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Tytuł:
Fault tolerant control of a PMSM drive in the selected emergency conditions
Autorzy:
Siembab, K.
Powiązania:
https://bibliotekanauki.pl/articles/376452.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
PMSM
PMSM drive
fault-tolerant inverter
FTC
Fault Tolerant Control
Opis:
The paper describes an investigation of fault tolerant control strategies for permanent magnet synchronous motor (PMSM) driven by a fault-tolerant inverter. The inverter is a topology-modified inverter with fault-tolerant capability, which can be configured as the standard 3-phase 6-switch inverter and reconfigured as 3-phase 4-switch or 2-phase 4-switch inverter under the fault condition. By analyzing operating principle of a fault-tolerant inverter and the mathematical model of PMSM, fault tolerant control algorithms are investigated. There is a conclusion that three phase stator windings of PMSM can be effectively operated by controlling only two phase currents. Simulation results show the validity of the proposed methods.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 75; 165-172
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Діалогічність у художньому дискурсі: толерантний і атолерантний регістр текстової комунікації
Dialogicality in the Artistic Discourse: Tolerant and A-Tolerant Registers of Text Communication
Autorzy:
Шабат-Савка, Світлана
Powiązania:
https://bibliotekanauki.pl/articles/2031465.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dialogicality
dialogue
communicative intention
addressant
addressee
tolerant and a-tolerant communication registers
Źródło:
Slavia Orientalis; 2020, LXIX, 1; 143-155
0037-6744
Pojawia się w:
Slavia Orientalis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
All metric bases and fault-tolerant metric dimension for square of grid
Autorzy:
Saha, Laxman
Basak, Mithun
Tiwary, Kalishankar
Powiązania:
https://bibliotekanauki.pl/articles/2048644.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
code
resolving set
metric dimension
fault-tolerant resolving set
fault-tolerant metric dimension
Opis:
For a simple connected graph G = (V,E) and an ordered subset W = {w1, w2, . . . , wk} of V , the code of a vertex v ∈ V , denoted by code(v), with respect to W is a k-tuple (d(v, w1), . . . , d(v, wk)), where d(v, wt) represents the distance between v and wt. The set W is called a resolving set of G if code(u) ≠ code(v) for every pair of distinct vertices u and v. A metric basis of G is a resolving set with the minimum cardinality. The metric dimension of G is the cardinality of a metric basis and is denoted by β(G). A set F ⊂ V is called fault-tolerant resolving set of G if F \ {v} is a resolving set of G for every v ∈ F. The fault-tolerant metric dimension of G is the cardinality of a minimal fault-tolerant resolving set. In this article, a complete characterization of metric bases for G2 mn has been given. In addition, we prove that the fault-tolerant metric dimension of G2 mn is 4 if m + n is even. We also show that the fault-tolerant metric dimension of G2 mn is at least 5 and at most 6 when m + n is odd.
Źródło:
Opuscula Mathematica; 2022, 42, 1; 93-111
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boron stress exposes differential antioxidant responses in maize cultivars (Zea mays L.)
Autorzy:
Hamurcu, M.
Khan, M.
Pandey, A.
Avsaroglu, Z.
Elbasan, F.
Gezgin, S.
Powiązania:
https://bibliotekanauki.pl/articles/1192519.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
antioxidant
boron stress
maize
biochemical analysis
susceptible
tolerant
Opis:
Boron stress is largely influencing the growth and yield of crop plants all around the world. In this scenario, identification of the genotypes that are tolerant to boron stress, understanding the mechanisms behind the tolerance and their application in the breeding programs can open new pathways towards dealing with this global stress. Focusing on this, we compared the differences in the physiological and biochemical responses of two hybrid maize (Zea mays L.) cultivars, boron tolerant RX 770 and boron susceptible TTM 8119. Both genotypes were subjected to four different B treatments, 0, 2.5, 25 and 50 mg L-1 B. Samples were collected before the application, after 5 days of treatments and 10 days of treatments. Root shoot lengths, dry weights, malondialdehyde (MDA), proline content and activity of antioxidant enzymes were evaluated for different harvest periods. The aim of the study was to determine the role of antioxidant enzymes in providing tolerance to maize genotypes towards B stress. Based on the results, it can be concluded that the activity of SOD, APX, POX and GR enzymes may have a significant role in providing resistance to the maize cultivar RX 770 towards B toxicity, especially at the early stages of plant development. The comparison of the physiological and biochemical mechanism of the tolerant maize genotype with the susceptible one in the presence of the boron stress may provide deep understanding useful for the development of new B tolerant maize cultivars.
Źródło:
Journal of Elementology; 2020, 25, 4; 1291-1304
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Oat Varieties Sensitivity to the Impact of Aluminium
Ocena wrażliwości odmian owsa (Avena sativa L) na działanie glinu
Autorzy:
Kubicka, H.
Kopras, W.
Powiązania:
https://bibliotekanauki.pl/articles/389413.pdf
Data publikacji:
2010
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
glin
owies
odmiany
tolerancja
aluminium
oat
varieties
tolerant
Opis:
In this work, the influence of aluminium on the germination and growth of 9 oat varieties was researched The experiment was carried out in hydroponic cultures and four concentrations of aluminium were applied. The selected varieties of oat reacted to aluminium in various ways. Aluminium at concentrations of 100 and 200 M reduced the growth of roots to the highest degree, however, its influence on the growth of shoots was negligible. A 75 M concentration of aluminium had no effect on the growth of seedlings of chosen oat varieties in comparison with control. Amongst the assessed varieties of oat the following varieties were most tolerant to the toxic influence of aluminium: Flemingsprofi and Bohun at the lowest concentration (75 M) as well as Borowiak and Akt at higher concentrations (100 and 200 M). The obtained results will be used for cultivation selection in given areas.
W pracy badano wpływ glinu na kiełkowanie i wzrost siewek 9 odmian owsa, w kulturach hydroponicznych, stosując cztery stężenia tego metalu. Wybrane odmiany owsa zróżnicowanie reagowały na jego działanie. W najwyższym stopniu glin wpływał na zahamowanie przyrostu długości korzeni w stężeniach 100 i 200 M, zaś nieznacznie na wzrost części nadziemnych. Glin w stężeniu 75 M prawie nie wpływał na wzrost siewek badanych odmian owsa, a nawet stymulował wzrost siewek u odmiany Flemingsprofi. Spośród ocenianych odmian owsa najbardziej tolerancyjne na toksyczne działanie glinu były odmiany: Flemingsprofi – w najniższym stężeniu (75 M) oraz Borowiak i Bohun – w wyższych (100 i 200 M). Uzyskane wyniki zostaną wykorzystane przy doborze odpowiednich odmian do uprawy na danym terenie.
Źródło:
Ecological Chemistry and Engineering. A; 2010, 17, 10; 1257-1261
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on magnetron-sputtered zirconium-silicide coatings deposited on zirconium alloy for the enhancement of their high-temperature oxidation resistance
Autorzy:
Starosta, Wojciech
Semina, Viera K.
Smolik, Jerzy
Waliś, Lech
Rydzewski, Michał
Sartowska, Bożena
Powiązania:
https://bibliotekanauki.pl/articles/146247.pdf
Data publikacji:
2020
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
accident tolerant fuels
zirconium-silicide coatings
magnetron sputtering
Opis:
Zirconium alloys used widely in nuclear industry as fuel claddings are prone to violent oxidation in water steam atmosphere in the case of loss of coolant accident (LOCA). Accompanying generation of large quantities of heat and explosive gaseous hydrogen may lead to destruction of nuclear core. As the safety of nuclear installations is of primary importance, intensive research works are conducted on the development of so-called accident tolerant fuels much less prone to oxidation. In this paper, the application of external zirconium-silicide coatings deposited by magnetron sputtering is proposed. The preliminary results of their synthesis and studies of air oxidation properties at elevated temperatures are presented.
Źródło:
Nukleonika; 2020, 65, 3; 73-79
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systematic fault tolerant control based on adaptive Thau observer estimation for quadrotor UAVs
Autorzy:
Cen, Z.
Noura, H.
Younes, Y. A.
Powiązania:
https://bibliotekanauki.pl/articles/329914.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
systematic fault tolerant control
fault estimation
adaptive Thau observer
fault tolerant capacity boundaries
time varying fault
sterowanie tolerujące uszkodzenia
estymacja błędu
Opis:
A systematic fault tolerant control (FTC) scheme based on fault estimation for a quadrotor actuator, which integrates normal control, active and passive FTC and fault parking is proposed in this paper. Firstly, an adaptive Thau observer (ATO) is presented to estimate the quadrotor rotor fault magnitudes, and then faults with different magnitudes and time-varying natures are rated into corresponding fault severity levels based on the pre-defined fault-tolerant boundaries. Secondly, a systematic FTC strategy which can coordinate various FTC methods is designed to compensate for failures depending on the fault types and severity levels. Unlike former stand-alone passive FTC or active FTC, our proposed FTC scheme can compensate for faults in a way of condition-based maintenance (CBM), and especially consider the fatal failures that traditional FTC techniques cannot accommodate to avoid the crashing of UAVs. Finally, various simulations are carried out to show the performance and effectiveness of the proposed method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 159-174
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced Reliability for Winding Machine via New Fault Tolerant Control Based on RST-Backstepping Controller
Autorzy:
Haouari, Fouad
Messekher, Salaheddine
Bali, Noureddine
Tadjine, Mohamed
Boucherit, Mohamed Seghir
Powiązania:
https://bibliotekanauki.pl/articles/1955988.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
winding machine
fault tolerant control
backstepping control
RST control
Opis:
Due to the external disturbances, model uncertainties, strong coupling, and occurred faults, the winding machine presents a great control challenge. In order to deal with these problems, this paper presents the formulation of a novel scheme of fault tolerant control (FTC) for three-motor web-winding systems; it is concerned with the nonlinear robust backstepping control based on the combination of RST and backstepping controllers where the process is modelled by a nonlinear model. The main contribution of the paper is that the approach developed here summarises the performance of RST and backstepping controllers in order to design a robust controller capable of eliminating external disturbances and sensor faults affecting the system. The stability of the whole system is proven using the Lyapunov theory. Finally, analysis in comparison with the conventional backstepping controller and simulations in the MATLAB environment are accomplished to confirm the efficiency of the proposed method.
Źródło:
Power Electronics and Drives; 2021, 6, 41; 229-241
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compensation methods of current and speed sensor faults for a vector controlled induction motor drive system
Autorzy:
Klimkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/1193297.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
DFOC
speed sensor
current sensor
detector
fault tolerant drive
Opis:
Chosen speed and current sensor fault detectors for a vector controlled induction motor drive system have been presented. Systems based on the artificial intelligence (neural network) and simple algorithmic systems were analyzed and tested in various drive conditions. The influence of chosen sensor faults on performance of the drive system has been presented. The compensation strategy was proposed and tested. A fault tolerant drive, based on hardware redundancy, has been developed and presented. Simulation and experimental results are obtained in direct field oriented control algorithm (DFOC) on the laboratory set-up with rapid prototyping card Micro Lab Box DS1202 by dSpace.
Źródło:
Power Electronics and Drives; 2017, 2, 37/1; 57-69
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effectiveness of nanoatrazine in post-emergent control of the tolerant weed Digitaria insularis
Autorzy:
Sousa, B.T.
Pereira, A.E.S.
Fraceto, L.F.
De Oliveira, H.C.
Dalazen, G.
Powiązania:
https://bibliotekanauki.pl/articles/2082785.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
atrazine
chemical control
nanoherbicide
nanotechnology
sourgrass
tolerant
weed control
Opis:
Digitaria insularis (sourgrass) is a monocotyledon weed of difficult control and high in- vasive behavior. Atrazine is widely applied in the Americas to control weeds in maize cul- ture, but its efficiency against D. insularis is limited. The incorporation of atrazine into poly(epsilon-caprolactone) nanocapsules increased the herbicidal activity against suscep- tible weeds; however, the potential of this nanoformulation to control atrazine-tolerant weeds including D. insularis has not yet been tested. Here, we evaluated the post-emergent herbicidal activity of nanoatrazine against D. insularis plants during initial developmental stages. The study was carried out in a greenhouse, using pots filled with clay soil. Plants with two or four expanded leaves were treated with conventional or nanoencapsulated at- razine at 50 or 100% of the recommended dosage (1,000 or 2,000 g ∙ ha −1 ), followed by the evaluation of physiological, growth, and control parameters of the plants. Compared with conventional herbicide, both dosages of nanoatrazine induced greater and faster inhibition of D. insularis photosystem II activity at both developmental stages. Atrazine nanoencap- sulation also improved the control of D. insularis plants, especially in the stage with two expanded leaves. In addition, nanoatrazine led to higher decreases of dry weight of four- leaved plants than atrazine. The use of the half-dosage of nanoatrazine was equally or more efficient in affecting most of the evaluated parameters than the conventional formulation at full dosage. Overall, these results suggest that the nanoencapsulation of atrazine potenti- ated its post-emergent herbicidal activity against D. insularis plants at initial developmental stages, favoring the control of this atrazine-tolerant weed.
Źródło:
Journal of Plant Protection Research; 2020, 60, 2; 185-192
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active fault-tolerant control design for Takagi-Sugeno fuzzy systems
Autorzy:
Dziekan, L.
Witczak, M.
Korbicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/202326.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fault-tolerant control
state estimation
observers
fault diagnosis
convergence
Opis:
In this paper, a virtual actuator-based active fault-tolerant control strategy is presented. After a short introduction to Takagi-Sugeno fuzzy systems, it is shown how to design a fault-tolerant control strategy for this particular class of non-linear systems. The key contribution of the proposed approach is an integrated fault-tolerant control design procedure of fault identification and control within an integrated fault-tolerant control scheme. In particular, fault identification is implemented with the suitable state observer. While, the controller is implemented in such a way that the state of the (possibly faulty) system tracks the state of a fault-free reference model. Consequently, the fault-tolerant control stabilizes the possibly faulty system taking into account the input constraints and some control objective function. Finally, the last part of the paper shows a comprehensive case study regarding the application of the proposed strategy to fault-tolerant control of a twin-rotor system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 1; 93-102
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Friction compensation in nonlinear dynamical systems using fault-tolerant control methods
Autorzy:
Bonfè, M.
Castaldi, P.
Preda, N.
Simani, S.
Powiązania:
https://bibliotekanauki.pl/articles/327170.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
fault-tolerant control
friction compensation
nonlinear systems
differential geometry
Opis:
This paper describes the application of differential geometry and nonlinear systems analysis to the estimation of friction effects in a class of mechanical systems. The proposed methodology relies on adaptive filters, designed with a nonlinear geometric approach to obtain the disturbance de-coupling property, for the estimation of the friction force. Thanks to accurate estimation, friction effects are compensated by injecting the on-line estimate of friction force to the control action calculated by a standard linear state feedback. The inverted pendulum on a cart is considered as an application example and the proposed approach is compared with a commonly used friction compensation strategy, based on an explicit model of the friction force.
Źródło:
Diagnostyka; 2013, 14, 4; 13-19
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on topology of a novel three-phase four-leg fault-tolerant NPC inverter
Autorzy:
Zhang, Baoge
Ping, Shanyan
Long, Yyi
Jiao, Yyuemin
Wu, Bboxiang
Powiązania:
https://bibliotekanauki.pl/articles/2086722.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fault tolerant operation
midpoint potential equilibrium
NPC inverter
topology reconstruction
Opis:
Diode neutral point clamped (NPC) three-level converters have been widely used in recent years. Aiming at the problems of the high device failure rate and unstable neutral point potential of NPC three-level converters, an NPC three-level circuit with fourth bridge arm redundancy is proposed based on the traditional NPC three-level converter. The redundant fourth bridge arm is used to realize the function of stabilizing voltage when there is no fault and replacing the fault half-bridge arm to maintain the continuous operation of the converter when there is a fault. By analyzing the working principle of space vector pulse width modulation (SVPWM) and the power loss of the switch, it is of particular significance to the design and control of NPC three-level converters in the future. Matlab/Simulink verifies the feasibility of the fault-tolerant circuit structure.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 489--506
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the Generalization Ability of Neuro-Fuzzy Systems by e-Insensitive Learning
Autorzy:
Łęski, J.
Powiązania:
https://bibliotekanauki.pl/articles/908037.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
informatyka
fuzzy systems
neural networks
tolerant learning
generalization control
robust methods
Opis:
A new learning method tolerant of imprecision is introduced and used in neuro-fuzzy modelling. The proposed method makes it possible to dispose of an intrinsic inconsistency of neuro-fuzzy modelling, where zero-tolerance learning is used to obtain a fuzzy model tolerant of imprecision. This new method can be called e-insensitive learning, where, in order to fit the fuzzy model to real data, the e-insensitive loss function is used. e-insensitive learning leads to a model with minimal Vapnik-Chervonenkis dimension, which results in an improved generalization ability of this system. Another advantage of the proposed method is its robustness against outliers. This paper introduces two approaches to solving e-insensitive learning problem. The first approach leads to a quadratic programming problem with bound constraints and one linear equality constraint. The second approach leads to a problem of solving a system of linear inequalities. Two computationally efficient numerical methods for e-insensitive learning are proposed. Finally, examples are given to demonstrate the validity of the introduced methods.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 3; 437-447
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of rotor position sensor fault tolerant control in electric vehicle with PM BLDC motor drives
Autorzy:
Skóra, M.
Powiązania:
https://bibliotekanauki.pl/articles/140658.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PM BLDC motor
Hall effect sensor
fault tolerant drive
ZOA
electric vehicle
Opis:
In order to develop a PM BLDC motor control system, which will be tolerant of selected faults, simulation work was first performed and then verified on a universal test stand. The results were published in earlier works. The next stage of works was the implementation of previously developed algorithms on the target research test stand – in this case, the prototype vehicle. This last stage of the laboratory work has been presented in this article, i.e. it has been presented the results of experimental research related to the reproduction of rotor angle position, used after the detection of a rotor position sensor fault. A new test stand with the laboratory prototype of a vehicle with two PM BLDC motors is presented. A zeroth-order algorithm (ZOA) was used as a fault compensation method. The effectiveness and usefulness of the previously proposed methods have been confirmed.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 725-738
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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