Results are presented from an experimental investigation of the microdynamics of deployable space structures. The dynamic response of a representative deployable truss at submicrostrain levels of vibration was characterized in terms of modal parameters. The test article was subjected to stepped-sine sweeps through its fundamental flexible modes over a range of excitation amplitudes. High-sensitivity piezoceramic strain sensors were used in conjunction with a lock-in amplifier to measure the truss response from tens of microstrain down to one nanostrain. The results show that the values of modal frequency and damping ratio are strain dependent at high response amplitudes and strain independent at low amplitudes. lt is inferred that, at microdynamic levels of excitation, the internal loads needed to overcome the joint friction are not attained. The nonlinear mechanisms in the deployable structure are, thus, not activated, resulting in a linear truss response.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Microdynamic characterization of modal parameters for a deployable space structure


    Weitere Titelangaben:

    Die mikrodynamische Charakterisierung der Modalparameter einer entfaltbaren Weltraumstruktur


    Beteiligte:
    Ingham, M.D. (Autor:in) / Crawley, E.F. (Autor:in)

    Erschienen in:

    AIAA Journal ; 39 , 2 ; 331-338


    Erscheinungsdatum :

    2001


    Format / Umfang :

    8 Seiten, 18 Bilder, 11 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Microdynamic Characterization of Modal Parameters for Deployable Space Structures

    Ingham, M. D. / Crawley, E. F. / International Astronomical Federation | British Library Conference Proceedings | 1998




    Microdynamic Design Requirements for Large Space Structures

    Peterson, Lee / Hinkle, Jason | AIAA | 2003


    Space Environment Simulation Compliant with Microdynamic Measurement

    Meurat, A. / Louit, A. / International Astronautical Federation | British Library Conference Proceedings | 1995