System identification methodology is developed for a linear time-periodic (LTP) system and applied to an experimental setup of an integrally twist-actuated helicopter rotor blade. Identification is conducted for a controller design, which alleviates vibratory loads induced in forward flight. Since a rotor in forward flight is a time-periodic system due to the aerodynamic environment varying once per rotation, the adopted methodology requires determination of the multicomponent harmonic transfer functions. A simplified identification formula is also derived for a linear time-invariant (LTI) system, such as a rotor system in hover. The latter approach gives another estimate of the primary component among the harmonic transfer functions. The identification experiment is conducted at NASA Langley Transonic Dynamics Tunnel. The magnitude of the higher-order harmonic transfer functions is observed to be small in the frequency range of interest when compared with that of the primary component. This indicates that the present active rotor system may be regarded as a LTI system under the level flight conditions considered. Results obtained in system identification are interpreted in terms of the closed-loop controller design.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    System identification technique for active helicopter rotors


    Contributors:

    Published in:

    Publication date :

    2005


    Size :

    14 Seiten, 22 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Jet-propelled helicopter rotors

    Klemin, A. | Engineering Index Backfile | 1949


    MECHANICAL SYSTEM OF HELICOPTER ROTORS BRAKING SYSTEM

    KALININ YAROSLAV VLADIMIROVICH / NIKONCHUK NATALYA VIKTOROVNA / PLUSHCHEVSKIJ ALEKSEJ MIKHAJLOVICH et al. | European Patent Office | 2020

    Free access

    Unsteady Aerodynamics of Helicopter Rotors

    W. P. Jones / W. J. McCroskey / J. J. Costes | NTIS | 1972


    Unsteady aerodynamics of helicopter rotors

    Jones, W. P. / McCroskey, W. J. / Costes, J. J. | TIBKAT | 1972


    NEW GENERATION OF HELICOPTER ROTORS

    Szumanski, K. / Szumanski, A. / Polskie Stowarzyszenie Wiroplatowe | British Library Conference Proceedings | 2000