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Wyświetlanie 1-15 z 51
Tytuł:
Stabilization of Inertial Plant with Time Delay Using Fractional Order Controller
Autorzy:
Ruszewski, A.
Nartowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/386566.pdf
Data publikacji:
2011
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
sterownik
obwód zamknięty
controller
closed loop
Opis:
The paper presents the problem of designing of a fractional order controller satisfying the conditions of gain and phase margins of the closed-loop system with time-delay inertial plant. The transfer function of the controller follows directly from the use of Bode's ideal transfer function as a reference transfer function for the open loop system. Using the classical D-partition method and the gain-phase margin tester, a simple computational method for determining stability regions in the controller parameters plane is given. An efficient analytical procedure to obtain controller parameter values for specified gain and phase margin requirements is also given. The considerations are illustrated by numerical examples computed in MATLAB/Simulink.
Źródło:
Acta Mechanica et Automatica; 2011, 5, 2; 117-121
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving the Problem of Discrete Process Control Synthesis Using Optimization on a Sliding Interval
Autorzy:
Julayeva, Zhazira
Wójcik, Waldemar
Kashaganova, Gulzhan
Togzhanova, Kulzhan
Mambetov, Saken
Powiązania:
https://bibliotekanauki.pl/articles/27311920.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
discrete process control
optimization
sliding interval
equation of a closed loop system
closed loop control system
Opis:
The paper brings forward an idea of multi-threaded computation synchronization based on the shared semaphored cache in the multi-core CPUs. It is dedicated to the implementation of multi-core PLC control, embedded solution or parallel computation of models described using hardware description languages. The shared semaphored cache is implemented as guarded memory cells within a dedicated section of the cache memory that is shared by multiple cores. This enables the cores to speed up the data exchange and seamlessly synchronize the computation. The idea has been verified by creating a multi-core system model using Verilog HDL. The simulation of task synchronization methods allows for proving the benefits of shared semaphored memory cells over standard synchronization methods. The proposed idea enhances the computation in the algorithms that consist of relatively short tasks that can be processed in parallel and requires fast synchronization mechanisms to avoid data race conditions.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 2; 383--389
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity-based stability evaluation of closed piping networks
Autorzy:
Fu, Y.
Cai, Y.
Wu, K.
Powiązania:
https://bibliotekanauki.pl/articles/1933181.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska
Tematy:
closed-loop water system
sensitivity
stability
evaluation
Opis:
Aiming at a closed-loop water system of HVAC engineering, the authors put forward an evaluation method of systems' stability based on sensitivity. It has three evaluating indexes: [alfa] - the summation of flow changes in other subcircuits influenced by resistance change in a certain subcircuit [Beta] - the summation of flow changes in a certain sub circuit influenced by resistance changes in other subcircuits; [gamma] - average [Beta] (or [alfa]) value of each subcircuit, reflecting the strength of regulating interference between subcircuits. The method is used to analyze the stability of a reverse return system (RRS) and a direct return system (DRS). The DRS subcircuit farthest from the heat source and the middle RRS are the least stable. Stability of the whole RRS is inferior to that of the DRS.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 3; 197-202
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Closed Loop Supply Chain with Production Planning
Autorzy:
Stecz, W.
Powiązania:
https://bibliotekanauki.pl/articles/409322.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
closed loop
supply chain
optimization
production planning
Opis:
We present a Closed Loop Supply Chain (CLSC) model that supports a production planning (PP) process. CLSC model is based on CLSC framework model which consists of four main centers: collection, recovery center, distribution and disposal centers. These logistics parts support main production lines. Some quantity of the products is recovered and the factories don’t need to spend money for production. This is a simple cost reduction process. In CLSC literature one can hardly meet the models of production planning processes supported by CLSC. Important problem with that models is the computational complexity when one wants to prepare production plans for more than one time period. This is connected with a number of the numerical variables of the CLSC and PP models which are usually Integer Programming models solved with Branch & Bound algorithms. We present some modifications of the widely known and used constraints in the CLSC models to optimize solving process. All the experiments were conducted with the CPLEX solver.
Źródło:
Research in Logistics & Production; 2016, 6, 2; 117-128
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waste management as an element of the creation of a closed loop of supply chains on the example of mining and extractive industry
Autorzy:
Dyczkowska, Joanna
Bulhakova, Yuliia
Łukaszczyk, Zygmunt
Maryniak, Anna
Powiązania:
https://bibliotekanauki.pl/articles/409945.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
closed loop of supply chain
mining
sustainable supply chain
wastes
Opis:
The purpose of the study is presentation of the method of increasing the competitiveness of the mining industry through the demonstration of the possibility and potential in closing the loop of supply chains through waste management. A critical analysis of the source literature and an arithmetic analysis of statistical data in static and dynamic perspectives were accepted to be the research method. It has been found that the structure of the level of mining wastes and the level of their recovery rates demonstrate a large potential of closing the loop of chains in this industry and, at the same time, a potential to extend the chains through directing the material from recovery to various sectors. This constitutes an example of the direction of activities that are in line with the EU strategies for the economies of other states which possess this type wastes.
Źródło:
Management Systems in Production Engineering; 2020, 1 (28); 60-69
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robustness of closed-loop glucose control systems
Autorzy:
Wyciślok, Artur
Śmieja, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/29432415.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
artificial pancreas
closed-loop control
insulin pump
type 1 diabetes
Opis:
The main purpose of this work is to provide an extensive, simulation-based comparison of robustness of PID and MPC algorithms in control of blood glucose levels in patients with type 1 diabetes and thus answer the question of their safety. Cohort testing, with 1000 simulated, randomized patients allowed to analyze specific control quality indicators, such as number of hypoglycemic events, and length of hypo- and hyperglycemia periods. Results show that both algorithms provide a reasonable safety level, taking into account natural changes of patients’ physiological parameters. At the same time, we point out drawbacks of each solution, as well as general problems arising in close-loop control of blood glucose level.
Źródło:
Archives of Control Sciences; 2023, 33, 3; 681--705
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An active electromagnetic stabilization of the Leipholz column
Autorzy:
Szmidt, T.
Przybyłowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/229816.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
follower load
flutter
closed-loop control
active stabilization
electromagnetic actuators
Opis:
We study the application of electromagnetic actuators for the active stabilization of the Leipholz column. The cases of the compressive and tensional load of the column placed in air and in water are considered. The partial differential equation of the column is discretized by Galerkin's procedure, and the stability of the obtained control system is evaluated by the eigenvalues of its linearization. Four different methods of active stabilization are investigated. They incorporate control systems based on feedback proportional to the transverse displacement of the column, its velocity and the current in the electromagnets. Conditions in which these strategies are effective in securing safe operation of the column are discussed in detail.
Źródło:
Archives of Control Sciences; 2012, 22, 2; 161-174
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formal modelling of IEC 61499 function blocks with integer-valued data types
Autorzy:
Gerber, C.
Ivanova-Vasileva, I.
Hanisch, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/971024.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
modelling
verification
net condition/event systems
IEC 61499
closed-loop behaviour
Opis:
During the last couple of years a lot of component- or object-oriented approaches have been presented to ease the implementation and reconfiguration of distributed control systems. Using these frameworks, the structure of the control objects follows the configuration of the mechanical components, and each object is instantiated as often as the corresponding device occurs in a plant. Having an object library, a control engineer will glue objects together, which means, in the context of the IEC 61499, connecting function blocks by event and data connections. This rapid way of implementation and reconfiguration makes also high demands on the verification process, which has to be done after each change. This means that the model of the plant has to be updated and the model of the distributed controllers have to be automatically generated to connect both in a closed loop. Both formal models should be modular to manage even large systems. Furthermore, the controller must be able to interact with the plant not only via Boolean data but via integer-valued data as well. Thus, the existing verification approaches have to be extended and an execution and a data processing model defined. The execution model includes the function block interface and the Execution Control Chart as well as their interconnections. For the arithmetical operations of adding and subtracting as well as the comparison of Boolean and integer-valued data it is shown how the data processing inside the function blocks has to be transformed to the formal model. Consequently, rules are defined for the transformation of the execution and data processing of function blocks with Boolean and integer-valued data. Due to the proposed separation, the resulting data processing model is not limited to IEC 61499 Basic Function Blocks. As formal model, Net Condition/Event modules (NCEM) and structures are used. Modelling of the plant and the analysis of the resulting closed-loop behaviour are presented using a small, but realistic manufacturing system.
Źródło:
Control and Cybernetics; 2010, 39, 1; 197-231
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Observation Of Nonlinear Vibrations Using A Closed-Loop Vibration System
Autorzy:
de Barros, E.
d’Andrade Souto, C.
Mathias, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/220744.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinear vibrations
closed-loop vibration system
nonlinear structural dynamics
cantilever beam
Opis:
This paper presents experimental observation of nonlinear vibrations in the response of a flexible cantilever beam to transverse harmonic base excitations around its flexural mode frequencies. In the experimental setup, instead of manual control of the signal excitation frequency and amplitude, a closed-loop vibration system is used to keep the excitation amplitude constant during the frequency sweep and to increase confidence in the experimental results. The experimental results show the presence of the third mode in the response when varying the excitation frequency around the fourth mode. The frequency-response curves, response spectrum and Poincaré plots were used for characterization of nonlinear dynamic behaviour of the beam.
Źródło:
Metrology and Measurement Systems; 2015, 22, 4; 559-564
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Closed-loop swing-up and stabilization of inverted pendulum by finite-horizon LQR applied in 2-DOF concept
Autorzy:
Docekal, Tomas
Ozana, Stepan
Pal Singh, Abhaya
Kawala-Sterniuk, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/2049926.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
finite-horizon LQR
closed-loop swing-up
2-DOF structure
inverted pendulum
Opis:
The general framework of this paper is the control design of complex nonlinear systems. The proposed approach is demonstrated with the use of a case study regarding a typical mechatronic system - control design of inverted pendulum on the cart. The methodology used for the solution of this problem is based on two- degree of freedom control structure (2-DOF) with feed-forward and feedback terms. Feed-forward term represents a solution of trajectory generation problem and feedback term stands for a state controller. Both of these parts generally fall into the category of optimal control problems. The article focuses on the design of a finite-horizon linear quadratic controller and its application in 2-DOF structure with the use of customized LQR computation procedure, showing all necessary steps of the design, including source codes. It is proposed that the developed methodology is general and can be adopted for most of other nonlinear mechatronic systems, including unstable or non-minimum phase systems. This has been already tested successfully for models of both double and triple inverted pendulums. The functionality of the concept under real conditions can also be seen in Ozana (2018a) and Ozana (2018b) showing preliminary experiments with real apparatus.
Źródło:
Control and Cybernetics; 2020, 49, 1; 109-122
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compensation of supply current harmonics, reactive power, and unbalanced load current balance in the closed-loop control of a shunt active power filter
Autorzy:
Bielecka, Agata
Wojciechowski, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/135289.pdf
Data publikacji:
2020
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
shunt active power filter (SAPF)
harmonic compensation
reactive power compensation
prediction
closed-loop
open-loop
Opis:
This paper presents the compensation tasks performed by a shunt active power filter, including compensation of harmonic currents, reactive power, and an unbalanced load current. The paper demonstrates novel control of the shunt active power filter in a closed-loop system. The control algorithm was verified by performing simulations and compared the simulated results with those obtained in an open-loop control system. All simulations were conducted in the PLECS program using a control algorithm written in C programming language.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 61 (133); 9-16
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel robust control design for unstable systems with dual pole and dual zero
Autorzy:
Zhang, X.
Zhang, G.
Powiązania:
https://bibliotekanauki.pl/articles/205848.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
unstable process
robust control
improvement
closed-loop gain shaping
dual pole
dual zero
Opis:
In this note, a novel robust control design for a class of unstable systems with dual pole and dual zero is addressed. In the algorithm, αfeedback node was moved from the interior of the controlled plant to its right-hand side. Then, the closed-loop gain shaping algorithm was used to design the feedback transfer function. Consequently, controller and the controlled plant have clear physical meaning and are easily tuned. Simulation results show that the control effects are better than for the previous modification, the system can have rapid settling time with no overshoot, zero steadystate error and satisfactory robust stability to model perturbation and disturbance. The method has the advantages of simple and efficient design, and it was also successfully applied to control static unstable missile.
Źródło:
Control and Cybernetics; 2013, 42, 3; 613-625
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza regulatora ułamkowego rzędu zapewniającego zadany zapas stabilności układu zamkniętego z obiektem inercyjnym pierwszego rzędu z całkowaniem i opóźnieniem
Design of fractional order controller satisfying gain and phase margin of the closed loop system with time-delay inertial plant with integral term
Autorzy:
Nartowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/275492.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
regulator ułamkowego rzędu
stabilność układu zamkniętego
fractional order controller
closed loop system stability
Opis:
Rozważono problem projektowania regulatora ułamkowego rzędu zapewniającego zadany zapas stabilności układu regulacji z obiektem inercyjnym pierwszego rzędu z całkowaniem i opóźnieniem oraz układu regulacji z obiektem niestabilnym. Zaproponowana metoda projektowania bazuje na zastosowaniu idealnej transmitancji Bodego jako wzorca dla układu otwartego z regulatorem. Podano komputerową metodę syntezy regulatora ułamkowego rzędu. Rozważania zilustrowano przykładem liczbowym i wynikami badań symulacyjnych.
The paper considers the design problem of fractional order controller satisfying gain and phase margin of the closed loop system with time-delay inertial plant with integral term and closed loop system with unstable plant. The proposed method is based on using Bode's ideal transfer function as a reference transfer function for the open loop system. Computer method for synthesis of fractional controller is given. The considerations are illustrated by numerical example and results of computer simulation.
Źródło:
Pomiary Automatyka Robotyka; 2010, 14, 2; 443-452
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gospodarka Obiegu Zamkniętego – kryteria osiągnięcia i perspektywa wdrożenia w Polsce
Circular Economy - the criteria for achieving and the prospect of implementation in Poland
Autorzy:
Jaworski, T.
Grochowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/357238.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska
Tematy:
gospodarka obiegu zamkniętego
gospodarka o obiegu zamkniętym
gospodarka cyrkulacyjna
circular economy
closed-loop economy
closed circle economy
Opis:
Gospodarka obiegu zamkniętego (GOZ) to alternatywny model gospodarki, który opiera się na zasadzie zamykania obiegu w cyklu życia produktu. W praktyce polega na maksymalnym wykorzystaniu potencjału drzemiącego w produktach, a po zakończeniu cyklu życia ponownym ich wykorzystaniu w takim samym lub innym celu. Dzięki temu możliwe jest utrzymanie surowców jak najdłużej w obrębie gospodarki oraz zmniejszenie liczby odpadów kierowanych na składowiska. GOZ została przyjęta przez Unię Europejską jako strategia realizacji jej celów środowiskowych i zwiększenia konkurencyjności unijnej gospodarki. Polska zobowiązała się do przekształcenia swojej gospodarki, jednak znajduje się dopiero na początku drogi w kierunku GOZ i musi zmagać się z barierami społecznymi, technologicznymi, legislacyjnymi i finansowymi.
Circular Economy (CE) is an alternative model of the economy, which is based on closing the product’s life cycle. In practice, CE is about maximizing use of the product and re-using them for the same or another purpose after the end of the life cycle. This makes possible to maintain materials and resources in the economy as long as possible and reduce landfill waste. Circular Economy was adopted by the European Union as a strategy for achieving its environmental goals and increasing the competitiveness of the EU economy. Poland has committed itself to transforming its economy into the CE, but it is only at the beginning of the road and has to deal with social, technological, legislative and financial barriers.
Źródło:
Archiwum Gospodarki Odpadami i Ochrony Środowiska; 2017, 19, 4; 13-22
1733-4381
Pojawia się w:
Archiwum Gospodarki Odpadami i Ochrony Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A fuzzy approach to multi-objective mixed integer linear programming model for multi-echelon closed-loop supply chain with multi-product multi-time-period
Autorzy:
Akin Bas, Sema
Ahlatcioglu Ozkok, Beyza
Powiązania:
https://bibliotekanauki.pl/articles/406583.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
closed-loop supply chain management
multi-objective optimization
fuzzy mixed-integerlinear programming
inventory decision
Opis:
By the green point of view, supply chain management (SCM), which contains supplier and location selection, production, distribution, and inventory decisions, is an important subject being examined in recent years by both practitioners and academicians. In this paper, the closed-loop supply chain (CLSC) network that can be mutually agreed by meeting at the level of common satisfaction of conflicting objectives is designed. We construct a multi-objective mixed-integer linear programming (MOMILP) model that allows decision-makers to more effectively manage firms’ closed-loop green supply chain (SC). An ecological perspective is brought by carrying out the recycling, remanufacturing and destruction to SCM in our proposed model. Maximize the rating of the regions in which they are located, minimize total cost and carbon footprint are considered as the objectives of the model. By constructing our model, the focus of customer satisfaction is met, as well as the production, location of facilities and order allocation are decided, and we also carry out the inventory control of warehouses. In our multi-product multi-component multi-time-period model, the solution is obtained with a fuzzy approach by using the min operator of Zimmermann. To illustrate the model, we provide a practical case study, and an optimal result containing a preferable level of satisfaction to the decision-maker is obtained.
Źródło:
Operations Research and Decisions; 2020, 30, 1; 25-46
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
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