Moving mass trim control for aerospace vehicles. (English) Zbl 0947.70018

A moving mass trim controller is proposed to increase the accuracy of axisymmetric ballistic vehicles. The moving mass trim controller differs from other moving mass schemes, because it generates an angle of attack directly from the mass motion. The nonlinear equations of motion for a ballistic vehicles with one moving point mass are derived which provide a basis for a detailed simulation model. The nonlinear equations are linearized to produce a set of linear time-varying autopilot equations. The autopilot equations allow to develop moving mass trim controllers for both fast and slow spinning vehicles. The fast controller is designed for a generic artillery rocket that uses principal axis misalignment to generate a trim angle of attack. The slow controller is designed for a re-entry vehicle that generates a trim angle of attack due to co-center of mass offset and aerodynamic drag. Finally, the authors evaluate the numerical performance of both controllers.


70Q05 Control of mechanical systems
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