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On some frequency sweeping tests for delay-dependent stability: A model transformation case study

This note focuses on stability properties of several model transformations used for some delay-dependent analysis problem. The proposed results are expressed in terms of structured singular values and consist of some frequency sweeping tests that can be easily implemented. We derive also several (sufficient) conditions which improve (or recover) previous delay-dependent [delay-independent) results from control literature. Comments on the conservatism of the presented results are also considered. Note that this paper can be seen as completing (into a delay-dependent framework) the contribution of Chen et al [6].