The air and ground resonance instabilities of hingeless rotor helicopters are examined on a relatively broad parametric basis including the effects of blade tuning, virtual hinge locations, and blade hysteresis damping, as well as size and scale effects in the gross weight range from 5,000 to 48,000 pounds. A special case of a 72,000 pound helicopter air resonance instability is also included. The study shows that nominal to moderate and readily achieved levels of blade inertial hysteresis damping in conjunction with a variety of tuning and/or feedback conditions are highly effective in dealing with these instabilities. Tip weights and reductions in pre-coning angles are also shown to be effective means for improving the air resonance instability.


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    Title :

    Open and Closed Loop Stability of Hingeless Rotor Helicopter Air and Ground Resonance


    Contributors:


    Publication date :

    1974-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Open and closed loop stability of hingeless rotor helicopter air and ground resonance

    Young, M. / Bailey, D. / Murray, S. | Tema Archive | 1974


    Open and Closed Loop Stability of Hingeless Rotor Helicopter Air and Ground Resonance

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    Stability and control of hingeless rotor helicopter ground resonance

    Young, M.I. / Bailey, D.J. | Tema Archive | 1974


    Stability and Control of Hingeless Rotor Helicopter Ground Resonance

    Maurice I. Young / David J. Bailey | AIAA | 1974


    New design of hingeless helicopter rotor improves stability

    Ormiston, R. A. / Bousman, W. G. / Hodges, D. H. et al. | NTRS | 1975