21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-1.5.1

DESIGN OF FLIGHT CONTROL SYSTEM FOR A HIGHLY FLEXIBLE AIRCRAFT USING CONVEX SYNTHESIS

Dardenne I., Ferreres G.*
ONERA, France; *Supaero, France

Keywords: flight control system, highly flexible aircraft

A simple method is proposed for the synthesis of robust dynamic feedback or feed forward controllers, which satisfy classical time and frequency domains specifications. The only assumption on the plant is to be linear time invariant. The controller· is obtained as the solution of a Linear (or Quadratic) Programming problem when only time domain specifications are fixed.(1} The optimization problem becomes a LMI problem when frequency domain specifications are introduced. When synthesizing a feed forward controller, a multimodal synthesis is moreover possible. The method is then applied to the synthesis of a lateral flight control system for a highly flexible transport aircraft. Trade-offs between various specifications are explored.

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