**Author details**

Andreas Marn1\*, Christian Faustmann2 and Thorsten Selic3

\*Address all correspondence to: andreas.marn@tugraz.at

1 Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Graz, Austria

2 Audi AG, Ingolstadt, Germany

3 Elin Motoren GmbH, Preding/Weiz, Austria
