Flutter and resonance -sorta the same thing-
I had the pleasure of working for years with a guy who had the ability to cut thru any BS theory.
We had a machine design problem -resonance.
I asked "how do we fix it?"
His reply "oh, we just do something."
I found out that there was really no single fix -but many ways of fixing resonance.
We could change material thickness slightly
or bend the material -slightly
or coat the material with something - a little bit.
etc..
perfect airfoil design is another area where "perfection" can be acheived in various means.- cut it short bend it change materials coat it etc..
On models most of the theory on sharp edges is just plain ol whimsey