A moving mass trim controller increase the accuracy of axisymmetric, ballistic vehicles. The MMTC is different than other moving mass schemes because it generates an angle-of-attack (AOA) directly from the mass motion. The nonlinear equations of motion for a ballistic vehicle with one moving point mass are derived and provide the basis for a detailed simulation model. The full nonlinear equations are linearized to produce a set of linear, time-varying autopilot equations. These autopilot equations are analyzed and used to develop theoretical design tools for the creation of MMTCs for both fast and slow spinning vehicles. A fast spinning MMTC is designed for a generic artillery rocket that uses principal axis misalignment to generate trim AOA. A slow spinning is designed for a generic reentry vehicle that generates a trim AOA with a center of mass offset and aerodynamic drag. The performance of both MMTCs are evaluated with the detailed simulation.


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    Title :

    Moving mass trim control for aerospace vehicles


    Contributors:

    Publication date :

    1994


    Size :

    19 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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