Slender ballistic reentry vehicles are highly susceptible to roll rate changes caused by small asymmetries in mass and configuration. One particular combination of asymmetries, consisting of a body-fixed trim angle of attack and a small radial c.g. offset, can cause a rapid spinup into resonance, with a large amplification in trim angle of attack and a concomitant increase in drag. By controlling the magnitude and direction of the c.g. offset with a moving-mass roll control system, it is possible to control the roll rate near resonance and to limit the angle-of-attack and drag response to a controlled value. A feedback law is derived, and the control system is demonstrated with a digital-computer simulation of the equations of rotational motion. (Author)


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    Title :

    Roll Resonance Control of Angle of Attack for Reentry Vehicle Drag Modulation


    Contributors:

    Publication date :

    1980


    Size :

    29 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English