Mode controlled attachment of rotor mounted components

Details Mode controlled attachment of rotor mounted components Mode controlled attachment of rotor mounted components

1979-04-09

1981-06-30

Jillions, John M.

Fluid reaction surfaces (i.e., impellers)

Combined or convertible

Hub lubrication or seal

416500, 248595, 248638, B64C 700

Patent

active

042759927

ABSTRACT:
An above-rotor mount (30) for a helicopter (10) comprises an upper plate (32) coupled to a lower plate (34) by means of links (42, 44, 46 and 48). The lower plate (34) is connected to a rotating rotor shaft (16) and a non-rotating stand pipe (40) extending inside the rotor shaft. The links (42, 44, 46 and 48) are focused to control the mode shapes and dynamic response of the mounted components at a preselected frequency, such as the predominant rotor harmonic. Springs (50, 52) are connected between the plates (32, 34) for damping.

REFERENCES:
patent: 3163378 (1964-12-01), Balke et al.
patent: 3698663 (1972-10-01), Balke et al.
patent: 3845917 (1974-11-01), Drees
patent: 3858831 (1975-01-01), Halwes
patent: 3896446 (1975-07-01), Kondoh et al.
patent: 4088042 (1978-05-01), Des Jardins et al.
patent: 4111386 (1978-09-01), Kenigsberg

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