Robust regional stability analysis of continuous time-delay systems

By utilising the matrix measure properties, the authors derive serval robust stability criteria for continuous time-delay systems with time-invariant parameter uncertainties. In particular, considering some required performances, a wedge, a disk, or a strip in the open left half of the complex plane is the stable region of concern. To complete the proof of the proposed results, a certain symmetric property needs be used, which has not been addressed in the literature. The authors also provide some examples to illustrate the feasibility of the proposed results.