ROBUST MULTIRATE EIGENSTRUCTURE ASSIGNMENT WITH FLIGHT CONTROL APPLICATION

摘要

A recent result for multirate state feedback with fast and slow feedback loops is extended to output feedback. This multirate feedback structure is combined with eigenstructure assignment to design a lateral stability augmentation system operating at 50 Hz and a bank angle autopilot operating at 10 Hz for the linearized dynamics of the L-1011 aircraft. A new sufficient condition for robust stability of the multirate system in the presence of linear time invariant continuous time structured state space uncertainty is proposed. A multiobjective optimization is used with both eigenstructure assignment and robustness objectives. A hybrid simulation of the continuous aircraft dynamics demonstrates that the robust multirate eigenstructure assignment flight control system exhibits excellent decoupling between the yaw and roll dynamics.