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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/22657

Title: Elastodynamics of piston compression rings
Authors: Turnbull, Robert
Bewsher, S.R.
Mohammadpour, Mahdi
Rahmani, Ramin
Rahnejat, Homer
Offner, Gunter
Keywords: Compression ring
Incomplete ring
Coupled bending-torsion
Issue Date: 2016
Publisher: © The Authors
Citation: TURNBULL, R., 2016. Elastodynamics of piston compression rings. Presented at the 3rd Biennial International Conference on Powertrain Modelling and Control (PMC 2016), Loughborough University, 7-9th Sept.
Abstract: The piston ring pack accounts for a disproportionate amount of the total engine frictional losses. The frictional behaviour of piston rings is significantly affected and governed by its flexible dynamics. The dynamically changing shape of the ring determines its contact geometry with the cylinder liner and hence affects the frictional losses. The compression ring undergoes a multitude of complex motions during the engine cycle prescribed by the gas pressure, contact reaction, ring tension, friction between the ring and its groove and inertial forces that excite a plethora of the ring’s modal responses. This adversely compromises the functionality of the ring through a number of undesired phenomena such as ring flutter, twist, rotation and jump. Therefore, a prerequisite for improving the prediction of tribological conditions is an accurate determination of the ring’s elastodynamic response. This paper presents a methodology to directly solve the governing differential equations of motion for different forms of beam cross-section, where the shear and mass centres are not coincident, typical of the complex cross-sections of a variety of different piston compression rings. Combined numerical and experimental investigations are undertaken to determine the dynamic behaviour of the compression ring.
Description: This is a conference paper.
Sponsor: This work was funded by the Engineering and Physical Science Research Council (EPSRC) and AVL List GmbH under the EPSRC-CDTei collaborative funding.
Version: Accepted for publication
URI: https://dspace.lboro.ac.uk/2134/22657
Publisher Link: http://www.pmc2016.net/
Appears in Collections:Conference Papers and Contributions (Mechanical, Electrical and Manufacturing Engineering)

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