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3D printed spiral sound killer
3D printed spiral sound killer
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Old 13th March 2019, 12:02 AM   #1
Pano is offline Pano  United States
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3D printed spiral sound killer
Default 3D printed spiral sound killer

This looks rather intriguing. The linked article is poorly written, but the idea is cool.
I've requested a copy of the paper, would like to know in more detail what they've done. Looks like nested spirals.

BU researchers develop 'acoustic metamaterial' that cancels sound | EurekAlert! Science News
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Old 13th March 2019, 12:40 AM   #2
avincenty is offline avincenty  United States
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I can imagine a custom fitted 3D printed unit on the back of a dipole OB driver magnet to make it cardioid. Kind of a shallow lxmini top driver.
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Old 13th March 2019, 02:08 PM   #3
turk 182 is offline turk 182  Canada
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my wife say's she wants one made like a muzzle....what's up with tha....wait a second!

cool article
if this stuff works in strips...what that could do to resolve diffraction issues... we could go back to square box construction...no more round over worries!

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Old 13th March 2019, 02:29 PM   #4
Godzilla is offline Godzilla  United States
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Default Noise cancelling 'shape'

I was curious about this technology after reading the article but after watching the short video I wondered if all that's happening here is the tuning of the port... Can someone explain what's happening here?

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Old 14th March 2019, 09:31 AM   #5
chris661 is offline chris661  United Kingdom
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Difficult to say exactly what's happening without seeing photos of the prototype.

Even then, they've managed to block most of the sound coming out of a plane wave tube. It's a start, but transferring that to large-scale deployment will be a hideous challenge.


I suspect a Helmholtz resonator also blocks a lot of sound. A rubber bung in the end of the tube would do very well.

I'd like to see attenuation vs frequency of their plane wave tube.

Chris
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Old 15th March 2019, 09:34 AM   #6
Bicicletta is offline Bicicletta  Europe
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Yes, it seems tuned around 480Hz.
Maybe nested damped pipes resonant at 1/4 wavelength (17cm).
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Old 15th March 2019, 11:59 PM   #7
martin clark is offline martin clark  Europe
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An application of Helmholtz resonation.
Not broadband-applicable.

Old news, except the implementation - which might be useful yet.
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Old 20th March 2019, 01:20 AM   #8
Pano is offline Pano  United States
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3D printed spiral sound killer
I have not heard from the authors. I requested a copy of the paper, but no luck.
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