A two-dimensional flexible airfoil with a free play non-linearity in pitch has been analyzed in the subsonic flow range. Structurally, the airfoil is modelled as finite beam elements and two spring elements in pitch and plunge. A doublet lattice method is used for the two-dimensional unsteady aerodynamics to include th camber deflection effect. The fictitious mass modal approach is adopted in order to use the consistent modal co-ordinate for the structures with non-linearity. Non-linear aeroelastic analyses for both the frequency domain and time domain are performed for rigid and flexible airfoil models to investigate the flexibility effect. Results are shown for models of different pitch-to-plunge frequency ratio. Responses involving limit cycle oscillation and chaotic motion are observed and they are highly influenced by the pitch-to-plunge frequency ratio.


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    Title :

    Aeroelastic analysis of a flexible airfoil with a freeplay non-linearity


    Additional title:

    Aeroelastische Analyse von biegsamen Tragflügeln mit einem nichtlinearen Spielraum


    Contributors:
    Kim, S.H. (author) / Lee, I. (author)

    Published in:

    Publication date :

    1996


    Size :

    24 Seiten, 19 Bilder, 21 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English