Elastic Behavior of the Plain Journal Bearing Coated With a Textured Surface and a Non-Textured Surface

2020 ◽  
Vol 8 (1) ◽  
pp. 55-77
Author(s):  
Mehala Kadda ◽  
Bendaoud Nadia
Keyword(s):  
Journal Bearing ◽  
Surface Effect ◽  
Rotational Velocity ◽  
Surface Texturing ◽  
Pressure Profile ◽  
Operating Conditions ◽  
Elastic Behavior ◽  
Elastic Behaviour ◽  
Shear Stresses ◽  
Textured Surface

Surface texturing technology has been newly explored technique in the tribological domain, and this method is carried out to improve the displacement and performance of the Babbitt plain journal bearing with a textured surface. The numerical analysis is carried out to study the textured surface effect on the elastic behaviour of the journal bearing. First, the bearing is tested without texture; second, it is examined completely textured, by varying the operating parameters of the bearing. The performance is observed in a pressure profile, displacement, and shear stress, generated for each combination of radial loads, and rotational velocity of the shaft. The numerical modelling is used by solving the displacement equations by the finite element method to analyses bearing displacement for severe operating conditions. The results show that the elastic deformations for textured bearing, are important and preponderant for higher rotational speeds, and shear stresses are important for higher hydrodynamic pressures.

scholarly journals Multiphase Computational Fluid Dynamics Analysis of Hydrodynamic Journal Bearing Under the Combined Influence of Texture and Slip

Lubricants ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 97 ◽  
Author(s):  
Mohammad Tauviqirrahman ◽  
J. Jamari ◽  
Bayu Siswo Wibowo ◽  
Hilmy Muhammad Fauzan ◽  
M. Muchammad
Keyword(s):  
Environmental Sustainability ◽  
Journal Bearing ◽  
Fluid Dynamic ◽  
Surface Texturing ◽  
System Component ◽  
Textured Surface ◽  
Computational Fluid Dynamic Analysis ◽  
Slip Boundary ◽  
Computational Fluid Dynamics Analysis ◽  
Hydrodynamic Journal Bearing

The drive to maintain the environmental sustainability and save the global energy consumption is urgent, making every powertrain system component a candidate to enhance efficiency. In this work, the combined effects of the slip boundary and textured surface in hydrodynamic journal bearing as one of the critical components in industrial powertrain and engine systems are assessed using a multiphase computational fluid dynamic analysis that allows for phase change in a cavitation process and arbitrary textured geometry. The texture studied consists of regularly spaced rectangular dimples through two-dimensional (infinitely long) journal bearing. The modified Navier–slip model is employed to describe the slip boundary condition. A systematic comparison is made for various textured configurations varying the texture depth and the length of the texturing zone with respect to the performance of a smooth (untextured) bearing for several eccentricity ratios. The effectiveness of the texture with or without slip at enhancing the load support over a corresponding smooth bearing is investigated with the parameters. The detrimental or beneficial effect of surface texturing as well as the slip promotion is explained in terms of the mechanisms of pressure generation for several eccentricity ratios. The results of the present work indicate that journal bearing textured by a proper texturing zone and dimple depth are characterized by substantial load support levels. However, in the range of high eccentricity ratios, the promotion of texturing and slip can significantly degrade the performance of the load support.

Behaviour of two-lobe hole-entry hybrid journal bearing system under the combined influence of textured surface and micropolar lubricant

2017 ◽  
Vol 69 (6) ◽  
pp. 844-862 ◽  
Author(s):  
Chandra B. Khatri ◽  
Satish C. Sharma
Keyword(s):  
Design Methodology ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Numerical Technique ◽  
Surface Texturing ◽  
Textured Surface ◽  
Performance Parameters ◽  
Content Type ◽  
Fluid Theory ◽  
Bearing System

Purpose The aim of the present paper is to study the combined influence of textured surface and micropolar lubricant behaviour on the performance of two-lobe hole-entry hybrid journal bearing system. The bearing performance parameters of the textured circular/two-lobe hole-entry hybrid journal bearing system have been computed against the constant vertical external load supported by the bearing. Design/methodology/approach In this work, Eringen’s micropolar fluid theory has been used to derive the governing Reynolds equation. The consequent solution of the governing Reynolds equation has been obtained by using finite element method (FEM) numerical technique. Findings The present study indicates that the use of the textured surface, two-lobe profile of bearing and micropolar lubricant, significantly enhances the bearing performance as compared to non-textured circular journal bearing. Originality/value The present study concerning the influence of surface texturing on the behaviour of the two-lobe hole-entry hybrid journal bearing lubricated with micropolar lubricant is original. The theoretically simulated results of the present study will be useful to design an efficient journal bearing system.

Numerical Analysis of the Fluid Flow Behavior in the Plain Journal Bearing at Textured and Not Textured Surface

2021 ◽  
Vol 9 (1) ◽  
pp. 40-59
Author(s):  
Bendaoud Nadia ◽  
Mehala Kadda
Keyword(s):  
Fluid Flow ◽  
Numerical Analysis ◽  
Flow Behavior ◽  
Rotational Velocity ◽  
Operating Conditions ◽  
Hydrodynamic Performance ◽  
Hydrodynamic Characteristics ◽  
Textured Surface ◽  
Plain Bearing ◽  
Rotating Machines

Hydrodynamic plain bearings are components that provide the guiding in rotation of rotating machines, such as turbines, the reactors. This equipment works under very severe operating conditions. In order to improve the hydrodynamic performance of these rotating machines, the industrialists specialized in the manufacture of hydrodynamic bearings have designed a bearing model with its textured interior surface. The numerical analysis is carried out to study the for both plain bearings types with a textured a non-textured surface thus to see the improvement of the plain bearing hydrodynamic performances, as well as the fluid flow behavior in motion. The analysis is performed by solving the continuity equation of Navier-Stokes, by the finite volume method, using CFD code. The numerical results show that the most important hydrodynamic characteristics such as pressure, minimal film thickness, friction torque, leakage flow, are significant for the textured plain bearing under rotational velocity of 6000rpm and radial load 10000N compared to obtained for a non-textured plain bearing.

Effect of Surface Texturing on the Steady-State Properties and Dynamic Coefficients of a Plain Journal Bearing: Experimental Study

2011 ◽  
Author(s):  
Azzedine Dadouche ◽  
Martin J. Conlon ◽  
Waldemar Dmochowski ◽  
Waldemar Koszela ◽  
Lidia Galda ◽  
...  
Keyword(s):  
Steady State ◽  
Journal Bearing ◽  
Surface Texturing ◽  
Spherical Shape ◽  
Journal Bearings ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Dynamic Coefficients ◽  
Internal Surfaces ◽  
Effect Of Surface

The last decade has seen a significant and increased interest in surface texturing technologies esulting in improving the overall tribological properties of mechanical components. Several techniques could be used to modify the surface topography with laser surface texturing becoming most popular recently. In this investigation, rig experiments have been performed on plain and textured-surface journal bearings with an aspect ratio of 1.1 under a variety of loads and speeds. Percussive burnishing (embossing) was used to create the dimples on the internal surfaces of the test bearings. The dimples have a spherical shape with a diameter of 1 mm and a depth of 60 micrometers. Pit-area ratio was in the range 5–20% of the total bearings surfaces. The effects of surface-texturing and dimple density on the bearing steady-state characteristics and dynamic coefficients are analyzed and discussed in this paper.

Optimising lubricated friction coefficient by surface texturing

2013 ◽  
Vol 227 (11) ◽  
pp. 2610-2619 ◽  
Author(s):  
E de la Guerra Ochoa ◽  
J Echávarri Otero ◽  
E Chacón Tanarro ◽  
P Lafont Morgado ◽  
A Díaz Lantada ◽  
...  
Keyword(s):  
Experimental Data ◽  
Friction Coefficient ◽  
Chemical Etching ◽  
Surface Texturing ◽  
Point Contact ◽  
High Load ◽  
Operating Conditions ◽  
Textured Surface ◽  
Lubrication Regimes ◽  
Texture Size

Surface texturing has proved to be a very useful tool for expanding the behaviour under hydrodynamic and elastohydrodynamic regimes instead of mixed or boundary lubrication regimes, and therefore for reducing the friction coefficient under high-load low-speed conditions. This article presents the texturing of different copper test-samples using photolithography and chemical etching to measure the friction coefficient using a point contact machine. The effects of texture size, texturing density, the initial roughness of the samples and the operating conditions have all been studied. Some combinations of texturing density and texture size achieve up to 30% reduction in the friction coefficient. Taking into account experimental data, artificial neural networks are used as a tool for both predicting and optimising the friction coefficient on the textured surface for any given operating condition.

Numerical optimization of surface texture for improved tribological performance of journal bearing at varying operating conditions

2018 ◽  
Vol 70 (9) ◽  
pp. 1608-1618 ◽  
Author(s):  
Ali Usman ◽  
Cheol Woo Park
Keyword(s):  
Journal Bearing ◽  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Tribological Performance ◽  
Operating Conditions ◽  
Content Type ◽  
Load Carrying ◽  
Recent Developments ◽  
Effect Of Surface ◽  
Generalized Reynolds Equation

Purpose Journal bearings are used in numerous rotary machines. The load carrying capacity and friction of a bearing have been major concerns in design. Recent developments in surface texturing have showed potential outcomes to improve the tribological characteristics of mating surfaces. This study aims to investigate surface textures, which are transverse to the sliding direction, for frictional response of the journal bearing. Design/methodology/approach A hydrodynamic lubrication model is considered to evaluate the effect of surface texturing on the performance of a journal bearing at varying operating conditions. The two-dimensional generalized Reynolds equation, coupled with mass-conserving Elrod cavitation algorithm, is solved to evaluate texture-induced variations in tribological performance parameters. Findings Results have showed remarkable improvements in frictional response. Moreover, micro-textures on the journal surface alter the cavitation response and film-reformation in the hydrodynamic conjunction of the plain bearing. Originality/value Operating condition-based comprehensive exhaustive optimization of texture geometry is performed to generate widespread conclusion.

Effect of surface texturing on the dynamic characteristics of hydrodynamic journal bearing comprising concepts of green tribology

2018 ◽  
Vol 232 (11) ◽  
pp. 1365-1376 ◽  
Author(s):  
Shivank Matele ◽  
KN Pandey
Keyword(s):  
Dynamic Characteristics ◽  
Journal Bearing ◽  
Surface Texturing ◽  
Stability Margin ◽  
Journal Bearings ◽  
Textured Surface ◽  
Viable Option ◽  
Hydrodynamic Journal Bearing ◽  
Green Tribology ◽  
Effect Of Surface

Surface texturing has emerged as a viable option for enhancing the surface properties. The present study analyzes the effect of full and partial micro-textured surface, at different locations and different kinds of dimple geometries, on the dynamic characteristics of hydrodynamic journal bearings and made a comparative study with the non-textured bearings. Three different kinds of dimple geometries, namely, circular texture, square texture, and densely distributed square texture have been adopted for study. The important dynamic characteristics of bearings were evaluated and stability charts were plotted. Location of the texture was found as an important parameter for improved dynamic characteristics though the extent of improvement depends largely on the geometry of texture. The partial textured bearing with proper geometry and location was found to be more stable. Stability margin of such bearings was more in comparison to the plain journal bearings and the relative improvement was found to be the maximum for circular texture and minimum for square texture. The study also shows the potential of surface texturing to make contribution in the accomplishment of the objectives of green tribology.

Numerical analyses of turbulent flow behavior in plain journal bearing

2016 ◽  
Vol 68 (1) ◽  
pp. 76-85 ◽  
Author(s):  
Nadia Bendaoud ◽  
Mehala Kadda ◽  
Abdelkader Youcefi
Keyword(s):  
Turbulent Flow ◽  
Flow Regime ◽  
Journal Bearing ◽  
Flow Behavior ◽  
Extreme Case ◽  
Operating Conditions ◽  
Elastic Behavior ◽  
Turbulent Regime ◽  
Content Type ◽  
Elastic Effect

Purpose – This paper aims to investigate the fluid flow regime and the elastic effect in a plain cylindrical journal bearing subjected to highly severe operating velocity to better predict the behavior of the bearing for the turbulent flow regime. Design/methodology/approach – A numerical analysis of the behavior of an elastohydrodynamic for cylindrical journal bearing finite dimension coated with antifriction material in turbulent regime, is implemented using the code-ANSYS CFX. This analysis is performed by solving the Navier–Stocks equations of continuity by the method of finite volume for rotational speeds ranging from 6,000 to 15,000 rpm, that is to say for different Reynolds number. Findings – This study aims to better predict the elastic behavior in a journal bearing subjected to severe operating conditions. The speed of rotation varies from 6,000 to 15,000 rpm. Originality/value – The results clearly show that significant pressures are applied in the extreme case of speed, that is to say to the turbulent regime. There is an emergence of new rupture zone pressure, we do not usually see the regime established; the level of the supply groove. Displacement of shaft relative to the bearing is remarkable by introducing the elastic effect and the turbulent regime.

scholarly journals Does laser surface texturing really have a negative impact on the fatigue lifetime of mechanical components?

Friction ◽  
2021 ◽  
Author(s):  
Chia-Jui Hsu ◽  
Andreas Stratmann ◽  
Simon Medina ◽  
Georg Jacobs ◽  
Frank Mücklich ◽  
...  
Keyword(s):  
Boundary Lubrication ◽  
Surface Texturing ◽  
Contact Stresses ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Wear Loss ◽  
Textured Surface ◽  
Periodic Patterns ◽  
Rolling Bearings ◽  
Fatigue Lifetime

AbstractLaser surface texturing (LST) has been proven to improve the tribological performance of machine elements. The micro-scale patterns manufactured by LST may act as lubricant reservoirs, thus supplying oil when encountering insufficient lubrication. However, not many studies have investigated the use of LST in the boundary lubrication regime, likely due to concerns of higher contact stresses that can occur with the increasing surface roughness. This study aims to examine the influence of LST on the fatigue lifetime of thrust rolling bearings under boundary lubrication. A series of periodic patterns were produced on the thrust rolling bearings, using two geometrically different designs, namely cross and dimple patterns. Base oil ISO VG 100 mixed with 0.05 wt% P of zinc dialkyldithiophosphate (ZDDP) was supplied. The bearings with cross patterns reduce the wear loss by two orders of magnitude. The patterns not only retain lubricant in the textured pockets but also enhance the formation of an anti-wear tribofilm. The tribofilm generation may be improved by the higher contact stresses that occur when using the textured surface. Therefore, in contrast to the negative concerns, the ball bearings with cross patterns were instead found to increase the fatigue life by a factor of three.

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