The Effect of Rectangular Grooves on the Lubrication Mechanism in an Inclined Slider Bearing

M.Mrah, Muhannad; S.Hamid, Ammar

doi:10.30684/etj.2022.136148.1299

	The Effect of Rectangular Grooves on the Lubrication Mechanism in an Inclined Slider Bearing
Engineering and Technology Journal
Article 20, Volume 41, Issue 1, January 2023, Pages 218-231 PDF (1.81 M)
Document Type: Research Paper
DOI: 10.30684/etj.2022.136148.1299
Authors
Muhannad M.Mrah^* ¹; Ammar S.Hamid²
¹University of Technology-Iraq
²Mechanical Engineering Department, University of Technology, Baghdad-Iraq
Abstract
This research aims to study the effect of rectangular grooves on the lubrication mechanism in an inclined slider bearing. Reynolds' equation was used in the theory part to calculate the pressure gradient in a one-dimensional fluid film. The tilted sliding bearing compared the practical results, where the researcher manufactured and developed the device by adding pressure sensors along with the pad. These sensors will give accurate readings because they will read the pressure directly from the bottom of the pads without manometer tubes. Four pads were manufactured, one without grooves and three with rectangular grooves, varying slot widths (3, 5, 8mm), and a depth of 2mm. This study examined various variables: sliding velocities, pad inclination values, and oil temperatures. The conclusions indicated that the flat model is significantly superior to the groove’s models. One significant finding for grooved models is that as the inclination increases, the maximum load capacity approaches the pad's center, allowing grooved models to be used in applications requiring less load and weight. The maximum load-carrying capacity of flat and grooved models was in the film ratio (K) = 2–2.5. In contrast, the load capacity of the flat model was greater than that of the groove model by percentages of 0.5%, 4.27%, and 14.66%, respectively. Moreover, the flat model's coefficient of friction is lower than the coefficient of friction of the groove models, with percentages of 0.38%, 4.63%, and 17.37%, respectively.
Highlights
The pressure distribution increased at 3mm groove width compared to 5mm and 8mm. The grooved models are lower than 0.5, 4.2, and 14.6% of the load capacity of the flat model. The flat model coefficient of friction is lower than the grooved models by 0.3,4.6, and 17.3%. The maximum load-carrying of flat and grooved models was in the film ratio (K) = 2–2.5.
Keywords
Tribology; Inclined Bearing; load-carrying capacity; thrust bearing; and surface grooves

References
[1] G.W. Stachowiak, How tribology has been helping us to advance and to survive, Friction, 5 (2017) 233–247. doi.org/10.1007/s40544-017-0173-7 [2] A. Arslan et al., Surface Texture Manufacturing Techniques and Tribological Effect of Surface Texturing on Cutting Tool Performance: A Review, Crit. Rev. Solid State Mater. Sci., 41 (2016) 447–481. doi: 10.1080/10408436.2016.1186597 [3] I. Etsion, State of the art in laser surface texturing, J. Tribol., 127 (2005) 248–253. doi: 10.1115/1.1828070 [4] A. Erdemir, Review of engineered tribological interfaces for improved boundary lubrication, Tribol. Int., 38 (2005) 249–256. doi: 10.1016/j.triboint.2004.08.008 [5] T. Shimizu, T. Kakegawa, and M. Yang, Micro-texturing of DLC thin film coatings and its tribological performance under dry sliding friction for microforming operation, Procedia Eng., 81 (2014) 1884–1889.doi: 10.1016/j.proeng.2014.10.251 [6] B. Bhushan, Adhesion and stiction: Mechanisms, measurement techniques, and methods for reduction, J. Vac. Sci. Technol. B Microelectron. Nanom. Struct., 21 (2003) 2262. doi: 10.1116/1.1627336 [7] H. Yu, X. Wang, and F. Zhou, Geometric shape effects of surface texture on the generation of hydrodynamic pressure between conformal contacting surfaces, Tribol. Lett., 37 (2010) 123–130.doi: 10.1007/s11249-009-9497-4 [8] I. Etsion, Improving tribological performance of mechanical components by laser surface texturing, Tribol. Lett., 17 (2004) 733–737. doi: 10.1007/s11249-004-8081-1 [9] K. Yagi, H. Sato, and J. Sugimura, On the magnitude of load-carrying capacity of textured surfaces in hydrodynamic lubrication, Tribol. Online, 10 (2015) 232–245.doi: 10.2474/trol.10.232 [10] Y. Wang, Y. Liu, Z. Wang, and Y. Wang, Surface roughness characteristics effects on fluid load capability of tilt pad thrust bearings with water lubrication, Friction, 5 (2017) 392–401.doi: 10.1007/s40544-017-0153-y [11] D. Gropper, T. J. Harvey, and L. Wang, Numerical analysis and optimization of surface textures for a tilting pad thrust bearing, Tribol. Int., 124 (2018) 134–144. doi: 10.1016/j.triboint.2018.03.034 [12] Zhang, Xiaohan ,An Analysis of Surface Roughness and its Influence on a Thrust Bearing, J. Phys. Ther. Sci., 9 (2018) 1–11. [Online]. doi.org/10.1016/j.humov.2018.08.006 [13] K. Maharshi, T. Mukhopadhyay, B. Roy, L. Roy, and S. Dey, Stochastic dynamic behaviour of hydrodynamic journal bearings including the effect of surface roughness, Int. J. Mech. Sci.,142–143 (2018) 370–383.doi: 10.1016/j.ijmecsci.2018.04.012 [14] T. Dimond, A. Younan, and P. Allaire, A review of tilting pad bearing theory, Int. J. Rotating Mach., vol. 2011 (2011). doi: 10.1155/2011/908469 [15] Kingsbury Inc., A general guide to the principles, operation and troubleshooting of hydrodynamic bearings, 2019. [16] C. Gibert et al., Damping coefficient estimation of a squeeze-film damper operating in a dual shaft test rig To cite this version : HAL Id : hal-02456147 Damping coefficient estimation of a squeeze-film damper operating in a dual shaft test rig, 11 (2010) 297 – 308. doi.org/10.1051/meca/2010067 [17] Z. Liming, L. Yongyao, W. Zhengwei, L. Xin, and X. Yexiang, A review on the large tilting pad thrust bearings in the hydropower units, Renew. Sustain. Energy Rev., 69 (2017) 1182–1198. doi: 10.1016/j.rser.2016.09.14 [18] Gwidon Stachowiak ,Andrew Batchelor, Engineering Tribology 4th Edition. ISBN: 9780128100318. Butterworth Heinemann. September 2013. [19] J. Halling, Principles of Tribology , Published by the Macmillan Press Limited, London and Basingstoke, 1978, P. 233, 235, 239, 242. [20] George H.F., Qureshi F. Newton’s Law of Viscosity, Newtonian and Non-Newtonian Fluids. In: Wang Q.J., Chung YW. (eds) Encyclopedia of Tribology. Springer, Boston, MA,2013. doi:org/10.1007/978-0-387-92897-5_143 [21] Muhannad M. Mrah Studying The Tribological Characteristics Of Synthetic Oils Using Manufactured Inclined Bearing. Thesis, University of Technology, Iraq, 2022. [22] D. Gropper, L. Wang, and T. J. Harvey, Hydrodynamic lubrication of textured surfaces: A review of modeling techniques and key findings, Tribol. Int., 94 (2019) 509–529. doi: 10.1016/j.triboint.2015.10.009 [23] Yasir Akram Abd Al - Rida, Study the Influence of the Triangular Slots on the Lubrication Characteristics in the Inclined Slider Bearing, Master thesis, University of Technology, Department of Mechanical Engineering, 2011. [24] E-radionica.com, Pressure Sensor MPS20N0040D-S_datasheet, pp. 13, [Online]. Available: https://datasheet4u.com/datasheet-pdf/ETC/MPS20N0040D-S/pdf.php?id=996460.
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