The effects of the total bearing deformation on the performance of hydrodynamic thrust bearings

Karadere, Gültekin

doi:10.1108/00368791011051062

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…Hydrodynamic thrust slider bearings have been theoretically studied plentifully by considering non-Newtonian fluids, surface roughness, fluid film viscous heating and surface elastic deformation [1][2][3][4][5][6][7][8]. Those studies addressed the bearing clearances over 0.1 μm, which is normally far larger than the thickness of the physically adsorbed layer on the bearing surface.…”

Section: Introductionmentioning

confidence: 99%

“…Surface elastic deformation was usually neglected in the previous studies on hydrodynamic thrust slider bearings because of the low film pressures [1][2][3][4][5][6]. There are also some literatures on the surface elastic deformation effect in a hydrodynamic slider bearing without considering the effect of the adsorbed layer [7,8]. In the multiscale hydrodynamic thrust slider bearing as described above, because of the low clearance and the effect of the adsorbed layer, the generated film pressures can be much higher than those in the classical bearing and they may cause the elastic deformations of the bearing surfaces comparable to and even larger than the bearing clearance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Elastic Deformation in Hydrodynamic Inclined Fixed Pad Thrust Bearing with Low Clearance

ZHU,

ZHANG

2023

mech

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The paper analytically studies the effect of surface elastic deformation in hydrodynamic inclined fixed pad thrust slider bearing with low clearances by the multiscale approach considering the physically adsorbed layer on the bearing surface. The numerical calculation results show that the bearing surface elastic deformation has significant influences on both the hydrodynamic pressure and the surface clearance in the bearing especially for a strong fluid-bearing surface interaction. For given load, sliding speed and bearing geometrical sizes, the surface elastic deformation considerably reduces the minimum bearing clearance, which exists on the exit of the bearing. It also significantly reduces the hydrodynamic film stiffness and the load-carrying capacity of the bearing especially for a strong fluid-bearing surface interaction and low bearing clearances. The increasing proportionality of the carried load of the bearing with the sliding speed is also significantly reduced by the surface elastic deformation particularly for a strong fluid-bearing surface interaction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Surface Elastic Deformation in Hydrodynamic Inclined Fixed Pad Thrust Bearing with Low Clearance

ZHU,

ZHANG

2023

mech

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“…The load-carrying capacity was found to decrease considerably with an increase in the Knudsen number. Karadere and Gultekin [32] adopted the constitutive equations of the linear elastic materials to model the pad and runner deformations under stable lubricant viscosity and isothermal conditions and compared the solutions of steel runner–steel pad and the steel runner–bronze pad material pairs. The elastohydrodynamic numerical simulation for conformal contacts of fixed slider plane bearings was made by Yagi and Sugimura [33].…”

Section: Introductionmentioning

confidence: 99%

Combined Effect of Rarefaction and Effective Viscosity on Micro-Elasto-Aerodynamic Lubrication Performance of Gas Microbearings

Liu

2019

Micromachines

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Elastic deformation and gaseous rarefaction effects are of great importance to the static and dynamic characteristics of gas microbearings. Based on the effective viscosity model of Veijola, the governing equations can be solved by the partial derivative method, finite element procedure, and relaxed iterative algorithm. The numerical results showed that the maximum gas pressure is relatively lower compared to a microbearing with a rigid liner at a local pressure peak region, owing to the film thickness of two converging-diverging profiles and the existence of bimodal pressure inside the elastic microbearing liner. However, the effect of bearing flexibility provides a marginal increase in the load capacity on account of the integral area of pressure distribution is larger than the rigid bearing liner. The friction coefficient and direct stiffness coefficients increase as the elastic modulus decreases while the direct damping coefficients become smaller at high eccentricity ratios and bearing numbers. Since the Poiseuille flow rate increases in connection with an increasing Knudsen number, the effective viscosity of the lubricant leads to a decreased load carrying capacity, friction coefficient, and direct stiffness coefficient, which produces an increase in the direct damping coefficients.

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“…Borràs et al (2012) built a multiphysics (TEHD) model of a spring-supported thrust bearings for hydropower applications. Karadere (2010) investigated the effects of the total bearing deformation on the performance of hydrodynamic thrust bearings. A lubrication analysis program has recently been combined with ANSYS in a thermal elastic hydro dynamics model of a thrust bearing with good agreement with measured results (Wu and Wu, 2010;Wu and Zhang, 2011;Huang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations for the fluid-thermal-structural interaction lubrication in a tilting pad thrust bearing

Zhai

Luo

Liu

et al. 2017

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Purpose The purpose of this paper is to analyze lubrication characteristics of a tilting pad thrust bearing considering the effect of the thermal elastic deformation of the pad and collar. Design/methodology/approach This study used the fluid–solid interaction (FSI) technique to investigate the lubrication characteristics of a tilting pad thrust bearing for several typical operating conditions. The influences of the rotational speed, the thrust load and the oil supply temperature on the lubrication characteristics were analyzed. Findings The three-dimensional (3D) film model clearly shows that there is no pressure gradient but large temperature gradients across the film thickness. The wall heat transfer coefficients on the pad surfaces distribute in a very complex way and change within a large range. The rotational speed, the thrust load and the oil supply temperature have great but different influences on the lubrication characteristics. Originality/value This paper has preliminarily revealed the lubrication mechanism of the tilting-pad thrust bearings. The 3D FSI method is suggested to evaluate the thermal-elastic-hydrodynamic deformations of thrust bearings instead of the conventional method which iteratively solves the Reynolds equation, the energy equation, the heat conduction equation and the elastic equilibrium equation. Using FSI method, the heat transfer coefficients on the pad surfaces can be evaluated better.

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The effects of the total bearing deformation on the performance of hydrodynamic thrust bearings

Cited by 7 publications

References 19 publications

Effect of Surface Elastic Deformation in Hydrodynamic Inclined Fixed Pad Thrust Bearing with Low Clearance

Effect of Surface Elastic Deformation in Hydrodynamic Inclined Fixed Pad Thrust Bearing with Low Clearance

Combined Effect of Rarefaction and Effective Viscosity on Micro-Elasto-Aerodynamic Lubrication Performance of Gas Microbearings

Numerical simulations for the fluid-thermal-structural interaction lubrication in a tilting pad thrust bearing

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