Robustness analysis of an integrated flight and propulsion control system using micrometer and the v-gap metric

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Robustness analysis of an integrated flight and propulsion control system using micrometer and the v-gap metric

Gatley, S.L. / Bates, D.G. / Hayes, M.J. / Postlethwaite, I.

The application of two frequency domain analysis tools is described, the structured singular value my and the ny-gap metric, to the problem of evaluating the robustness properties of a multivariable IFPC (Integrated Flight ant Propulsion Control) system for an experimental V/STOL (Vertical/Short Take-Off and Landing) aircraft configuration. Variations in aircraft parameters and dynamics over the V/STOL flight envelope are represented as LFT (Linear Fractional Transformation) based parametric uncertainty descriptions, using a simple black-box type modeling approach. Tight bounds an mü for the resulting high-order real parametric uncertainty model are computed by introducing small amounts of additional complex uncertainty, in order to analyze the stability robustness properties of the IFPC system. Stability and performance robustness of the IFPC system is also evaluated using the nü-gap metric. Results generated by both analysis tools are seen to be consistent, and to agree well with evaluation results obtained for the IFPC system in piloted simulation.