Predictions for run-up procedures of automotive turbochargers with full-floating ring bearings including thermal effects and different bearing setups

摘要

Automotive turbochargers feature a variety of boundary conditions influencing the operating behaviour during run-up procedures. As a novel aspect the influence of the thrust bearing and load on lateral vibration phenomena is investigated in detail for this application. The run-up predictions show that the thrust bearing and load have significant influence on the frequencies as well as on the magnitudes of the vibrations. In particular, the amplitudes of conical vibrational modes are damped. Further, the consideration of the hot gas boundary conditions is identified as decisive in order to predict the bearing parameters and consequently the vibrations precisely.