Research Papers: Hydrodynamic Lubrication

Experimental Validation of the Simulated Steady-State Behavior of Porous Journal Bearings1

[+] Author and Article Information
Ioana Adina Neacşu

AC2T research GmbH,
Wiener Neustadt 2700, Austria
e-mail: neacsu@ac2t.at

Bernhard Scheichl

Institute of Fluid Mechanics and Heat Transfer,
Vienna University of Technology,
Vienna 1060, Austria;
AC2T research GmbH,
Wiener Neustadt 2700, Austria

Georg Vorlaufer, Stefan J. Eder

AC2T research GmbH,
Wiener Neustadt 2700, Austria

Friedrich Franek

AC2T research GmbH,
Wiener Neustadt 2700, Austria;
Institute for Sensor and Actuator Systems,
Vienna University of Technology,
Vienna 1040, Austria

Lutz Ramonat

ebm-papst St. Georgen GmbH & Co.KG,
St. Georgen 78112, Germany

2Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 24, 2015; final manuscript received January 7, 2016; published online April 27, 2016. Assoc. Editor: Joichi Sugimura.

J. Tribol 138(3), 031703 (Apr 27, 2016) (11 pages) Paper No: TRIB-15-1314; doi: 10.1115/1.4032659 History: Received August 24, 2015; Revised January 07, 2016

This study deals with a comparison between new experiments on the frictional behavior of porous journal bearings and its prediction by previous numerical simulations. The tests were carried out on bearings lubricated with polyalphaolefin (PAO)-based oils of distinct viscosities. The theoretical model underlying the simulations includes the effects of cavitation by vaporization and accounts for the sinter flow by virtue of Darcy's law. The effective eccentricity ratio corresponding to the experimentally imposed load is estimated by an accurate numerical interpolation scheme. The comparison focuses on the hydrodynamic branches of the Stribeck curve by dimensional analysis (DA), where the variations of the lubricant viscosity with temperature are of main interest. The numerically calculated values of the coefficient of friction are found to reproduce the experimentally obtained ones satisfactorily well in terms of overall trends; yet, the former lie predominantly below the measured ones, which results in a low-positive correlation between the two.

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Fig. 1

Cavitation formation and system parameters

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Fig. 2

Experimental test rig

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Fig. 3

Roughness profile of a sinter bearing in new condition (a) and after 15 hrs operation under a load of 1 N/mm2 (b)

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Fig. 4

Measured temperatures during experiments under a bearing load of 100 N (a) and the equivalent kinematic viscosities using the Ubbelohde–Walther equation for the same configuration (b)

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Fig. 5

Interpolated eccentricity ratios over rotational speed for a constant load of 100 N

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Fig. 6

Stribeck curves for the lubricants PAO 18 (a), PAO 46 (b), PAO 100 (c), and PAO 460 (d)

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Fig. 7

Normalized friction coefficients versus the reciprocal Sommerfeld number for the lubricants PAO 18 (a), PAO 46 (b), PAO 100 (c), and PAO 460 (d)

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Fig. 8

Correlations between measured μexp- and calculated μsim-values for the friction coefficients. Temperature: 25 °C.

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Fig. 9

Friction curve obtained experimentally by Cameron et al. [19] versus numerical calculations for the same configuration

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Fig. 10

Comparison of friction coefficients calculated according to Cameron et al. [19] (continuous lines) and [1] (dashed lines) for Γ = 1



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