Analysis of Single-Grooved Slider and Journal Bearing With Partial Slip Surface

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
T. V. V. L. N. Rao
Keyword(s):  
Shear Stress ◽  
Pressure Distribution ◽  
Journal Bearing ◽  
Slip Surface ◽  
Partial Slip ◽  
Maximum Pressure ◽  
Slider Bearing ◽  
Slip Coefficient ◽  
One Dimensional ◽  
Slip Region

In this paper, pressure and shear stress are derived under steady state using one-dimensional analysis of the single-grooved slider bearing and journal bearing with partial slip on the stationary surface. The Reynolds boundary conditions are used in the analysis of journal bearing to predict the extent of the full film region. In the cases of partial slip slider and journal bearing, the pressure distribution is higher compared with the conventional bearing with no slip. In the case of partial slip on both slider and journal bearing surfaces, the single-groove, immediately followed by the partial slip region, results in the increase in pressure distribution. The results also show that in comparison to the conventional bearing with no slip, in the cases of partial slip slider and journal bearing, the shear stress increases before the region of slip/no slip interface, while the shear stress decreases in the region of no slip. In the case of the partial slip region on bearing surfaces, the shear stress distribution is lower in the region immediately after the groove. Significant pressure distribution is obtained due to the influence of partial slip on the slider bearing with uniform film thickness and the concentric journal bearing. The maximum pressure occurs at the end of the region of groove, immediately followed by the region of the partial slip. It is found that the pressure distribution of the slider and journal bearing with partial slip surface are not influenced with the further increase in the nondimensional slip coefficient (A) from 10 to 100.

Analysis of magnetohydrodynamic partial slip laser bump texture slider and journal bearing

2019 ◽  
Vol 233 (12) ◽  
pp. 1921-1938 ◽  
Author(s):  
TVVLN Rao ◽  
Ahmad Majdi Abdul Rani ◽  
Norani Muti Mohamed ◽  
Hamdan Haji Ya ◽  
Mokhtar Awang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Performance Improvement ◽  
Uniform Magnetic Field ◽  
Journal Bearing ◽  
Load Capacity ◽  
Partial Slip ◽  
Slider Bearing ◽  
One Dimensional ◽  
Electrically Conducting ◽  
Electrically Conducting Fluid

A model of magnetohydrodynamic partial slip laser texture bearing (slider and journal) is developed. The influence of laser bump texture and slip laser texture partial configuration on the magnetohydrodynamic performance analysis of bearing is presented. An electrically conducting fluid is confined to bearing surfaces under uniform magnetic field perpendicular to slider bearing and inclined to the line of maximum film thickness to journal bearing. A one-dimensional analysis based on the narrow groove theory is considered to evaluate the nondimensional pressure distribution in bearing. Results of the nondimensional load capacity and coefficient of friction of magnetohydrodynamic partial laser bump texture and partial slip laser texture bearing configurations are analyzed. Partial slip configuration under MHD lubrication without laser bump texture brings in the performance improvement.

Partial Slip Texture Slider and Journal Bearing Lubricated With Newtonian Fluids: A Review

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
A. Senatore ◽  
T. V. V. L. N. Rao
Keyword(s):  
Coefficient Of Friction ◽  
Surface Texture ◽  
Journal Bearing ◽  
Slip Surface ◽  
Load Capacity ◽  
Journal Bearings ◽  
Newtonian Fluids ◽  
Performance Characteristics ◽  
Partial Slip ◽  
Texture Properties

Partial slip texture surfaces have proven to be effective to improve load capacity and reduce coefficient of friction in slider and journal bearings. By controlling the partial slip surface texture properties, bearing with desired performance can be designed. It is of consequent interest to study the lubrication of slider and journal bearing systems taking into consideration design of partial slip texture surfaces. This paper aims at covering several investigation works related to slider and journal bearing lubricated with Newtonian fluids focusing on partial slip texture influence on bearing performance characteristics.

CFD Analysis of Hydrodynamic Pressure Distribution in Non-Newtonian Oil in Journal Bearing Lubrication Gap

2015 ◽  
Vol 220-221 ◽  
pp. 37-42 ◽  
Author(s):  
Adam Czaban
Keyword(s):  
Shear Stress ◽  
Pressure Distribution ◽  
Journal Bearing ◽  
Hydrodynamic Pressure ◽  
Journal Bearings ◽  
Lubricating Oil ◽  
Cfd Analysis ◽  
Relationship Power ◽  
Lift Capacity ◽  
Relative Eccentricity

This paper presents the results of CFD analysis of the hydrodynamic pressure distribution in slide journal bearings lubricated by non-Newtonian oil. It was assumed that the oil shear stress varies from shear rate according to the Ostwald–de Waele relationship (power law lubricant). The comparison was related to bearings differences only in properties of lubricating oil – Newtonian and non-Newtonian properties; other parameters for both in each case were the same. The Tables show relative decrease of the maximum hydrodynamic pressure value and bearing lift capacity according to the bearing lubricated with Newtonian oil, for different values of bearing relative eccentricity.

The Effect of Wavy Groove Liner on Pressure Distribution of Journal Bearing

2013 ◽  
Vol 315 ◽  
pp. 889-893
Author(s):  
Asral Asral ◽  
Jamaluddin Md Sheriff ◽  
Kahar Osman
Keyword(s):  
Pressure Distribution ◽  
Journal Bearing ◽  
Numerical Data ◽  
Fluid Film ◽  
Maximum Pressure ◽  
Cfd Analysis ◽  
Surface Waviness ◽  
Fluid Film Thickness ◽  
Film Lubrication ◽  
Fluid Film Lubrication

The ability of bearing liner to maintain the fluid film lubrication is crucial to its performance. This study is to investigate the pressure distribution for full film lubrication of wavy bearing liner. The results were compared to that from smooth bearing liner. These bearings were used with the palm oil based lubricant. CFD analysis was developed to determine the numerical data. A 60 mm bearing with ratio 0.5 of its diameter to length is simulated. This bearing has 250 µm in clearance and 200 µm in amplitude with semi rectangular circumferential surface waviness liner in shape. Pressure distribution of the bearing was influenced by the increment of the eccentricity ratio and the speed of shaft. The surface waviness liner bearing produces higher in pressure by comparing it with the smooth bearing. The maximum pressure was noted in the vicinity of minimum fluid film thickness where it was distributed at the area around the peak of wave.

Analysis of Two-Layered Film Journal Bearing with Partial Slip Surface

2014 ◽  
Vol 903 ◽  
pp. 215-220 ◽  
Author(s):  
T.V.V.L.N. Rao ◽  
A.M.A. Rani ◽  
T. Nagarajan ◽  
F.M. Hashim
Keyword(s):  
Boundary Conditions ◽  
Coefficient Of Friction ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Slip Surface ◽  
Load Capacity ◽  
Partial Slip ◽  
Navier Slip ◽  
Navier Slip Boundary Conditions ◽  
Modified Reynolds Equation

Based on the approach of two-layered film consisting of different Newtonian viscosities, the present study examines the effects of partial slip bearing configuration on load capacity and friction coefficient for journal bearing. Navier slip boundary conditions are used to analyze partial slip configuration. A modified Reynolds equation for a journal bearing with two-layered film on a partial slip surface is presented. The modified Reynolds equation is derived taking into consideration of magnitude of lubricant layers film thickness, viscosities and the extent of partial slip on the bearing surface. The Reynolds boundary conditions are used in the analysis to predict nondimensional load capacity and coefficient of friction. Partial slip of bearing surfaces has a potential to improve load carrying capacity and reduce coefficient of friction for two-layered film journal bearing.

Stability evaluation of three-layered journal bearing with slip/partial slip

2017 ◽  
Vol 69 (3) ◽  
pp. 334-341 ◽  
Author(s):  
T.V.V.L.N. Rao ◽  
A.M.A. Rani ◽  
M. Awang ◽  
F.M. Hashim
Keyword(s):  
Surface Layer ◽  
Frequency Ratio ◽  
Journal Bearing ◽  
Core Layer ◽  
High Viscosity ◽  
Partial Slip ◽  
Bearing Surface ◽  
Content Type ◽  
Linearized Stability ◽  
Slip Region

Purpose This paper aims to present stability of a three-layered journal bearing considering magnitude of the layers’ thicknesses and viscosities with slip/partial slip on the bearing surface. Design/methodology/approach Modified Reynolds equation based on one-dimensional analysis is derived for a three-layered journal bearing with slip/partial slip. Dynamic coefficients are derived based on infinitesimal perturbation method. Linearized stability analysis is presented taking into account slip/partial slip on bearing surface; thicknesses and viscosities of bearing surface layer; and core layer and journal surface layer. Findings Results of threshold speed and critical whirl frequency ratio coefficients (Cω, CΩ), stiffness (Kij for i = x,y) and damping (Bij for i = x, y) coefficients and threshold speed (ωs) and critical whirl frequency ratio (Ωs) are presented. The bearing surface is analyzed for slip (total surface with slip) and partial slip (partial surface with slip). The slip-on bearing surface reduces stability, while partial slip improves bearing stability. The threshold speed coefficient (Cω) decreases with slip on bearing surface. The threshold speed (ωs) and critical whirl frequency ratio (Ωs) are influenced by the variation of threshold speed coefficient (Cω) and critical whirl frequency ratio coefficient (CΩ), respectively. A three-layered journal bearing with partial slip and thick high viscosity bearing surface layer results in higher threshold speed coefficient and has a potential to improve stability of journal bearing. The analyses indicate that optimal angular extent of partial slip region (θs) enhances the stability of journal bearing. Originality/value The paper presents parametric study of stability coefficients (Cω and CΩ) and evaluation of threshold speed (ωs) and critical whirl frequency ratio (Ωs) of a three-layered journal bearing with slip/partial slip.

Performance of nano-bio-lubricants, ISO VG46 oil and its blend with Jatropha oil in statically loaded hydrodynamic plain journal bearing

2019 ◽  
Vol 234 (3) ◽  
pp. 386-400 ◽  
Author(s):  
Dhananjay C Katpatal ◽  
Atul B Andhare ◽  
Pramod M Padole
Keyword(s):  
Experimental Study ◽  
Pressure Distribution ◽  
Coefficient Of Friction ◽  
Journal Bearing ◽  
Cuo Nanoparticles ◽  
Maximum Pressure ◽  
Jatropha Oil ◽  
Similar Performance ◽  
Frictional Performance ◽  
Hydrodynamic Journal Bearing

In this experimental study, three stable nano-bio-lubricants were prepared by dispersing CuO nanoparticles in three bio-lubricants and later investigations were carried out to determine pressure distribution and frictional performance of ISO VG46 oil, bio-lubricants and nano-bio-lubricants in hydrodynamic journal bearing under different loads and speeds. The experimental results revealed that pressure of oils inside bearing depends on viscosity of oils. Addition of nanoparticles in bio-lubricants did not help to enhance the maximum pressure of oil inside bearing. Frictional performance of ISO VG46 oil and bio-lubricants was according to their viscosity but coefficient of friction of nano-bio-lubricants was higher compared to ISO VG46 oil inspite of having approximately same viscosity compared to ISO VG46 oil. Among all the oils, ISO VG46 oil and bio-lubricant 9010 had similar performance and hence Bio-lubricant 9010 can be used in place of ISO VG46 oil in journal bearing.

One-Dimensional Contact Pressure Distribution of Radial Tires in Motion

1995 ◽  
Vol 23 (2) ◽  
pp. 116-135 ◽  
Author(s):  
H. Shiobara ◽  
T. Akasaka ◽  
S. Kagami ◽  
S. Tsutsumi
Keyword(s):  
Pressure Distribution ◽  
Contact Pressure ◽  
Experimental Studies ◽  
Rolling Resistance ◽  
Leading Edge ◽  
Forward Direction ◽  
Contact Pressure Distribution ◽  
Support Ring ◽  
One Dimensional ◽  
Lowered Pressure

Abstract The contact pressure distribution and the rolling resistance of a running radial tire under load are fundamental properties of the tire construction, important to the steering performance of automobiles, as is well known. Many theoretical and experimental studies have been previously published on these tire properties. However, the relationships between tire performances in service and tire structural properties have not been clarified sufficiently due to analytical and experimental difficulties. In this paper, establishing a spring support ring model made of a composite belt ring and a Voigt type viscoelastic spring system of the sidewall and the tread rubber, we analyze the one-dimensional contact pressure distribution of a running tire at speeds of up to 60 km/h. The predicted distribution of the contact pressure under appropriate values of damping coefficients of rubber is shown to be in good agreement with experimental results. It is confirmed by this study that increasing velocity causes the pressure to rise at the leading edge of the contact patch, accompanied by the lowered pressure at the trailing edge, and further a slight movement of the contact area in the forward direction.

Dynamic Analysis of Tilting-Pad Journal Bearing—Influence of Pad Deformations

1994 ◽  
Vol 116 (3) ◽  
pp. 621-627 ◽  
Author(s):  
H. Desbordes ◽  
M. Fillon ◽  
C. Chan Hew Wai ◽  
J. Frene
Keyword(s):  
Film Thickness ◽  
Pressure Field ◽  
Journal Bearing ◽  
Maximum Pressure ◽  
Tilting Pad ◽  
Minimum Film Thickness ◽  
Dimensional Finite Element ◽  
The One ◽  
Tilting Pad Journal Bearing ◽  
Tilting Pad Journal Bearings

A theoretical nonlinear analysis of tilting-pad journal bearings is presented for small and large unbalance loads under isothermal conditions. The radial displacements of internal pad surface due to pressure field are determined by a two-dimensional finite element method in order to define the actual film thickness. The influence of pad deformations on the journal orbit, on the minimum film thickness and on the maximum pressure is studied. The effects of pad displacements are to decrease the minimum film thickness and to increase the maximum pressure. The orbit amplitude is also increased by 20 percent for the large unbalance load compared to the one obtained for rigid pad.

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