Integrated Tribological Analysis within a Multi- physics Approach to System Dynamics

Teodorescu, Mircea; Balakrishnan, Sashi; Rahnejat, Homer

doi:10.1016/s0167-8922(05)80074-4

Cited by 54 publications

(72 citation statements)

References 7 publications

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“…For further information on details of surface analysis the reader is referred to [24]. For a Gaussian distribution it is shown in [28] that a polynomial-fit function can be used to approximate the statistical integration as: (18) where, ≅ 3 is the critical value of film ratio, specifying the onset of mixed regime of lubrication.…”

Section: Asperity Contact Modelmentioning

confidence: 99%

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Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts

Shahmohamadi

Rahmani

Rahnejat

et al. 2017

Tribology International

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Section: Asperity Contact Modelmentioning

confidence: 99%

“…The limiting Eyring shear stress [31] of the lubricant used is 0 τ =2 MPa as is the case for the majority of engine lubricants. In addition, the statistical function ) ( 2 s F λ is given in polynomial form as [28]:…”

Section: Conjunctional Frictionmentioning

confidence: 99%

Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts

Shahmohamadi

Rahmani

Rahnejat

et al. 2017

Tribology International

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“…The ratio r/b which is a representation of the average asperity slope (Gohar and Rahnejat [40]) is in the range 10 -4 -10 -2 according to Teodorescu et al [43]. In the current study it is assumed that r 1 = r 2 , nbr = 0.055 and r/b = 0.001.…”

Section: Asperity Contact Model For Mixed/boundary Regime Of Lubricationmentioning

confidence: 99%

“…The boundary component of friction takes into account the direct dry asperity contact as well as the non-Newtonian shear of pockets of lubricant entrapped between the asperity tips, as (Teodorescu et al [43]):…”

Section: Friction Force and Power Lossmentioning

confidence: 99%

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Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

et al. 2015

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The paper presents a mixed thermo-hydrodynamic analysis of elliptic bore bearings using combined solution of Navier-Stokes, continuity and energy equations for multi-phase flow conditions. A vapour transport equation is also included to ensure continuity of flow in the cavitation region for the multiple phases as well as Rayleigh-Plesset to take into account the growth and collapse of cavitation bubbles. This approach removes the need to impose artificial outlet boundary conditions in the form of various cavitation algorithms which are often employed to deal with lubricant film rupture and reformation. The predictions show closer conformance to experimental measurements than have hitherto been reported in the literature. The validated model is then used for the prediction of frictional power losses in big end bearings of modern engines under realistic urban driving conditions. In particular, the effect of cylinder deactivation (CDA) upon engine bearing efficiency is studied. It is shown that bigend bearings losses contribute to an increase in the brake specific fuel consumption with application of CDA contrary to the gains made in fuel pumping losses to the cylinders. The study concludes that implications arising from application of new technologies such as CDA should also include their effect on tribological performance.

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Cavitation effects on textured compression rings in mixed lubrication

Zavos

Nikolakopoulos

2016

Lubr. Sci.

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Thin lubricant films and cavitation to ring-bore contact have a directly correlation between wear and emissions output of internal combustion engines. Thus, there is a need to develop innovate engineering solutions such as surface texturing. In particular, micro textures are manufactured in order to keep more lubricant in weakly lubricated contact. An isothermal mixed-hydrodynamic analysis was developed for textured compression rings, which utilised the effects of two-phase flow using Navier-Stokes equations, vapour transport and asperity interaction. Realistic boundary conditions are used from a real motorbike engine. This paper employs a computational model including multiphase flow of the ring-bore conjunction in order to predict the effects of surface texturing of the barrel face ring around the dead centres. The model is validated using numerical and experimental results from the literature. Additionally, flow simulations have been performed, on how micro-dimples shape and depth on the ring liner affect on the total friction and minimum lubricant film.

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Integrated Tribological Analysis within a Multi- physics Approach to System Dynamics

Cited by 54 publications

References 7 publications

Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts

Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts

Big End Bearing Losses with Thermal Cavitation Flow Under Cylinder Deactivation

Cavitation effects on textured compression rings in mixed lubrication

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