A method is presented for generating mode shapes for model order reduction in a way that leads to accurate calculation of eigenvalue derivatives and eigenvalues for a class of control augmented structures. The method is based on treating degrees of freedom where control forces act or masses are changed in a manner analogous to that used for boundary degrees of freedom in component mode synthesis. It is especially suited for structures controlled by a small number of actuators and/or tuned by a small number of concentrated masses whose positions are predetermined. A control augmented multispan beam with closely spaced natural frequencies is used for numerical experimentation. A comparison with reduced-order eigenvalue sensitivity calculations based on the normal modes of the structure shows that the method presented produces significant improvements in accuracy.


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    Title :

    Accurate calculation of control-augmented structural eigenvalue sensitivities using reduced-order models


    Contributors:
    Livne, Eli (author)

    Published in:

    Publication date :

    1989-07-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English





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