Archived New sound absorption method cancels out 99.7 percent of all sound (digitaltrends.com)
submitted ago by CVravenRaven76
Posted by: CVravenRaven76
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Archived on: 2/12/2017 1:51:00 AM
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Archived New sound absorption method cancels out 99.7 percent of all sound (digitaltrends.com)
submitted ago by CVravenRaven76
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[–] Caboose_Calloway ago
Ok, this is interesting but purely theoretical.
Here is the scientific article.
The writing style is terrible and almost deliberately confusing. Trying to unpick it and get to the thing they have done takes time.
So it seems they are stretching membranes (read as baloon skins) around a frame and sticking a weight at the center. Then they take two of these with carefully calculated proportions and place them back to back with a very specific air gap in between. Lots of maths and a few other minor details determine the overall dimensions of the whole thing.
In their computer simulations this seems to cancel out almost all sound waves. Only simulation though, this hasn't been verified in practice yet.