A Dynamic S-Procedure for Dynamic Uncertainties. Issue 25 (2022)

• Record Type: Journal Article
• Authors: Holicki, Tobias; Scherer, Carsten W.
• Is Part Of: IFAC-PapersOnLine. Volume 55:Issue 25(2022)
• Page Start: 103
• Page End: 108
• Publication Date: 2022
• Subjects: Robustness Analysis -- Dynamic Uncertainties -- Integral Quadratic Constraints -- Linear Matrix Inequalities; Automatic control -- Periodicals; 629.805
• DOI: 10.1016/j.ifacol.2022.09.331
• Languages: English
• ISSNs: 2405-8963

Abstract

Abstract: We show how to compose robust stability tests for uncertain systems modeled as linear fractional representations and affected by various types of dynamic uncertainties. Our results are formulated in terms of linear matrix inequalities and rest on the recently established notion of finite-horizon integral quadratic constraints with a terminal cost. The construction of such constraints is motivated by an unconventional application of the S-procedure in the frequency domain with dynamic Lagrange multipliers. Our technical contribution reveals how this construction can be performed by dissipativity arguments in the time-domain and in a lossless fashion. This opens the way for generalizations to time-varying or hybrid systems.