Harmonic resonance is the bane of mechanical engineers, and especially aircraft engines.
Spent 36 years in aviation maintenance and I’m familiar with Harmonic resonance but I’ve never heard of it in regards to an ejection event......I guess it’s possible.
Couple of wheel weights on the end of a a few turbine blades should do it.
“Harmonic resonance is the bane of mechanical engineers, and especially aircraft engines.”
I’d add bridge/ structural engineers and provide an example of that bridge in the Pacific NW that shook itself to pieces back in the 1940s.
Picked up an Engineering class a few years ago where the instructor showed a clip of a CH-46 (chained down) and it just beat itself to pieces during ground runs.
IIRC, harmonic resonance was tearing the wings off of early Lockheed Electras.
Ever hear of a phenomenon in helicopters called "ground resonance"?
https://en.wikipedia.org/wiki/Ground_resonance
It only happens to 'copters with articulated rotors and some sort of impact damping system on the landing gear (pneumatic wheels, oleo struts, or even thick rubber bushings on the saddle tubes of skids). The a/c enters a positive feedback loop and when it's pronounced enough to be noticeable, it's probably irreversible and the aircraft is going to shake itself to death.
https://www.youtube.com/results?search_query=ground+resonance
Frightening to watch, especially if you've ever been inside on of them thangs.