Direct Design of Handling Qualities by "Mu - Synthesis"

Abstract

The direct design of a cascade control law to satisfy Handling Qualities required in aircraft is shown by three examples. The control law design tool Mu-Synthesis is used to obtain Robust Stability and Robust Performance. Robust Stability is achieved in the presence of parametric uncertainty in the aerodynamic forces. Robust Performance is achieved for frequency-weighted error derived from an ideal model. The specified "handling quality" requirements are the linear portion extracted from the "Low-Order Equivalent Systems" requirements. Comparison step responses between the controlled system and the ideal system are shown. Control law order reduction is performed and evaluated.