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nzur
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Join Date: Apr 2008
Posts: 96
Good Answers: 1

Human Body as a Low-Pass Filter?

03/03/2009 2:16 AM

I am just wondering if there is any referece related to which human body functions like low-pass filtering in response to surface vibration or so...

simply say, if high-frequency noise(surface vibration) were applied to human's foot, human does not percept it...

thanks in advance..
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nick name
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Join Date: Mar 2007
Location: City of Light
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Good Answers: 183
#1

Re: Human body as a low-pass filter ?

03/03/2009 3:50 AM

Have you tried to find research results on the subject?

As far as I know several have been done especially related to the effect of tools (pneumatic hammers or dynamic torque wrenches) on the hand and other parts of the body.

The parts behave as inertias linked by elastic elements and with a damping in the articulation (sinovia).

Following sketch was done on information I have not any more to explain why pulse tools can deliver important torques without harm for the operator.

You can make some measures of the compliance of the contact and then make a model where you consider the disturbance as a surface displacement generating via the above mentioned compliance the force acting on the rest of the body. You will see that the higher the frequency the lower its impact on parts at a quite low distance from the introduction zone.

Several years ago tests were done also for the analysis of eyes following capability in case of vertical displacements of the body.
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Anonymous Poster
#2
In reply to #1

Re: Human body as a low-pass filter ?

03/03/2009 9:02 AM

Yes, our tests have also shown that Frenchmen roll off at 6 dB/octave on average.

However, careful measurements of drunk Englishmen have shown roll-off rates averaging 24 dB/octave, but one fellow from Norwich came in at an astounding 42 dB per octave @ 0 Hz. A home-brewer I believe. Something to do with carrot juice.
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nick name
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Join Date: Mar 2007
Location: City of Light
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#3
In reply to #2

Re: Human body as a low-pass filter ?

03/03/2009 10:01 AM

I am sorry to disappoint you but the data used for the graph were not obtained in France, they came from a research in an other country. Unfortunately I do not remember which one.
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Epke
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#4

Re: Human Body as a Low-Pass Filter?

03/03/2009 11:15 PM

Well depends on the spot doesn't it, i know of certain parts of the male/Female that react to vibration

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