The results of a joint NASA/Army/Bell Helicopter Textron wind-tunnel test to assess the potential of higher harmonic control (HHC) for reducing vibrations in tiltrotor aircraft operating in the airplane mode of flight, and to evaluate the effectiveness of a Bell-developed HHC algorithm called MAVSS (Multipoint Adaptive Vibration Suppression System) are presented. The test was conducted in the Langley Transonic Dynamics Tunnel using an unpowered 1/5- scale semispan aeroelastic model of the V-22 which was modified to incorporate an HHC system employing both the rotor swashplate and the wing flaperon. The effectiveness of the swashplate and the flaperon acting either singly or in combination in reducing 1P and 3P wing vibrations over a wide range of tunnel airspeeds and rotor rotational speeds was demonstrated. The MAVSS algorithm was found to be robust to variations in tunnel airspeed and rotor speed, requiring only occasion-al on-line recalculations of the system transfer matrix.


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    Title :

    Higher Harmonic Control for Tiltrotor Vibration Reduction


    Contributors:

    Publication date :

    1997-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Tiltrotor Vibration Reduction Through Higher Harmonic Control

    M. W. Nixon / R. G. Kvaternik / T. B. Settle | NTIS | 1997


    Tiltrotor Vibration Reduction Through Higher Harmonic Control

    Nixon, Mark W. / Kvaternik, Raymond G. / Settle, T. Ben | NTRS | 1997


    Higher Harmonic Control for Tiltrotor Vibration Reduction

    M. W. Nixon / R. G. Kvaternik / T. B. Settle | NTIS | 2004



    Tiltrotor vibration reduction through higher harmonic control

    Nixon, M.W. / Kvaternik, R.G. / Settle, T.B. | Tema Archive | 1997