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A good example of harmonics
Sounds like this one has been goin' for a while, and it's all over but the cryin'.
In aviation, we take harmonics very seriously, and I am constantly amazed at the fatigue which is caused by seemingly unrelated components. As a very graphic demonstration on harmonic resonance, go to youtube and search "helicopter resonance CH-47" (I'm trying to avoid any copyright problems by not posting a link)
If you aren't already convinced of the dangeers, you will be after watching this. If I remember correctly, This was caused by one blade which was out of balance with the rest.
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