Robustness is usually considered as stability robustness in the face of perturbed plant dynamics. If, additionally, a certain level of performance has to be guaranteed, robustness is modified to performance robustness. In the s-domain the method of maximum singular values and structured singular values can easily be reformulated to obtain acceptable performance in the presence of plant uncertainties.
KeywordsStructure Uncertainty Performance Robustness Unperturbed Case Nominal Index Robustness Criterion
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