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    • Fan noise reduction from turbofan engines using adaptive Herschel-Quincke tubes 

      Virginia Tech Intellectual Properties, Inc.; Burdisso, Ricardo A.; Smith, Jerome Peter (United States Patent and Trademark Office, 2000-09-05)
      An array of adaptive or fixed Herschel-Quincke tubes aligned in a circumferential or helical array about an inlet of a turbofan engine. The array of tubes effectively divide the acoustic energy generated by the engine. One ...