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Old 02-15-2013, 05:56 PM   #5
Erick Mead
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Dojo: Big Green Drum (W. Florida Aikikai)
Location: West Florida
Join Date: Jun 2005
Posts: 2,618
Re: Understanding "resonance"

Without passing on the remainder of the points being made I would note that most human bodies drive in resonance at ~5-7Hz and the first harmonic at ~10-12Hz.

Not coincidentally -- the frequency of furitama and tekubi furi is at about 10-12 Hz.

I would further note that oscillatory phenomena (alternating stress, opposite in sign) tend to be dominated by shear forces -- and shear forces are greatest at the surface of a structure, whether in bending or in torsion.

FWIW. Enjoy.

Last edited by Erick Mead : 02-15-2013 at 05:59 PM.


Erick Mead
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