http://195.251.240.227/jspui/handle/123456789/197 2026-05-30T00:45:03Z 2026-05-30T00:45:03Z Antoniou, Efstathios Tzekis, P. Pantelous, A. http://195.251.240.227/jspui/handle/123456789/10396 2018-02-28T17:06:04Z 2014-01-01T00:00:00Z

Title: On the Computation of the Response of Perturbed Discrete Time Descriptor Systems Authors: Antoniou, Efstathios; Tzekis, P.; Pantelous, A. Abstract: Descriptor systems provide the natural framework for the study of a wide variety of physical, electrical, mechanical, economical and social systems. In this paper, the response of a Linear Time Invariant (LTI), descriptor system in discrete-time over a finite time interval is examined, whose coefficient matrix on the right hand side of the descriptor equation has been perturbed by a constant matrix. The response of the perturbed system is explicitly computed using a modified version of the well known Weierstrass canonical form and a simplified approximation formula is derived. A numerical example illustrates the findings. On the Computation of the Response of Perturbed Discrete Time Descriptor Systems (PDF Download Available). Available from: http://www.researchgate.net/publication/275967348_On_the_Computation_of_the_Response_of_Perturbed_Discrete_Time_Descriptor_Systems [accessed Aug 12, 2015]. Description: Δημοσιεύσεις μελών--ΣΤΕΦ--Τμήμα Μηχανικών Πληροφορικής, 2014

2014-01-01T00:00:00Z Antoniou, Efstathios Tzekis, P. Pantelous, A. http://195.251.240.227/jspui/handle/123456789/10380 2018-02-28T17:06:01Z 2014-01-01T00:00:00Z

Title: On the response of linear time invariant higher order systems with perturbed coefficients Authors: Antoniou, Efstathios; Tzekis, P.; Pantelous, A. Abstract: We provide a new approach towards the analysis of the response of higher order systems whose coefficients are subject to norm bounded perturbations. Based on the magnitudes of the perturbations, we obtain bounds of the response of the system. The first order case, that is state space or more generally descriptor systems, has been extensively studied in the past using a variety of approaches and many results have been produced. On the other hand, a very popular strategy to overcome the difficulty of high order systems, is to reduce them to first order equivalents. Our approach utilizes the aforementioned techniques to study the response of polynomial systems under perturbations. On the response of linear time invariant higher order systems with perturbed coefficients. Available from: http://www.researchgate.net/publication/275967418_On_the_response_of_linear_time_invariant_higher_order_systems_with_perturbed_coefficients [accessed Aug 12, 2015]. Description: Δημοσιεύσεις μελών--ΣΤΕΦ--Τμήμα Μηχανικών Πληροφορικής, 2014

2014-01-01T00:00:00Z Vologiannidis, Stavros Antoniou, Efstathios http://195.251.240.227/jspui/handle/123456789/10395 2018-02-28T17:06:04Z 2014-06-01T00:00:00Z

Title: On the Parametrization of Linearizations of Polynomial Matrices Authors: Vologiannidis, Stavros; Antoniou, Efstathios Abstract: In this note we propose a new approach for the construction of a parametrization of the linearizations corresponding to a given polynomial matrix. A linearization of a polynomial matrix is a first order polynomial matrix which is in a certain sense equivalent to the original one. The main advantage of linearization techniques, is that in most cases, a linearization can be easily constructed from the coefficients of the polynomial matrix. In view of their advantages and applications many linearization techniques have been developed by several authors in the recent years. In the present paper we propose a unifying approach aiming to serve as a bridge between the two main linearization approaches already known in the literature. Description: Δημοσιεύσεις μελών--ΣΤΕΦ--Τμήμα Μηχανικών Πληροφορικής, 2014

2014-06-01T00:00:00Z Vologiannidis, Stavros Antoniou, Efstathios Karampetakis, Nikolas Vardulakis, Antonis http://195.251.240.227/jspui/handle/123456789/10363 2018-02-28T17:05:58Z 2013-01-01T00:00:00Z

Title: Notions of equivalence for linear multivariable systems Authors: Vologiannidis, Stavros; Antoniou, Efstathios; Karampetakis, Nikolas; Vardulakis, Antonis Abstract: The present paper is a survey on linear multivariable systems equivalences. We attempt a review of the most significant types of system equivalence having as a starting point matrix transformations preserving certain types of their spectral structure. From a system theoretic point of view, the need for a variety of forms of polynomial matrix equivalences, arises from the fact that different types of spectral invariants give rise to different types of dynamics of the underlying linear system. A historical perspective of the key results and their contributors is also given. Description: Δημοσιεύσεις μελών--ΣΤΕΦ--Τμήμα Μηχανικών Πληροφορικής, 2013

2013-01-01T00:00:00Z