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Inspired by this question on Music beta SE, I'm wondering if the human body has a strong resonant frequency. I guess the fact that it's largely a bag of jelly would add a lot of damping to the system, but is that enough to dampen it entirely?

What models for resonance might be used to model the human body? (E.g. weight-on-a-spring, with legs as springs?) What about individual, semi-independent body parts, like legs, or lung cavity (acoustic resonance?).

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what do you mean by that? –  Self-Made Man Sep 26 '13 at 17:46
@KaziarafatAhmed: What do you mean by "that"? –  naught101 Sep 27 '13 at 2:13

3 Answers 3

up vote 12 down vote accepted

There seem to be a lot of human body mechanical models, such as this one: enter image description here

As for applications, I have heard that sub-audio frequency vibrations have been considered as nonlethal weapons for riot control.

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That is a most awesome diagram. –  naught101 Sep 21 '12 at 12:12
@naught101, note however, that I do not quote the study, that produced those numbers :( –  Vorac Sep 21 '12 at 12:54
great answer... –  Self-Made Man Sep 26 '13 at 17:48
I agree awesome diagram. It also confirms a story a friend of mine told about an engineer that worked for a company that makes huge shaker tables. Supposedly this engineer, working on top of the table lost his bowels when the frequency sweep passed through 7 Hz. That agrees with the 4-8 Hz abdominal mass natural frequency shown. –  docscience Oct 15 '14 at 22:26
riot control? this must be related to brown noise –  Marcel Köpke Mar 18 at 20:21

I have just noticed the question. Indeed, the body does have very clear resonances. Nature has prioritised speed of movement over stability so limbs are underdamped and naturally resonant. It is likely that many rhythmic movements occur at the resonant frequency of the body parts involved (rather similar to the oscillation of some insect wings). A complication is that, like many biological tissues, muscles are very non linear and are actually much stiffer for small displacements than for large ones. This means that, for example, the resonant frequency of the human wrist is about 2 Hz for large oscillations but rises to ~ 10 Hz for small ones. There is some physiological literature on this subject - my late colleague and friend EG Walsh described some of it in his book, Muscles masses and Motion (1992, CUP). More recently I have been very interested in the contribution of resonance to the small, normally unnoticeable tremor that all humans have.

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Have you heard of Royal Raymond Rife? To the best of my knowledge, he pioneered research into human frequencies and ended up developing a cure for cancer back in 1934! See for yourself: Google his name.

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