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RE: accelerometer

Posted by pictureguy (A) on August 20, 2010 at 11:30:25

In Reply to: RE: accelerometer posted by JBen on August 20, 2010 at 00:39:42:

Years ago, at the Lucerne (switzerland) transportation museum, they had an old bicycle. Logical for a transpo museum, right? Well, it was a standard design 'diamond' frame .....made from BAMBOO.
Even the rear triangle.

That is what got me thinking of 'natural composites'......

Too bad you can't get Bamboo boards!

Next is just my opinion:: Frame stiffness plays into this whole schmear. A frame of low stiffness, like MDF, for example, will have a low resonant frequency. It
'flops' around. Stiffer may have a higher resonant frequency. This is for any single material, since characteristics vary from material-2-material. Also, the MASS of material matters....How much does the darn thing weigh? The mass effects how much energy of a given frequency it would take to set up 'standing waves' at resonance. That energy which seems to be self-sustaining. The whole thing 'rings like a bell'. If you want a huge amount of energy absorption and no resonance, try LEAD. The panel would need either a concrete slab floor or a substantial sub-floor if in a house with a basement.

The panels active element apparently has near zero stiffness and thus will resonate at a broad range of frequencies even at low amplitudes. This is why 'stiffness' works. But, PG is correct, IMO that the energy has to go SOMEWHERE. It all ends up as heat, sooner or later. Allowing the wood to 'sing' distributes the energy and at the same time the nature of wood as, in effect, a composite, distributes the frequencies so there is no dominant resonant mode.

But that's just an opinion. That's why it is so important to me to come up with a theoretical framework with which to design a frame/ support system. I may be nuts!



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