bsieker
Here is a Bae146 engine with an exploded combustion chamber, that also took out the cowlings.
The vibration we can see on the B777 failure may be aerodynamic, as the slipstream runs around the decidedly non-aerodynamic N1 fan. Those fat cowlings are not there for normal flight - they are designed to allow smooth airflow around the engine after it fails (and the airflow spills out around the front of the engine). Take the cowling away, and the resulting turbulence is bound to make it shake, rattle, and roll...
Bae146 combustion chamber failure:
https://news.aviation-safety.net/201...engine-repairs
The ALF507 was not the best of engines, and had a variety of N1, compressor, combustion-chamber, and turbine-section failures. Which is why the aircraft was unfairly known as the Bring Another Engine 146. Or the Cockroach, for short.