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Title: On the effect of transient in-plane dynamics of the compression ring upon its tribological performance
Authors: Baker, Christopher E.
Rahmani, Ramin
Theodossiades, Stephanos
Rahnejat, Homer
Fitzsimons, Brian
Issue Date: 2014
Publisher: © ASME
Citation: BAKER, C.E. ... et al, 2014. On the effect of transient in-plane dynamics of the compression ring upon its tribological performance. Journal of Engineering for Gas Turbines and Power, 137 (3), 032512.
Abstract: Energy losses in an internal combustion engine are either thermal or parasitic. The latter are the mechanical inefficiencies, chiefly as the result of generated friction. Nearly half of these losses are attributed to the piston–cylinder system. During idle and at low engine speeds, friction is the major contributor to the overall engine losses. In particular, the rather small top compression ring accounts for a disproportionate share. Therefore, detailed understanding of compression ring tribology/dynamics (referred to as tribodynamics) is essential. Moreover, the ring’s primary sealing function may be breached by its elastodynamic behavior. The reported analyses in literature do not account for the transient nature of ring elastodynamics, as an essential feature of ring–bore tribology. The transient in-plane dynamics of incomplete rings are introduced in the analysis and verified using a finite element analysis (FEA) model, in order to address this shortcoming. The methodology is then coupled with the tribological analysis of the top compression ring. Comparison is made with experimental measurements which show the validity of the proposed method. The radial in-plane elastodynamic response of the ring improves the accuracy of the frictional power loss calculations.
Description: This article was published in the Journal of Engineering for Gas Turbines and Power [© ASME] and the definitive version is available at: http://dx.doi.org/10.1115/1.4028496
Sponsor: The authors wish to express their gratitude to the Engineering and Physical Sciences Research Council (EPSRC) for the funding of the Encyclopaedic Program Grant (www.Encyclopaedic.org), under which this research is carried out in collaboration with a consortium of industry and academic institutions. Thanks are also due to Aston Martin for financial and technical support.
Version: Accepted for publication
DOI: 10.1115/1.4028496
URI: https://dspace.lboro.ac.uk/2134/16636
Publisher Link: http://dx.doi.org/10.1115/1.4028496
ISSN: 0742-4795
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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