Influence of Circumferential Grooves on the Non-Linear Oscillations of Turbocharger Rotors in Floating Ring Bearings

10.6567/IFToMM.14TH.WC.OS14.006

G. Nowald；A. Boyaci；R. Schmoll；P. Koutsovasilis；B. Schweizer

Turbocharger rotors ； floating-ring bearings ； subsynchronous oscillations ； co-simulation

Proceedings of the 14th IFToMM World Congress

14th-4（2015 / 11 / 04）

447 - 453

英文

Numerical run-up simulations of an automotive turbocharger are carried out in order to investigate the influence of circumferential grooves on the non-linear vibration behavior. The turbocharger rotor is modeled as a flexible multibody system. The hydrodynamic bearing forces are calculated based on two different approaches. Firstly, a modified short bearing solution is derived. Secondly, a finite-element model is coupled to the rotor model by means of a co-simulation technique. The latter is used to validate the modified short bearing solution. The results with circumferential grooves are compared to the results obtained with plain cylindrical bearings.