Frequency Domain Approach and Threshold Selector for Robust Model-based Fault Detection and Isolation

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Abstract Problems of residual generation and evaluation for uncertain dynamic systems are formulated and investigated with the aid of frequency domain approaches and H∞- optimization techniques. Based on the parametrization of residual generators the design of optimal residual generators reduces to an optimization problem that is solved by H∞-techniques. To improve the robustness of residual evaluation a new evaluation index is introduced, under which thresholds for different types of uncertain systems are derived.