Sound absorber having helical fixtures
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United States of America Patent
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Nov 20, 2012
Grant Date -
Dec 22, 2011
app pub date -
Aug 5, 2011
filing date -
Feb 5, 2009
priority date (Note) -
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Abstract
A sound absorber comprises an elongated gas channel, through which a flowing gas passes in operation of the sound absorber; and at least one helical fixture mounted in a longitudinal section of the gas channel. The helical fixture defines a helical gas passage through the longitudinal section of the gas channel. Further, the helical fixture defines at least one longitudinal Helmholtz resonator within the gas channel which is excited by sound waves propagating in the flowing gas passing through the at least one gas channel.
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