0
Research Papers: Hydrodynamic Lubrication

Numerical and Experimental Analyses of the Dynamic Characteristics of Journal Bearings With Square Dimples

[+] Author and Article Information
Hiroyuki Yamada

Department of Energy and Environment Science,
Graduate School of Nagaoka
University of Technology,
Kamitomioka machi 1603-1,
Nagaoka-shi 940-2188, Niigata, Japan
e-mail: s125012@stn.nagaokaut.ac.jp

Hiroo Taura

Department of Mechanical Engineering,
Nagaoka University of Technology,
Kamitomioka-machi 1603-1,
Nagaoka-shi 940-2188, Niigata, Japan
e-mail: htaura@vos.nagaokaut.ac.jp

Satoru Kaneko

Department of Mechanical Engineering,
Nagaoka University of Technology,
Kamitomioka-machi 1603-1,
Nagaoka-shi 940-2188, Niigata, Japan
e-mail: kaneko@mech.nagaokaut.ac.jp

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 16, 2017; final manuscript received May 20, 2017; published online August 16, 2017. Assoc. Editor: Stephen Boedo.

J. Tribol 140(1), 011703 (Aug 16, 2017) (13 pages) Paper No: TRIB-17-1016; doi: 10.1115/1.4037151 History: Received January 16, 2017; Revised May 20, 2017

Numerous previous numerical studies have investigated the effect of surface texturing upon the static characteristics of journal bearings, including their load-carrying capacity and friction torque. In general, the dynamic characteristics of journal bearings are also important, since they are essential factors in predicting the vibration behavior of actual rotors supported by journal bearings. However, the effects of surface texture upon these dynamic characteristics have not been investigated through either numerical or experimental analysis. Thus, in the present study, such analyses were conducted to investigate the dynamic characteristics of textured journal bearings, such as their dynamic coefficients of oil film and the stability-threshold shaft speed supported by the bearings. Numerical analysis was done using a model that included inertial effects and energy loss; this model agreed well with experimental results concerning static characteristics from our previous study. Dynamic testing based on a sinusoidal-excitation method was also performed using textured journal bearings with uniform square dimples to verify the numerical results, which agreed qualitatively with those of experiment, confirming the validity of the numerical analysis. These results suggest that under the same operating conditions, the main effect of texturing upon the dynamic coefficients is to yield the cross-coupled stiffness coefficients with lower absolute values than the conventional ones with a smooth surface. The linear stability-threshold shaft speed of the rotor supported by the textured journal bearings became higher than that of a smooth bearing, mainly due to the reduction of cross-coupled stiffness coefficients. This tendency became more pronounced for high Reynolds number operating conditions and textured bearings with a large number of dimples.

Copyright © 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Etsion, I. , and Halperin, G. , 2002, “ A Laser Surface Textured Hydrostatic Mechanical Seal,” Tribol. Trans., 45(3), pp. 430–434. [CrossRef]
Ryk, G. , Kligerman, Y. , and Etsion, I. , 2002, “ Experimental Investigation of Laser Surface Texturing for Reciprocating Automotive Components,” Tribol. Trans., 45(4), pp. 444–449. [CrossRef]
Etsion, I. , Halperin, G. , Brizmer, V. , and Kligerman, Y. , 2004, “ Experimental Investigation of Laser Surface Textured Parallel Thrust Bearings,” Tribol. Lett., 17(2), pp. 295–300. [CrossRef]
Kligerman, Y. , and Etsion, I. , 2001, “ Analysis of the Hydrodynamic Effects in a Surface Textured Circumferential Gas Seal,” Tribol. Trans., 44(3), pp. 472–478. [CrossRef]
Raeymaekers, B. , Etsion, I. , and Talke, F. E. , 2007, “ A Model for Magnetic Tape/Guide Friction Reduction by Laser Surface Texturing,” Tribol. Lett., 28(1), pp. 9–17. [CrossRef]
Murthy, A. N. , Etsion, I. , and Talke, F. E. , 2007, “ Analysis of Surface Textured Air Bearing Sliders With Rarefaction Effects,” Tribol. Lett., 28(3), pp. 251–261. [CrossRef]
Nakano, M. , Korenaga, A. , Korenaga, A. , Miyake, K. , Murakami, T. , Ando, Y. , Usami, H. , and Sasaki, S. , 2007, “ Applying Micro-Texture to Cast Iron Surfaces to Reduce the Friction Coefficient Under Lubricated Conditions,” Tribol. Lett., 28(2), pp. 131–137. [CrossRef]
Kovalchenkoa, A. , Ajayi, O. , Erdemir, A. , Fenske, G. , and Etsion, I. , 2005, “ The Effect of Laser Surface Texturing on Transitions in Lubrication Regimes During Unidirectional Sliding Contact,” Tribol. Int., 38(3), pp. 219–225. [CrossRef]
Podgornik, B. , and Sedlacek, M. , 2012, “ Performance, Characterization and Design of Textured Surfaces,” ASME J. Tribol., 134(4), p. 041701. [CrossRef]
Kuroiwa, Y. , Amanov, A. , Tsuboi, R. , Sasaki, S. , and Kato, S. , 2013, “ Effectiveness of Surface Texturing for Improving the Anti-Seizure Property of Copper Alloy,” Procedia Eng., 68, pp. 600–606. [CrossRef]
Ausas, R. , Ragot, P. , Leiva, J. , Jai, M. , Bayada, G. , and Buscaglia, G. C. , 2007, “ The Impact of the Cavitation Model in the Analysis of Microtextured Lubricated Journal Bearings,” ASME J. Tribol., 129(4), pp. 868–875. [CrossRef]
Cupillard, S. , Cervantes, M. , and Glavatskih, S. , 2008, “ A CFD Study of a Finite Textured Journal Bearing,” IAHR 24th Symposium on Hydraulic Machinery and Systems, Foz Do Iguasu, Brazil, Oct. 27–31, pp. 1–11. https://www.diva-portal.org/smash/get/diva2:1000576/FULLTEXT01.pdf
Tala-Ighil, N. , Maspeyrot, P. , Fillon, M. , and Bounif, A. , 2007, “ Hydrodynamic Effects of Texture Geometries on Journal Bearing Surfaces,” International Conference on Tribology, Bucharest, Romania, Nov. 8–10, pp. 47–52. https://www.researchgate.net/publication/258516340_Hydrodynamic_effects_of_texture_geometries_on_journal_bearing_surfaces
Tala-Ighil, N. , Fillon, M. , and Maspeyrot, P. , 2011, “ Effect of Textured Area on the Performances of a Hydrodynamic Journal Bearing,” Tribol. Int., 44(3), pp. 211–219. [CrossRef]
Brizmer, V. , and Kligerman, Y. , 2012, “ A Laser Surface Textured Journal Bearing,” ASME J. Tribol., 134(3), p. 031702. [CrossRef]
Kango, S. , Singh, D. , and Sharma, R. K. , 2012, “ Numerical Investigation on the Influence of Surface Texture on the Performance of Hydrodynamic Journal Bearing,” Meccanica, 47(2), pp. 469–482. [CrossRef]
Kango, S. , Sharma, R. K. , and Pendey, R. K. , 2014, “ Comparative Analysis of Textured and Grooved Hydrodynamic Journal Bearing,” Proc. Inst. Mech. Eng., Part J, 228(1), pp. 82–95. [CrossRef]
Mishra, S. , Choudhury, A. , and Sahu, S. , 2014, “ CFD Investigation of Influence of Reverse Textures on Bearing Surface of a Journal Bearings,” J. Appl. Fluid Mech., 7(3), pp. 395–399. http://jafmonline.net/JournalArchive/download?file_ID=34644&issue_ID=218
Tala-Ighil, N. , and Fillon, M. , 2015, “ A Numerical Investigation of Both Thermal and Texturing Surface Effects on the Journal Bearings Static Characteristics,” Tribol. Int., 90, pp. 228–239. [CrossRef]
Meng, F. M. , Zhang, L. , Liu, Y. , and Li, T. T. , 2015, “ Effect of Compound Dimple on Tribological Performances of Journal Bearing,” Tribol. Int., 91, pp. 99–110. [CrossRef]
Yamada, H. , Taura, H. , and Kaneko, S. , 2017, “ Static Characteristics of Journal Bearings With Square Dimples,” ASME J. Tribol., 139(5), p. 051703. [CrossRef]
Frene, J. , Nicolas, D. , Degueurce, B. , Berthe, D. , and Godet, M. , 1997, Hydrodynamic Lubrication: Bearings and Thrust Bearings, Elsevier, Amsterdam, The Netherlands, pp. 138–238.
Dadouche, A. , Conlon, M. J. , Dmochowski, W. , Koszela, W. , Galda, L. , and Pawlus, P. , 2011, “ Effect of Surface Texturing on the Steady-State Properties and Dynamic Coefficients of a Plain Journal Bearing: Experimental Study,” ASME Paper No. GT2011-46804.
Dadouche, A. , and Conlon, M. J. , 2013, “ Reflections on Journal Bearings Performance With Surface Texturing,” Fifth World Tribology Congress (WTC), Torino, Italy, Sept. 8–13, pp. 208–213. http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=2dda476e-b48a-4490-8e8c-456791a87e7f
Arghir, M. , Alsayed, A. , and Nicolas, D. , 2002, “ The Finite Volume Solution of the Reynolds Equation of Lubrication With Film Discontinuities,” Int. J. Mech. Sci., 44(10), pp. 2119–2132. [CrossRef]
Someya, T. , Mitsui, J. , Esaki, J. , Satio, S. , Kanemitsu, Y. , Iwatsubo, T. , Tanaka, M. , Hisa, S. , Fujikawa, T. , and Kanki, H. , 1988, Journal-Bearing Databook, Springer-Verlag, Berlin.
Gasch, R. , and Pfützner, H. , 1975, Rotordynamik Eine Einführung, Springer, Berlin. [CrossRef]
Dimond, T. W. , Sheth, P. N. , Allaire, P. E. , and He, M. , 2009, “ Identification Methods and Test Results for Tilting Pad and Fixed Geometry Journal Bearing Dynamic Coefficients—A Review,” Shock Vib., 16(1), pp. 13–43. [CrossRef]
Flack, R. D. , Kostrzewsky, G. J. , and Taylor, D. V. , 1993, “ A Hydrodynamic Journal Bearing Test Rig With Dynamic Measurement Capabilities,” Tribol. Trans., 36(4), pp. 497–512. [CrossRef]
ANSI/ASME, 1986, “ Measurement Uncertainty—Part 1 [of] Instruments and Apparatus,” American National Standards Institute/American Society of Mechanical Engineers, Washington, DC/New York, Standard No. PTC 19.1-1985. http://engineerradcc.library.link/portal/Measurement-uncertainty--part-1-of-Instruments/5JN3m6G0v9A/

Figures

Grahic Jump Location
Fig. 1

Analytical model of the journal bearing under dynamic state with a coordinate system

Grahic Jump Location
Fig. 2

Schematic of a model rotor

Grahic Jump Location
Fig. 3

Schematic of the experimental apparatus: ① test journal bearing, ② shaft, ③ rolling bearings, ④ electric motor, and ⑤ flexible coupling

Grahic Jump Location
Fig. 4

Test bearing and loading equipment (cross-sectional view)

Grahic Jump Location
Fig. 5

Schematic of the square dimples [21]

Grahic Jump Location
Fig. 6

An overview of the images of the textured surfaces [21]: (a) TX1 (dimple width: 0.65 mm) and (b) TX2 (dimple width: 2.50 mm)

Grahic Jump Location
Fig. 7

Relationship of stiffness coefficients to Sommerfeld number for TX1 and PLN at Re = 8: (a) direct terms and (b) cross-coupled terms

Grahic Jump Location
Fig. 8

Relationship of damping coefficients to Sommerfeld number for TX1 and PLN at Re = 8: (a) direct terms and (b) cross-coupled terms

Grahic Jump Location
Fig. 9

Tangential oil-film reaction force component under steady-state versus eccentricity ratio for TX1 and PLN at Re = 8

Grahic Jump Location
Fig. 10

Relationship of linear stability-threshold shaft speed νc to Sommerfeld number S for TX1 and PLN at Re = 8

Grahic Jump Location
Fig. 11

Relationship of stiffness coefficients to Sommerfeld number for PLN and TX1 for different Re values: (a) direct terms and (b) cross-coupled terms

Grahic Jump Location
Fig. 12

Relationship of damping coefficients to Sommerfeld number for PLN and TX1 for different Re values: (a) direct terms and (b) cross-coupled terms

Grahic Jump Location
Fig. 13

Relationship of linear stability-threshold shaft speed to Sommerfeld number for PLN and TX1 for different Re values

Grahic Jump Location
Fig. 14

Relationship of stiffness coefficients to Sommerfeld number for PLN, TX1, and TX2 at Re = 8: (a) direct terms and (b) cross-coupled terms

Grahic Jump Location
Fig. 15

Relationship of damping coefficients to Sommerfeld number for PLN, TX1, and TX2 at Re = 8: (a) direct terms and (b) cross-coupled terms

Grahic Jump Location
Fig. 16

Relationship of linear stability-threshold shaft speed to Sommerfeld number for PLN, TX1, and TX2 at Re = 8

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In