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Sleeping pod design
Old 4 weeks ago
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theragingwalrus's Avatar
 

Lightbulb Sleeping pod design

From very early in the morning, fork lifts with trailers: (Image is here, I'm not yet allowed to use tags: https://i.imgur.com/ETCvSki.jpg )
are moving all kinds of stuff in front of my window. When they go over bumps, whatever they're carrying bounces around on the trailer and creates a loud sound. I have yet to record it with a good mic and plot the spectrum of it but to my ear it sounds mostly like mid/high-frequency. Despite wearing earplugs it wakes me up early and I'm planning on doing something about it.

For this reason I'm considering building a sleeping pod. It will have a wooden frame, isolated from the ground on old car tires (or something else, any suggestions?), and screwed on the wooden frame is a drywall/green glue/drywall assembly.

I've started the design, viewable here: https://cad.onshape.com/documents/0a...5def6aee322532

I have yet to add a door and a quiet ventilation system (Aeropac) to the design but the basics are there.

This will isolate sound waves according to the 'mass law', see here: https://www.engineeringtoolbox.com/s...ls-d_1409.html
One panel is 9.5kg/m2, two is ~20kg/m2, so a value of 30dB isolation (at 500 Hz). At 63 Hz this is 30 - 13 = 17 dB isolation which is already quite good, and of course it gets even better at high frequencies. Cost should be < €1000.

Does anyone have feedback for the design?
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