The performance and stability of three-lobe journal bearing textured with micro protrusions

El-said, Amr; El-Souhily, Bassuny M.; Crosby, W.A.; Elgamal, Hassan

doi:10.1016/j.aej.2017.08.003

Cited by 20 publications

(19 citation statements)

References 5 publications

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“…The simulated results of circular/two-lobe smooth/textured journal bearing are represented as a function of eccentricity ratio and texture depth as shown in Figures 6 to 16. In the present study, the value of specific density is taken as 50% 18 and the value of offset (δ¯) factor is taken as 0.4. 43 The non-dimensional value of dimple radius (r¯p) is decided as 0.16 and dimple depth value varied from 0.01 to 0.16 as its value cannot exceed the non-dimensional value of dimple radius.…”

Section: Resultsmentioning

confidence: 99%

“…EL-Said et al. 18 studied the steady-state performance and dynamic stability of three-lobe hydrodynamic bearings provided with a bushing surface textured with uniform micro protrusions. The authors concluded that the presence of textured micro protrusions in the bushing of bearings improved the bearing performance.…”

Section: Introductionmentioning

confidence: 99%

“…17 The surface texturing can improve the tribological performance of tribo-contacts like load-carrying capacity, pressure generation, reduction in friction coefficient and increment the life of turbomachinery. EL-Said et al 18 studied the steady-state performance and dynamic stability of three-lobe hydrodynamic bearings provided with a bushing surface textured with uniform micro protrusions. The authors concluded that the presence of textured micro protrusions in the bushing of bearings improved the bearing performance.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical investigation of surface texture effects on the performance characteristics of hydrodynamic two-lobe journal bearing

Singh

Awasthi

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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In the present work, theoretical investigation has been performed to predict the influence of spherical textures on the performance characteristics of two-lobe journal bearing system. The flow of lubricant in the clearance space between the bearing and the journal is governed by the Reynolds equation assuming the flow is Newtonian and isoviscous. The Reynolds equation is solved using a finite element method and the static performance parameters of circular/two-lobe smooth/textured journal bearing system have been computed with variation in eccentricity ratio, dimple depth and its location. The numerically simulated results reveal that the partial surface texturing can provide better performance when the textures are created in the pressure build-up region of 126°–286° and the dimple aspect ratio is nearly 1.0.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theoretical investigation of surface texture effects on the performance characteristics of hydrodynamic two-lobe journal bearing

Singh

Awasthi

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Said et al [15] studied dynamic stability along with the performance characteristic in lobe bearing having textured surface. Their studies reveal that the bearing performance characteristics is ed to a higher extent, reduction in loss of power due to friction and improved load bearing capacity with the use of polymer thickened oils [16]. Reduction in friction and wear between the sliding surfaces is achieved d with appropriate additives [17].…”

Section: Figure 3: Two Axial Grooved Bearing [5]mentioning

confidence: 99%

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

Murthy

Raghunandana

2019

IJMPERD

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In recent years, applications of non-Newtonian fluids as lubricants have received great interest since the use of these non-Newtonian lubricants showed an increase in load carrying capacity and reduction in frictional force with the escalation in additives concentration. The demands of the present day industry rotating machinery includes high speed, compactness, light weight engines, high operating loads, high power transmission, high efficiency, and high performance of the engine. As a result of high speed machines, bearings are inclined to have excessive power loss and increasein oil temperature. The former reduces the efficiency of the engine and the latter causes the undesired changes in the lubricating oil. The plain journal bearings at high rotation speeds are subjected to instability like oil whirl and whip ruining the bearing and also the machine. Therefore, this poses a need to change in the bearing design. In the present paper, an attempt is made to briefly introduce the various non-linear models used and the different approaches that have been carried out by the researches in the past few years to improve and achieve the stability of journal bearing along with enhanced performances and characteristics.

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“…A multivariate optimization model with finite element modelling was presented. Recently, EL-Said et al [5] implemented a finite difference method based on a perturbation scheme for analysing micro-protruded textured three lobe journal bearing to study static and dynamic characteristics. It was observed that micro-patterned three lobe bearing exhibits superior steady-state performance than other bearings studied.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of three lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation

Dhande

Pande

Lanjewar

2018

J Braz. Soc. Mech. Sci. Eng.

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This work is continuation of the earlier work published on an analysis of plain cylindrical journal bearing using CFD-FSI technique. Here, the technique is applied to analyse three lobe journal bearing. The numerical simulations were carried out using ANSYS WorkbenchÒ software. The hydrodynamic pressures were computed using computational fluid dynamics (CFD), and structural deformations were estimated using structural module. The fluid pressure forces and displacements were transferred via inbuilt transfer interface available in the software. The optimization of the journal bearing position was carried out based on response surface optimization. The numerical results were compared with experimental results which were available in the literature, and a good agreement was found. The proposed numerical method was implemented to study the pressure distribution in three lobe journal bearing considered for study at three eccentricity ratios 0.25, 0.6 and 0.75 for various speeds ranging from 1000 to 4000 RPM in order to study effect of eccentricity ratio and speed on static pressure distribution in the bearing. Preload factor of 0.5 was considered for the study. The results were compared with a set of experimental data obtained on a test rig developed by the authors. The uncertainty analysis of the experimental results was also carried out, and all the results were found in expected range of pressure.

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The performance and stability of three-lobe journal bearing textured with micro protrusions

Cited by 20 publications

References 5 publications

Theoretical investigation of surface texture effects on the performance characteristics of hydrodynamic two-lobe journal bearing

Theoretical investigation of surface texture effects on the performance characteristics of hydrodynamic two-lobe journal bearing

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

Numerical analysis of three lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation

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