Behaviour of externally pressurized conical bearings lubricated with non-Newtonian fluids

El-Kayar, A.; Salem, E.A.; Khalil, M.F.; Bedewi, M.

doi:10.1016/0043-1648(81)90098-3

Cited by 10 publications

(5 citation statements)

References 1 publication

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“…al [2], Shukla and Isa [3], Verma [4], El-Kayar et. al [5], Elsharkawy et. al [6] and Jaw-Ren Lin [7] have studied the flow behavior of various lubricants in an externally pressurized thrust bearing under different conditions.…”

Section: Introductionmentioning

confidence: 97%

Core Variation in an Externally Pressurized Converging Thrust Bearing with Bingham Lubricant

Amalraj

Raymand

2016

AMM

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The effects of angle of convergence on the shape and thickness of the core are analyzed theoretically by considering variable film thickness in an externally pressurized circular thrust bearing. Using the assumptions of the lubrication theory, modified Reynold’s equation and the governing equations are obtained. Using the boundary conditions of the problem in the constitutive equations we get the velocity of the core region as well as flow region. By considering the equilibrium of an element in the yield surface, an algebraic equation to determine the thickness of the yield surface is derived. Numerical solutions are obtained for the thickness of yield surface and velocities for various values of Bingham Numbers and the angle of convergence.

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Section: Introductionmentioning

confidence: 97%

Core Variation in an Externally Pressurized Converging Thrust Bearing with Bingham Lubricant

Amalraj

Raymand

2016

AMM

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“…Usage of externally pressurized thrust bearing lubricated with non-Newtonian lubricants in mechanical industries has many potential advantages. Such advantages are seen in the research works of many pioneering researchers like (El-Kayar et. al., 1981) and (Jaw-Ren Lin, 1999).…”

Section: Introductionmentioning

confidence: 99%

Inertia Effects in Rheodynamic Lubrication of an Externally Pressurized Converging Thrust Bearing using Bingham Fluids

Raymand¹,

Amalraj²

2019

JAFM

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Thrust bearing are innately developed to withstand axial load. When the bearing is subjected to high speed operations, heavy load, high stiffness etc., suggesting a change in the design of the bearing plays a vital role in its performance. Friction is developed between the circular plates while the bearing operates. To reduce this friction, the bearing is lubricated with lubricants such as mineral oil, greases etc., Generally, lubricants are classified into two types that is Newtonian and non-Newtonian. However, non-Newtonian fluids characterized by an yield value such as Bingham, Casson and Herschel Bulkley, are attracting the tribologists, at present. And also, the study of fluid inertia on thrust bearing is required to optimize the performance of the bearings. In this investigation, we have ventured to analyze the performance of the bearing by considering the combined effects of fluid inertia forces and non-Newtonian characteristic with Bingham fluid as lubricant in an externally pressurized converging circular thrust bearing. Such studies will be useful in the design of the bearing for the optimum performance using the appropriate lubricant in various machineries operating in an extreme condition in the industries. Averaging the inertia terms over film thickness and defining a modified pressure gradient, the rheodynamic lubrication equation containing inertia terms has been analyzed. Using the appropriate boundary conditions and considering externally pressurized flow in narrow clearance between two converging discs is symmetric w.r.t r and z axis, the velocity distributions, the modified pressure gradient and thereby the film pressure and the load capacity of the bearing have been obtained numerically for different values of Bingham number, Reynolds number and angle of convergence. In addition to that, the effects of the inertia forces, non-Newtonian characteristics and angle of convergence on the bearing performances have been discussed.

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“…Owing to its exceptional performance attributes, STABs have found application scenarios where robust and predictably advantageous features are imperative in both axial and radial orientations. The noteworthy characteristics of STABs, as highlighted above, have served as a catalyst for scholarly endeavors, propelling researchers to contribute significantly to the realm of bearing systems [2][3][4]. Zuo et al conducted an analysis of hydrostatic tapered bearings, incorporating considerations for variable and fixed slot compensation.…”

Section: Introductionmentioning

confidence: 99%

DenseNet Structured Neural Network-based Chaos Prediction for Stepped-chamber Tapered Air Bearing System

Wang,

Kuo,

Oshima

et al. 2024

Preprint

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Stepped-chamber tapered air bearing (STAB) systems are advanced bearing arrangements designed for applications requiring superior stability at high rotational speeds, along with precise control and stiffness. These systems generate multidirectional supporting forces and offer higher stiffness, making them ideal for high-performance mechanical designs. Despite their advantages, STAB systems can exhibit chaotic motion due to factors like nonlinear pressure distributions, gas imbalances, and design flaws. To understand and control non-periodic motions, a comprehensive analysis is essential. Analytical methods, including dynamic trajectories, spectral responses, bifurcation diagrams, Poincaré maps, and Lyapunov indices, are employed. The study reveals that chaotic phenomena are sensitive to eccentricity and bearing number variations. The interplay of these factors is thoroughly examined. To address chaotic behavior, a DenseNet-structured neural network (DSNN) is developed. This computational framework predicts chaos by evaluating the maximum Lyapunov index of the STAB system. Comparative assessments demonstrate the superior predictive efficacy of the DSNN model, making it a robust tool for anticipating and managing chaotic behavior in STAB systems. These findings enhance our understanding of dynamic intricacies in STAB systems and provide practical design guidelines for industrial applications prioritizing precision, rotational speed, and stiffness.

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Behaviour of externally pressurized conical bearings lubricated with non-Newtonian fluids

Cited by 10 publications

References 1 publication

Core Variation in an Externally Pressurized Converging Thrust Bearing with Bingham Lubricant

Core Variation in an Externally Pressurized Converging Thrust Bearing with Bingham Lubricant

Inertia Effects in Rheodynamic Lubrication of an Externally Pressurized Converging Thrust Bearing using Bingham Fluids

DenseNet Structured Neural Network-based Chaos Prediction for Stepped-chamber Tapered Air Bearing System

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