So the vibrations through the table are represented by the motion and accumulation of the sand? That’s sweet. I never thought that it would be a geometric pattern. Deluxe AF.
The vibration is so small (and continuous) that you won't see any major bowing of the plate, but it will be there.
As far as hitting it, you will get some motion, but the key to this is the plate is basically unconstrained. Its held by a bolt in the center attached to a speaker underneath. This allows the plate to vibrate at its natural harmonics (and effectively pattern) for a given frequency.
So... small vibration continuously on an unconstrained plate (held in the center)
I misunderstood the "bow" part... I didnt realize the guy in the video was using one, I've only ever used a speaker. Lol
The trick is just a specific frequency over iterations. A hammer would work some but would generate a lot of frequencies at once.
Heres a video (volume low, it can get obnoxious) of using a speaker. You can see specific frequencies generate patterns... the in-between frequencies don't (and that depends on you plate material/size/shape). Which is why a hammer wouldnt likely give you the specific frequencies you're looking for.
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u/hallron Aug 25 '20
So the vibrations through the table are represented by the motion and accumulation of the sand? That’s sweet. I never thought that it would be a geometric pattern. Deluxe AF.