An atmospheric flight vehicle in hover is typically controlled by varying its thrust vector. Achieving both levitation and attitude control with the propulsion system places considerable demands on it for agility and precision, particularly if the vehicle is statically unstable, or nearly so. These demands can be relaxed by introducing an appropriately sized angular momentum bias aligned with the vehicle's yaw axis, thus providing an additional margin of attitude stability about the roll and pitch axes. This paper describes a methodical approach for trading off angular momentum bias level needed with desired levels of vehicle response due to the design disturbance environment given a vehicle's physical parameters. It also describes several simplifications that provide a more physical and intuitive understanding of dual-spin dynamics for hovering atmospheric vehicles. This approach also mitigates the need for control torques and inadvertent actuator saturation difficulties in trying to stabilize a vehicle via control torques produced by unsteady aerodynamics, thrust vectoring, and unsteady throttling. Simulation results, based on a subscale laboratory test flying platform, demonstrate significant improvements in the attitude control robustness of the vehicle with respect to both wind disturbances and off-center of gravity payload changes during flight.


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    Titel :

    Bias Momentum Sizing for Hovering Dual-Spin Platforms


    Beteiligte:
    Lim, Kyong B. (Autor:in) / Shin, Jong-Yeob (Autor:in) / Moerder, Daniel D. (Autor:in)

    Erscheinungsdatum :

    2006-05-01


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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    Lim, K. B. / Shin, J-Y. / Moerder, D. D. | NTRS | 2005


    Bias Momentum Sizing for Hovering Dual-Spin Platforms

    Lim, Kyong / Shin, Jeong-Yeop / Moerder, Daniel | AIAA | 2005


    Bias Momentum Sizing for Hovering Dual-Spin Platforms

    K. B. Lim / J. Y. Shin / D. D. Moerder | NTIS | 2006


    Bias Momentum Sizing Validation Experiment for a Hovering Dual-Spin Vehicle

    Rothhaar, P. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2008