Application of eigenstructure assignment to flight control design: Some extensions

The eigenstructure assignment flight control design methodology is extended to include dynamic compensator synthesis and damping ratio sensitivity reduction. Dynamic compensators may be designed via eigenstructure assignment by utilizing a composite system structure. The success of this design methodology depends upon proper choice of the desired eigenvectors. Sensitivity measures are developed that relate the perturbation of the damping ratio to perturbations in the stability derivatives. A damping ratio sensitivity plot is introduced that allows the damping ratio sensitivity to be reduced without altering the nominal damping ratio. Examples of the lateral dynamics of an L-1011 aircraft are presented to illustrate the design methods.