A Study of the Oil-Lubricated Herringbone-Grooved Journal Bearing—Part 1: Numerical Analysis

Kang, Kyung-Phil; Rhim, Yoon Chul; Sung, Kiro

doi:10.1115/1.2831627

Cited by 44 publications

(21 citation statements)

References 4 publications

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“…Although this meshing technique requires an adaptation of the grid size with respect to the geometry of the texturing pattern, the methodology has been employed in other studies 34 and it proves to be very efficient. To demonstrate this, a specific comparison is performed with the one-dimensional analytical study of a pocketed, parallel bearing by Fowell et al 10 Although the algorithm presented in the current investigation is two-dimensional, the comparison with one-dimensional results was made possible by applying the so-called ''symmetry boundary conditions'' in the z direction (meaning that fluid pressure can only vary in the flow direction) and by reducing the bearing breadth B to a value of 1 mm.…”

Section: Discretization Technique and Model Validationmentioning

confidence: 99%

Effects of surface texturing in steady-state and transient flow conditions: Two-dimensional numerical simulation using a mass-conserving cavitation model

Gherca

Fatu

Hajjam

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents a numerical investigation on the influence of surface texturing on the hydrodynamic performance of a two-dimensional parallel slider bearing operating in both steady-state and transient lubrication. The tribological behavior of the bearing is evaluated by means of a mass-conserving cavitation model based on a finite element discretization of a modified version of the unstationary Reynolds equation. While considering the impact of the operating parameters, the influence of various geometrical features such as the texture ratio, the texture density, or the dimple depth is determined by means of an extended parametric study. Furthermore, particular attention is given to the lubrication mechanisms describing the potential effects produced by texturing the moving pad of the bearing. Thus, it is shown that a textured moving surface can contribute to the generation of hydrodynamic lift on the basis of a squeeze effect being produced at the leading edge of the textured region. Finally, the study reveals how texturing the stationary pad and/or the moving pad of the bearing affects hydrodynamic performance. The analyses show that, for an applied load, texturing the moving pad of the bearing instead of the stationary one leads to a decrease in film thickness, while texturing both pads produces optimum bearing performance.

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Section: Discretization Technique and Model Validationmentioning

confidence: 99%

Effects of surface texturing in steady-state and transient flow conditions: Two-dimensional numerical simulation using a mass-conserving cavitation model

Gherca

Fatu

Hajjam

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Most of these studies have involved the application of a finite difference method for discretization. For example, Kang et al [5] used staggered nodes to avoid a violent change in film thickness, while Jang and Chang [6] investigated HGJBs by combining the finite volume method with Elrod's cavitation algorithm. The latter mentioned the incompatibility of Cartesian coordinates with grooves.…”

mentioning

confidence: 99%

Spectral element analysis of herringbone‐grooved journal bearings with groove–ridge discontinuity

Chen¹,

Yen²,

Chang³

2011

Numerical Methods in Fluids

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Many researchers have investigated the performance of herringbone-grooved journal bearings (HGJBs). However, few have yet mentioned the issue of film thickness discontinuities in HGJBs with a finite number of grooves. Most studies have involved the application of a finite difference method for discretization. The present work utilizes the spectral element method to calculate the pressure distribution and dynamic coefficients of HGJBs, in which the thickness of the fluid film changes abruptly in the groove-ridge region. Conservation of mass is adopted to solve the problem. Additionally, the present method can be adopted for grooves with curvy geometry. The numerical results were compared with the analytical solution for a one-dimensional slider bearing and an HGJB. It also shows that for the case of HGJB, the numerical result by the present method is more accurate than the numerical results found in the literature (Trans. ASME 12: 518-540). Furthermore, employing the present method with the Elrod algorithm can improve the accuracy of deriving loads of HGJBs when cavitation occurs.In addition, the result displays the efficiency of the present method by observing the CPU time. Therefore, the approach can be employed to compute the critical mass of a HGJB. The influence of changing groove angle, groove depth, groove width, and the eccentricity on the critical mass are discussed. Observing the variations in critical mass shows that when the eccentricity is small, a larger groove angle, a lower groove depth, and smaller groove width correspond to a higher critical mass of the HGJB. SPECTRAL ELEMENT ANALYSIS OF HGJBS 1117Many researchers have investigated the performance of HGJBs. In previous studies, the pressure distribution of the fluid film in the groove-ridge region was obtained by applying the narrow groove theory (NGT). NGT assumes that the number of grooves is infinite, such that the pressure distribution can be regarded as essentially linear along the grooves. Vohr and Chow [1] analyzed the herringbone-grooved gas-lubricated journal bearing using NGT, but manufacturing journals or sleeves with as many grooves as are required would be very expensive. Additionally, NGT overestimated the bearing load when the number of grooves was less than 16 [2], and when the number of grooves exceeds 16, the correct results can only be obtained at a low eccentricity. Hence, numerical methods that can be applied to bearings with a finite number of grooves must be developed.In the 1990s, the number of investigations on bearings with finite numbers of HGJBs increased rapidly. Bonneau and Absi [2] presented a numerical study of gas HGJBs that had a small number of herringbone grooves and analyzed the domain of validity of the NGT. Zirkelback and San Andrés [3] used finite element method to analyze HGJB pressure distribution and dynamic force coefficients. Faria [4] present a way to analyze HGJBs by combining the finite element method with high-order shape functions.Only a few researchers have yet mentioned the issue of film thickne...

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“…On the other hand, the dynamic characteristics of herringbonegrooved journal bearings (HGJBs) and herringbonegrooved face seals have been analyzed and discussed in detail. Kang et al 15 presented a numerical analysis of static and dynamic characteristics of an oil-lubricated HGJB with eight circular-profile grooves on the sleeve by finite difference method. Zirkelback and Andres 16 investigated the load and dynamic coefficients for a HGJB using finite element method.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental analysis for leakage rate and dynamic characteristics of herringbone-grooved liquid seals

Zhai

Wei

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, a theoretical analysis method for leakage rate and dynamic characteristics of herringbone-grooved liquid seals is proposed. Steady-state velocities and leakage rate are figured out first with the inertia term of the fluid combined with mass conservation within the seals. Subsequently, the rotordynamic coefficients are solved based on the investigation of Iwatsubo and Childs. Laboratory tests were performed on a specially designed test rig. Detailed comparisons between the experimental results and theoretical predictions show a good agreement on the leakage rate and hydraulic forces for five model seals, which provide an evidence of validation of the analysis method developed in this paper. Moreover, the influence of rotational speed and pressure difference on the leakage rate and rotordynamic coefficients of herringbone-grooved seals is discussed. The results show that the operating conditions and seal structures greatly influence the sealing and rotordynamic performances, which is helpful for designing herringbone-grooved seals.

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A Study of the Oil-Lubricated Herringbone-Grooved Journal Bearing—Part 1: Numerical Analysis

Cited by 44 publications

References 4 publications

Effects of surface texturing in steady-state and transient flow conditions: Two-dimensional numerical simulation using a mass-conserving cavitation model

Effects of surface texturing in steady-state and transient flow conditions: Two-dimensional numerical simulation using a mass-conserving cavitation model

Spectral element analysis of herringbone‐grooved journal bearings with groove–ridge discontinuity

Theoretical and experimental analysis for leakage rate and dynamic characteristics of herringbone-grooved liquid seals

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