Improvement of dynamic behaviour of semi-floating turbocharger with focus on harmonic vibrations

The aim of the project is a detailed investigation of the non-linear behaviour of a semi-floating turbocharger for the whole operation range. For this task a model is necessary, which describe the eigenbehaviour of the rotor and further include a detailed bearing model as well as a suitable thermal model. In addition the simulations have to be compared with measurements. Finally, suggestions shall be stated to reduce the harmonic vibrations by change of geometrical parameters and by improvement of the balancing process always in the context of resulting friction power and subharmonic vibrations.