Generating vertical vibrations

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    Vertical Vibrations
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Devices that generate vertical vibrations with variable amplitude and frequency can be challenging to find. Pneumatic systems using pressurized inner tubes are a cost-effective option, though they may introduce compression artifacts in the waveform. A counter-rotating eccentric mass exciter is recommended as a simple and effective solution for achieving the desired vibrations. This device is easy to construct and operate, making it suitable for vibrating containers filled with sand. Overall, these suggestions provide practical approaches to generating the required vertical vibrations.
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Homework Statement



anyone have any suggestions for devices which generate vertical vibrations, preferably of variable amplitude (say, up to a cm or so) and of variable frequency (around 10hz) which can be used to vibrate a container full of, say, sand?

Homework Equations



umm...

The Attempt at a Solution



uhh...
 
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This could be tough depending on how much sand you are quaking. May I suggest using pneumatics to pressurize something like innertubes? The problem is that the waveform would be full of compression/ pressurization artifacts, the advantage is that its pretty cheap.
 
My sugestion: a counter rotating eccentric mass exciter. It is very easy to build and operate, and it will do the job as you want.
 

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