Owl-inspired wing design reduces wind turbine noise by 10 decibels

Many species of owl are able to hunt in effective silence by suppressing their noise at sound frequencies above 1.6 kilohertz (kHz) - over the range that can be heard by humans. A team of researchers studying the acoustics of owl flight is working to pinpoint the mechanisms that accomplish this virtual silence to improve man-made aerodynamic design -- of wind turbines, aircraft, naval ships and, even, automobiles.

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