μ-Analysis and DFP Optimization Method of μ-Synthesis for Flight Control System

Because the result of the classical control system design is not unique,there are more than one result that satisfies the required performance.So a design result with good robust stability is selected by structured singular value analysis.This result could be regarded as a multi-target design which considers both the required performance and the robustness.Furthermore,without changing the control law, the DFP optimization method with some necessarily restricted conditions is used to minimize the structure singular value of the system by optimizing some important parameters of the control law. Consequently,a controller which not only has good robustness but also is suitable to the engineering practices is available.Finally,the effectiveness of this method is illustrated by a numerical example of a flight control system.