Modares Mechanical Engineering

Modares Mechanical Engineering

The effect of shell texturing on the performance of noncircular hydrodynamic two lobe journal bearings

Authors
masoud aliheidari 1
Asghar Dashti Rahmatabadi 2
Mahdi Zare Mehrjardi 3
1 yazd university
2 Associate Professor- Yazd University
3 Member of Faculty of Mechanical Engineering, Ardakan University
Abstract
Use of oil journal bearings in recent decades has grown considerably because of their desirable performance in light and heavy loading condition and also for reducing noise pollution, as a suitable supports in different industrial equipment such as turbomachines, combustion engines and nuclear reactors .Due to the influence of the geometry of these bearings on their performance, a variety of models such as elliptical, lobed, waved, pivoted pad and axial grooves have been introduced to market for purposeful improvement in their steady-state and dynamic operating conditions. In recent decade, with the development of advanced non-traditional machining equipment, the ability to create textures on the bearings shell has been provided by manufacturers. Cubic, cylindrical, spherical and cone shaped textures can have a different effect on the performance of journal bearings. In this study, the performance of two lobe bearings with cylindrical textures is evaluated. For this purpose, the governing Reynolds equation of Newtonian lubrication has been investigated, regarding to the changes in the lubricant film thickness according to the geometry and position of textures, by the FEM using the Reynolds boundary condition for determining the cavitation zone. Then, the bearing performance is evaluated based on the pressure distribution of the lubricant film and the location of the textures. The results show that the location of the textures, to achieve a more favorable performance, is different for various values of noncircularity index. Also, with increasing the bearing noncircularity, the effect of textures formation on the bearing performance will be more noticeable.
Keywords
Cylindrical Texture
Hydrodynamic Journal Bearing
Two Lobe
Steady- State Performance
Finite Element Method (FEM)
[1] N. Tala-Ighli, P. Maspeyrot, M. Fillon, A. Bounif, Effects of suerface texture on journal-bearing characteristics under steady-state operating conditions, Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, Vol. 221, No. 6, pp. 623-633, 2007.
[2] N. Tala-Ighli, M. Fillon, P. Maspeyrot, Effect of suerface textured area on the performance of a hydrodynamic journal bearing, Tribology International, Vol. 44, No. 3, pp. 211-219, 2011.
[3] S. Kango, D. Singh, R. K. Sharma, Numerical investigation on the influence of surface texture on the performance of hydrodynamic journal bearing, Acta Mechanica, Vol. 47, No. 2, pp. 469-482, 2012.
[4] V. Brizmer, Y. Kligerman, A laser surface textured journal bearing, Journal of Tribology, Vol. 134, No. 3, pp. 031702, 2012.
[5] S. Kango, R. K. Sharma, R. K. Pandey, Thermal analysis of micro-textured journal bearing using non-Newtonian rheology of lubricant and JFO boundary conditions, Tribology International, Vol. 69, No. 1, pp. 19-29, 2014.
[6] T. S. Ganji, S. K. Kakoty, R. K. Pandey, Analysis on micro elliptical textured journal bearing, International Journal of Current Engineering and Technology, Vol. 2, No. 2, pp. 648-650, 2014.
[7] T. S. Ganji, S. K. Kakoty, R. K. Pandey, Dynamic characteristic and stability of cylindrical textured journal bearing, International Journal of Recent Advances in Mechanical Engineering, Vol. 3, No. 2, pp. 1-14, 2014.
[8] S. Hamdavi, H. H. Ya, N. Rao, Effect of surface texturing on hydrodynamic performance of journal bearing, ARPN Journal of Engineering and Applied Sciences, Vol. 11, No. 1, pp. 172-176, 2016.
[9] K. Sharma, Investigation on the influence of spherical textures on the performance characteristics of porous journal bearing, International Journal of Applied Engineering and Technology, Vol. 6, No. 3, pp. 97-106, 2016.
[10] A. A. Raimondi, J. Boyd, A solution for the finite journal bearing and its application to analysis and design, ASLE Transactions, Vol. 1, No. 1, pp. 159- 209, 1958.
[11] M. M. Reddi, T. Y. Chu, Finite element solution of steady-state incompressible lubrication problem, ASME Journal of Lubrication Technology, Vol. 92, No. 1, pp. 495-503, 1970.
[12] A. D. Rahmatabadi, M. Z. Mehrjardi, M. R. Fazel, Performance analysis of micropolar lubricated journal bearings using GDQ method, Tribology International, Vol. 43, No. 11, pp. 2000-2009, 2010.
[13] S. Das, S. K. Guha, A. K. Chattopadhyay, Linear stability analysis of hydrodynamic journal bearings under micropolar lubrication, Tribology International, Vol. 38, No. 5, pp. 500-507, 2004.
[14] M. Malik, M. Chandra, R. Sinhasan, Design data for three lobe bearing, ASLE Transactions, Vol. 24, No. 3, pp.171-178, 1981.
[15] M. Malik, M. Chandra, R. Sinhasan, On performance characteristics of threelobe porous hydrodynamic journal bearings,Tribology Transactions, Vol. 24, No. 3, pp. 354 – 361, 1981.
[16] J. Reddy, An Introduction to the Finite Element Method, 3 th Edition, pp. 63- 286, McGraw Hill, India,1984.
[17] B. J. Hamrock, S. R. Schmid, B. O. Jacobson, Fundamentals of Fluid Film Lubrication, 2nd Edition, pp. 108-350, Taylor & Francis, 2004.
[18] A. D. Rahmatabadi, M. Nekoeimehr, R. Rashidi, Micropolar lubricant effects on the performance of noncircular lobed bearings, Tribology International, Vol. 43, No. 1-2, pp. 404-413, 2010.
Modares Mechanical Engineering
Volume 18, Issue 2
April 2018
Pages 293-304