A recently developed methodoIogy for aircraft structural design, based on nonlinear airloads, is extended to include a modal-based optimization option and is employed with a new cornptutational aerodynamics code for Ioads analysis. Nonlinear maneuver loads are evaluated bv a computational scheme that efficiently combines fluid dynamics iterations with iterations for elastic shape deformations and trim corrections. An efficient design process is obtained by performing several structural optimization runs during one maneuver load analysis, where each optimization is based on the interim nonconverged airloads. To allow for the efficient application of the method with large finite element structural models and many constraints, the discrete-coordinat optimization scheme is replaced by a modal-based optimization where a set of low-frequency vibration modes of the baseline structure is used to represent the structure throughout the optimization, both for response analysis and for sensitivity analysis. Comparative modal-based and discrete-coordinate design cases are shown to converge to the same optimal design variable values, even though they do not follow the same path. Two flow solvers are used, one of which is a newly developed Euler/Navier-Stokes computational aerodynamics code that is capable of handling complex geometries by using the Chimera overset grid method. The method avoids the problem of mesh discontinuities due to elastic shape deformations and control surface deflections because the displacements of each component affect only the component's mesh. The method is demonstrated with a wing-fuselage-elevator transport aircraft model performing symmetric and antisymmetric maneuvers at Mach 0.85.


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    Title :

    Structural optimization using computational aerodynamics


    Additional title:

    Strukturoptimierung mit einem rechnergestützten aerodynamischen Verfahren


    Contributors:
    Raveh, D.E. (author) / Levy, Y. (author) / Karpel, M. (author)

    Published in:

    AIAA Journal ; 38 , 10 ; 1974-1982


    Publication date :

    2000


    Size :

    9 Seiten, 15 Bilder, 2 Tabellen, 36 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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