Electronics > Beginners

Need vibration 24/7 for a few weeks without breaking

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Kleinstein:
1 mm displacement is already a lot for a 500 g sample. The speaker would get that much only in resonance. Mechanical resonances tend to be relatively high Q  (typical Q is more like 100-1000) and can thus give a significant larger vibration.

1 mm displacement at audio frequency gives a hell lot of acceleration !  :popcorn:

I did that once with a resonant system - but this was one with exceptional low damping and a very small system, so that very little power was sufficient.

The motor with imbalance usually gives a 2 D movement, not just linear.

joeqsmith:

--- Quote from: mortrek on June 23, 2019, 07:41:57 pm ---I need very little actual displacement (<1mm probably), not sure exactly about weight (<1/2 pound).

--- End quote ---


--- Quote from: Kleinstein on June 23, 2019, 08:23:55 pm ---1 mm displacement is already a lot for a 500 g sample. The speaker would get that much only in resonance. Mechanical resonances tend to be relatively high Q  (typical Q is more like 100-1000) and can thus give a significant larger vibration.

1 mm displacement at audio frequency gives a hell lot of acceleration !  :popcorn:

--- End quote ---

0.5lbs would be about 250g.    With my four cheap speaker setup with DC applied, it will lift the weight of the table along with 200grams about +5mm.  Of course it can also lower the table.  The weight will add an offset to the position but again, it's a closed loop system using position feedback.   I suspect the drivers the kids use in their cars would easily lift this amount of weight at DC. 

A friend of mind gave me a much larger driver that was used to get the base for their home stereo.  I played around with it a bit and it appears it would easily out perform my current setup.

OP will just need to experiment with it to see if it can work for their application.   The following paper may be helpful.

https://pdfs.semanticscholar.org/ae56/0d0290985ec64fb901c3cdb5970c17d52514.pdf

Mr. Scram:
Industrial vibrators are often run on air. It's a circular track with a ball bearing circling around due to a jet of pressurized air. Not much to break, very reliable and probably overkill for your situation but maybe it can serve as an inspiration. Below is another example with an offset weight in a wheel.



bsudbrink:
Try googling for "shake table".  You will come up with a bunch of industrial hits as well as a fair number of DIY pages.  I don't know about "weeks", but the shake table we have at my work runs for days at a time when they're testing packaging for a new product.

shanezampire:
I had one them old sanders you attached the sandpaper to. The pad was broken and you couldn't attach sandpaper to it no more. I attacked the plastic lid from a jar to it with screws. I put my small engine carburetors and cleaner in the jar, screwed it to the lid, and turn it on for a few hours. It vibrated them very well. It was a Black & Decker Mouse Sander/Polisher/Detailer if you want to see which one I used.

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