Influence of measurement and filtering type on friction predictions between cylinder liner and oil control ring

• Published in: Tribology international 2016-08, Vol.100, p.7-17
• Main Authors: Dimkovski, Z., Tomanik, E., Profito, F.
• Format: Article
• Language: English
• Subjects: Cylinder liners; Friction simulations; Stylus vs interferometer; Surface filtration
• ISSN: 0301-679X; 1879-2464; 1879-2464
• DOI: 10.1016/j.triboint.2015.10.014

It is of a vital importance to reduce the frictional losses in the engines and hence the fuel/energy consumption. The major contributors to this are the oil control ring and cylinder liner interactions difficult to understand when comparing the experimental and theoretical results. The latter largely depend on the liner surface measurement and filtering type used in the simulations. Therefore, low-pass and high-pass filtrations were applied and the friction behaviors between the filtered liner surfaces and a perfectly flat ring surface were simulated for different engine speeds. The surfaces low-pass filtered by lower cutoffs showed higher friction, while the type of de-noising revealed about two and a half times higher friction. Stylus surfaces showed larger friction than the interference ones. •Method for finding the dominant scale affecting the friction prediction is proposed.•The de-noising technique is the largest factor influencing the friction predictions.•Surfaces low-pass filtered by lower cutoffs exhibit higher friction.•Stylus surfaces show larger friction than interference ones if similarly filtered.