Matched stiffness rotor flexbeam and blade system

Details Matched stiffness rotor flexbeam and blade system Matched stiffness rotor flexbeam and blade system

1979-12-03

1982-06-01

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Nonmetallic resilient mounting

416141, 416226, B64C 2738

Patent

active

043325254

ABSTRACT:
A flexbeam having matched in-plane and out-of-plane stiffness is described extending at least partway between the tips of a pair of rotor blades bonded thereto. The flexbeam so constituted produces a blade system with a primary in-plane frequency less than the primary forcing frequency. The matched stiffness of the flexbeam is provided by admixing, either compositionally or by laminating, materials of differing flexibilities to produce a high damping material of symmetrical stiffness.

REFERENCES:
patent: 3261407 (1966-07-01), Culver et al.
patent: 3874820 (1975-04-01), Fenaughty
patent: 3880551 (1975-04-01), Kisovec
patent: 3999886 (1976-12-01), Ormiston et al.
patent: 4087203 (1978-05-01), Ferris
patent: 4093400 (1978-06-01), Rybicki
patent: 4244677 (1981-01-01), Noehren et al.
American Helicopter Society, "Ground and Air Resonance Characteristics of a Soft In-Plane Rigid-Rotor System", R. E. Donham et al., pp. 33-41, Feb. 1969.
American Helicopter Society Publication, "Results of Preliminary Studies of a Bearingless Helicopter Rotor Concept", by M. C. Cheney, May 1972.

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