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CLC number: TH113.31

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Received: 2007-11-25

Revision Accepted: 2008-02-27

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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.7 P.916~921

http://doi.org/10.1631/jzus.A0720085


Performance of dynamically loaded journal bearings lubricated with couple stress fluids considering the elasticity of the liner


Author(s):  Yan-yan MA

Affiliation(s):  School of Publishing and Printing, University of Shanghai for Science and Technology, Shanghai 200093, China

Corresponding email(s):   myy_7@163.com

Key Words:  Journal bearings, Couple stress, Elasticity, Lubrication


Yan-yan MA. Performance of dynamically loaded journal bearings lubricated with couple stress fluids considering the elasticity of the liner[J]. Journal of Zhejiang University Science A, 2008, 9(7): 916~921.

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author="Yan-yan MA",
journal="Journal of Zhejiang University Science A",
volume="9",
number="7",
pages="916~921",
year="2008",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A0720085"
}

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%T Performance of dynamically loaded journal bearings lubricated with couple stress fluids considering the elasticity of the liner
%A Yan-yan MA
%J Journal of Zhejiang University SCIENCE A
%V 9
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%@ 1673-565X
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0720085

TY - JOUR
T1 - Performance of dynamically loaded journal bearings lubricated with couple stress fluids considering the elasticity of the liner
A1 - Yan-yan MA
J0 - Journal of Zhejiang University Science A
VL - 9
IS - 7
SP - 916
EP - 921
%@ 1673-565X
Y1 - 2008
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0720085


Abstract: 
To take into account the couple stress effects, a modified Reynolds equation is derived for dynamically loaded journal bearings with the consideration of the elasticity of the liner. The numerical results show that the influence of couple stresses on the bearing characteristics is significant. Compared with Newtonian lubricants, lubricants with couple stresses increase the fluid film pressure, as a result enhance the load-carrying capacity and reduce the friction coefficient. However, since the elasticity of the liner weakens the couple stress effect, elastic liners yield a reduction in the load-carrying capacity and an increase in the friction coefficient. The elastic deformation of the bearing liner should be considered in an accurate performance evaluation of the journal bearing.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[2] Lin, J.R., 1998. Squeeze film characteristics of finite journal bearings: couple stress fluid model. Tribology International, 31(4):201-207.

[3] Lin, J.R., 1999. Static and dynamic characteristics of externally pressurized circular step thrust bearings lubricated with couple stress fluids. Tribology International, 32(4):207-216.

[4] Lin, J.R., Yang, C.B., Lu, R.F., 2001. Effects of couple stresses in the cyclic squeeze films of finite partial journal bearings. Tribology International, 34(2):119-125.

[5] Ma, Y.Y., Wang, W.H., Cheng, X.H., 2004. A study of dynamically loaded journal bearings lubricated with non-Newtonian couple stress fluids. Tribology Letters, 17(1):69-74. [doi:10.1023/B:TRIL.0000017420.44627.63] Mokhiamer, U.M., Crosby, W.A., El-Gamal, H.A., 1999. A study of a journal bearing lubricated by fluids with couple stress considering the elasticity of the liner. Wear, 224(2):194-201.

[6] Naduvinamani, N.B., Hiremath, P.S., Gurubasavaraj, G., 2001. Squeeze film lubrication of a short porous journal bearing with couple stress fluids. Tribology International, 34(11):739-747.

[7] Naduvinamani, N.B., Hiremath, P.S., Gurubasavaraj, G., 2002. Effect of surface roughness on the static characteristics of rotor bearings with couple stress fluids. Computers and Structures, 80(14-15):1243-1253.

[8] Sharma, S.C., Jain, S.C., Sah, P.L., 2000. Effect of non-Newtonian behaviour of lubricant and bearing flexibility on the performance of slot-entry journal bearing. Tribology International, 33(7):507-517.

[9] Wang, X.L., Zhu, K.Q., Wen, S.Z., 2002. On the performance of dynamically loaded journal bearings lubricated with couple stress fluids. Tribology International, 35(3):185-191.

[10] Williamson, B.P., Walters, K., Bates, T.W., Coy, R.C., Milton, A.L., 1997. The viscoelastic properties of multigrade oils and their effect on journal-bearing characteristics. Journal Non-Newtonian Fluid Mechanics, 73(1-2):115-126.

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