The presented technique addresses the problem of maintaining the powerful design simplicity and visibility of eigenstructure assignment, while reducing closed-loop eigenstructure sensitivity to dominant parameter variations. The method results from consideration of the allowable eigenvector subspace as a complete description of the eigenstructure assignment problem. Variations in open-loop system dynamics can thus be visualised as movements of the closed-loop allowable subspace. If a nonlinear model is linearised about two operating points with intersecting subspaces, assignment from the intersection will yield the same closed-loop eigenstructure at both operating points. This hypothesis is proven, and the analysis extended to include the case of non-intersecting subspaces. This reduced subspace design method has been tested on an eighth-order helicopter model that exhibits significant nonlinearity when forward speed is varied. The results demonstrate a considerable reduction in variation of the closed-loop eigenstructure over conventional techniques.


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    Title :

    Assignment of reduced sensitivity eigenstructure


    Contributors:
    Ensor, J. (author) / Davies, R. (author)

    Published in:

    Publication date :

    2000


    Size :

    7 Seiten, 22 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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