It is suggested that a preliminary and essential step in the design of flight control systems for highly augmented aircraft is obtaining an accurate open-loop dynamics model. Very large-order open-loop state-space models are constructed from analytical and empirical data obtained from knowledge of the vehicle's aerodynamics, propulsion, and structure dynamics. A balancing methodology for reducing a very large-order state-space representation to a more practical size is discussed. The balancing algorithm has a frequency domain error bound that guarantees the the magnitude of the reduced-order model's frequency response will be bounded. It is suggested that implementing techniques to preserve the number of nonminimum-phase zeros while performing model order reduction, and using residualizaton to match the steady-state magnitude, should improve the time history responses. A 140th-order aeroservoelastic model and a fourth-order critically damped system with an oscillator are considered as examples.


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    Titel :

    Time domain effects of model order reduction


    Weitere Titelangaben:

    Zeitbereichseffekte bei der Reduktion der Modellordnung


    Beteiligte:
    Dudginski, R.J. (Autor:in) / Colgren, R.D. (Autor:in)


    Erscheinungsdatum :

    1989


    Format / Umfang :

    5 Seiten, 12 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch