On the strict and wide-sense stability robustness of uncertain systems-application of a new frequency criterion

The authors discuss a new frequency-domain graphical approach for robust stability of uncertain systems. This method is based on the Mikhailov criterion and requires the plotting of only one Hodograph and evaluation of two boundary conditions. The approach is extended to a more general robust stability sense, i.e., extended or wide-sense Hurwitz stability, which may be applied to a number of robustness problems such as positivity, nonnegativity, spectral analysis and array processing