Thermal elastohydrodynamic simulation of involute spur gears incorporating mixed friction

Bobach, Lars; Beilicke, Ronny; Bartel, Dirk; Deters, Ludger

doi:10.1016/j.triboint.2011.11.025

Cited by 79 publications

(65 citation statements)

References 27 publications

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“…In this study, an indirect/stochastic method proposed by Patir and Cheng [34] is employed to simulate the effects of surface roughness on the lubrication performance of CRCL because of its low cost in computation time and easy realization [33]. The generalized Reynolds equation with consideration of Patir and Cheng's approach and mass conservation JFO cavitation algorithm [35,36] is given as follows [37]:…”

Section: Governing Equationmentioning

confidence: 99%

Numerical analysis of the effects of compression ring wear and cylinder liner deformation on the thermal mixed lubrication performance of ring-liner system

Liu

Lü

Wang

et al. 2018

Mechanics & Industry

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The lubrication performance of roughness compression ring-cylinder liner system (CRCL) with axial-asymmetric new/worn compression ring and out-of-round cylinder liner is studied in this paper. By considering the oil film thermal effect, cavitation phenomenon, and surface roughness, the energy equations, mass conservation Jacoboson-Floberg-Olsson (JFO) cavitation algorithm, generalized average Reynolds equation, and Greenwood-Tripp asperity contact model are employed to investigate the frictional behaviors of CRCL. The oil film thickness, friction forces, wear, and power loss of CRCL are investigated at various wear stages of compression ring. The effects of the magnitude of cylinder liner deformation on the frictional characteristics of CRCL are also analyzed with consideration of compression ring conformability. Numerical results show that the deformation of cylinder liner and the wear of compression ring have a significant influence on the lubrication performance. It also suggests that the oil film thermal effect should be considered in the numerical analysis to provide an accurate prediction on the frictional behaviors of CRCL.

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Section: Governing Equationmentioning

confidence: 99%

Numerical analysis of the effects of compression ring wear and cylinder liner deformation on the thermal mixed lubrication performance of ring-liner system

Liu

Lü

Wang

et al. 2018

Mechanics & Industry

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“…Using equation (21), the characteristic time for the diffusion of heat accross the fluid/solid interfaces and into the thermal boundary layer of the solids simplifies to:…”

Section: Thermal Timementioning

confidence: 99%

“…New advances focus on topics such as roughness, starvation, boundary lubrication, etc. Bobach et al [21], e.g., incorporated mixed friction effects into a study on involute spur gears, revealing the importance of considering the topographies of the contacting surfaces. Surprisingly, a clear understanding of the onset and magnitude of the transient effects in TEHD configurations is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Characteristic times in transient thermal elastohydrodynamic line contacts

Raisin

Fillot

Dureisseix

et al. 2015

Tribology International

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The paper presents a numerical and analytical analysis on transient effects in Thermal Elasto-Hydrodynamic (TEHD) contacts subjected to fluctuations of their operating conditions. Firstly, the system of equations, boundary conditions and numerical scheme used in the model are described. In addition, developments to solve transient TEHD problems are detailed, on the basis of a previous work [1] dedicated to the study of steady state cases. Then, the phenomena at the origin of transient effects in TEHD contacts are reviewed along with their characteristic time. In this context, a particular focus is placed on the thermal contribution. The complexity in finding a relevant thermal characteristic time is illustrated by the influence of the slide-to-roll ratio (SRR) on the contact performance (film thickness and friction). The dependency of the dominant heat transfer mode on the SRR is showed. A distinction between low sliding, pure sliding and high sliding conditions is made. Each configuration is thoroughly analyzed, leading to the formulation of new thermal characteristic times. Finally, time-dependent TEHD computations are performed in order to investigate the onset of transient effects. A direct relationship with the dominant thermal time is established and validated through a parametric study on the contact operating conditions and on the solid material properties. Numerical simulation of transient Thermal Elasto-Hydrodynamic (TEHD) systems has several interests: understanding local behavior to prevent failure of a designated system, working conditions, fluid properties, overall design, etc. For practical applications, taking into account the thermal effects is mandatory, and since time-dependent operating conditions often apply, the decision to use a quasisteady or a transient model is also required. In this article, we derive, a priori, characteristic time scales for a generic line contact TEHD problem, and discuss the discrepancies between the two models depending on the dynamical character of the problem. A decision criteria is proposed and tested on various conditions to assess its validity.

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“…Simon 21 investigated the influence of machine tools setting on the lubrication performance in hypoid gears. Bobach et al 22 built a three-dimensional thermal EHL of spur gear pair incorporating mixed friction and discussed the effect of addendum modification and tooth width modification on the tribological properties. Based upon the fully coupled differential deflection approach for micro-EHL model, Evans et al 23 [30][31][32] As mentioned above, the most models of spur and helical gears have been assumed to operate under a fully flooded condition.…”

Section: Introductionmentioning

confidence: 99%

Thermal elastohydrodynamic lubrication analysis of helical gear pair under starved lubrication condition

Liu

Zhang

et al. 2019

Lubrication Science

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In the present study, thermal starved elastohydrodynamic lubrication (EHL) model is developed for a helical gear pair. The influences of inlet oil‐supply layer, input speed, lubricant viscosity, and surface roughness on the lubrication behaviour are investigated. The minimum film thickness, temperature rise of teeth surfaces and oil film, and the friction coefficient are predicted along the line of action (LOA). Results show that the effects of inlet oil‐supply layer, input speed, and lubrication viscosity on the tribological performance are remarkable. Under the starved lubrication, the influence of inlet oil supply on the temperature rise is insignificant. Meanwhile, the effect of surface roughness has been discussed. It reveals that the roughness texture along the entrainment velocity direction has significant influence on the lubrication characteristics. The results provide the tribological guidance for design of a helical gear pair in engineering.

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Thermal elastohydrodynamic simulation of involute spur gears incorporating mixed friction

Cited by 79 publications

References 27 publications

Numerical analysis of the effects of compression ring wear and cylinder liner deformation on the thermal mixed lubrication performance of ring-liner system

Numerical analysis of the effects of compression ring wear and cylinder liner deformation on the thermal mixed lubrication performance of ring-liner system

Characteristic times in transient thermal elastohydrodynamic line contacts

Thermal elastohydrodynamic lubrication analysis of helical gear pair under starved lubrication condition

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