Ships – Submersible device – Having propulsion unit
Reexamination Certificate
2009-09-18
2011-10-25
Avila, Stephen (Department: 3617)
Ships
Submersible device
Having propulsion unit
C440S066000
Reexamination Certificate
active
08042483
ABSTRACT:
The invention as disclosed is an apparatus that controls the wake of stator blades on an underwater vehicle. The apparatus comprises one or more stator blades each with a movable trailing edge that when actuated in a controlled manner produces a periodic flapping motion upstream of a propulsion rotor. The controlled periodic flapping of the trailing edge the fills the stator blade wake enough to overcome the stator blade's own drag and fill its wake deficit. This has the effect of reducing the blade rate tonal noise of the propulsion rotor.
REFERENCES:
patent: 4705452 (1987-11-01), Karadimas
patent: 5209438 (1993-05-01), Wygnanski
patent: 6439838 (2002-08-01), Crall et al.
patent: 6827551 (2004-12-01), Duffy et al.
patent: 7150434 (2006-12-01), Bandyopadhyay
patent: 2007/0274823 (2007-11-01), Borchers et al.
patent: 2008/0194155 (2008-08-01), Gaudin
Annaswamy Anuradha
Beal David N.
Huyer Stephen A.
Macumber Daniel L.
Avila Stephen
Kasischke James M.
Nasser Jean-Paul A.
Stanley Michael B.
The United States of America as represented by the Secretary of
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