dc.contributor.author | Djouadi, S. M. | en |
dc.contributor.author | Charalambous, Charalambos D. | en |
dc.creator | Djouadi, S. M. | en |
dc.creator | Charalambous, Charalambos D. | en |
dc.date.accessioned | 2019-04-08T07:45:38Z | |
dc.date.available | 2019-04-08T07:45:38Z | |
dc.date.issued | 2004 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/43306 | |
dc.description.abstract | In this paper we consider the optimal disturbance attenuation problem and robustness for linear time-varying (LTV) systems. This problem corresponds to the standard optimal H ∞ problem for LTI systems. The problem is analyzed in the context of nest algebra of causal and bounded linear operators. In particular, using operator inner-outer factorization it is shown that the optimal disturbance attenuation problem reduces to a shortest distance minimization between a certain operator to the nest algebra in question. Banach space duality theory is then used to characterize optimal time-varying controllers. Alignment conditions in the dual are derived under certain conditions, and the optimum is shown to satisfy an allpass condition for LTV systems, therefore, generalizing a similar concept known to hold for LTI systems. The optimum is also shown to be equal to the norm of a time-varying Hankel operator analogous to the Hankel operator, which solves the optimal standard H ∞ problem. Duality theory leads to a pair of finite dimensional convex optimizations which approach the true optimum from both directions not only producing estimates within desired tolerances, but also allow the computation of optimal time-varying controllers. | en |
dc.source | Proceedings of the IEEE Conference on Decision and Control | en |
dc.source | Proceedings of the IEEE Conference on Decision and Control | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-14344249857&partnerID=40&md5=146ee2375653221adc1dd024d82bc8bb | |
dc.subject | Algebra | en |
dc.subject | Performance | en |
dc.subject | Stability | en |
dc.subject | Topology | en |
dc.subject | Banach spaces | en |
dc.subject | Linear systems | en |
dc.subject | Convergence of numerical methods | en |
dc.subject | Time varying control systems | en |
dc.subject | Control equipment | en |
dc.subject | Hilbert spaces | en |
dc.subject | Positive integers | en |
dc.subject | Unit circles | en |
dc.title | On optimal performance for linear time-varying systems | en |
dc.type | info:eu-repo/semantics/conferenceObject | |
dc.description.volume | 1 | |
dc.description.startingpage | 875 | |
dc.description.endingpage | 880 | |
dc.author.faculty | Πολυτεχνική Σχολή / Faculty of Engineering | |
dc.author.department | Τμήμα Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών / Department of Electrical and Computer Engineering | |
dc.type.uhtype | Conference Object | en |
dc.contributor.orcid | Charalambous, Charalambos D. [0000-0002-2168-0231] | |
dc.gnosis.orcid | 0000-0002-2168-0231 | |