Temat: discrete 2D systems

Skocz do pozycji: 1.

Tytuł:: Parameter estimation of MIMO two-dimensional ARMAX model based on IGLS method
Autorzy:: Hayati, Zohreh
Shafieirad, Mohsen
Zamani, Iman
Amiri Mehra, Amir Hossein
Abbasi, Zohreh
Tematy:: ARMAX model
discrete 2D systems
iterative identification
MIMO system
parameter estimation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/2183469.pdf Link otwiera się w nowym oknie
Opis:: This paper presents an iterative method for the unbiased identification of linearMultiple-InputMultiple-Output (MIMO) discrete two-dimensional (2D) systems. The system discussed here has Auto-Regressive Moving-Average model with exogenous inputs (ARMAX model). The proposed algorithm functions on the basis of the traditional Iterative Generalized Least Squares (IGLS) method. In summary, this paper proposes a two-dimensional Multiple-Input Multiple-Output Iterative Generalized Least Squares (2DMIGLS) algorithm to estimate the unknown parameters of the ARMAX model. Finally, simulation results show the efficiency and accuracy of the presented algorithm in estimating the unknown parameters of the model in the presence of colored noise.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Względna obserwowalność dodatnich układów ciągło-dyskretnych
Relative observability of positive continuous-discrete time systems
Autorzy:: Trzasko, W.
Tematy:: 2W układy ciągło-dyskretne (hybrydowe)
układy dodatnie
obserwowalność
continuous-discrete 2D systems (hybrid)
positive systems
observability; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/972178.pdf Link otwiera się w nowym oknie
Opis:: W pracy rozpatrzono problem obserwowalności dodatnich liniowych dwuwymiarowych układów ciągło-dyskretnych. Sformułowano definicje oraz podano warunki konieczne i wystarczające obserwowalności oraz względnej obserwowalności. Podano też metodę wyznaczania nieujemnego stanu początkowego dla dowolnej zadanej odpowiedzi układu. Rozważania zilustrowano przykładem.
In the paper the observability problem for linear 2D positive continuous-discrete time systems described by the differential-difference state equations (formulas (1a) and (1b)) and output equation (1c) with boundary conditions (3) is considered. It should be noted that such a model is called a hybrid system in literature [1, 3, 4]. A 2D hybrid system is a dynamic system that includes both continuous- and discrete-time dynamics. It means that the 2D hybrid system state vector contains continuous-time and discrete-time state variables; its input and output vectors depend on continuous time t and discrete step i. The results presented in this work are based on solving the state equations (formula (4)) given in [1]. For simplicity it is assumed that the vector x2(t):=x2 of boundary conditions (3) is constant in the whole interval The definition and necessary and sufficient conditions for the continuous -discrete system positivity are formulated. There is also introduced the definition of observability at the point and a simple condition of observability (Theorem 3) is given. Moreover, based on the left-inverse of the observability matrix (the formula (16)), a simple method for computing the initial state (10) when assuming the knowledge of the output sequence (15) at the points is proposed. In Section 4 the relative observability with respect to state at the point is investigated. This is the special case of observability, but more useful in practice. The considerations are illustrated by a numerical example. Numerical calculations were performed in the Matlab program environment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Controllability of Nonlinear Discrete Systems
Autorzy:: Klamka, J.
Tematy:: system nieliniowy
nonlinear systems
discrete systems
2D systems
controllability
nonlinear covering operators; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/907994.pdf Link otwiera się w nowym oknie
Opis:: Local constrained controllability problems for nonlinear finite-dimensional discrete 1-D and 2-D control systems with constant coefficients are formulated and discussed. Using some mapping theorems taken from nonlinear functional analysis and linear approximation methods, sufficient conditions for constrained controllability in bounded domains are derived and proved. The paper extends the controllability conditions with unconstrained controls given in the literature to cover both 1-D and 2-D nonlinear discrete systems with constrained controls.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Limiting ellipsoid for reachability set of 2D continuous-discrete linear system with disturbances
Autorzy:: Krasoń, E.
Tematy:: dyskretny system sterowania
system liniowy
2D continuous-discrete linear system
continous time systems
discrete systems
linear systems
multidimensional systems
reachability set
support function; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/205518.pdf Link otwiera się w nowym oknie
Opis:: A model of 2D continuous-discrete linear system is considered whose input disturbances are unknown but bounded by known ellipsoid. The formula for a support function of reachability set of this system is presented. A method of construction of ellipsoid limiting reachability set is proposed and illustrated with an example.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: New stability conditions for positive continuous-discrete 2D linear systems
Autorzy:: Kaczorek, T.
Tematy:: system dodatni
system liniowy
układ ciągło-dyskretny
positive systems
2D linear system
continuous-discrete systems; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/907592.pdf Link otwiera się w nowym oknie
Opis:: New necessary and sufficient conditions for asymptotic stability of positive continuous-discrete 2D linear systems are established. Necessary conditions for the stability are also given. The stability tests are demonstrated on numerical examples.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Time crystals
Autorzy:: Sacha, Krzysztof
Wydawca:: Springer Nature
Opis:: This book provides the first comprehensive description of time crystals which have a repeating structure in time. It introduces the fundamental concepts behind time crystals and explores the many different branches of this new research area. The book starts with the original idea of the time crystallization in quantum systems as introduced by Wilczek and follows the development of the field up to the present day. Both spontaneous formation of crystalline structures in time and concepts of the condensed matter physics in the time domain, ranging from Anderson localization in time to many-body systems with exotic interactions, are described. The prospect of creation of novel objects by means of time engineering is also presented. The book assumes knowledge of quantum mechanics to the graduate level. It serves as a valuable reference with pointers to future research directions for graduate students and senior scientists alike.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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