexible) and long (flexible) rotors. Numerical simulations show that the pattern of pressure distribution with multiple slip-no-slip zones is similar to that obtained for multilobe bearings, resulting in substantial improvement of rotor–bearing stability irrespective of eccentricity ratio. A reduction in friction force (up to Sommerfeld number 1.8) and an increase in SLS and robustness compared to conventional bearings are observed when used with short rotors. Typically, up to six pairs of slip-no-slip zones improve SLS of the rotor–shaft system and robustness for short rotors, although more pairs deteriorate both. 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.

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References

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Figures

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Fig. 1

Different pairs of slip-no-slip zones on journal bearing surface: (a) three pairs, (b) four pairs, (c) five pairs, (d) six pairs, (e) seven pairs, and (f) eight pairs

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Fig. 2

Schematic of the journal bearing with coordinate systems

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Fig. 3

Comparison of pressure profile at midplane between proposed journal bearing with no-slip (a) and bearing with four pairs of slip-no-slip zones with slip length b = 15 μm (b) (for load = 530 N at speed = 2000 rpm)

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Fig. 4

Comparison of temperature distribution at bearing midplane between proposed journal bearing with no-slip (a) and bearing with three pairs of slip-no-slip zones with slip length b = 100 μm (b) (for load = 530 N at speed = 4000 rpm)

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Fig. 5

Effect of slip length (b) on dimensionless stiffness (kij) and damping coefficients (cij) of a journal bearing with four pairs of slip-no-slip zones

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Fig. 6

Increase in slip length (b) influences slip velocity lesser as slip length increases

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Fig. 7

Schematic view of a journal with a point mass mounted on a journal bearing

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Fig. 8

Real part of eigenvalues of rotor–bearing system (rotor is assumed to be a point mass) for journal bearings with different number of slip-no-slip zone pairs

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Fig. 9

Real part of eigenvalues of rotor–bearing system (rotor is assumed to be long and flexible) for journal bearings with four slip-no-slip zone pairs

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Fig. 10

Transition of real part of eigenvalues from long to short rotors; this shows that as the length of the shaft is reduced, real part of eigenvalue of a rotor-bearing system converges with point mass approximated results: (a) plain cylindrical journal bearing and (b) journal bearing with three pairs of slip-no-slip zones

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Fig. 11

Friction force (for load = 530 N) for different slip lengths (b) at bearing with four pairs of slip and no-slip zones

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