Acoustic cloak from metamaterials

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7 Responses to “Acoustic cloak from metamaterials”

  1. js7a says:

    You can tweak room acoustics with all different kinds of materials in any position you can imagine, but simulation modeling software isn’t good enough yet so it all has to be done by trial and error or a full scale model of the space. Architects can make some educated guesses, but it’s all prayer until the last strip of carpet and upholstered chair is installed. And then, the parade of aggregate subjective score judges begins, with people positioned in seats scattered all over the room at different occupancy levels. If it’s not good enough you guess at something from the simulations with the benefit of knowing where the scores need to improve the most; for example something like a few strips of vinyl or glass across one side of the ceiling, and then you run the subjective scores again. Repeat until the scores are satisfactory or you run out of time, money, or patience. Room acoustics simulation won’t be reliable for a decade, I’d bet, because it’s just too computationally intensive and nobody has accurate enough acoustic model of particular kinds of carpet etc. (and when they do, the carpet manufacturer will arbitrarily change materials or methods enough to make the formerly good models worthless.)

  2. Anonymous says:

    Bats everywhere are trembling at the thought of smashing into invisible bumps on logs.

  3. awjtawjt says:

    “Cummer”?

  4. NuOrder72 says:

    Can one of these be used to cancel out “road noise?” Our backyard backs up to a rather busy road and I would love to bring it down a few decibels.

  5. Vnend says:

    So we are finally getting smart enough to build a Cone of Silence was only 50 something years later? The future is running late.

  6. Anonymous says:

    the thing about metamaterials is that they only work in extremely narrow bands… that is they can make a specific color disappear, or perhaps a single note, but all other frequencies (EM or sound, whatevs) are reflected quite a bit.

    so… cloaking a submarine in this stuff would just force sonar onto a slightly different frequency, where the submarine would then appear nice and bright on the scope.

    • knoxblox says:

      Despite the narrowness of the band, I wouldn’t be surprised if the military isn’t already seeing possibilities for further suppression of noise from guns used in sniper situations.

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