Abstract
Aircraft flight control systems often require the satisfaction of multiple simultaneous specifications to fulfil different robust stability and performance objectives along with good handling qualities. Many specifications such as H∞-norm, overshoot, undershoot, etc are convex with respect to the closed loop transfer matrix. In this paper it is suggested to use the convex combination method to integrate H∞ frequency domain specifications with additional time domain constraints. For this purpose, existing techniques are used to design an H∞ controller which is then modified in a new structure using Q-parametrization which makes the problem convex in the new design parameter Q. At this stage, if different controllers are obtained for each convex specification, they can be combined into a single controller using convex combination which could satisfy all specifications.
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