The vibration reduction capabilities of a model rotor system utilizing controlled, strain-induced blade twisting are examined. The model rotor blades, which utilize piezoelectric active fiber composite actuators, were tested in the NASA Langley Transonic Dynamics Tunnel using open-loop control to determine the effect of active-twist on rotor vibratory loads. The results of this testing have been encouraging, and have demonstrated that active-twist rotor designs offer the potential for significant load reductions in future helicopter rotor systems. Active twist control was found to use less than 1% of the power necessary to operate the rotor system and had a pronounced effect on both rotating- and fixed-system loads, offering reductions in individual harmonic loads of up to 100%. A review of the vibration reduction results obtained is presented, which includes a limited set of comparisons with results generated using the second-generation version of the Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics (CAMRAD II) rotorcraft comprehensive analysis.


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    Title :

    Further Examination of the Vibratory Loads Reduction Results from the NASA/ARMY/MIT Active Twist Rotor Test


    Contributors:

    Conference:

    58th American Helicopter Society Annual Forum ; 2002 ; Montreal, Canada


    Publication date :

    2002-01-01


    Type of media :

    Preprint


    Type of material :

    No indication


    Language :

    English




    FURTHER EXAMINATION OF THE VIBRATORY LOADS REDUCTION RESULTS FROM THE NASA/ARMY/MIT ACTIVE TWIST ROTOR TEST

    Wilbur, M. L. / Yeager, W. T. / Sekula, M. K. et al. | British Library Conference Proceedings | 2002



    Vibratory loads reduction testing of the NASA/Army/MIT active twist rotor

    Wilbur, M.L. / Mirick, P.H. / Yaeger, W.T. jun. et al. | Tema Archive | 2002