Autor: Brdys, M. A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Stability of softly switched multiregional dynamic output controllers with a static antiwindup filter: a discrete-time case
Autorzy:: Zubowicz, T.
Brdyś, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/911226.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: Lyapunov
stability
analysis
fuzzy control
antiwindup
stateczność
sterowanie rozmyte
stabilność Lyapunova
Opis:: This paper addresses the problem of model-based global stability analysis of discrete-time Takagi–Sugeno multiregional dynamic output controllers with static antiwindup filters. The presented analyses are reduced to the problem of a feasibility study of the Linear Matrix Inequalities (LMIs), derived based on Lyapunov stability theory. Two sets of LMIs are considered candidate derived from the classical common quadratic Lyapunov function, which may in some cases be too conservative, and a fuzzy Lyapunov function candidate, which has been proven to significantly reduce the conservatism level, although at the cost of increasing the number of LMIs. Two numerical examples illustrate the main result.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2013, 23, 1; 65-73
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Monitoring of chlorine concentration in drinking water distribution systems using an interval estimator
Autorzy:: Łangowski, R.
Brdyś, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/929615.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: estymator
jakość wody
metoda ograniczająca
modelowanie dynamiczne
estimators
bounding methods
modelling dynamics
water quality
Opis:: This paper describes the design of an interval observer for the estimation of unmeasured quality state variables in drinking water distribution systems. The estimator utilizes a set bounded model of uncertainty to produce robust interval bounds on the estimated state variables of the water quality. The bounds are generated by solving two differential equations. Hence the numerical efficiency is sufficient for on-line monitoring of the water quality. The observer is applied to an exemplary water network and its performance is validated by simulations.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2007, 17, 2; 199-216
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Servo tracking of targets at sea
Autorzy:: Ahmed, A.
Brdyś, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/908404.pdf
Data publikacji:: 2006
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: śledzenie celu
urządzenie śledzące
filtr Kalmana
adaptacyjny układ sterowania
target tracking
tracker
Kalman filter
adaptive control
Opis:: This paper details a proposal for the position control system of a two-axis ship-mounted tracker. Aspects of the non-linear dynamics governing Line-Of-Sight (LOS) errors between the tracker and the target are presented. It is shown that the regulation of LOS errors can be achieved by introducing a feed-forward term based on the target’s velocity. This velocity is not measurable, and an estimator is required. Given that the tracking problem is non-linear, the classical separation principle does not hold, and cascading the estimator and regulator together may not lead to an optimal position control system. The ‘LQAdaptive’ system proposed here aims therefore to improve conformity to the separation principle. Simulation trials show that tracking is improved under the LQAdaptive system in comparison to a simple estimator-regulator structure.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2006, 16, 2; 197-207
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: An interval estimator for chlorine monitoring in drinking water distribution systems under uncertain system dynamics, inputs and chlorine concentration measurement errors
Autorzy:: Łangowski, R.
Brdys, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/330246.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: observer
bounding method
modelling dynamics
water quality
obserwator
dynamika modelowania
jakość wody
Opis:: The design of an interval observer for estimation of unmeasured state variables with application to drinking water distribution systems is described. In particular, the design process of such an observer is considered for estimation of the water quality described by the concentration of free chlorine. The interval observer is derived to produce the robust interval bounds on the estimated water quality state variables. The stability and robustness of the interval observer are investigated under uncertainty in system dynamics, inputs, initial conditions and measurement errors. The bounds on the estimated variables are generated by solving two systems of first-order ordinary differential equations. For that reason, despite a large scale of the systems, the numerical efficiency is sufficient for the on-line monitoring of the water quality. Finally, in order to validate the performance of the observer, it is applied to the model of a real water distribution network.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 309-322
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Indirect adaptive controller based on a self-structuring fuzzy system for nonlinear modeling and control
Autorzy:: Qi, R.
Brdyś, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/929998.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: sterowanie rozmyte
model rozmyty
stabilność
fuzzy control
self-structuring fuzzy model
on-line modeling
stability
Opis:: In this paper, a unified nonlinear modeling and control scheme is presented. A self-structuring Takagi-Sugeno (T-S) fuzzy model is used to approximate the unknown nonlinear plant based on I/O data collected on-line. Both the structure and the parameters of the T-S fuzzy model are updated by an on-line clustering method and a recursive least squares estimation (RLSE) algorithm. The rules of the fuzzy model can be added, replaced or deleted on-line to allow a more flexible and compact model structure. The overall controller consists of an indirect adaptive controller and a supervisory controller. The former is the dominant controller, which maintains the closed-loop stability when the fuzzy system is a good approximation of the nonlinear plant. The latter is an auxiliary controller, which is activated when the tracking error reaches the boundary of a predefined constraint set. It is proven that global stability of the closed-loop system is guaranteed in the sense that all the closed-loop signals are bounded and simulation examples demonstrate the effectiveness of the proposed control scheme.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2009, 19, 4; 619-630
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Optimizing control by robustly feasible model predictive control and application to drinkingwater distribution systems
Autorzy:: Tran, V. N.
Brdys, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/91723.pdf
Data publikacji:: 2011
Wydawca:: Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:: optimizing
model predictive control
MPC
Robustly Feasible MPC
RFMPC
Drinking
Water Distribution Systems
DWDS
genetic algorithm
Opis:: The paper considers optimizing Model Predictive Control (MPC) for nonlinear plants with output constraints under uncertainties. Although the MPC technology can handle the constraints in the model by solving constraint model based optimization task, satisfying the plant output constraints under the model uncertainty still remains a challenge. The paper proposes Robustly Feasible MPC (RFMPC), which achieves feasibility of the outputs in the controlled plant. The RFMPC which is applied to control quantity in Drinking Water Distribution Systems (DWDS) is illustrated by application to the DWDS example. In the simulation exercise, Genetic Algorithm is selected as the optimization solver and the reduced search space methodology is applied in the implementation under MATLABEPANET environment.
Źródło:: Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 1; 43-57
2083-2567
2449-6499
Pojawia się w:: Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Fuzzy logic gain scheduling for non-linear servo tracking
Autorzy:: Brdyś, M. A.
Littler, J. J.
Powiązania:: https://bibliotekanauki.pl/articles/908000.pdf
Data publikacji:: 2002
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: elektrotechnika
tracking
servo control
gain scheduling
fuzzy logic
stiction friction
hard non-linearities
Opis:: This paper proposes the use of gain scheduling as a method of controlling a servo system with hard non-linear elements. The servo controls two elements of a tracker mounted on a ship at sea. There is stiction at the zero velocity point and non-linear friction against the motion of each tracker axis. A dual feedback loop control structure is employed. Fuzzy logic is used to provide smoothly varying non-linear scheduling functions to map the velocity of the servo relevant to the deck of the ship onto the rate loop controller parameters. Consideration is given to the use of a derivative signal as a secondary input to the fuzzy inference system. Results are presented which demonstrate that this method of controlling the servo system gives a dramatic improvement over the traditional linear control methodology for low velocity tracking performance. A linear PID controller is used in the outer loop and its design is also given some consideration.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2002, 12, 2; 209-219
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Intelligent PI controller and its application to dissolved oxygen tracking problem
Autorzy:: Zubowicz, T.
Brdys, M. A.
Piotrowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/384365.pdf
Data publikacji:: 2010
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: aeration process
artificial intelligence
control systems
dissolved oxygen
tracking problem
fuzzy logic controller
genetic algorithms
intelligent control
Takagi Sugeno Kang method
TSK
soft switching
wastewater treatment
Opis:: The paper addresses design, calibration, implementation and simulation of the intelligent PI controller used for dissolved oxygen (DO) tracking at wastewater treatment plant (WWTP). The calibration process presented in this paper utilizes both engineering and scientific methods. Verification of the control system design method was obtained via simulation experiments.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 3; 16-24
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Design and Stability of Fuzzy Logic Multi-Regional Output Controllers
Autorzy:: Domański, P.
Brdyś, M. A.
Tatjewski, P.
Powiązania:: https://bibliotekanauki.pl/articles/908274.pdf
Data publikacji:: 1999
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: sterowanie nieliniowe
sterowanie wewnętrzne
zbiór rozmyty
model Takagi-Sugeno
nonlinear output control
fuzzy logic
Takagi-Sugeno models
stability conditions
Opis:: Design and stability analysis of fuzzy multi-regional digital controllers is considered in the paper. The controllers are based on a notion of NARMAX systems, very similar to the Takagi-Sugeno fuzzy model. The nonlinear system is approximated by a number of linear subsystems. Linear controllers are designed for all subsystems. It can be made in a classical way due to the subsystems linearity. The controllers are blended into one controller by employing fuzzy logic, the result being the fuzzy multi-regional controller (FuMR). The stability analysis of nonlinear systems with FuMR controllers composed of dynamic output feedback local linear controllers is provided. Examples illustrate the design procedure and the meaning of the stability criterion.
Źródło:: International Journal of Applied Mathematics and Computer Science; 1999, 9, 4; 883-897
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A biochemical multi-species quality model of a drinking water distribution system for simulation and design
Autorzy:: Arminski, K.
Zubowicz, T.
Brdys, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/907619.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: multi species
chloramine
quality
drinking water
distribution system
critical infrastructure system
chloramina
jakość
woda pitna
system dystrybucji
infrastruktura krytyczna
Opis:: Drinking Water Distribution Systems (DWDSs) play a key role in sustainable development of modern society. They are classified as critical infrastructure systems. This imposes a large set of highly demanding requirements on the DWDS operation and requires dedicated algorithms for on-line monitoring and control to tackle related problems. Requirements on DWDS availability restrict the usability of the real plant in the design phase. Thus, a proper model is crucial. Within this paper a DWDS multi-species quality model for simulation and design is derived. The model is composed of multiple highly inter-connected modules which are introduced to represent chemical and biological species and (above all) their interactions. The chemical part includes the processes of chloramine decay with additional bromine catalysis and reaction with nitrogen compounds. The biological part consists of both heterotrophic and chemo-autotrophic bacteria species. The heterotrophic bacteria are assumed to consume assimilable organic carbon. Autotrophs are ammonia oxidizing bacteria and nitrite oxidizing bacteria species which are responsible for nitrification processes. Moreover, Disinfection By-Products (DBPs) are also considered. Two numerical examples illustrate the derived model’s behaviour in normal and disturbance operational states.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2013, 23, 3; 571-585
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Wieloobszarowy miękkoprzełączalny regulator PI w sterowaniu stężeniem tlenu w biologicznej oczyszczalni ścieków
Multiregional softly switched PI controller for dissolved oxygen tracking at wastewater treatment plant
Autorzy:: Zubowicz, T.
Piotrowski, R.
Brdyś, M. A.
Powiązania:: https://bibliotekanauki.pl/articles/275119.pdf
Data publikacji:: 2010
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: oczyszczanie ścieków
napowietrzanie
systemy sterowania
wastewater treatment
aeration
control systems
Opis:: Napowietrzanie jest podstawowym procesem decydującym o jakości oczyszczania ścieków. Prawidłowy przebieg procesów biologicznych wymaga dostarczenia odpowiedniej ilości tlenu. Zapewnia to optymalne warunki oczyszczania ścieków, dostateczne wymieszanie ścieków z osadem czynnym i zmniejsza główny koszt eksploatacji oczyszczalni ścieków, czyli koszt pompowania powietrza. W artykule zaproponowano sterowanie stężeniem tlenu z wykorzystaniem wielkoobszarowego miękko przełączalnego regulatora PI. Jako metodę przełączania pomiędzy sygnałami sterującymi w poszczególnych obszarach pracy układu wybrano metodę przełączania Takagi-Sugeno-Kanga. Zaprojektowany system sterowania został symulacyjnie zbadany na podstawie rzeczywistych danych z oczyszczalni ścieków w Kartuzach.
Aeration is a very important and expensive process at wastewater treatment plant. Oxygen is provided as a fundamental component for the biological processes. This paper proposes the multiregional PI control system with softly switched Takagi-Sugeno-Kang method for dissolved oxygen concentration tracking. The controller is validated by simulation based on real data records from wastewater treatment plant in Kartuzy.
Źródło:: Pomiary Automatyka Robotyka; 2010, 14, 1; 16-20
1427-9126
Pojawia się w:: Pomiary Automatyka Robotyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Adaptive predictions of the euro/złoty currency exchange rate using state space wavelet networks and forecast combinations
Autorzy:: Brdyś, M. A.
Brdyś, M. T.
Maciejewski, S. M.
Powiązania:: https://bibliotekanauki.pl/articles/330138.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: currency exchange rate
artificial intelligence
state space wavelet network
Metropolis Monte Carlo
forecast combinations
data generating process
kurs wymiany walut
sztuczna inteligencja
sieć falkowa
Opis:: The paper considers the forecasting of the euro/Polish złoty (EUR/PLN) spot exchange rate by applying state space wavelet network and econometric forecast combination models. Both prediction methods are applied to produce one-trading-day-ahead forecasts of the EUR/PLN exchange rate. The paper presents the general state space wavelet network and forecast combination models as well as their underlying principles. The state space wavelet network model is, in contrast to econometric forecast combinations, a non-parametric prediction technique which does not make any distributional assumptions regarding the underlying input variables. Both methods can be used as forecasting tools in portfolio investment management, asset valuation, IT security and integrated business risk intelligence in volatile market conditions.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2016, 26, 1; 161-173
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Adaptive prediction of stock exchange indices by state space wavelet networks
Autorzy:: Brdyś, M. A.
Borowa, A.
Idźkowiak, P.
Brdyś, M. T.
Powiązania:: https://bibliotekanauki.pl/articles/907656.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: prognozowanie
giełda
sztuczna inteligencja
wyżarzanie symulowane
forecasting
stock exchange
artificial intelligence
state space wavelet network
simulated annealing
Opis:: The paper considers the forecasting of the Warsaw Stock Exchange price index WIG20 by applying a state space wavelet network model of the index price. The approach can be applied to the development of tools for predicting changes of other economic indicators, especially stock exchange indices. The paper presents a general state space wavelet network model and the underlying principles. The model is applied to produce one session ahead and five sessions ahead adaptive predictors of the WIG20 index prices. The predictors are validated based on real data records to produce promising results. The state space wavelet network model may also be used as a forecasting tool for a wide range of economic and non-economic indicators, such as goods and row materials prices, electricity/fuel consumption or currency exchange rates.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 337-348
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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