METHOD AND APPARATUS FOR CONTROLLING TONAL NOISE FROM SUBSONIC AXIAL FANS
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United States of America Patent
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Issued Date -
Jan 10, 2008
app pub date -
Jun 27, 2007
filing date -
Jun 27, 2006
priority date (Note) -
Abandoned
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Abstract
A method and apparatus for reducing a selected tonal noise generated by an axial flow fan operating in a non-uniform flow by locating at least one obstruction in the non-uniform flow such that the at least one obstruction generates a noise that is out of phase with the selected tonal noise. The noise generated by the at least one obstruction interferes with the selected tonal noise, thus reducing the selected tonal noise. It is also contemplated to use additional obstructions to reduce other tonal noises generated by the axial flow fan.
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