Turnbull, R. PMC 2016.pdf (538.65 kB)
Elastodynamics of piston compression rings
conference contribution
posted on 2016-10-04, 13:00 authored by Robert Turnbull, Stephen R. (Rickie) Bewsher, Mahdi Mohammadpour, Ramin Rahmani, Homer Rahnejat, Gunter OffnerThe 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.
Funding
This work was funded by the Engineering and Physical Science Research Council (EPSRC) and AVL List GmbH under the EPSRC-CDTei collaborative funding.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
3rd Biennial International Conference on Powertrain Modelling and Control (PMC 2016)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.Publisher
© The AuthorsVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2016-09-01Publication date
2016Notes
This is a conference paper.Publisher version
Language
- en