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Wyświetlanie 1-15 z 1085
Tytuł:
Inverse systems of linear systems
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/141424.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
system odwrotny
system liniowy
system dodatni
osiągalność
stabilność
inverse system
linear system
positive system
reachability
stability
Opis:
The concept of inverse systems for standard and positive linear systems is introduced. Necessary and sufficient conditions for the existence of the positive inverse system for continuous-time and discrete-time linear systems are established. It is shown that: 1) The inverse system of continuous-time linear system is asymptotically stable if and only if the standard system is asymptotically stable. 2) The inverse system of discrete-time linear system is asymptotically stable if and only if the standard system is unstable. 3) The inverse system of continuous-time and discrete-time linear systems are reachable if and only if the standard systems are reachable. The considerations are illustrated by numerical examples.
Źródło:
Archives of Electrical Engineering; 2010, 59, 3-4; 203-216
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy storage systems: power grid and energy market use cases
Autorzy:
Komarnicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/141507.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
storage technologies
storage system sizing
storage system operation
storage system management
storage system use case scenarios
storage system integration
Opis:
Current power grid and market development, characterized by large growth of distributed energy sources in recent years, especially in Europa, are according energy storage systems an increasingly larger field of implementation. Existing storage technologies, e.g. pumped-storage power plants, have to be upgraded and extended by new but not yet commercially viable technologies (e.g. batteries or adiabatic compressed air energy storage) that meet expected demands. Optimal sizing of storage systems and technically and economically optimal operating strategies are the major challenges to the integration of such systems in the future smart grid. This paper surveys firstly the literature on the latest niche applications. Then, potential new use case and operating scenarios for energy storage systems in smart grids, which have been field tested, are presented and discussed and subsequently assessed technically and economically.
Źródło:
Archives of Electrical Engineering; 2016, 65, 3; 495-511
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positivity and stability of fractional 2D Lyapunov systems described by the Roesser model
Autorzy:
Rogowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/202275.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
positive system
stability
fractional 2D system
Lyapunov system
Roesser model
Opis:
A new class of fractional 2D Lyapunov systems described by the Roesser models is introduced. Necessary and sufficient conditions for the positivity and asymptotic stability of the new class of systems are established. It is shown that the checking of the asymptotic stability of positive 2D fractional Lyapunov systems can be reduced to testing the asymptotic stability of corresponding positive standard 1D discretetime systems. The considerations are illustrated by a numerical example.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 195-200
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exact determinantions of maximal output admissible set for a class of semilinear discrete systems
Autorzy:
El Bhih, Amine
Benfatah, Youssef
Rachik, Mostafa
Powiązania:
https://bibliotekanauki.pl/articles/229674.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
discrete-time
output admissible set
semilinear system
asymptotic stability
uncontrolled system
controlled system
delayed system
Opis:
Consider the semilinear system defined by {x(i+1)=Ax(i)+f(x(i)), i≥0 x(0)=x0∈Rn and the corresponding output signal y(i)=C x(i), i≥0, where A is a n×n matrix, C is a p x n matrix and f is a nonlinear function. An initial state x(0) is output admissible with respect to A, f, C and a constraint set Ω ⊂ Rp, if the output signal (y(i)i associated to our system satisfies the condition y(i) ∈ Ω, for every integer i≥0. The set of all possible such initial conditions is the maximal output admissible set Γ(Ω). In this paper we will define a new set that characterizes the maximal output set in various systems(controlled and uncontrolled systems) .Therefore, we propose an algorithmic approach that permits to verify if such set is finitely determined or not. The case of discrete delayed systems is taken into consideration as well. To illustrate our work, we give various numerical simulations.
Źródło:
Archives of Control Sciences; 2020, 30, 3; 523-552
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sterowanie szeregowych urządzeń FACTS za pomocą sygnałów WAMS
Control of series FACTS devices using WAMS signals
Autorzy:
Nogal, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/172956.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
system elektroenergetyczny
stabilność systemu
FACTS
WAMS
electric power system
system stability
Opis:
W pracy przedstawiono możliwość zastosowania sygnałów uzyskanych za pomocą WAMS (wide area monitoring system) do sterowania urządzeniami FACTS (flexible alternating current transmission system), w celu poprawy stabilności systemu elektroenergetycznego (SEE). Algorytm sterowania urządzeniami FACTS, zaproponowany w tej pracy, uwzględnia zmienne stanu ze wszystkich podsystemów. Algorytm ten został wyprowadzony przy wykorzystaniu bezpośredniej metody Lapunowa, dla liniowego wielomaszynowego modelu SEE. W celu udowodnienia skuteczności działania proponowanego algorytmu oraz słuszności założonej tezy stworzono modele matematyczne połączonych systemów elektroenergetycznych z uwzględnieniem szeregowych urządzeń FACTS w liniach wymiany międzysystemowej. Uzyskane wyniki symulacyjne oraz analiza modalna potwierdziły, iż zaproponowany algorytm w znaczącym stopniu przyczynia się do szybkiego wytłumienia kołysań mocy, w połączonym SEE, po wystąpieniu zakłócenia, jednocześnie przyczyniając się do zmniejszenia oscylacji częstotliwości. Dzięki zastosowaniu proponowanego algorytmu, można uzyskać poprawę stabilności systemu elektroenergetycznego, poprzez zmniejszenie kołysań wirników generatorów synchronicznych.
This paper presents the possibility of application of wide area measurements systems (WAMS) to stability enhancing control of FACTS devices installed in tie-lines of interconnected power system. The created algorithm of the control of FACTS devices with system stabilizer takes into consideration frequencies from all subsystems. The proposed algorithm of the control has been obtained from direct Lyapunov method, for linear multi-machine power system model. Mathematical models of interconnected power systems with the use of series FACTS in tie-lines have been created in order to provide efficiency of the proposed algorithm and correctness of the assumed thesis. Obtained simulation results and the modal analysis confirmed that the proposed algorithm is contributing to quick damping swings in power system after disturbance, at the same time contributing to reducing oscillation of the frequency. Thanks to proposed algorithm it is possible to obtain the improvement in stability of the power system.
Źródło:
Archiwum Energetyki; 2011, 41, 2; 31-58
0066-684X
Pojawia się w:
Archiwum Energetyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology-based approach to the modernization of transport and logistics systems with hybrid architecture. Part 1. Proof-of-concept study
Autorzy:
Semenov, I. N.
Filina-Dawidowicz, L.
Powiązania:
https://bibliotekanauki.pl/articles/224033.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transport system
logistics system
innovative changes
topology based approach
system transportu
system logistyki
modernizacja systemu
podejście topologiczne
Opis:
Industrial companies are linked with affiliated firms, suppliers and customers through the supply chains. Such chains operate within large-scale networks directly related to distribution and warehousing. In order to meet the market demands and customer new expectations, the various components of the supply chains have to be developed i.a. through implementation of the innovative vehicles, green and blue technologies. Moreover, modernization processes of transport and logistics system need to be resistant to crucial mistakes related to innovative solutions implementation in order to exclude domino effect occurrence. The authors attempt to build topology-based approach to the modernization of transport and logistics systems. It is assumed that each innovation application is the independent element-based coalition, possessing linked object structure. The results of multi-year researches demonstrate the offered approach as a useful tool to analyze innovative changes for obsolete transport and logistics system as hybrid structure. The ways of system structure transformation, as well as possible innovative effects are considered. The preliminary results have been obtained for compositions on meso-level for the case of marine propulsion modernisation. The paper is illustrated by various examples.
Źródło:
Archives of Transport; 2017, 43, 3; 105-124
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lyapunov functional for a linear system with two delays both retarded and neutral type
Autorzy:
Duda, J.
Powiązania:
https://bibliotekanauki.pl/articles/229843.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Lyapunov functional
time delay system
LTI system
Opis:
The paper presents a method of determining of the Lyapunov quadratic functional for linear time-invariant system with two delays both retarded and neutral type. The Lyapunov functional is constructed for a given its time derivative which is calculated on the trajectory of the system with two delays both retarded and neutral type. The presented method gives analytical formulas for the coefficients of the Lyapunov functional.
Źródło:
Archives of Control Sciences; 2010, 20, 1; 89-98
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reachability of standard and fractional continuous-time systems with constant inputs
Autorzy:
Rogowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/230075.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
constant input
reachability
fractional system
positive system
Opis:
The reachability of standard and fractional-order continuous-time systems with constant inputs is addressed. Positive and non-positive continuous-time linear systems are considered. Necessary and sufficient conditions for the existence of such constant inputs that steers the system from zero initial conditions to the given final state in desired time are derived and proved. As an example of such systems the electrical circuits with DC voltage sources are presented
Źródło:
Archives of Control Sciences; 2016, 26, 2; 147-159
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probabilistic-fuzzy knowledge-based system for managerial applications
Autorzy:
Rudnik, K.
Walaszek-Babiszewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/407276.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
system kierowniczy
system oparty na wiedzy
system rozmyty
knowledge-based system
fuzzy system
probability of fuzzy events
fuzzy association rules
manager decision
Opis:
The paper deals with an inference system with probabilistic-fuzzy knowledge base as a tool which can help users in analyzing complete uncertainty of real problems in the company using fuzzy sets and probability. In the mentioned system, knowledge is saved in the weighted IFTHEN fuzzy rules, where the weights constitute marginal probabilities of the fuzzy events in the antecedents and conditional probabilities of the fuzzy events in the consequents. Moreover, the paper presents a proposal of the use of fuzzy association rules as a method of automatic knowledge base extraction in the inference system. For this purpose a modification of the PF-Growth algorithm is described. A numerical example is analyzed by using wind speed prediction process. The correct estimation of wind speed, as the potential energy resource, is necessary for control of the wind turbine work and it is important for the localization process of wind turbines, production planning and estimating cost-effectiveness of such investments.
Źródło:
Management and Production Engineering Review; 2012, 3, 1; 49-61
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficacy of NegFry decision support system in control of late blight in Poland
Autorzy:
Wojtowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/65001.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
late blight
control
Polska
Phytphthora infestans
NegFry system
efficacy
Routine system
decision support system
NegFry decision system
Źródło:
Journal of Plant Protection Research; 2003, 43, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific emitter identification based on graphical representation of the distribution of radar signal parameters
Autorzy:
Dudczyk, J.
Kawalec, A.
Powiązania:
https://bibliotekanauki.pl/articles/200468.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Specific Emitter Identification
SEI
radar recognition
ELINT system
Electronics Warfare System
EWS
radar
system ELINT
system EWS
Opis:
The article presents some possibilities of same type radar copies identification with the use of graphical representation. The procedure described by the authors is based on transformation and analysis of basic parameters distribution which are measured by the radar signal especially Pulse Repetition Interval. A radar intercept receiver passively collects incoming pulse samples from a number of unknown emitters. Information such as Pulse Repetition Interval, Angle of Arrival, Pulse Width, Radio Frequency and Doppler shifts are not usable. The most important objectives are to determine the number of emitters present and classify incoming pulses according to emitters. To classify radar emitters and precisely identification the copy of the same type of an emitter source in surrounding environment, we need to explore the detailed structure i.e. intra-pulse information, unintentional radiated electromagnetic emission and fractal features of a radar signal. An emitter has its own signal structure. This part of radar signal analysis is called Specific Emitter Identification. Utilization of some specific properties of electronic devices can cause heightening probability of a correct identification.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 391-396
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Interactive Graphical User Interface Module for Soldier Health and Position Tracking System
Autorzy:
Swedan, Wesam F.
Al Issa, Huthifa A.
Aloqoul, Ayat
Alkofahi, Hadeel
Obeidat, Rahaf
Powiązania:
https://bibliotekanauki.pl/articles/2124771.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
graphical user interface
global positioning system
global system for mobile
bioinformatics
tracking system
Opis:
Soldiers are the backbone of any armed force. They usually lose their lives due to the lack of medical assistance in emergency situations. Furthermore, army bases face problems due to the inability to track soldiers’ locations in the field. Hence, this paper proposes an interactive graphical user interface module (IGUIM) for soldiers’ bioinformatics acquisition and emergency reaction during combat, a global positioning system (GPS) is used to track soldiers’ locations through a device carried by the soldier. Soldiers’ bioinformatics are gathered using health monitoring biosensors, bidirectional communication between the soldiers and the army base is established via a global system for mobile (GSM). The proposed interactive module aims to enumerate the soldiers on the battlefield within a database that easily facilitates health monitoring, position tracking and bidirectional communication with each soldier through their identification number. The proposed IGUIM will increase the rate of soldiers’ survival in emergencies, which contributes to preserving the human resources of the army during combat.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 571-571
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional discrete model of an electrical drive with brushless micro-motor
Autorzy:
Matusiak, M.
Bąkała, M.
Wojciechowski, R.
Ostalczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/200454.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
system modeling
system identification
fractional order calculus
Opis:
The use of fractional-order calculus for system modeling is a good alternative to well-known classic integer-order methods, primarily due to the precision with which the modeled object may be mapped. In this study, we created integer and fractional discrete models of a real object – a highspeed brushless micro-motor. The accuracy of the models was verified and compared.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 421-427
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SOFC-based micro-CHP system as an example of efficient power generation unit
Autorzy:
Kupecki, J.
Badyda, K.
Powiązania:
https://bibliotekanauki.pl/articles/240419.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modelowanie
system zasilania
modeling
power system
SOFC
Opis:
Microscale combined heat and power (CHP) unit based on solid oxide fuel cells (SOFC) for distributed generation was analyzed. Operation principle is provided, and the technology development in recent years is brie.y discussed. System baseline for numerical analysis under steady-state operation is given. Grid-connected unit, fuelled by biogas corresponds to potential market demand in Europe, therefore has been selected for analysis. Fuel processing method for particular application is described. Results of modeling performed in ASPEN Plus engineering software with certain assumptions are presented and discussed. Due to high system electrical efficiency exceeding 40%, and overall efficiency over 80%, technology is an example of highly competitive and sustainable energy generation unit.
Źródło:
Archives of Thermodynamics; 2011, 32, 3; 33-43
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach to the realization problem for fractional discrete-time linear systems
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/200792.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional system
linear system
discrete-time system
computation procedure
realization
transfer matrix
macierz transferu
system liniowy
procedura obliczeniowa
sterowanie
Opis:
A new approach to the realization problem for fractional discrete-time linear systems is proposed. A procedure for computation of fractional realizations of given transfer matrices is presented and illustrated by numerical examples.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 9-14
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1085

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