Jerome Guillen PhD dissertation at University if Michigan
Snecma (now Safran) was the data source/sponsor of his work, focused on turbine blade stability;
The Safran geared open rotor turbofan was in development when the Guillen work was done although the illustrations and topic dealt with rotor blade vibration damping. These engines use highly robust clutches primarily in engine starting and APU management, but these operations are in highly precise,, hot and high velocity conditions. All modern large turbines have similar issues, but the open rotor geared turbines only recently have been practical because of these constraints.
The relevance to Tesla is that these applications work in large part by synchronizing speeds without load allowing clutches to be robust and durable.
How these principles were adapted to facilitate Semi power management has nit been disclosed.
