OIL INFLUENCE OVER DYNAMIC STABILITY OF ROLLING BEARING AND HYDRODYNAMIC BEARING TURBOCHARGERS

Abstract

The dynamic stability of rotating machines can be influenced by some functional parameters than can in some functional conditions, rise or decrease the running performances of the rotating machines. One of the main parameters that can majorly influence the dynamic stability of the rotating machines is represented by the oil film. The objective of this st udy is to highlight some aspects related to oil film influence over the dynamic performances of diesel engines turbochargers rotors sustained by rolling bearings or hydrodynamic bearings. The study brings into audience attention some experimental data related to turbocharger rotordynamic stability, data gathered from test rig testing of modern turbochargers that can reach functioning speeds beyond 250000 rpm.