Uncertainty modelling in time-delay systems: Parametric vs. unstructured approach

Abstract

This contribution is focused on comparison of two basic approaches to uncertainty modelling and corresponding robust stability analyses for a system with uncertain time-delay. A paper bleaching process, described both as a system with parametric uncertainty and in the form of unstructured multiplicative uncertainty model, is considered as a testing plant. The robust stability of closed control loop with selected controller and appropriate uncertain model of controlled plant is verified and obtained results are compared.