Ducted axial fan

Details Ducted axial fan Ducted axial fan

1994-10-11

1996-06-11

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

415119, G10K 1116

Patent

active

055264328

ABSTRACT:
A ducted axial fan for large diameter ducts (11) which includes equidistantly spaced sensors (22,23) upstream and downstream of an axial fan and spaced actuators (24, 26) located around the periphery of said duct to cancel tonal noise caused by the air turbulence generated by the rotation of the fan.

REFERENCES:
patent: 4044203 (1977-08-01), Swinbanks
patent: 4153815 (1979-05-01), Chaplin et al.
patent: 4715559 (1987-12-01), Fuller
patent: 5141391 (1992-08-01), Acton et al.

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