A nonlinear, aeroelastic analysis of a low-aspect delta wing modeled as a plate of constant thickness demonstrates that limit cycle oscillations (LCOs) of the order of the plate thickness are possible. The structural nonlinearity arises from double bending in both the chordwise and the spanwise directions. The results using a vortex lattice aerodynamic model for a low-Mach-number flow complement earlier studies for rectangular wing platforms that showed similar qualitative results. The theoretical results for the flutter boundary (beyond which LCO occurs) have been validated by comparison to the experimental data reported by other investigators for low-aspect-ratio delta wings. Also, the LCOs found experimentally by previous investigators (but not previously quantified prior to the present work) are consistent with the theoretical results reported here. Reduced-order aerodynamic and structural models are used to substantially decrease computational cost with no loss in accuracy. Without the use of reduced-order models, calculations of the LCO would be impractical. A wind-tunnel model is tested to provide a quantitative experimental correlation with the theoretical results for the LCO response itself.


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    Title :

    Limit cycle oscillations of delta wing models in low subsonic flow


    Additional title:

    Aeroelastische Schwingungen von Deltaflügeln in Unterschallströmungen


    Contributors:
    Tang, D. (author) / Henry, J.K. (author) / Dowell, E.H. (author)

    Published in:

    AIAA Journal ; 37 , 11 ; 1355-1362


    Publication date :

    1999


    Size :

    8 Seiten, 15 Bilder, 11 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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