Modal Multimodel Control Design Approach Applied to Aircraft Autopilot Design

Modal approaches like eigen- structure assignment have shown them- selves to be efficient for flight control design. Performance requirements are easily met using this approach. How- ever, generally, robustness is not satisfac- tory. This paper presents a technique that can be viewed as an improvement over traditional eigenstructure assignment as it produces systems wich meet robust- ness requirements (multimodel approach). The proposed technique reduces to solv- ing a quadratic problem under linear con- straints. The application treated concerns the landing phase of a large transport air- craft. It is shown that standard gain scheduling can be replaced by a single low dimensional dynamic feedback.

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