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Influence of Surface Waviness on Predictions of Friction between Cylinder Liner and Oil Control Ring
Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.ORCID iD: 0000-0003-3149-4296
Mahle Metal Leve, Jundiai - Sao Paulo, Brazil.
University of Sao Paulo, Sao Paulo – SP, Brazil.
2015 (English)In: Proceedings of the 42nd Leeds – Lyon Symposium on Tribology, September 7-9, 2015, Lyon, France, 2015Conference paper, Abstract (Refereed)
Abstract [en]

It is of a vital importance for automotive industry to reduce the frictional losses in internal combustion engines and hence their fuel consumption and CO2 emissions. The major contributors to this are the oil control ring (OCR) and cylinder liner interactions. These interactions are of complex multi-physics and multi-scale nature and many attempts have been made to improve the modelling and understanding of the phenomena involved. Even though continuous improvements have been made (see for ex. [1-3]), the form, waviness and roughness variation of real engineering surfaces still cause a large scatter in the results. The most of the models include measured liner surfaces, which are then filtered to capture the micro-effects of the roughness scale. However, by doing this, the contact conditions change (asperity contact distributes more evenly, see Fig. 1) such that the part of the boundary friction reduces and the part of the hydrodynamic friction increases accordingly for a given engine speed. This study focuses on one of these multi-scale problems, namely on how the 3D measurement type/size and filtering affects the predictions of friction between cylinder liner and OCR of truck engines. Two types of 3D liner surface measurements were investigated: (i) interference (with an objective of 2.5x, size of 2.5x3.3mm) and (ii) 4x8mm stylus measurement. The form was removed by fitting and subtracting a 2nd order polynomial and the waviness was filtered out by using a robust Gaussian filter with three different cutoffs: 2.5mm, 0.8mm and 0.25mm. The friction behaviours (i.e. the Friction Mean Effective Pressure-FMEP) between the primary/ filtered liner surfaces and a perfectly flat ring surface were then simulated for different engine speeds. The relative errors of the OCR’s FMEPs with respect to the primary surface were evaluated and results discussed.

Place, publisher, year, edition, pages
2015.
Keyword [en]
Fuel consumption, Waviness, Contact, Cylinder liner
National Category
Tribology
Identifiers
URN: urn:nbn:se:hh:diva-29480OAI: oai:DiVA.org:hh-29480DiVA: diva2:855007
Conference
42nd Leeds – Lyon Symposium on Tribology, Lyon, France, September 7-9, 2015
Available from: 2015-09-18 Created: 2015-09-18 Last updated: 2015-09-18Bibliographically approved

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