Acoustic device
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United States of America Patent
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Jul 16, 2019
Grant Date -
Aug 24, 2017
app pub date -
Sep 9, 2015
filing date -
Sep 9, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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.
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