Computational Modelling of Piston Ring Dynamics in 3D

Abstract

Advanced computational models of a piston assembly based on the level of virtual prototypes require a detailed description of piston ring behaviour. Considering these requirements, the piston rings operate in regimes that cannot, in general, be simplified into an axisymmetric model. The piston and the cylinder liner do not have a perfect round shape, mainly due to machining tolerances and external thermo-mechanical loads. If the ring cannot follow the liner deformations, a local loss of contact occurs resulting in blow-by and increased consumption of lubricant oil in the engine. Current computational models are unable to implement such effects. The paper focuses on the development of a flexible 3D piston ring model based on the Timoshenko beam theory using the multibody system (MBS). The MBS model is compared to the finite element method (FEM) solution.

Keywords

• PÍSTNÍ KROUŽEK
• TIMOSHENKOVA TEORIE NOSNÍKU
• MECHANICKÉ ZTRÁTY
• MBS
• PISTON RING
• TIMOSHENKO BEAM THEORY
• MECHANICAL LOSSES
• MULTIBODY SYSTEM