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Thread: Shape that blocks sound

  1. #1

    Shape that blocks sound

    Scientists have discovered a shape that blocks all sound–even your co-workers

    A team of Boston University researchers recently stuck a loudspeaker into one end of a PVC pipe. They cranked it up loud. What did they hear? Nothing.

    How was this possible? Did they block the other end of the pipe with noise canceling foams or a chunk of concrete? No, nothing of the sort. The pipe was actually left open save for a small, 3D-printed ring placed around the rim. That ring cut 94% of the sound blasting from the speaker, enough to make it inaudible to the human ear.



    Dubbed an “acoustic meta-material,” the ring was printed from a mathematically modeled design, shaped in such a way that it can catch certain frequencies passing through the air and reflect them back toward their source. Typical acoustic paneling works differently, absorbing sound and turning the vibrations into heat. But what’s particularly trippy is that this muffler is completely open. Air and light can travel through it–just sound cannot.
    More here: https://www.fastcompany.com/90316833...our-co-workers
    Geraniums stink.

  2. #2
    Eh. That’s say we do and don’t.

  3. #3
    Quote Originally Posted by PTA! View Post
    Eh. That’s say we do and don’t.
    What?
    Geraniums stink.

  4. #4
    Quote Originally Posted by Helena View Post
    What?
    Let’s say we do and don’t.

    Sorry, typo.

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  6. #6
    Tech wise, it’s impressive.

    Reality wise, it would increase crime.

  7. #7

  8. #8
    Quote Originally Posted by PTA! View Post
    Tech wise, it’s impressive.

    Reality wise, it would increase crime.
    Yeah, you’re definitely PTA.

  9. #9

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