Helicopter Flight Control Law Design Using H ∞ Techniques

This paper describes the development of H∞ controllers for two helicopter models. The study was first carried out using rigid body state feedback only and was then extended to include the rotor flap and lag states. It was observed that the H∞ controllers gave better robustness and performance than the baseline controllers. Moreover, using rotor state feedback, it was possible to design high bandwidth controllers.

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