A nonlinear aeroelastic analysis has been presented. The aeroelastic analysis uses a geometrically exact structural theory and a nonplanar, fixed-wake aerodynamic theory. The aeroelastic analysis methodology also consistently models the fluid-structure interface. The results presented shed light on the importance of various types of geometrical nonlinearities on the aeroelastic behavior of high-aspect-ratio wings. It is seen that there is negligible difference between the airloads calculated using the correct nonplanar wing geometry as compared to loads calculated assuming a planar wing. The nonplanar modelling of the wing is not essential even for high wing deflection. In fact, even the 3-D effects are quite small for the high-aspectratio wing considered. More research using a free-wake aerodynamic model is required to accurately judge the 3-D nonplanar aerodynamic effects, especially for large amplitude oscillations. The structural nonlinear effects were quite small for the steady state calculations. On the other hand, the dynamic properties of the structure undergo significant change with wing deformation. The curved wing structural dynamic frequencies are quite different from those of the straight wing. The dependence of the structural dynamic properties on the wing deformation is the dominant nonlinearity for long slender wings. Such changes in the frequencies and modeshapes of the system leads to a significant change in the dynamic aeroelastic behavior of the wing. The flutter speed of the system can change by more than 50 % for large deflections. Finally, it should also be noted that the geometrically exact calculation of the angle of attack and proper application of the airloads are also necessary for correct prediction of aeroelastic response. These effects were termed as interface nonlinearities in the present paper. Some researchers may instead group parts of these nonlinearities in the structural and/or aerodynamic models, possibly leading to conclusions different from those given above.


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    Title :

    On the importance of aerodynamic and structural geometrical nonlinearities in aeroelastic behavior of high-aspect-ratio wings


    Additional title:

    Zur Bedeutung aerodynamischer und strukturmechanischer Nichtlinearitäten beim aeroelastischen Verhalten von Tragflügeln mit großer Streckung


    Contributors:
    Patil, M.J. (author) / Hodges, D.H. (author)

    Published in:

    Publication date :

    2004


    Size :

    11 Seiten, 5 Bilder, 2 Tabellen, 12 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    On the Importance of Aerodynamic and Structural Geometric Nonlinearities on Aeroelastic Behavior of High-Aspect-Ratio Wings

    Hodges, D. / Patil, M. / American Institute of Aeronautics and Astronautics et al. | British Library Conference Proceedings | 2000


    Characterizing the Effects of Geometrical Nonlinearities on Aeroelastic Behavior of High-Aspect Ratio Wings

    Patil, M. J. / Hodges, D. H. / Cesnik, C. E. S. et al. | British Library Conference Proceedings | 1999



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