On the Roughness Effect in Hydrodynamic Lubrication

Chow, Pao–Liu; Saibel, Edward

doi:10.1115/1.3453133

Cited by 16 publications

(4 citation statements)

References 4 publications

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“…The results show that surface roughness may considerably influence bearing characteristics depending upon the structure of roughness patterns. Extended theoretical researches are also carried out by Chow and Saibel (1978) to confirm this stochastic model. By applying this stochastic model, several researches have investigated the influences of rough surfaces upon journal bearing characteristics; such as the steady-state characteristics by Prakash (2000, 2002); and the linear dynamic characteristics by Weng and Chen (2001) and Chiang et al (2004).…”

Section: Introductionmentioning

confidence: 94%

The surface roughness effects of transverse patterns on the Hopf bifurcation behaviors of short journal bearings

Lin¹

2012

Industrial Lubrication and Tribology

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Purpose -On the ground of the Hopf bifurcation theory derived by Hassard et al., the purpose of this paper is to investigate the weakly nonlinear dynamics of transverse rough-surface short journal bearings. Design/methodology/approach -By application of the stochastic model of rough surfaces, developed by Christensen and Tonder, the roughness effects of transverse surface patterns on the bifurcation behaviors close to the Hopf bifurcation point are investigated. Findings -It is found that the dynamic behavior of transverse rough-surface short journal bearings can display Hopf bifurcation phenomena. Comparing with the case of isotropic rough-surface bearing by Lin, under the same parameters, the effects of transverse surface roughness provide a reduced sub-critical Hopf bifurcation region as well as an increased super-critical Hopf bifurcation region. In addition, the effects of transverse surface roughness result in a lower stability-threshold critical speed for both the sub-critical bifurcation profile and the super-critical bifurcation profile. Originality/value -The present study, associated with the results of Hopf bifurcation regions and periodic orbits, can provide useful information for engineers when the transverse surface roughness effects and the bifurcation behavior are considered in a journal bearing system.

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Section: Introductionmentioning

confidence: 94%

The surface roughness effects of transverse patterns on the Hopf bifurcation behaviors of short journal bearings

Lin¹

2012

Industrial Lubrication and Tribology

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“…A more general form of Reynolds equation for the lubrication of bearings with rough surfaces has been derived by Berthe and Godet [11]. The validity of an average Reynolds equation was discussed by Chow and Saibel [12]. The generalized form of Reynolds equations have been derived by Christensen [13] and Elrod [14].…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Porous Structures on the Performance of a Slider Bearing with Surface Roughness in Couple Stress Fluid Film Lubrication

Rao

Agarwal

2015

AMM

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This paper presents the theoretical study and analyzes the comparison of porous structures on the performance of a couple stress fluid based on rough slider bearing. The globular sphere model of Kozeny-Carman and Irmay’s capillary fissures model have been subjected to investigations. A more general form of surface roughness is mathematically modeled by a stochastic random variable with non-zero mean, variance and skewness. The stochastically averaged Reynolds type equation has been solved under suitable boundary conditions to obtain the pressure distribution in turn which gives the expression for the load carrying capacity, frictional force and coefficient of friction. The results are illustrated by graphical representations which show that the introduction of combined porous structure with couple stress fluid results in an enhanced load carrying capacity more in the case of Kozeny-Carman model as compared to Irmay’s model.

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“…Influence of surface corrugation on the performance of slider bearings has attracted the attention of many investigators [1,2,3,4,5,6,7,8,9]. However, in these works, invariably corrugation extends over the full length (in the direction of sliding motion) of the bearing gap.…”

Section: Introductionmentioning

confidence: 99%

Influence of location, number and shape of corrugations in slider bearings

Huynh

Loe²

2004

ANZIAMJ

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The effects of location and shape of a localised corrugation on the performance of a fixed inclined slider bearing are investigated numerically, using a finite element method. It is shown that normal force increases uniformly as the corrugation is relocated downstream in the bearing gap, from being less than that of the smooth walled case to being higher, while flow rate decreases, also uniformly. Corrugation with the shape of rectangle waves produce largest changes in pressure distribution, normal force and flow rate, relative to the smooth walled case. This is followed by sine-wave corrugation, whereas triangle-wave corrugation produces smallest changes. The number of corrugation waves produces similar, but weaker, changes in normal force and flow rate, to the corrugation volume, when this is used as a parameter characterizing corrugation shape.

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On the Roughness Effect in Hydrodynamic Lubrication

Cited by 16 publications

References 4 publications

The surface roughness effects of transverse patterns on the Hopf bifurcation behaviors of short journal bearings

The surface roughness effects of transverse patterns on the Hopf bifurcation behaviors of short journal bearings

A Comparison of Porous Structures on the Performance of a Slider Bearing with Surface Roughness in Couple Stress Fluid Film Lubrication

Influence of location, number and shape of corrugations in slider bearings

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