The problem of helicopter mechanical instability is considered for the case where one blade damper is inoperative. It is shown that, if the hub is considered to be nonisotropic, the equations of motion have periodic coefficients which cannot be eliminated. However, if the hub is isotropic, the equations can be transformed to a rotating frame of reference and the periodic coefficients eliminated. The Floquet transition matrix method is shown to be an effective way of dealing with the nonisotropic hub and nonisotropic rotor situation. Time history calculations are examined and shown to be inferior to the Floquet technique for determining system stability.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    An application of Floquet theory to prediction of mechanical instability


    Beteiligte:
    Hammond, C. E. (Autor:in)

    Kongress:

    Specialists Meeting on Rotorcraft Dynamics ; 1974 ; Moffett Field, CA


    Erscheinungsdatum :

    01.01.1974


    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :




    Floquet Instability in Periodically Reversing Flows

    Welsh, J. / Peters, D. | British Library Conference Proceedings | 2023



    Fast Floquet Theory and Trim for Multi-Bladed Rotorcraft

    Peters, D. A. / American Helicopter Society | British Library Conference Proceedings | 1995