Survivability of an aircraft in combat is achieved by not getting hit or by withstanding the effects of some suffered hits. To assess the latter aspect of survivability of a given military aircraft, live-fire tests are performed on its wings. The currently practiced loading methodology does not reproduce the loads encountered during flight, and does not account for the changes in structural stiffness and mass of the wing after damage infliction. This paper presents a concept for an alternative loading methodology that resolves these issues by exploiting recent advances in nonlinear aeroelastic simulations and smart material actuators. The main idea behind this concept is to accurately predict the stress states of the aircraft before, during, and after sustaining a hit, for a given flight condition, and reproduce them on the ground by instrumenting the spars and ribs of the wings with programmable actuators and possibly a few external tethers. Mathematically, this entails the solution of an optimization problem to determine the locations and gains of the actuators. The potential of this concept is evaluated for the ARW-2 aeroelastic wing and a transonic flight condition. The obtained numerical results suggest that the proposed loading methodology can reproduce a desired stress state fairly accurately with an acceptable number of actuators and a reasonable amount of external energy.


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    Title :

    A stress-control-based live-fire ground testing methodology


    Contributors:
    Bou-Mosleh, C. (author) / Farhat, C. (author) / Maute, K. (author)


    Publication date :

    2004


    Size :

    7 Seiten, 11 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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