A method to increase the stability of periodic flap-lag dynamics in helicopter rotor blades is investigated. Instability in the flap-lap dynamics of stiff-in-plane rotors can occur as forward flight speed is increased, or if significant pitch-lag coupling is present. A method originally developed to control chaos can be applied to stabilize unstable or weakly stable periodic behavior. Stablization is achieved using small perturbations on the main blade pitch angle. The approach, which will be referred to as periodic active control (PAC) consists of applying discrete control to the Poincare map associated with the nonlinear dynamical system. Control effort is applied efficiently, since is does not change, but only stabilizes underlying periodic motion. Stabilization can lead to higher safe speeds, decreased transient effects, and simplified designs in helicopters.


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    Titel :

    Stabilization of periodic flap-lag dynamics in rotor blades


    Weitere Titelangaben:

    Stabilisierung der Schlagverzögerungsdynamik in Rotorblättern


    Beteiligte:
    Schmitt, J.M. (Autor:in) / Bayly, P.V. (Autor:in) / Peters, D.A. (Autor:in)


    Erscheinungsdatum :

    1995


    Format / Umfang :

    9 Seiten, 9 Bilder, 11 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Stabilization of Periodic Flap-Lag Dynamics in Rotor Blades

    Schmitt, J. M. / Bayly, P. V. / Peters, D. A. et al. | British Library Conference Proceedings | 1995


    Stabilization of Periodic Flap-Lag Dynamics in Rotor Blades

    Schmitt, J. M. / Bayly, P. V. / Peters, D. A. et al. | British Library Conference Proceedings | 1995


    Dynamics of Coupled Flap-Lag Motion by the Helicopter Rotor Blades

    Mikhailov, S. A. / Nikolaev, E. I. / Shilova, N. A. et al. | British Library Conference Proceedings | 2004


    Coupled flap-lag-torsional dynamics of hingeless rotor blades in forward flight

    Friedmann, P. P. / Kottapalli, S. B. R. | NTRS | 1982