Engagement behavior of lubricated porous annular disks. Part I: Squeeze film phase — surface roughness and elastic deformation effects

Ting, L. L.

doi:10.1016/0043-1648(75)90062-9

Cited by 88 publications

(28 citation statements)

References 9 publications

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“…To the authors' knowledge, the only paper which deals with the surface roughness effects in porous bearings is by Ting [1]. The roughness aspect forming a comparatively small part of his much wider study which deals with the development of an engagement model of wet clutches used in automotive transmission.…”

Section: Introductionmentioning

confidence: 98%

Lubrication of a Porous Bearing With Surface Corrugations

Prakash

Tiwari

1982

Journal of Lubrication Technology

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The paper considers the surface roughness effects in hydrodynamic porous bearings. On the basis of stochastic theory of hydrodynamic lubrication of rough surfaces developed by Christensen, different forms of Reynolds type equations, as applicable to a general porous bearings are derived for various types of surface roughness pattern. To illustrate the functional effects of surf ace roughness on the operating characteristics of a porous bearing, the case of nonrotating circular plates in normal approach is analyzed. It is shown that surface roughness may considerably influence the operating characteristics of porous bearings. The direction of the influence, however, depends upon the type of roughness assumed.

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Section: Introductionmentioning

confidence: 98%

Lubrication of a Porous Bearing With Surface Corrugations

Prakash

Tiwari

1982

Journal of Lubrication Technology

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“…Several methods have been proposed to deal with the effect of surface roughness on the performance characteristics of squeeze film bearings, Christensen and Tonder (1970), Christensen and Tonder (1969a) and Christensen and Tonder (1969b) developed the stochastic theory of Tzeng and Saibel (1967) to study the effect of surface roughness in general. A good number of research papers are abound dealing with the hydrodynamic lubrication of rough surfaces using stochastic approaches of Christensen and Tonder (1970), Christensen and Tonder (1969a) and Christensen and Tonder (1969b) such as the works on the porous annular disks by Ting (1975), the journal bearing by Guha (1993), Chiang et al (2004), the spherical bearing by Gupta and Deheri (1996), Hydrodynamic slider bearing by Naduvinamani et al (2003), the curved annular plates by Bujurke et al (2007), Deheri et al (2011) and Shimpi and Deheri (2012), the circular plates by Patel et al (2009), Shimpi and Deheri (2010). All the above studies make it clear that roughness affects the performance significantly.…”

Section: Introductionmentioning

confidence: 99%

Combined Effect of Slip Velocity and Roughness on the Jenkins Model Based Ferrofluid Lubrication of a Curved Rough Annular Squeeze Film

Patel

Deheri

2016

JAFM

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This paper theoretically analyzes the combined effect of slip velocity and surface roughness on the performance of Jenkins model based ferrofluid squeeze film in curved annular plates. The effect of slip velocity has been studied resorting to the slip model of Beavers and Joseph. The stochastically averaging method of Christensen and Tonders has been deployed for studying the effect of surface roughness. The pressure distribution is derived by solving the associated stochastically averaged Reynolds type equation with suitable boundary conditions, leading to the computation of load carrying capacity. The graphical representations reveal that the transverse surface roughness adversely affects the bearing performance. However, Jenkins model based ferrofluid lubrication offers some scopes in minimizing this adverse effect when the slip parameter is kept at minimum. Of course, an appropriate choice of curvature parameters adds to this positive effect in the case of negatively skewed roughness. Moreover, it is established that this type of bearing system supports certain amount of load; even when there is no flow which does not happen in the case of conventional lubricant based bearing system.

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“…This method was more versatile than the earlier stochastic theories, because it could be applied readily to any three-dimensional surface roughness structure. Several investigators have employed Christensen & Tonder's approach for analyzing the effects of surface roughness (Ting, 1975;Prakash & Tiwari, 1983;Prajapati, 1991;Guha, 1993;Andharia, Gupta, & Deheri, 1997, 1999Naduvinamani & Siddangouda, 2007b). Deheri, Andharia, and Patel (2005) studied a transverse rough slider bearing with a squeeze film formed by a magnetic fluid.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slip Velocity on Magnetic Fluid Lubrication of Rough Porous Rayleigh Step Bearing

Shukla¹,

Deheri²

2013

J MECH ENG SCI

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This article aims to analyze the performance of a magnetic-fluid-based porous rough step bearing considering slip velocity. The Neuringer-Rosensweig model governs the fluid flow while the velocity slip is modeled by the method of Beavers and Joseph. The bearing surfaces are assumed transversely rough and the transverse surface roughness of the bearing surfaces is characterized by a stochastic random variable with non-zero mean, variance, and skewness. With the usual assumptions of hydrodynamic lubrication, the related stochastically averaged Reynolds' equation for the fluid pressure is solved with appropriate boundary conditions, which is then used to calculate the loadcarrying capacity. It is found that although the bearing suffers owing to transverse surface roughness, the performance of the bearing system can be improved to some extent by the positive effect of magnetization, considering the slip parameter at the minimum; at least in the case of negatively skewed roughness. A comparison of this paper with some established investigations indicates that here, the reduction of loadcarrying capacity due to porosity and slip velocity is comparatively less, especially, when negative variance occurs. In augmenting the performance of the bearing system, the step ratio plays a central role, even if the slip parameter is at the minimum.

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Engagement behavior of lubricated porous annular disks. Part I: Squeeze film phase — surface roughness and elastic deformation effects

Cited by 88 publications

References 9 publications

Lubrication of a Porous Bearing With Surface Corrugations

Lubrication of a Porous Bearing With Surface Corrugations

Combined Effect of Slip Velocity and Roughness on the Jenkins Model Based Ferrofluid Lubrication of a Curved Rough Annular Squeeze Film

Effect of Slip Velocity on Magnetic Fluid Lubrication of Rough Porous Rayleigh Step Bearing

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