Performance of worn non-recessed hole-entry hybrid journal bearings

This paper concerns with theoretical investigation to predict the influence of cylindrical textures on the static and dynamic performance characteristics of hydrodynamic journal bearing system and the performance is compared with smooth surface bearing. The Reynolds equation governing the fluid–film between the journal and the bearing surface is solved numerically with the assistance of finite element method and the performance characteristics are evaluated as a function of eccentricity ratio, dimple depth and its location. In this study, four journal bearing configurations viz: smooth (non-textured), full-textured, partially textured-I, and partially textured-II are considered for the evaluation of theoretical results. The simulated results indicate that the influence of surface textures is more significant when the textures were created in upstream zone of 126°–286° and dimple aspect ratio nearly 1.0.

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“…Fluid–film stiffness coefficients: The dimensionless fluid–film stiffness coefficients are expressed as 26–28 where i = direction of force…”

Section: Introductionmentioning

confidence: 99%

Influence of dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

Singh

Awasthi²

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Dufrane, et al (14) stated that the worn footprint created by the shaft is symmetrical at the bottom of the bearing and the wear pattern is uniform along the axial length of the bearing. The change in the bearing geometry is expressed as (Awasthi,et al (18), (19)): The values of angles α b and α e are calculated by equating Eq. [4] with Eq.…”

Section: Fluid Film Thicknessmentioning

confidence: 99%

“…The rotor dynamic coefficients (S 11 , S 22 ,C 11 , C 22 ) were computed using the local pressure derivatives and a detailed explanation of the computation process used in the present study was provided by Sharma, et al (46). For computation of threshold speed (ω th ), the expression given by Awasthi, et al (19) was used in the present study. The characteristic equation for the linearized equation of motion is a quadratic polynomial equation of the following form:…”

Section: Performance Characteristicsmentioning

confidence: 99%

“…Several researchers (Vaidyanathan and Keith (15); Hashimoto,et al (16); Kumar and Mishra (17)) have used Dufrane, et al (14) wear model to study the influence of wear on the performance of hydrodynamic journal bearings. Later, Awasthi, et al (18), (19) used Dufrane's model to numerically study the influence of wear on the performance of nonrecessed hybrid journal bearings using an FEM. Bouyer,et al (20) conducted an experimental study and reported that Dufrane's wear model is a good approximation of the actual wear in practical operating conditions.…”

Section: Introductionmentioning

confidence: 99%

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Performance Characteristics of Micropolar Lubricated Membrane-Compensated Worn Hybrid Journal Bearings

Nicodemus¹,

Sharma²

2012

Tribology Transactions

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The objective of the present article is to analytically study the effect of wear on the performance of a membrane-compensated hybrid journal bearing system under micropolar lubrication. The lubricating oil containing additives and contaminants has been modeled as a micropolar fluid. The wear on the bearing surface due to the transient (start-stop) operations has been modeled using Dufrane's abrasive wear model. The modified Reynolds equation governing the flow of micropolar lubricant in the clearance space of a bearing has been solved using an iterative scheme based on the finite element method (FEM) and the Newton-Raphson method. The numerically simulated results are presented for a wide range of restrictor design parameters, wear depth parameter, and micropolar parameters. The numerically simulated results suggest that the wear on the bearing surface and micropolar parameters of the lubricant significantly affect the bearing performance. Therefore, it is imperative to take into account the effect of wear and lubricant characteristics in the bearing analysis in order to generate accurate design data for bearing performance.

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“…The cylindrical non-recessed hybrid journal bearings are used extensively in various engineering applications owing to their superior dynamic performance characteristics [1][2][3][4]. However, the critical requirements pertaining to operating conditions necessitates these bearings to be designed more accurately.…”

Section: Introductionmentioning

confidence: 99%

A study of 2-lobe symmetric hole entry hybrid journal bearing operating with non-Newtonian lubricant considering thermal effects

Kushare¹,

Sharma

2015

Tribology International

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Performance of worn non-recessed hole-entry hybrid journal bearings

Cited by 27 publications

References 15 publications

Influence of dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

Influence of dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

Performance Characteristics of Micropolar Lubricated Membrane-Compensated Worn Hybrid Journal Bearings

A study of 2-lobe symmetric hole entry hybrid journal bearing operating with non-Newtonian lubricant considering thermal effects

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