Similar articles

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.

[1] Chen, B.X., Qiu, Z.G., Zhang, H.S., 1991. The Theory of Liquid Lubrication and its Application. Mechanical Industry Press, Beijing, p.193 (in Chinese).

[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.