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Wyszukujesz frazę "switching time" wg kryterium: Temat


Wyświetlanie 1-15 z 15
Tytuł:
Performance Comparison of Protection Strategies in WDM Mesh Networks
Autorzy:
Singh, H. K.
Aggarwal, S.
Singh, S.
Mohapatra, B.
Nagaria, R. K.
Tiwari, S.
Powiązania:
https://bibliotekanauki.pl/articles/308073.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
blocking probability
protection
survivability
switching time
WDM networks
Opis:
Recent development in optical networking employing wavelength division multiplexing (WDM) fulfills the high bandwidth demand applications. Failure of such networks, leads to enormous data and revenue loss. Protection is one of the key techniques, which is used in designing survivable WDM networks. In this paper we compare dedicated and shared protection strategies employed inWDMmesh networks to protect optical networks failure, particularly fiber failure. Dijkstra's shortest path algorithm is considered for carrying out simulations. The paper compares the performance of protection schemes, such as, dedicated path protection (DPP), shared path protection (SPP) and shared link protection (SLP) schemes. Capacity utilization, switching time and blocking probability are the parameters considered to measure the performance of the protection schemes. Simulation results show that, SPP is more efficient in terms of capacity utilization over DPP and SLP schemes, whereas, SLP offered better switching time than both DPP and SPP schemes. The average call drop rate is minimum for shared path protection scheme and maximum for shared link protection scheme.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 1; 62-69
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a general standby system and its optimization
Autorzy:
Cha, J. H.
Yun, W. Y.
Powiązania:
https://bibliotekanauki.pl/articles/2069693.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
warm standby
accelerated life testing
virtual age
switching time
mean lifetime
Opis:
Redundancy or standby is a technique that has been widely applied to improving system reliability and availability in the stage of system design. In this paper, we consider a standby system with two units in which the first unit (unit 1) starts its operation under active state and the other unit (unit 2) is under cold standby state at the starting point. After a specified time s (switching time), the state of unit 2 is changed to warm standby state and, as soon as the operating unit 1 fails, the state of unit 2 is changed to active state. If unit 1 fails before times, the system fails. Units can fail at both active and warm standby states. A general method for modeling the standby system is adopted and, based on it, system performance measures (system reliability and mean life) are derived. We consider the problem of determining optimal switching time which maximizes the expected system life. Some numerical examples are studied.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 1; 95--100
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient cost savings in the procurement procedures of industrial enterprises
Autorzy:
Pleschenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/409118.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
procedury zamówień publicznych
koszty tranzakcji
oszczędność
alternatywni dostawcy
purchasing
alternative supplier
transaction costs
switching time
cost saving
Opis:
Cost saving is one of the most important factors for sustainability of the industrial enterprise. The company must optimize its procurement process, monitor and forecast of market prices, search and introduce alternative, select future partners carefully and apply optimal procedures. Also the buyer has to distribute the orders among suppliers, motivate them in cooperation and promote competition between suppliers. It is important to evaluate the transaction costs for buyer and participants before announcement of the tender, compare them with the parameters of the transaction and the market situation. The article shows growing costs in case of superposition of procurement cycles, and notes that the switch is characterized not only by cost but also time figures. It is concluded that the minimization of switching time leads to cost saving.
Źródło:
Research in Logistics & Production; 2012, 2, 1; 17-30
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode speed control of an induction motor drive using time-varying switching line
Autorzy:
Tarchała, G.
Powiązania:
https://bibliotekanauki.pl/articles/1193307.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sliding mode control
equivalent control
induction motor
speed controller
time-varying switching line
Opis:
An equivalent sliding mode control method of an induction motor speed has been discussed. The control signal consists of two parts: a continuous and discontinuous one. Very good dynamical response of the drive system has been obtained, which however changes influenced by external and parametric disturbances occurring under various operation conditions. In order to ensure identical dynamic performance of the speed transients and system robustness during the switching line reaching phase, regardless of external and parametric disturbances, the time-varying switching line is proposed. The simulation results have been validated by experimental tests of the induction motor drive system.
Źródło:
Power Electronics and Drives; 2017, 2, 37/1; 105-120
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global Foreign Accent Rating of Code-Switched and L2-Only Sentences
Autorzy:
Šimáčková, Šárka
Podlipský, Václav Jonáš
Powiązania:
https://bibliotekanauki.pl/articles/620764.pdf
Data publikacji:
2016-06-01
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
phonetic interference
bilingual mode
code-switching
voice onset time
Opis:
Recent studies of short-term phonetic interference suggest that code-switching can lead to momentary increases in L1 influence on L2. In an earlier study using a single acoustic measure (VOT), we found that Czech EFL learners’ pronunciation of English voiceless stops had shorter, i.e. more L1-Czech-like, VOTs in code-switched compared to L2-only sentences. The first aim of the current study was to test the prediction that native listeners would judge the code-switched English productions as more foreign-accented than the L2-only productions. The results provide only weak support for this prediction. The second aim was to test whether more native-like VOT values would correlate with improved accentedness scores. This was confirmed for sentence-initial stops.
Źródło:
Research in Language; 2016, 14, 2; 149-164
1731-7533
Pojawia się w:
Research in Language
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matlab application for study the distorted load current influence on low voltage circuit breakers breaking capacity
Zastosowanie oprogramowania Matlab do analizy wpływu zniekształcenia prądu wyłączanego na zdolności łączeniowe wyłącznika niskiego napięcia
Autorzy:
Smugala, D.
Bonk, M.
Ziemski, R.
Powiązania:
https://bibliotekanauki.pl/articles/266339.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
current harmonics
switching parameters
arcing time
harmoniczne prądu
parametry łączeniowe
czas łukowy
Opis:
Matlab engineering software application for measurement results’ analysis process improvement has been presented in this paper. The main purpose of the study was the analysis of the impact of the interrupted current distortion level on selected low voltage (LV) circuit-breakers’ (CB) current breaking capability. Influence of various levels and characters of current distortion were analyzed for few types of LV circuit-breakers. Huge number of data collected as the result of performed tests needed process automatization for fast extraction the specific resultant data required for future analysis. It was realized by means of developed Matlab software script. Developed script, basis on recorded diagrams, permitted for fast determination the arcing time, arc energy and power for various voltage levels and interrupted current phase and values.
W artykule przedstawiono zastosowanie oprogramowania inżynierskiego Matlab do usprawnienia analizy wyników pomiarów uzyskanych drogą eksperymentu. Implementacja opracowanego skryptu pozwoliła na automatyzacje procesu ekstrakcji wybranych danych bezpośrednio z zarejestrowanych drogą pomiarów przebiegów napięć i prądów. Głównym celem przeprowadzonych badań była analiza wpływu formy oraz poziomu odkształcenia wyłączanego prądu na podstawowe zdolności łączeniowe wybranych łączników niskiego napięcia. Z uwagi na obszerną bazę uzyskanych wyników pomiarów, a tym samym dużą liczbę danych koniecznych do przeprowadzenia analizy, zastosowano specjalnie w tym celu opracowany skrypt dedykowany dla środowiska Matlab, a pozwalający na automatyzacje wspomnianego procesu, w szczególności na wyodrębnienie z pozyskanych przebiegów napięć i prądów, niezbędnych do dalszej analizy informacji. Dzięki opracowanemu oprogramowaniu możliwe stało się szybkie pozyskanie danych dotyczących czasów łukowych, energii i mocy łuku dla różnych parametrów sieci oraz różnych chwil czasowych rozejścia się styków.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 57; 117-120
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilization of autonomous linear time invariant fractional order derivative switched systems with different derivative in subsystems
Autorzy:
Balochian, S.
Powiązania:
https://bibliotekanauki.pl/articles/200478.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear time invariant fractional order derivative
switching systems
linear matrix inequality
LMI
Opis:
In this paper, the stabilization problem of a autonomous linear time invariant fractional order (LTI-FO) switched system with different derivative order in subsystems is outlined. First, necessary and sufficient condition for stability of an LTI-FO switched system with different derivative order in subsystems based on the convex analysis and linear matrix inequality (LMI) for two subsystems is presented and proved. Also, sufficient condition for stability of an LTI-FO switched system with different derivative order in subsystems for more than two subsystems is proved. Then a sliding sector is designed for each subsystem of the LTI-FO switched system. Finally, a switching control law is designed to switch the LTI-FO switched system among subsystems to ensure the decrease of the norm of the switched system. Simulation results are given to show the effectiveness of the proposed variable structure controller.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 495-503
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations
Autorzy:
Backfrieder, C.
Ostermayer, G.
Powiązania:
https://bibliotekanauki.pl/articles/226992.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mobile network simulation
system levels
long term evolution
time division duplex
variable switching point
Opis:
This paper introduces an LTE system level simulator and presents investigations of scenarios with differently balanced traffic emergence between uplink and downlink as well as inhomogeneous distribution of link direction asymmetry. In the TDD mode of LTE, duplexing is implemented via sharing the time domain between uplink and downlink users. This is done by different switching configurations, which offer varying capacity distributions between downlink and uplink, from a downlink-heavy configuration with 90 percent of the capacity in downlink direction to uplink heavy configurations with 60 percent uplink. We utilize the available capacity perfectly by adjusting the link configuration appropriately to traffic emergence. Performance gains when selecting a configuration appropriate to the arising traffic compared to usage of a static configuration with equally distributed capacity are investigated. In case of different configurations, additional interference can occur in neighbored cells due to distinct communication direction at the same time. We clarify the differences between these scenarios and quantify the gains and losses when the switching point between uplink and downlink is variable.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 2; 171-178
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems related to the correct determination of switching power losses in high-speed SiC MOSFET power modules
Autorzy:
Zięba, Dawid
Rąbkowski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2173649.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SiC MOSFET
power modules
channel current
switching losses
time alignment
moduł mocy
prąd kanału
straty przełączania
wyrównanie czasu
Opis:
High-speed switching capabilities of SiC MOSFET power modules allow building high power converters working with elevated switching frequencies offering high efficiencies and high power densities. As the switching processes get increasingly rapid, the parasitic capacitances and inductances appearing in SiC MOSFET power modules affect switching transients more and more significantly. Even relatively small parasitic capacitances can cause a significant capacitive current flow through the SiC MOSFET power module. As the capacitive current component in the drain current during the turn-off process is significant, a commonly used metod of determining the switching power losses based on the product of instantaneous values of drain-source voltage and drain current may lead to a severe error. Another problem is that charged parasitic capacitances discharge through the MOSFET resistive channel during the turn-on process. As this happens in the internal structure, that current is not visible on the MOSFET terminals. Fast switching processes are challenging to measure accurately due to the imperfections of measurement probes, like their output signals delay mismatch. This paper describes various problems connected with the correct determination of switching power losses in high-speed SiC MOSFET power modules and proposes solutions to these problems. A method of achieving a correct time alignment of waveforms collected by voltage and current probes has been shown and verified experimentally. In order to estimate SiC MOSFET channel current during the fast turn-off process, a method based on the estimation of nonlinear parasitic capacitances current has also been proposed and verified experimentally.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140695
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault tolerant control of switched nonlinear systems with time delay under asynchronous switching
Autorzy:
Xiang, Z.
Wang, R.
Chen, Q.
Powiązania:
https://bibliotekanauki.pl/articles/929592.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
opóźnienie czasowe
sterowanie tolerujące uszkodzenia
układ komutowany
układ nieliniowy
time delay
fault tolerant control
switched nonlinear systems
asynchronous switching
Opis:
This paper investigates the problem of fault tolerant control of a class of uncertain switched nonlinear systems with time delay under asynchronous switching. The systems under consideration suffer from delayed switchings of the controller. First, a fault tolerant controller is proposed to guarantee exponentially stability of the switched systems with time delay. The dwell time approach is utilized for stability analysis and controller design. Then the proposed approach is extended to take into account switched time delay systems with Lipschitz nonlinearities and structured uncertainties. Finally, a numerical example is given to illustrate the effectiveness of the proposed method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 3; 497-506
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The selected problems of controllability of discrete-time switched linear systems with constrained switching rule
Autorzy:
Babiarz, A.
Czornik, A.
Klamka, J.
Niezabitowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200554.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
controllability
switched systems
discrete-time linear systems
switching rule
hybrid systems
sterowalność
systemy przełącznicowe
systemy liniowe
zasada przełączania
systemy hybrydowe
Opis:
In this paper the controllability problem for discrete-time linear switched systems is considered. The main goal is to find a control signal that steers any initial state to a given final state independently of the switching signal. In the paper, it is assumed that there are some constraints posed on the switching signal. Moreover, we present a necessary and sufficient conditions of some kinds of controllability. Three types of controllability, namely: from zero initial state to any final state, from any initial state to zero final state and from any initial state to any final state are considered. Finally, three illustrative examples are shown.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 657-666
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical synthesis of parameter-varying filter of constant component with application to switching systems
Autorzy:
Piskorowski, J.
Kaszyński, R.
Powiązania:
https://bibliotekanauki.pl/articles/221736.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
data acquisition
analog signal processing
transient behavior
dynamics
switching systems
linear parameter-varying technique (LPV)
linear time-varying systems (LTV)
Opis:
In this paper, we propose a concept of a continuous-time filter of constant component that exhibits a very short response in the time domain if compared to the traditional time-invariant filter. The improvement of the filter dynamics was achieved as a result of the time-varying parameters which were introduced to the filter structure. Such a designed filter is then applied in a system which switches many distorted signals which should be filtered as fast as possible. The paper is of review nature and presents both a theoretical background of the proposed filter and the results of simulations.
Źródło:
Metrology and Measurement Systems; 2011, 18, 3; 471-480
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extended Lie algebraic stability analysis for switched systems with continuous-time and discrete–time subsystems
Autorzy:
Zhai, G.
Xu, X.
Lin, H.
Liu, D.
Powiązania:
https://bibliotekanauki.pl/articles/929816.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
układ komutowany
funkcja Lapunowa
algebra Lie'go
stateczność wykładnicza
switched systems
common quadratic Lyapunov functions
Lie algebra
exponential stability
arbitrary switching
dwell time scheme
Opis:
We analyze stability for switched systems which are composed of both continuous-time and discrete-time subsystems. By considering a Lie algebra generated by all subsystem matrices, we show that if all subsystems are Hurwitz/Schur stable and this Lie algebra is solvable, then there is a common quadratic Lyapunov function for all subsystems and thus the switched system is exponentially stable under arbitrary switching. When not all subsystems are stable and the same Lie algebra is solvable, we show that there is a common quadratic Lyapunov-like function for all subsystems and the switched system is exponentially stable under a dwell time scheme. Two numerical examples are provided to demonstrate the result.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 4; 447-454
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of periodically switched on and off electrical equipment operation
Modele pracy urządzeń elektroenergetycznych o cyklicznych czasach załączeń i wyłączeń
Autorzy:
Matuszak, Z.
Nicewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/257292.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
model matematyczny
cykliczny czas załączeń i wyłączeń
urządzenie elektroenergetyczne
czas do uszkodzenia
mathematical model
periodically switching on and off
electrical equipment
time to failure
Opis:
Mathematical models of periodically switched on and off electrical equipment operation are presented in the paper. Models of electrical devices in the initial instant of the working state, when idle (not working) at the initial instant or not having idle moments between switching are characterised. The basic defined value for these cases has been the time to failure.
Przedstawiono modele pracy urządzeń elektroenergetycznych o cyklicznych czasach załączeń i wyłączeń. Scharakteryzowano modele pracy urządzeń, gdy w chwili początkowej jest ono w stanie pracy; w stanie spoczynku (nie pracuje) lub nie posiada w czasie pracy tzw. czasów spoczynku między załączeniami. Podstawową wielkością, jaką określono dla tych przypadków, był czas pracy do uszkodzenia urządzenia.
Źródło:
Problemy Eksploatacji; 2008, 2; 185-193
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quadratic performance analysis of switched affine time-varying systems
Autorzy:
Li, W.
Huang, C.
Zhai, G.
Powiązania:
https://bibliotekanauki.pl/articles/330032.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
switched affine system
time varying system
quadratic stabilization
tracking
L2 gain
switching law
differential LMIs
observer
system zmienny w czasie
stabilizacja kwadratowa
śledzenie
obserwator
Opis:
We analyze quadratic performance for switched systems which are composed of a finite set of affine time-varying subsystems, where both subsystem matrices and affine vectors are switched, and no single subsystem has desired quadratic performance. The quadratic performance indexes we deal with include stability, tracking and L2 gain. We show that if a linear convex combination of subsystem matrices is uniformly Hurwitz and another convex combination of affine vectors is zero, then we can design a state-dependent switching law (state feedback) and an output-dependent switching law (output feedback) such that the entire switched affine system is quadratically stable at the origin. In the case where the convex combination of affine vectors is nonzero, we show that the tracking control problem can be posed and solved using a similar switching strategy. Finally, we consider the L2 gain analysis problem for the switched affine time-varying systems under state feedback.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 3; 429-440
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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