Robust Stability of Feedback Control Systems with Uncertain Parameters and Unmodelled Dynamics

A number of authors have recently provided results on a generalization of Kharitonov´s interval polynomial problem. This more general formulation includes linearly dependent perturbations in the coefficients of a polynomial and the main objective is to provide computationally tractable criteria for robust stability. In this paper, provide robust stability criteria are provided in an even more general setting¿one which also accommodates unmodelled dynamics.