Development of a large modal survey test fixture for measuring constrained-boundary modes and frequencies of space station modules and other shuttle payloads is described. Problems with fixture-to-test article interface mechanisms and the adverse effects on modal data are discussed, as well as redesign of the mechanisms. In view of the difficulties experienced in fixture development and fixed-base testing, alternative free-suspension techniques are discussed for deriving constrained vibration mode shapes for space shuttle payloads using unconstrained or free-boundary dynamic properties. These methods are the residual flexibility method, which requires measurement of a set of free-boundary modes plus the residual flexibility of the payload-to-orbiter interfaces, and the mass-additive approach, which involves the measurement of unconstrained modes of a payload with large masses attached to the interfaces.


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    Title :

    Modal vibration test facilities and methods for space station modules


    Additional title:

    Ausrüstungen und Verfahren für Modalschwingungsprüfungen zum Einsatz in Modulen von Weltraumstationen


    Contributors:


    Publication date :

    1995


    Size :

    8 Seiten, 15 Bilder, 2 Tabellen, 14 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Modal Vibration Test Facilities and Methods for Space Station Modules

    Tinker, M. / American Institute of Aeronautics and Astronautics| ASME| ASCE | British Library Conference Proceedings | 1995


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    Telescoping Space-Station Modules

    Witcofski, R. D. | NTRS | 1986


    Telescoping space station modules

    Witcofski, R. D. | NTRS | 1984