This paper summarizes work performed under a collaborative research effort between the National Aeronautics and Space Administration (NASA) and the German Aerospace Research Establishment (DLR, Deutsche Forschungsanstalt fur Luft- und Raumfahrt). The objective is to develop and demonstrate system identification technology for future large space structures. Recent experiences using the Eigensystem Realization Algorithm (ERA), for modal identification of Mini-Mast, are reported. Mini-Mast is a 20 m long deployable space truss used for structural dynamics and active vibration-control research at the Langley Research Center. A comprehensive analysis of 306 frequency response functions (3 excitation forces and 102 displacement responses) was performed. Emphasis is placed on two topics of current research: (1) gaining an improved understanding of ERA performance characteristics (theory vs. practice); and (2) developing reliable techniques to improve identification results for complex experimental data. Because of nonlinearities and numerous local modes, modal identification of Mini-Mast proved to be surprisingly difficult. Methods were available, ERA, for obtaining detailed, high-confidence results.


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    Titel :

    Eigensystem Realization Algorithm Modal Identification Experiences with Mini-Mast


    Beteiligte:
    R. S. Pappa (Autor:in) / A. Schenk (Autor:in) / C. Noll (Autor:in)

    Erscheinungsdatum :

    1992


    Format / Umfang :

    43 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch