Performance characteristics of two-lobe pressure dam bearings with micropolar lubrication

Sharma, Sanyam; Verma, Ravi

doi:10.1177/1350650118806368

Cited by 7 publications

(10 citation statements)

References 23 publications

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“…Effect of dam parameters and micropolarity on two lobe pressure dam bearing was explained by Sharma and Verma. 19 They concluded that higher micropolarity and dam in upper lobe provides better threshold speed. Therefore, such bearings were found to be highly stable than two lobe bearings.…”

Section: Introductionmentioning

confidence: 99%

Dynamic stability of micropolar lubricated hydrodynamic offset-halves journal bearings

Sharma¹,

Krishna

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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The plain circular journal bearings are not found to be stable by researchers when used in high speed rotating machineries. Hence, extensive research in the study of stability characteristics of non-circular bearings or lobed bearings assumed importance, of late. Present article deals with the stability analysis of non-circular offset bearing by taking selected set of input and output parameters. Modified Reynolds equation for micropolar lubricated rigid journal bearing system is solved using finite element method. Two kinds of input parameters namely, offset factors (0.2, 0.4) and aspect ratios (1.6, 2.0) have been selected for the study. The important output characteristics such as load, critical mass, whirl frequency ratio, and threshold speed are computed and plotted for various set of values of input parameters. The results obtained indicate that micropolar lubricated circular offset bearing is highly stable for higher offset factor and higher aspect ratio.

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Section: Introductionmentioning

confidence: 99%

Dynamic stability of micropolar lubricated hydrodynamic offset-halves journal bearings

Sharma¹,

Krishna

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In the dynamic analysis of micropolar lubricated offset bearing, Sharma and Krishna 37 concluded that higher offset provides better stability in terms of threshold speed. Very recently, the stability of micropolar lubricated elliptical dam bearing was presented by Sharma et al 38 Above studies [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] reflect that micropolar lubrication provides improved static and dynamic performance of circular and non-circular journal bearing configurations, as compared with Newtonian lubrication.…”

Section: Introductionmentioning

confidence: 99%

Micropolar lubricant effects on the performance of partial journal bearings

Sharma

Lambah

Mittal

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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Present work deals with the computation of static performance of partial journal bearing, operated with micropolar lubricant. The non-dimensional Reynolds equation governs the lubricant flow in clearance space and finite element method is used to solve it. Static characteristics including bearing load capacity, attitude angle, friction force, friction factor, and side flow are presented. Input parameters are chosen such as partial angles 120° and 180° and a width-diameter ratio (1.0), for a range of micropolar fluid parameters. The numerically simulated results show that the bearing geometry and lubricant micropolar parameters on higher side, provide an improved static performance of partial journal bearing system.

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“…In continuation of the above research studies, Sharma and Krishna (2015) concluded that an increase of length diameter ratio ( L/D ) ratio reduces stability of two-lobe bearing. Sharma and Verma (2018) suggested that two-lobe bearing with dam should operate at smaller characteristics length l m = 10 for achieving good stability.…”

Section: Introductionmentioning

confidence: 99%

Analysis of elliptical dam bearing lubricated with micropolar fluid

Sharma

Krishna

Singh

2022

ILT

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Purpose This paper aims to evaluate the theoretical performance of elliptical dam bearing (EDB). The objective of this paper is to study the influence of eccentricity ratio, dam parameters and micropolarity parameters on the stability of EDB with respect to micropolar lubrication. Design/methodology/approach In this study, the modified Reynolds’ equation for dynamic state is solved using the finite element method and Galerkin technique. A MATLAB code is written to compute pressure and stability and also to analyse the characteristics. The stability parameters of an EDB are computed for selected values of eccentricity ratios at four levels in the range of 0.20 to 0.35 and for length-diameter ratio of 2.0. Findings The results from stability analysis reveal that micropolar lubricated EDB provides better stability at smaller material length due to increased effective viscosity. Hence, it is better to select the smaller characteristic length and higher dam width to achieve optimum performance of these bearings. Originality/value Very few researchers investigated the effects of working eccentricity, bearing dam and micropolar fluid parameters on the EDB in the past. It is important to study these aspects for optimum performance of bearings.

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Performance characteristics of two-lobe pressure dam bearings with micropolar lubrication

Cited by 7 publications

References 23 publications

Dynamic stability of micropolar lubricated hydrodynamic offset-halves journal bearings

Dynamic stability of micropolar lubricated hydrodynamic offset-halves journal bearings

Micropolar lubricant effects on the performance of partial journal bearings

Analysis of elliptical dam bearing lubricated with micropolar fluid

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