Elastodynamics of the Compression Ring for Evaluation of Ring-Liner Conformance

Abstract

The piston ring pack accounts for a disproportionate amount of the total engine losses (up to 25% of parasitic, with the compression ring accountingfor approximately 5% of engine losses)[1], especially when considering the size of the component. Certain challenges posed by a low carbon future, coupled with the multitude of vehicles currently utilizing the internal combustion engine andtheexpected global increase in vehicle demand,motivates engineers toimprove engine efficiency. The paper aims to investigatethe effectof piston ring packdynamicson the frictional losses. Theringdynamic behaviour determinesthe contact in terms of ring-liner conformability, applied load and kinematics. These are used as key input parameters intribological models which predict contact pressure distribution,film thicknessand generated friction.