Starvation Effects on the Hydrodynamic Lubrication of Rigid Nonconformal Contacts in Combined Rolling and Normal Motion

Ghosh, M. K.; Hamrock, B. J.; Brewe, D. E.

doi:10.1080/05698198708981735

Cited by 7 publications

(6 citation statements)

References 20 publications

(1 reference statement)

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“…A detailed comparison of the contribution of various terms of the energy equation has been done by Sadeghi et al [21], which also justify omitting of these terms in the present work. In this problem, there are two unknown temperatures (at Lobatto points) T 1 and T À1 , which have to be computed by using energy equation (16). In order to compute T 1 and T À1 , two equations involving T 1 and T À1 are required.…”

Section: Energy Equationmentioning

confidence: 99%

“…In order to compute T 1 and T À1 , two equations involving T 1 and T À1 are required. Therefore, zeroth and first moment of energy equation (16) have been taken across the film thickness as follows Zeroth moment…”

Section: Energy Equationmentioning

confidence: 99%

“…The authors have presented inlet pressure build-up due to variation in the starvation level in the form of isometric and contour plots. Ghosh et al [16] determined the effect of inlet starvation on the HL of lightly loaded rigid nonconformal contacts in combined rolling and normal motion. Authors have found relatively small effect of starvation on the dynamic peak pressure ratio.…”

Section: Introductionmentioning

confidence: 99%

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Effects of starvation and viscous shear heating in hydrodynamically lubricated rolling/sliding line contacts

Anandan

Pandey

Jagga

et al. 2006

Proceedings of the Institution of Mechanical Engineers, Part J:

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Combined effects of viscous shear heating and starvation in hydrodynamically lubricated high-speed rolling/sliding line contacts have been investigated numerically by using an efficient computational method for the solution of energy equation in which temperature distribution across the film is approximated by Legendre polynomial. Effects of starvation on minimum film thickness, traction coefficient, and mid-film temperature rise are computed for lightly loaded, lubricated rolling/sliding line contacts. Lubricant starvation in the contact has been created by gradually reducing the length of the computational domain from the inlet side. The performance parameters in the line contact have been evaluated for high-rolling speeds (15 -45 m/s), light loads (10 Â 10 3 -17 Â 10 3 N/m), and slip values varying up to 10 per cent. Significant reduction in minimum film thickness, traction coefficient, and maximum mid-film temperature rise has been observed with the increase in the severity of starvation. The analysis reveals that the existence of starvation seems to be beneficial in terms of reduced traction and temperature rise provided there is a continuous film at the contact. On the basis of this work, empirical relations are developed for the prediction of non-dimensional minimum film thickness, traction coefficient, and non-dimensional maximum mid-film temperature rise in the contact in terms of various operational parameters viz. thermal loading parameter (Q), non-dimensional load (W ), slip (S ), and starvation parameter (jX s j).

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Section: Energy Equationmentioning

confidence: 99%

Section: Energy Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of starvation and viscous shear heating in hydrodynamically lubricated rolling/sliding line contacts

Anandan

Pandey

Jagga

et al. 2006

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Using a moving contact C1 and a stationary contact C2, the two ball bearings are included in an electrical circuit (13).…”

Section: Tribotest Journalmentioning

confidence: 99%

“…The two ball bearings (3) are rotated by a variable, highspeed driving system (l), are axially loaded by an elastic system (6) and are lubricated by an oil-air mist nozzle (4). Using a moving contact C1 and a stationary contact C2, the two ball bearings are included in an electrical circuit (13).…”

Section: 000 30000mentioning

confidence: 99%

A new methodology to estimate starvation in ball bearings

Olaru

Gafitanu

1997

Tribotest

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In agreement with isothermal EHD theory, increases in speed and lubricant viscosity determine the increase in film thickness. Beyond certain limits, both speed and viscosity lead to a decrease in film thickness, as a result of thermal effects and starvation. To estimate starvation limits and film thickness in high‐speed, mist‐lubricated ball bearings, a new analytical methodology has been developed. This methodology is based both on the oil flow rate in ball‐race contacts and Hamrock and Dowson's starvation theory. This new methodology has been used to estimate minimum film thickness in a 7206C angular contact ball bearing, axially‐loaded, and rotated between 0 and 35,000 r/min−1. Good correlation between computed and experimental values of the minimum film thickness have been obtained.

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Starved lubrication analysis of angular contact ball bearing based on a multi-degree-of-freedom tribo-dynamic model

Wen

Meng

et al. 2023

Friction

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When the oil supply is not adequate to maintain the ideal lubrication, angular contact ball bearing will enter into the starved lubrication regime resulting in the potential performance degradation and consequently the severe failures. To study the effects of starved lubrication on the performance of angular contact ball bearing, this paper first proposes a multi-degree-of-freedom (DOF) tribo-dynamic model by introducing five-DOF inner ring, six-DOF balls, and six-DOF cage. The model considers the starved lubrication in the ball-raceway contact and the full multi-body interactions between the bearing components. With different ball-raceway starvation degrees being analyzed, the effects of starved lubrication on the bearing tribo-dynamic performance are first revealed. By comparison, it is found that the oil film thickness, the skidding performance, and the traction forces in the ball-raceway contact are significantly influenced by the starvation degrees. It is also found that the starvation-induced change of the ball-pocket contact force is dramatical under combined loads, and the maximum contact force under this load condition increases with the increasing starvation degrees.

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Starvation Effects on the Hydrodynamic Lubrication of Rigid Nonconformal Contacts in Combined Rolling and Normal Motion

Cited by 7 publications

References 20 publications

Effects of starvation and viscous shear heating in hydrodynamically lubricated rolling/sliding line contacts

Effects of starvation and viscous shear heating in hydrodynamically lubricated rolling/sliding line contacts

A new methodology to estimate starvation in ball bearings

Starved lubrication analysis of angular contact ball bearing based on a multi-degree-of-freedom tribo-dynamic model

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