On the robustness properties of H∞ integrated flight and propulsion controllers for a large transport aircraft

In this paper we consider the robust performance properties of some integrated flight and propulsion controllers for a large transport aircraft, designed using three different H_∞ methods. The controller design methods compared are H_∞ loop shaping, two-block mixed-sensitivity and four-block mixed-sensitivity. The study provides an interesting practical illustration of the consequences of pole-zero cancellations in certain H_∞ control designs.