Acoustic device
Provided acoustic devices include an external housing defining an expansion chamber and a wall extending through and partitioning the expansion chamber into a central chamber and a peripheral chamber adjacent the central chamber, wherein an inlet and outlet communicate with the central chamber, and wherein the wall includes a plurality of apertures formed therethrough to allow air movement to and from the central and expansion chambers, the plurality of apertures sized to provide an average flow resistance ranging from 100 MKS Rayls to 5000 MKS Rayls. The acoustic devices advantageously show significant sound attenuation while streamlining air flow to reduce pressure drop across the expansion chamber.
3M Innovative Properties Company
F F F F G F F F F F F
F01N F02M F24F F01N G10K F01N F01N F02M F01N F24F F01N
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Paul A. Seungkyu Thomas P. Ronald W. John Stuart Jonathan H. Thomas
Martinson Lee Hanschen Gerdes Bolton Alexander Herdtle