This paper demonstrates the use of nonlinear normal modes to predict limit cycle oscillation in a pitch-plunge airfoil with cubically nonlinear pitch stiffness. Aeroelastic systems with quasi-steady and unsteady aerodynamics are analyzed with nonlinear normal modes. An alternative derivation of nonlinear normal modes using first-order form is offered for systems that cannot fit the standard second-order form. The effect of the master coordinate chosen to construct the nonlinear normal modes is examined and found to have a significant impact on the accuracy of the results. Based on the results herein the nonlinear normal mode method is found to be a viable approach to studying and predicting limit cycle oscillation in aeroelastic systems. Furthermore, a master coordinate based on the the linear flutter mode was found to lead to the best results.


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    Titel :

    Predicting Limit Cycle Oscillation in an Aeroelastic System Using Nonlinear Normal Modes


    Beteiligte:

    Erschienen in:

    Journal of Aircraft ; 50 , 1 ; 73-81


    Erscheinungsdatum :

    2013-01-02


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Prediction of Limit Cycle Oscillation in an Aeroelastic System using Asymptotic Nonlinear Normal Modes

    Emory, C. / Patil, M. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2011