The control of large flexible systems is an area of growing concern for control engineers. In particular, the robustness of any control design for a flexible structure is of great interest because of the inexact knowledge of the structure, the necessity of model truncation in the control design or the variability of the structure itself. Numerous techniques have been offered as solutions for one or more of the above problems but little applications have been produced. The method of Active Modal Damping has been presented and discussed as a practical method for such systems. This present paper reviews the method of Active Modal Damping and presents as an example the newly re-designed Pinhole/Occulter Facility. The system under discussion is a large space system comprised of a flexible beam (30 meters long by .3 meters wide), a gimbal pointing system and an optical alignment system. The facility is mounted in the Shuttle cargo bay and excited by the typical shuttle disturbances. The flexible modes are assumed known but only to within about 10 %. A controller was designed for the nominal case and the effects of the variations of the modal frequencies and modal damping factors on the system performance were studied.


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    Title :

    On the robustness of active modal damping of flexible space systems


    Additional title:

    Ueber die Staerken der aktiven modalen Daempfung bei flexiblen Weltraumsystemen


    Contributors:
    Greene, M. (author)


    Publication date :

    1986


    Size :

    4 Seiten, 7 Bilder, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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