Abstract
The authors apply H/sub infinity /-designed controllers to a generic VSTOL (vertical and short takeoff and landing) aircraft model GVAM. The design study motivates the use of H/sub infinity / techniques, and addresses some of the implementation issues which arise for multivariable and H/sub infinity /-designed controllers. An approach for gain scheduling H/sub infinity / controllers on the basis of the normalized comprime factor robust stabilization problem formulation used for the H/sub infinity / design is developed. It utilizes the observer structure unique to this particular robustness optimization. A weighting selection procedure, has been developed for the associated loop-shaping technique used to specify performance. Multivariable controllers pose additional problems in the event of actuator saturations, and a desaturation scheme which accounts for this is applied to the GVAM. A comprehensive control law was developed and evaluated using the Royal Aerospace Establishment piloted simulation facility. >
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