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    New ‘Acoustic Metamaterial’ Cancels Sound

    March 10, 2019, Categories  Physics

    The mathematically designed, 3D-printed acoustic metamaterial is shaped in such a way that it sends incoming sounds back to where they came from, Ghaffarivardavagh and Zhang say. Inside the outer ring, a helical pattern interferes with sounds, blocking them from transmitting through the open center while preserving air’s ability to flow through.
    Credit: Photo by Cydney Scott for Boston University

    Mechanical engineers create synthetic, sound-silencing structure that blocks 94% of sounds. Researchers have demonstrated it’s possible to silence noise using an open, ringlike structure, created to mathematically perfect specifications, for cutting out sounds while maintaining airflow.

    “Today’s sound barriers are literally thick heavy walls,” says Ghaffarivardavagh...

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