The launch vehicle dynamics affected by bending and sloshing modes are considered. Attitude measurement data that are corrupted by flexible modes could yield instability of the vehicle dynamics. Flexible body and sloshing modes are reconstructed by sliding mode observers. The resultant estimates are used to remove the undesirable dynamics from the measurements, and the direct effects of sloshing and bending modes on the launch vehicle are compensated by means of a controller that is designed without taking the bending and sloshing modes into account. A linearized mathematical model of Ares I launch vehicle was derived based on FRACTAL, a linear model developed by NASA/MSFC. The compensated vehicle dynamics with a simple PID controller were studied for the launch vehicle model that included two bending modes, two slosh modes and actuator dynamics. A simulation study demonstrated stable and accurate performance of the flight control system with the augmented simple PID controller without the use of traditional linear bending filters.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Flexible Modes Control Using Sliding Mode Observers: Application to Ares I


    Beteiligte:
    Y. B. Shtessel (Autor:in) / C. E. Hall (Autor:in) / S. Baev (Autor:in) / J. S. Orr (Autor:in)

    Erscheinungsdatum :

    2010


    Format / Umfang :

    22 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Flexible Modes Control Using Sliding Mode Observers: Application to Ares I

    Shtessel, Yuri B. / Hall, Charles E. / Baev, Simon et al. | NTRS | 2010


    Flexible Modes Control Using Sliding Mode Observers: Application to Ares I

    Shtessel, Yuri / Hall, Charles / Baev, Simon et al. | AIAA | 2010


    Active Compensation of Low Frequency Flexible Modes of Crew Launch Vehicle Using Sliding Mode Observers

    Shtessel, Y. / Baev, S. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2008