Surface roughness effects in hydrodynamic bearings

Quiñonez, Armando Félix; Morales-Espejel, Guillermo E.

doi:10.1016/j.triboint.2016.02.027

Cited by 22 publications

(11 citation statements)

References 18 publications

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“…The authors showed the surface roughness enhanced the pressure distribution and load carrying capacity while the permeability parameter diluted the load. Quiñonez [ 27 ] utilized the linear superposition of perturbation method and Flourier transformation to provide a solution for the flow characteristics of wide exponential land slider bearings with rough surfaces. The results were in good agreement with the cases of sinusoidal and single Gaussian dent.…”

Section: Introductionmentioning

confidence: 99%

Interactive Effects of Rarefaction and Surface Roughness on Aerodynamic Lubrication of Microbearings

Liu

2019

Micromachines

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The aerodynamic lubrication performance of gas microbearing has a particularly critical impact on the stability of the bearing-rotor system in micromachines. Based on the Duwensee’s slip correction model and the fractal geometry theory, the interactive effects of gas rarefaction and surface roughness on the static and dynamic characteristics were investigated under various operation conditions and structure parameters. The modified Reynolds equation, which governs the gas film pressure distribution in rough bearing, is solved by employing the partial derivative method. The results show that high values of the eccentricity ratio and bearing number tend to increase the principal stiffness coefficients significantly, and the fractal roughness surface considerably affects the ultra-thin film damping characteristics compared to smooth surface bearing.

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Section: Introductionmentioning

confidence: 99%

Interactive Effects of Rarefaction and Surface Roughness on Aerodynamic Lubrication of Microbearings

Liu

2019

Micromachines

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“…The results showed that the micro-dimple textures could reduce the friction between the cylinder core and rings and provide more hydrodynamic support forces. Félix Quiñonez 17 presented an analytical method to calculate the effects of surface roughness of bearing bush in wide exponential land slider hydrodynamic journal bearings. The bearing surface roughness was assumed to be integrated by linear superposition of waviness using Fourier Transforms.…”

Section: Introductionmentioning

confidence: 99%

Influences of journal with 3D form errors on dynamic coefficients of hydrodynamic bearings yielded to JFO boundary conditions

Zhang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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The dynamic characteristics of the journal with form error are analyzed, including normalized stiffness and damping coefficients. A new expression for journal surface with form error is presented, which is capable of formulating any types of form errors on the journal, and the dimensionless Reynolds equation is renewed and solved suffering from the Jakobsson, Floberg, and Olsson boundary conditions. The results show that form errors do have a significant influence on the dynamic performance of journal bearings and that the uncertainty attribute of form error could result in variations of dynamic properties so significantly that the system might operate in an entirely different way. Therefore, it is necessary to take more operating information into account, such as the elaborate state of the journal surface, in order to predict the bearing performance more accurately.

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“…Ahmed et al [1] presented a study of the effect of misalignment on the dynamic characteristics of journal bearings. Félix et al [2] analyzed the effect of surface roughness in hydrodynamic bearings using the finite differences discretization techniques and multigrid methods. Wang et al [3,4] computed the characteristics of journal bearings lubricated with micropolar fluids considering cavitating effects.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spiral Angle on the Performance of Spiral Oil Wedge Sleeve Bearing

Wang

Zeng

Zhang

2018

International Journal of Rotating Machinery

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Spiral angel is an important structure parameter of spiral oil wedge sleeve bearing, which produces greater impact on bearing performance. Based on JFO boundary condition, the generalized Reynolds equations considering four slip conditions are established. Using the concept of partial derivatives, stiffness and damping coefficients of sleeve bearing are calculated. The results show that carrying capacity and friction drag of oil film decrease, temperature rise decreases first and then increases, and end leakage rate, stiffness, and damping coefficients generally increase first and then decrease with the increase of spiral angle. The carrying capacity, friction drag, temperature rise, stiffness, and damping coefficients are smaller and the end leakage rate is higher considering wall slip and JFO condition compared with reckoning with no slip and Reynolds boundary condition.

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Surface roughness effects in hydrodynamic bearings

Cited by 22 publications

References 18 publications

Interactive Effects of Rarefaction and Surface Roughness on Aerodynamic Lubrication of Microbearings

Interactive Effects of Rarefaction and Surface Roughness on Aerodynamic Lubrication of Microbearings

Influences of journal with 3D form errors on dynamic coefficients of hydrodynamic bearings yielded to JFO boundary conditions

Influence of Spiral Angle on the Performance of Spiral Oil Wedge Sleeve Bearing

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