A mixed lubrication model incorporating measured surface topography. Part 2: Roughness treatment, model validation, and simulation

Sahlin, Fredrik; Larsson, Roland; Marklund, Pär; Almqvist, Andreas; Lugt, Piet M.

doi:10.1243/13506501jet659

Cited by 64 publications

(68 citation statements)

References 23 publications

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“…Chen et al applied fast Fourier transform to calculate the elastic-plastic contact pressures as well as sub-surface stresses [11]. A way to implement ideal plastic behaviour was presented by Sahlin et al [32]. Given a force F a , the model presented by Sahlin et al can be used to calculate the average separation h between two measured surface topographies.…”

Section: Mixed Lubrication Modelmentioning

confidence: 99%

A two scale mixed lubrication wearing-in model, applied to hydraulic motors

Furustig

Almqvist

Bates

et al. 2015

Tribology International

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a b s t r a c tWearing-in of a machine component can increase the conformity between contacting pairs and smoothen the surface topography. A two scale model, combining the wearing-in effects, resulting in changes in the surface topography, with the wear that occurs on the component, is presented. The geometry of the components is represented with measured coordinates. Wear leads to changes of the geometry, which has an effect on several tribological conditions, such as contact forces, relative velocities and conformity. Due to the wear on the topography scale, the load sharing is also affected. The model is applied to orbital hydraulic motors. The wear depth predicted with the model is qualitatively in good agreement with the wear depth recorded in experiments.

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Section: Mixed Lubrication Modelmentioning

confidence: 99%

A two scale mixed lubrication wearing-in model, applied to hydraulic motors

Furustig

Almqvist

Bates

et al. 2015

Tribology International

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“…This model, unlike the more common approach by Greenwood and Tripp [29], numerically deforms a real, measured, surface topography to give the average asperity contact pressure as a function of separation. The technique is described in detail by Sahlin et al [30,31] and will not be repeated here. The piston ring, R a = 0.066µm, is rather smooth compared to the liner surfaces and is therefore assumed to perfectly smooth during the numerical simulations.…”

Section: Calculation Of Flow Factors and Asperity Contact Pressuresmentioning

confidence: 99%

An experimental and numerical investigation of frictional losses and film thickness for four cylinder liner variants for a heavy duty diesel engine

Spencer

Avan

Almqvist

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part J:

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.An experimental and numerical investigation of frictional losses and film thickness for four cylinder liner variants for a heavy duty diesel engine AbstractThe piston ring pack is the single greatest contributor to mechanical losses in a Heavy Duty Diesel Engine (HDDE), accounting for 1.1-6.8% of the total losses. Therefore, the piston ring-cylinder liner contact is potentially the most rewarding area to study when attempting to reduce mechanical losses in a HDDE. In this work, four different HDDE cylinder liner variants have been tested to evaluate the lubricating conditions that occur when a section of top compression ring is reciprocated against them in a lubricated environment. Two of the cylinder liners were traditional grey cast iron and plateau honed with different honing angles, one had ANS Triboconditioning ® applied and the last was plasma sprayed with a stainless steel and ceramic coating, then honed. An experimental test rig was used where friction and film thickness was recorded, by means of an ultrasonic technique. A numerical model was also developed to calculate the friction and film thickness. Comparisons are made between the simulation and experiment, and the four cylinder liner variants are also evaluated. It was found that both simulation and experiment could differentiate between all surfaces and the results from the model and experiment also correlated well with each other. A lower plateau average surface roughness, as exhibited by the ANS Triboconditioning ® and plasma liners, led to a significant reduction in friction.

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“…When the surfaces come into contact the deformation is found using a boussinesq-type elasto-plastic contact mechanics model. The whole technique is described in detail by Sahlin et al [29,30] and will not be repeated here.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Once the velocity is known a force balance is solved where the film thickness is calculated which balances the applied load with the hydrodynamically supported load and the load supported by asperity contact (from the contact mechanics model [29,30]). …”

Section: Numerical Modelmentioning

confidence: 99%

Experimental and numerical investigations of oil film formation and friction in a piston ring–liner contact

Avan

Spencer

Dwyer-Joyce

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part J:

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The piston ring-cylinder liner contact is a major source of the total parasitic losses in an internal combustion engine. The lubrication regime formed in this contact is critical to the amount of friction, oil consumption and wear that occurs. In this work, a reciprocating test rig combined with an ultrasonic film thickness measurement system was used for the tribological investigation of the piston ring-cylinder liner contact. Furthermore, a numerical model has been developed for all lubrication regimes to predict the film thickness and friction. A special piston ring and cylinder liner holder were designed and five sensors were glued on to the back side of the liner specimen. Ultrasonic reflections captured by the sensors, used to obtain the film thickness and friction were continuously recorded as the piston ring reciprocated over the liner. Several experiments have been performed at different speed and load conditions. The experimentally measured film thickness and friction are compared with the output from the numerical model and good correlation is found. The parameters affecting the accurate measurement and simulation of film thickness and friction are then discussed.

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A mixed lubrication model incorporating measured surface topography. Part 2: Roughness treatment, model validation, and simulation

Cited by 64 publications

References 23 publications

A two scale mixed lubrication wearing-in model, applied to hydraulic motors

A two scale mixed lubrication wearing-in model, applied to hydraulic motors

An experimental and numerical investigation of frictional losses and film thickness for four cylinder liner variants for a heavy duty diesel engine

Experimental and numerical investigations of oil film formation and friction in a piston ring–liner contact

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