Temat: Discrete-time systems

Skocz do pozycji: 1.

Tytuł:: Computation of positive realizations for descriptor linear discrete-time systems
Autorzy:: Kaczorek, T.
Tematy:: algorithm
computation
computation of positive realizations
descriptor lnear discrete-time systems
linear discrete-time systems
Discrete-time Systems
transfer matrices
method for determination of positive realizations; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/116668.pdf Link otwiera się w nowym oknie
Źródło:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 3; 545-551
2083-6473
2083-6481
Pojawia się w:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Opis:: A new method for computation of positive realizations of given transfer matrices of descriptor linear discrete‐time linear systems is proposed. Necessary and sufficient conditions for the existence of positive realizations of transfer matrices are given. A procedure for computation of the positive realizations for descriptor discrete‐time linear systems is proposed and illustrated by examples.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Minimax decisions in some problems of control with many sources of disturbances
Autorzy:: Grzybowski, Andrzej
Tematy:: Optimal stochastic control
Discrete-time systems; Pokaż więcej
Data publikacji:: 1989
Powiązania:: https://bibliotekanauki.pl/articles/747681.pdf Link otwiera się w nowym oknie
Źródło:: Mathematica Applicanda; 1989, 17, 31
1730-2668
2299-4009
Pojawia się w:: Mathematica Applicanda
Opis:: .
In the paper, a stochastic system with many sources of disturbances is considered. These disturbances have distributions belonging to the exponential family with some unknown parameters. Moreover, it is assumed that a control is disturbed too. A horizon of control is a random variable with a known distribution. Under some additional assumptions the problem of Bayes and minimax control of such system is solved.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Local Controllability of Fractional Discrete-Time Semilinear Systems
Autorzy:: Klamka, J.
Tematy:: sterowanie
możliwość kontroli
discrete-time systems
controllability; Pokaż więcej
Data publikacji:: 2011
Powiązania:: https://bibliotekanauki.pl/articles/387282.pdf Link otwiera się w nowym oknie
Źródło:: Acta Mechanica et Automatica; 2011, 5, 2; 55-58
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Opis:: In the paper unconstrained local controllability problem of finite-dimensional fractional discrete-time semilinear systems with constant coefficients is addressed. Using general formula of solution of difference state equation sufficient condition for local unconstrained controllability in a given number of steps is formulated and proved. Simple illustrative example is also presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Regular design equations for the discrete reduced-order Kalman filter
Autorzy:: Hippe, P.
Tematy:: optimal estimation
polynomials
multivariable systems
discrete-time systems; Pokaż więcej
Data publikacji:: 2012
Powiązania:: https://bibliotekanauki.pl/articles/229814.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Control Sciences; 2012, 22, 2; 161-174
1230-2384
Pojawia się w:: Archives of Control Sciences
Opis:: In the presence of white Gaussian noises at the input and the output of a system Kalman filters provide a minimum-variance state estimate. When part of the measurements can be regarded as noise-free, the order of the filter is reduced. The filter design can be carried out both in the time domain and in the frequency domain. In the case of full-order filters all measurements are corrupted by noise and therefore the design equations are regular. In the presence of noise-free measurements, however, they are not regular so that standard software cannot readily be applied in a time-domain design. In the frequency domain the spectral factorization of the non-regular polynomial matrix equation causes no problems. However, the known proof of optimality of the factorization result requires a regular measurement covariance matrix. This paper presents regular (reduced-order) design equations for the reduced-order discrete-time Kalman filter in the time and in the frequency domains so that standard software is applicable. They also allow to formulate the conditions for the stability of the filter and to prove the optimality of the existing solutions.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Relationships Between Two Definitions of Fading Memory for Discrete-Time Systems
Autorzy:: Borys, A.
Tematy:: discrete-time systems
time-invariant operators
fading memory property; Pokaż więcej
Data publikacji:: 2015
Powiązania:: https://bibliotekanauki.pl/articles/226448.pdf Link otwiera się w nowym oknie
Źródło:: International Journal of Electronics and Telecommunications; 2015, 61, 4; Bibliogr. 8 poz.
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Opis:: In this paper, we refer to two definitions of fading memory property, which were published in the literature, for discrete-time circuits and systems. One of these definitions relates to systems working with signals (sequences) defined for both the positive and negative integers, expanding from minus infinity to plus infinity. On the other hand, the second one refers to systems processing sequences defined only for nonnegative integers, that is starting at the discrete-time point equal to zero and expanding to plus infinity. We show here that the second definition follows from the first one. That is they are not independent. Moreover, we also show that if an operator describing a system possesses a fading memory according to the second definition, then its associated operator has this property, too, but in accordance with the first definition.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Positive fractional linear systems
Dodatnie układy liniowe niecałkowitego rzędu
Autorzy:: Kaczorek, T.
Tematy:: układy liniowe
układy dyskretne
linear systems
discrete-time systems; Pokaż więcej
Data publikacji:: 2011
Powiązania:: https://bibliotekanauki.pl/articles/277019.pdf Link otwiera się w nowym oknie
Źródło:: Pomiary Automatyka Robotyka; 2011, 15, 2; 91-112
1427-9126
Pojawia się w:: Pomiary Automatyka Robotyka
Opis:: An overview of some recent published and unpublished results on positive fractional continuous-time and discrete-time linear systems is given. The first part of the paper is devoted to the positive continuous-time fractional systems. For those systems the solutions to the fractional state equations are proposed. Necessary and sufficient conditions for the positivity, reachability and stability are established. In the second part similar problems are considered for positive discrete-time fractional systems.
W pracy dokonano syntetycznego przeglądu nowych publikowanych i niepublikowanych wyników dotyczących dodatnich ciągłych i dyskretnych układów liniowych niecałkowitego rzędu. W części pierwszej poświęconej układom ciągłym podano rozwiązanie układu równań stanu, warunki konieczne i wystarczające dodatniości, osiągalności i stabilności układów dodatnich. W części drugiej przedstawiono podobne wyniki dla układów dyskretnych.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Nonlinear optimal control problem with constraints for general 2-D systems
Autorzy:: Biły, Barbara
Tematy:: Problems involving ordinary differential equations
Discrete-time systems; Pokaż więcej
Data publikacji:: 1993
Powiązania:: https://bibliotekanauki.pl/articles/747365.pdf Link otwiera się w nowym oknie
Źródło:: Mathematica Applicanda; 1993, 22, 36
1730-2668
2299-4009
Pojawia się w:: Mathematica Applicanda
Opis:: W pracy rozpatruje się zadanie sterowania optymalnego dla modelu 2-D przy nieliniowym wskaźniku jakości, przy ograniczeniach na wektory stanu i sterowania. W oparciu o Twierdzenie Podstawowe programowania matematycznego formułuje się warunki konieczne dla tego zadania. Idee zawarte w tej pracy wykorzystywane już były w artykułach [1], [3] przy nieco innych modelach i bez warunków ograniczających.
In this paper a optimal, nonlinear problem for general two-dimensional, stationary, discrete systems is presented. The state and control vectors are subject to restrictions in this optimal problem. Using a method of transformation for the system and the performance index, the problem of finding the optimal sequence of control vectors is solved by a method of ma-thematical programming. The necessary conditions are formulated. The simple numerical example illustrates the presented method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Quasi-Sliding Mode Control of Discrete-Time Systems
Autorzy:: Bartoszewicz, A.
Tematy:: sterowanie
system dyskretny
sliding-mode control
discrete-time systems; Pokaż więcej
Data publikacji:: 1999
Powiązania:: https://bibliotekanauki.pl/articles/908266.pdf Link otwiera się w nowym oknie
Źródło:: International Journal of Applied Mathematics and Computer Science; 1999, 9, 4; 801-810
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Opis:: A reaching law approach to the design of discrete-time quasi-sliding mode control systems is considered. First the required position of the system representative point with reference to the sliding plane is specified, and then novel control strategies, which drive the system in such a way that the position actually changes according to the specification, are proposed. The strategies are linear and consequently the undesirable chattering and high-frequency switching between different values of the control signal are avoided. Furthermore, the state of the controlled system is driven to the narrowest possible band around the sliding plane. The strategies, when compared with previously published results, are simpler and they guarantee favourable performance of the controlled systems while using essentially reduced control effort.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Motion control algorithm and tuning rules for mechanical devices with low sampling-rate electronics
Autorzy:: Gil, Jorge Juan
Diaz, Inaki
Tematy:: motion control
cascade control loops
discrete-time systems
stability
mechatronic systems; Pokaż więcej
Data publikacji:: 2020
Powiązania:: https://bibliotekanauki.pl/articles/229549.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Control Sciences; 2020, 30, 1; 123-138
1230-2384
Pojawia się w:: Archives of Control Sciences
Opis:: Controlling mechanical systems with position and velocity cascade loops is one of the most effective methods to operate this type of systems. However, when using low-rate sampling electronics, the implementation is not trivial and the resulting performance can be poor. This paper proposes effective tuning rules that only require establishing the bandwidth of the inner velocity loop and an estimation of the inertia of the mechanism. Since discrete-time mechatronic systems can also exhibit unstable behavior, several stability conditions are also derived. By using the proposed methodology, a P-PI control algorithm is developed for a desktop haptic device, obtaining good experimental performance with low sampling-rate electronics.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: Fuzzy Predictive Control of Fractional-Order Nonlinear Discrete-Time Systems
Autorzy:: Domek, S.
Tematy:: model
sterowanie
system dyskretno-czasowy
discrete-time systems
control; Pokaż więcej
Data publikacji:: 2011
Powiązania:: https://bibliotekanauki.pl/articles/387296.pdf Link otwiera się w nowym oknie
Źródło:: Acta Mechanica et Automatica; 2011, 5, 2; 23-26
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Opis:: At the end of the 19th century Liouville and Riemann introduced the notion of a fractional-order derivative, and in the latter half of the 20th century the concept of the so-called Grünewald-Letnikov fractional-order discrete difference has been put forward. In the paper a predictive controller for MIMO fractional-order discrete-time systems is proposed, and then the concept is extended to nonlinear processes that can be modelled by Takagi-Sugeno fuzzy models. At first nonlinear and linear fractional-order discrete-time dynamical models are described. Then a generalized nonlinear fractional-order TS fuzzy model is defined, for which equations of a predictive controller are derived.
Dostawca treści:: Biblioteka Nauki

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