Elastoplastic contact of rough surfaces: a line contact model for boundary regime of lubrication

Chong, William Woei Fong; Cruz, Miguel De la

doi:10.1007/s11012-013-9861-1

Cited by 26 publications

(19 citation statements)

References 40 publications

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“…A reciprocating slider bench test rig has been developed and described by Chong and De la Cruz et al 34 ( Figure 1). A sliding thin strip slider with a face-width profile, representative of an engine compression ring is loaded against the flat plate, with a thin layer of lubricant applied.…”

Section: Reciprocating Sliding Contactmentioning

confidence: 99%

Combined numerical and experimental investigation of the micro-hydrodynamics of chevron-based textured patterns influencing conjunctional friction of sliding contacts

Morris

Leighton

Cruz

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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Reciprocating and low-speed sliding contacts can experience increased friction because of solid boundary interactions. Use of surface texturing has been shown to mitigate undue boundary friction and improve energy efficiency. A combined numerical and experimental investigation is presented to ascertain the beneficial effect of pressure perturbation caused by micro-hydrodynamics of entrapped reservoirs of lubricant in cavities of textured forms as well as improved microwedge flow. The results show good agreement between numerical predictions and experimental measurements using a precision sliding rig with a floating bed-plate. Results show that the texture pattern and distribution can be optimised for given conditions, dependent on the intended application under laboratory conditions. The translation of the same into practical in-field applications must be carried out in conjunction with the cost of fabrication and perceived economic gain. This means that near optimal conditions may suffice for most application areas and in practice lesser benefits may accrue than that obtained under ideal laboratory conditions.

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Section: Reciprocating Sliding Contactmentioning

confidence: 99%

Combined numerical and experimental investigation of the micro-hydrodynamics of chevron-based textured patterns influencing conjunctional friction of sliding contacts

Morris

Leighton

Cruz

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…As a result, gear meshing forces have a reduced magnitude so that the lubrication regime in the tooth contact is fundamentally hydrodynamic (HDL). To identify among regimes of lubrication, some parameters have been developed by the research community, being two of the most commonly used the Greenwood parameters and the Stribeck ′ s one (λ), which is the ratio between the fluid film thickness and the roughness of the teeth profile (λ = h/Ra) [4,5]. In this work, these parameters were utilized to assure that the transmission was on HDL regime.…”

mentioning

confidence: 99%

Gear transmission rattle: Assessment of meshing forces under hydrodynamic lubrication

2019

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Noname manuscript No.(will be inserted by the editor) GEAR TRANSMISSION RATTLE: ASSESSMENT OF MESHING FORCES UNDER HYDRODYNAMIC LUBRICATIONA. Fernandez-Del-Rincon · A. Diez-Ibarbia · S. TheodossiadesReceived: date / Accepted: date Abstract The dynamic behavior of gear transmissions poses several challenges from the standpoint of design and requires the availability of more advanced models capable of simulating a wide range of operating conditions. In this paper, several formulations to represent efforts related to the lubricant in gear transmissions subjected to reduced torque levels has been assessed. Under these conditions, the lubrication regime is hydrodynamic and the dynamic behavior of the meshing contacts can happen in different scenarios depending on both the lubricant properties and operating conditions. Such problems are cumbersome in gear transmissions in which acoustic performance is a determining design factor, such as in car applications. In this regard, gear rattle is one of the subjects of concern by powertrain designers. In spite of several authors have approached this phenomena, the most recent interest is focused on the role played by the lubricant. The variety of fundamentals and aims of the developed models in this respect requires a better understanding of the effect taken into account by the different formulations in the accurate modeling of hydrodynamic lubrication in gears subjected to low torques. This is the reason why, in this work, several alternatives currently available in the literature to address the formulation of efforts in hydrodynamic regime was collected and presented. Such formulations were implemented in a transmission model previously developed by the authors which was used to simulate different operating conditions in order to assess the results obtained with each one of the considered formulations.

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“…Increase in fluid speed (V) leads to an increase in the Sommerfeld number (left to right on the x-axis in Figure 5B). Lubrication regime transition parameter "λ" is defined as the ratio of film thickness to the surface roughness (λ = t/r, t = film thickness, r = surface roughness; for BDL, λ < 1.2; for ML: 1.2 < λ <3; for HDL: λ > 3) (Chong and Cruz, 2014). Because the lubricant in EV would be of a lower viscosity than that in ICE vehicle, the initial film thickness (t) would be lower in EV than in ICE (i.e., t EV < t ICE ).…”

Section: Vehicle Performance In View Of Lubricants Frictional Performmentioning

confidence: 99%

Performance Characteristics of Lubricants in Electric and Hybrid Vehicles: A Review of Current and Future Needs

et al. 2020

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Electric and hybrid vehicles are gaining increasing attention in recent years. The distinguished difference between electric/hybrid vehicles from conventional ones is the intermittent on-and-off control of the internal combustion engine, whereas the electric vehicles operate on electrical motors. This difference creates new requirements in lubricants with performance characteristics that are otherwise uncritical: electrical properties (such as electrical conductivity and breakdown voltage) and thermal properties (thermal conductivity, specific heat, among others), in addition to fluidic performance that we have studied for decades. In this review, we discuss about lubricants for electric and hybrid vehicles in the following aspects. Starting with a brief historic review, we gathered information about current needs and challenges in electric and hybrid vehicles. We then compared the properties of lubricants, followed by the performance difference of those vehicles in terms of frictional performance, thermal management, and dielectric breakdown. Performance parameters are critically dependent on the properties of lubricants that are crucial for energy efficiency and reliability. This review can be used as a guidance for the future design of advanced lubricants for electric and hybrid vehicles.

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Elastoplastic contact of rough surfaces: a line contact model for boundary regime of lubrication

Cited by 26 publications

References 40 publications

Combined numerical and experimental investigation of the micro-hydrodynamics of chevron-based textured patterns influencing conjunctional friction of sliding contacts

Combined numerical and experimental investigation of the micro-hydrodynamics of chevron-based textured patterns influencing conjunctional friction of sliding contacts

Gear transmission rattle: Assessment of meshing forces under hydrodynamic lubrication

Performance Characteristics of Lubricants in Electric and Hybrid Vehicles: A Review of Current and Future Needs

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