This technical report describes two truss experiments flown on the NASA KC-135 Reduced Gravity Aircraft. The purpose of these experiments was to investigate large space structure dynamics, ground test methods, and passive and active damping. A 2-meter truss was first flown to determine the rigid body dynamics in the aircraft during zero-gravity. The second flight's objective was to measure structural modes of a 12-meter truss, which represented a space structure component. Typically five to ten seconds of zero gravity data were recorded for each parabolic arc. Flight test results are compared with ground testing in which a low restraint spring mechanism was used to suspend the truss. Good correlation between ground and flight test results was achieved; the major differences were caused by suspension system friction, which coupled the frame modes with the bending and torsion modes.


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    Title :

    Space Truss Zero Gravity Dynamics


    Contributors:
    A. D. Swanson (author) / W. Yuen (author) / J. R. Mackaman (author)

    Publication date :

    1993


    Size :

    49 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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