This paper presents an analytical-experimental study of using magnetostrictive actuators in conjunction with an extension-torsion coupled composite tube to actuate a rotor blade trailing-edge flap to actively control helicopter vibration. Thin-walled beam analysis based on Vlasov theory was used to predict the induced twist and extension in a composite tube with magnetostrictive actuation. To validate the analysis, extension-torsion coupled Kevlar-epoxy tubes of different ply lay-ups were fabricated using an autoclave molding technique. These tubes were first tested under static mechanical loads, and tip twist and axial extension were measured by means of a laser optical system and strain gages, respectively. Good correlation between theory and experiment was achieved. Subsequently, these composite tubes were tested under magnetostrictive actuation. The Kevlar-epoxy tube system generated the maximum twist, 0.19 deg in tension and 0.20 deg in compression. The Kevlar-epoxy system showed good correlation between measured and predicted twist values. Finally, alternate actuator concepts for these tubes, specifically piezoelectric stacks and electrostrictive actuators, were examined, and a piezoelectric stack actuator was found to induce much larger force and twist (approximately 3 times that created by the magnetostrictive actuator/tube system).


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Torsional actuation with extension-torsion composite coupling and a magnetostrictive actuator


    Additional title:

    Torsions-Verstellung eines Rotorblatts mittels eines Verbundstoffrohrs mit gekoppelter Dehnung und Torsion und mittels eines magnetostriktiven Aktors


    Contributors:
    Bothwell, C.M. (author) / Chandra, R. (author) / Chopra, I. (author)

    Published in:

    AIAA Journal ; 33 , 4 ; 723-729


    Publication date :

    1995


    Size :

    7 Seiten, 19 Bilder, 13 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Torsional actuation with extension-torsion composite coupling and a magnetostrictive actuator

    Bothwell, Christopher M. / Chandra, Ramesh / Chopra, Inderjit | AIAA | 1995



    Torsional actuation with extension-torsion composite coupling and magnetostrictive actuators

    Bothwell, Christopher / Chandra, Ramesh / Chopra, Inderjit | AIAA | 1994


    Torsional Actuation with Extension - Torsion Composite Coupling and Magnetorestrictive Actuators

    Bothwell, C. / Chandra, R. / Chopra, I. et al. | British Library Conference Proceedings | 1994