RESONANCE 2023

Keynotes

Nonlinear on-board rotordynamics - Pr Régis Dufour
INSA Lyon, LaMCoS, UMR CNRS 5259

Unperfect balancing, pedestal motion, rotor-stator interaction, multi-field physics coupling, are capable of triggering nonlinear phenomena that can threaten the integrity of rotating machines.  It is therefore essential to predict their nonlinear dynamic behavior in order to be able to avoid the occurrence of such phenomena. The presentation focuses on theoretical and experimental investigations for establishing Finite Element models as reliable as possible. A particular attention is paid on a 6-DOF shaker, unique in the French university, which permits carrying out the tests. The illustrations address several industrial applications dealing mainly with on-board rotors subject to multi-excitations.

 

 

 

Tackling a challenging problem: diagnosis of helicopter planetary gear rim crack – with a historical reflection of DSTG’s gearbox diagnostics work - Senior Scientist Wenyi Wang

Aerospace Division, Defence Science and Technology Group, Australia

 

This keynote will address a worldwide challenging problem - finding solutions to detecting the planetary gear rim cracking in helicopter main rotor gearboxes. This failure mode caused two fatal helicopter crashes in recent years, and these is no reliable means of detecting the gear fault. Defences Science and Technology Group (DSTG) generated a dataset in an accelerated rim crack propagation test with the Bell-206B helicopter main gearbox as the test article, and shared the dataset with the international HUMS/PHM community. With this dataset, DSTG conducted a benchmark analysis using the conventional signal processing and machine learning techniques. This keynote will present the results of this analysis with a historical reflection of DSTG's work of gearbox diagnostics in the last four decades.

 

 

 

 

eVTOL Noise acceptance : a short overview from the perspective of a helicopter manufacturer - Dr. Julien Caillet - Acoustic  Expert

Airbus Helicopter, Mariagne, France

 

New technologies such as distributed electric propulsion and autonomy offer new opportunities for VTOL designs and operations. They are also new challenges for engineers, since noise may be a major barrier for a large deployment of such new vehicles. The presentation will focus on eVTOL noise and will include discussion on the noise sources, acceptance, and the potential solutions to reduce noise for communities and passengers. Dr. Julien Caillet is an acoustic expert at Airbus Helicopters, also in charge of noise certification activities. He had a PhD on helicopter interior noise diagnosis and modelling in 2006. He has over 20 years of acoustics engineering and project management experience with expertise in developing low noise technology for helicopters. He currently supports UAM acoustics activities within Airbus Group and coordinates research projects on Helicopter & eVTOL Low noise design and acceptance.