Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Lead-lag type rotor blade movement
Reexamination Certificate
2005-08-09
2005-08-09
Verdier, Christopher (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
Lead-lag type rotor blade movement
C416S140000, C416S500000, C188S267100, C188S312000, C188S316000, C188S318000
Reexamination Certificate
active
06926500
ABSTRACT:
A drag damper for use on a rotary-wing aircraft rotor comprises a body defining two variable volume chambers linked by a piston. The chambers filled with fluid in the damper are connected by a restrictor port in the piston or between the latter and the body, and via a channel of great length and small cross-section compared with the cross-section of the body, in which elastic means bear against and load the piston-rod assembly towards a neutral position, the anti-resonance frequency of the damper being matched substantially to the nominal rotation frequency of the rotor, and the restrictor port providing effective damping at the natural frequency (ωδ) of the blades in drag, differing by construction from the rotor frequency (Ω).
REFERENCES:
patent: 2667237 (1954-01-01), Rabinow
patent: 2820471 (1958-01-01), Crowell
patent: 3212584 (1965-10-01), Young
patent: 3638885 (1972-02-01), Reed
patent: 3972396 (1976-08-01), Bochnak
patent: 4084668 (1978-04-01), Rybicki
patent: 4105365 (1978-08-01), Ferris et al.
patent: 4304525 (1981-12-01), Mouille
patent: 4407633 (1983-10-01), Mouille
patent: 4556365 (1985-12-01), Mouille et al.
patent: 4695226 (1987-09-01), Marchitto et al.
patent: 4732540 (1988-03-01), Mouille et al.
patent: 5337864 (1994-08-01), Sjoestroem
patent: 5732905 (1998-03-01), Krysinski
patent: 6676074 (2004-01-01), Zoppitelli et al.
patent: 0 183 039 (1986-06-01), None
patent: 1 130 280 (2001-09-01), None
patent: 2 737 271 (1997-01-01), None
patent: 1 333 246 (1973-10-01), None
patent: 2 111 171 (1983-06-01), None
Eurocopter
Sturm & Fix LLP
Verdier Christopher
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