Modelling of a Torsional Vibrations Viscous Damper Using Hydrodynamic Theory of Rotating Elements Lubrication

Abstract

Viscous dampers are one of the ways of reducing torsional vibrations in multi-cylinder internal combustion engine crankshafts. The damping element often used in this type of devices is a plunger immersed in silicone oil of very high viscosity. Until now the state of a damper has been modelled based on rather idealized assumptions and without any hydrodynamic analysis of the state of oil inside it. Unfortunately such models do not explain the reasons behind excessive and too fast wear of oil and the active surfaces of the damper. Searching for the causes of damper breakdowns, the authors decided to develop a new mathematical model based on the rotating elements lubrication theory. This paper explains the hydrodynamic modelling of a torsional vibrations viscous damper and discusses the problems that must be solved so that the model can be developed.