ANALYSIS OF SELECTED CASES OF IMBALANCE AND DYNAMIC PROPERTIES OF TURBOCHARGER ROTATING ASSEMBLIES

The efficiency and reliability of the propulsion system of, for example, a vessel equipped with a supercharged combustion engine, largely depend on a properly working turbocharger. Despite the use of a sophisticated bearing system and a turbocharger rotating assembly, its constructors struggle with ensuring its dynamic stability. This study presents a dynamic model of a turbocharger rotating system, along with the corresponding numerical calculations. The model addresses the issue of vibration damping in non-locating plain bearings and its impact on the rotating unit of the turbocharger. As a result of numerical calculations, the areas of stable operation of the rotating unit were obtained. It can be concluded that the floating ring bearings used in the turbocharger effectively suppress the vibroacoustic effects accompanying the operating rotating assembly. Furthermore, the analyses indicate that the causes of turbocharger malfunction can be attributed to excessive imbalance in the rotating assembly and the improper stiffness of the rotating unit. The presented research may be beneficial in practice, providing insight into how to extend the service life of not only the power unit itself, but also the turbocharger.