Fluid reaction surfaces (i.e. – impellers) – With weight-balancing means – Self-shifting or selectively adjustable mass
Patent
1996-02-15
1997-07-15
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
With weight-balancing means
Self-shifting or selectively adjustable mass
416500, 188380, B64C 2706
Patent
active
056477260
ABSTRACT:
A vibration absorber having a mass member which when static is supported by in-plane springs spaced apart from a base plate, top plate and spring retaining structures. The mass member has a bumper surface for contacting a motion limiter in the base plate. The mass member, base plate and top plate can have a passageway through the axis. The vibration absorber can be tuned by proper selection of the springs, degree of precompression and the variation of the amount of mass by the addition or removal of mass tuning weights.
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"A Fixed Frequency Rotor Head Vibration Absorber Based Upon G.F.R.P. Springs" by R.W. White, Paper Nr. 69, Fifth European Rotorcraft and Powered Lift Aircraft Forum, Sep. 1979.
Covington Cecil E.
Marshall Bryan W.
Sehgal Ajay
Yuce Mithat
Bell Helicopter Textron Inc.
Look Edward K.
Sgantzos Mark
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