F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
F04D 29/66 (2006.01) F01P 11/10 (2006.01)
Patent
CA 2593382
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.
Berry Alain
Gerard Anthony
Gervais Yvon
Masson Patrice
Centre National de La Recherche Scientifique
Osler Hoskin & Harcourt Llp
Socpra-Sciences Et Genie S.e.c.
Universite de Poitiers
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