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Wyświetlanie 1-15 z 59
Tytuł:
Wybrane struktury niezawodnościowe systemów sygnalizacji pożaru dla scenariusza pożarowego i realizacji sprzętowej
Selected structures of reliability structures of fire signaling systems for fire scale and handling equipment
Autorzy:
Klimczak, T.
Paś, J.
Powiązania:
https://bibliotekanauki.pl/articles/310924.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
sygnalizacja pożarowa
system sygnalizacji pożarowej
scenariusz pożarowy
matryca sterowań
fire signaling systems
fire incident scenario
control matrix
Opis:
W artykule przedstawiono zasadę działania i strukturę techniczną elektronicznego systemu bezpieczeństwa - tj. systemu sygnalizacji pożarowej, który eksploatowany jest w budynku nastawni LCS. Budynek zlokalizowany jest na rozległym obszarze kolejowym. Najbardziej istotnym urządzeniem przeciwpożarowym dla scenariusza pożarowego jest system sygnalizacji pożarowej, który pełni role integratora wszystkich urządzeń przeciwpożarowych, technicznych i technologicznych w budynku. Opracowany scenariusz pożarowy realizowany jest w oparciu o adresowalną, mikroprocesorową centralę sygnalizacji pożarowej. Dla wybranej struktury technicznej realizującej założony scenariusz pożarowy zaproponowano określone struktury niezawodnościowe, które umożliwiają określenie dopuszczalnych wartości wskaźników niezawodnościowych dla danego rozwiązania technicznego.
The article presents the operating principle and technical structure of the electronic safety system - ie the fire alarm system which operates the LCS control room. The building is located on a vast railway area. The most important fire safety device for a fire scenario is the fire alarm system, which plays an integral role in all fire, technical and technological equipment in the building. The developed fire scenario is based on an addressable, microprocessor fire alarm panel. For the selected technical structure that implements the assumed fire scenario, certain reliability structures have been proposed that allow for the determination of acceptable reliability levels for a given technical solution.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 956-961, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The theorems of Koenig and Birkhoff and their connection with the minimization of the duration time of the measurements of automatic telecommunication channels
Autorzy:
Perz, Szczepan
Zaremba, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/748569.pdf
Data publikacji:
1982
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Channel models (including quantum), Discrete-time control systems, Hypergraphs, Matrix equations and identities, Matrices of integers, Stochastic matrices
Opis:
.
A problem (P) of minimization of the duration time of the measurements of automatic telecommunication channels is considered. P is a discrete optimization problem solved by graph theory methods. It is defined by (i)-(v), where: (i) for each i, 1≤i≤p, and j, 1≤1≤p, there are given k ij channels to be measured between node ”i” and node ”j”; (ii) measurement of one channel lasts one unit; (iii) there are exactly two devices, say A, B, in each node (the case where there is an arbitrary number of devices A, B in each node may be easily reduced to this case); (iv) the channel between node ”i” and node ”j” may be measured only by use of device A being present in node ”i” and device B in node ”j”; (v) in each time both devices A or B may measure only one channel. To solve P, some knowledge of hypergraphs as well as functional analysis (the Krein-Milman theorem) and linear algebra (the Koenig theorem) is necessary. The Koenig theorem is proved in a simple manner similarly as the dual Koenig theorem (which is a new result). As corollaries the Birkhoff theorem about bistochastic matrices and the dual Birkhoff theorem are deduced.
Źródło:
Mathematica Applicanda; 1982, 10, 19
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Safe Control Sensitivity Functions in Matrix Game of Ships
Autorzy:
Lisowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/116375.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
matrix game
matrix game of ships
sensitivity
safe control
sensitivity functions
safe control sensitivity functions
ship control algorithm
Safety at Sea
Opis:
The paper describes the use of matrix game theory for the synthesis of safe control of a ship in collision situations. An analysis of the sensitivity of the ship control algorithm to the inaccuracy of process state information and changes in its parameters was presented. Sensitivity characteristics were compared on the example of the navigational situation in the Kattegat Strait for good and restricted visibility at sea.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 527-532
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling concept of NxM matrix converter under periodic control for dynamic states
Autorzy:
Sieńko, T.
Sobczyk, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/141505.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Matrix converter
control strategy
symmetrical components
equivalent Scheme
Opis:
This paper presents a concept of an NxM Matrix Converter (MC) modeling under periodic control strategy patented in Poland. This strategy allows to change an Nphase input system of voltages and current with the frequency fi to the M-phase output system with the frequency fo, maintaining both systems symmetrical and providing small distortions of voltage and current waveforms at rather high frequencies. In this paper the control strategy is extended for dynamic states when one of the frequencies is changed. Matrix converter equations have been derived using the constrain matrix, which is determined by the switch states. The equations have the hybrid form of a multi-port circuit. To simplify these equations the symmetrical components of input and output voltages and currents have been applied. As a result, rather simple equations have been found. They can be interpreted to an equivalent scheme. All considerations are illustrated using an exemplary 6H3 matrix converter.
Źródło:
Archives of Electrical Engineering; 2014, 63, 2; 305-315
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensorless Control of Surface Mounted Permanent Magnet Synchronous Motors Using Matrix Converters
Autorzy:
Saltiveri, D.
Arias, A.
Asher, G.
Sumner, M.
Wheeler, P.
Empringham, L.
Silva, C.
Powiązania:
https://bibliotekanauki.pl/articles/262580.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
sensorless control
permanent magnet synchronous motor
matrix converters
Opis:
This paper investigates the influence of the power converter on the performance of Surface Mounted Permanent Magnet Synchronous Motor drives, which employ High Frequency voltage injection to achieve low and zero speed control. Experimental results demonstrate the remarkable performance of the sensor less speed and position control employing the Matrix Converter and the contributions of the Space Modulation Profiling technique. The Matrix Converter has almost zero dead time, which means that behaves almost like an ideal power converter and achieves better results than the conventional Voltage Source Inverter. A comparison of the sensor less technique proposed using both converters is made.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 1; 59-67
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System Identification from Multiple-Trial Data Corrupted by Non-Repeating Periodic Disturbances
Autorzy:
Phan, M. Q.
Longman, R. W.
Lee, S. C.
Lee, J. W.
Powiązania:
https://bibliotekanauki.pl/articles/908209.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
automatyka
robotyka
system identification
disturbance identification
iterative learning control
repetitive control
interaction matrix
Opis:
Iterative learning and repetitive control aim to eliminate the effect of unwanted disturbances over repeated trials or cycles. The disturbance-free system model, if known, can be used in a model-based iterative learning or repetitive control system to eliminate the unwanted disturbances. In the case of periodic disturbances, although the unknown disturbance frequencies may be the same from trial to trial, the disturbance amplitudes, phases, and biases do not necessarily repeat. Furthermore, the system may not return to the same initial state at the end of each trial before starting the next trial. In spite of these constraints, this paper shows how to identify the system disturbance-free dynamics from disturbance-corrupted input-output data collected over multiple trials without having to measure the disturbances directly. The system disturbance-free model can then be used to identify the disturbances as well, for use in learning or repetitive control. This paper represents the first extension of the interaction matrix approach to the multiple-trial environment of iterative learning control.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 2; 185-192
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural contradictions in control system by enterprises as function of associate administrative decisions
Autorzy:
Kalyuzhna, N.
Golovkova, K.
Powiązania:
https://bibliotekanauki.pl/articles/411333.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
control system
administrative decision
algorithm
structural contradiction
morphological matrix
Opis:
The key role of organizationally-functional structure improvement of management is reasonable in the increase of efficiency of preparation processes, acceptance and realization of administrative decisions on an enterprise. The algorithm of structural exposure contradictions is offered in control system by an enterprise. The morphological matrix of description of structural contradiction as functions of associate administrative decisions is formed. Sources 22.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2013, 2, 3; 33-40
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global and local planning of ship route using MATLAB and Simulink
Autorzy:
Kupraty, O.
Tomara, M.
Powiązania:
https://bibliotekanauki.pl/articles/24201406.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
safety at sea
global planning
local planning
marine autonomous surface ship
device control
Scenario Matrix
path matrix
route matrix
Opis:
This article considers a new method of decomposing the ship route into global and local planning using MATLAB and Simulink developed by the authors. The authors propose to create a program code in MATLAB and operate it into Simulink. Wherein, the corrective coefficients were written in MATLAB. Such trajectories are constructed as a set of points, collected into the special matrix. In determining of the angle value of the rudder was used the ship’s turning ability such as: high (HG), middle (MD) or low (LW) with regard to passage area. Moreover, in the article were analyzed and calculated the ship rudder effectiveness for Proportional-Integral-Derivative (PID) control. The paper is devoted to the problem of safety navigation. First of all is the task of planning the path: the trajectory of the vessel’s movement in the local water area. The purpose of planning the vessel trajectory in the local water area is to ensure navigation safety due to marine traffic and environmental conditions. One of the tasks of the present work is controlling following a desired trajectory. The article notes affect of the vessel motion deviation into control process.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 205--215
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predictive current control of three-phase matrix converter with GaN HEMT bidirectional switches
Autorzy:
Nowaszewski, K.
Sikorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/202007.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
predictive control
matrix converter
GaN HEMT
LC filter
bidirectional switch
Opis:
This paper presents an analysis and simulation studies of three-phase matrix converter with GaN HEMT bidirectional switches with predictive control of grid currents and converter output currents. Two methods of grid currents shaping are described and compared. The first method is based on calculations of instantaneous grid reactive power and the second one uses the active power of the load. The analyzed converter works with the resistive-inductive load, and from the grid side the LC filter with damping resistor has been used.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1077-1085
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct predictive control of asynchronous machine torque using matrix converter
Autorzy:
Talavat, V.
Galvani, S.
Hajibeigy, M.
Powiązania:
https://bibliotekanauki.pl/articles/140834.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asynchronous motor
direct predictive control of torque
direct matrix converter
Opis:
The matrix converter is a new generation of power electronic converters and is an alternative to back-to-back converters in applications that dimensions and weight are important. In this paper, a simple control algorithm for a three-phase asynchronous motor based on a direct torque control technique, which is fed through a three-phase direct matrix converter, is presented. For direct matrix converters, 27 switching modes are possible, which using the predictive control technique and for the different modes of the matrix converter, the motor behavior is estimated at the next sampling interval. Then the objective function is determined and the optimal possible mode is selected. Finally, the best switching mode is applied to the direct matrix converter. In order to evaluate the proposed method, simulation of the system in Matlab/Simulink software environment is performed. The results show the effectiveness of the proposed method.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 773-788
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation analysis of extended Kalman filter applied for estimating position and speed of a brushless DC motor
Autorzy:
Chojowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1193591.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
extended Kalman filter
brushless DC motor
covariance matrix
sensorless control
BLDC
Opis:
The purpose of this paper was to present a method for the estimation of the rotor speed and position of brushless DC (BLDC) motor. The BLDC motor state equations were developed, and the model was discretised. Extended Kalman filter has been designed to observe specific states from the state vector, needed for the sensorless control (rotor position) and to determine the speed, which may be useful to use as a feedback for the controller. A test was carried out to determine the noise covariance matrices in a simulation manner.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 145-155
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Persistent bounded disturbance rejection for uncertain time-delay systems
Autorzy:
Sun, M.
Jia, Y.
Powiązania:
https://bibliotekanauki.pl/articles/969712.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
persistent disturbance
time-delay system
linear matrix inequality (LMI)
robust control
Opis:
This paper considers the problem of persistent bounded disturbance rejection for a class of time-delay systems with parametric uncertainty by Lyapunov function and positively invariant set analysis method. Sufficient conditions for internal stability and L1-performance analysis are given in terms of linear matrix inequalities (LMIs). Based on the results, a simple approach to the design of a linear state-feedback controller is presented to stabilize robustly the uncertain time-delay systems and achieve a desired level of disturbance attenuation. All the obtained conditions are delay-dependent. A numerical example is included to illustrate the proposed method.
Źródło:
Control and Cybernetics; 2009, 38, 3; 593-607
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust H∞ control for uncertain neutral time-delay systems with discrete and distributed delays
Autorzy:
Sun, M.
Fu, D.
Powiązania:
https://bibliotekanauki.pl/articles/205639.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
time-delay
linear matrix inequalities
uncertain neutral systems
H[infinity] control
Opis:
In this paper, the robust H∞ control problem is considered for uncertain neutral systems with discrete and distributed tirne delays. Some sumcient conditions on H∞, robust performance analysis are obtained in terms of linear matrix inequalities (LMIs) by using a descriptor model transformation of the system and by applying Park's inequality for bounding cross terms. Based on these conditions the state-feedback H∞ controller is designed. Numerical examples are included to illustrate the proposed method.
Źródło:
Control and Cybernetics; 2011, 40, 1; 25-38
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static and dynamic analysis of multilayer composite plate with piezoelectric elements
Statyka i dynamika wielowarstwowych płyt kompozytowych z elementami piezoelektrycznymi
Autorzy:
Mieszczak, Z.
Krawczuk, M.
Ostachowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/281365.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
piezoelectric layer
composite plate
stress stiffness matrix
finite elements
active control
Opis:
In this paper a model of a composite, multi-layer plate with piezoelectric elements (PZT) has been presented. The influence of the stress stiffness matrix ... on the results otained has been shown. The model has been built up by making use of the finite element method (FEM). The issue of numerical calculations corroborated that the forces, which are formed as a result of activation of piezoelectric elements are considerable. These forces cause changes in static and dynamic charasteristics of the element under consideration. The forces cause changes in displacements, stresses, natural frequencies and mode shapes as well. The changes in static characteristics are bigger than changes in dynamic one, moreover, the changes in the natural frequencies are bigger than those in mode shapes.
W pracy przedstawiono model kompozytowej płyty wielowarstwowej z aktywnymi elementami piezoelektrycznymi (PZT). Model zbudowano w oparciu o metodę elementów skończonych (MES). W pracy pokazano wpływ macierzy sztywności naprężeń początkowych ... na otrzymywane charakterystyki statyczne i dynamiczne analizowanej płyty. Wyniki symulacji numerycznych wykazały, że siły powstałe w efekcie aktywacji elementów piezoelektrycznych są znaczne i powodują zmiany w charakterystykach statycznych i dynamicznych całej konstrukcji; wpływają na wartości przemieszczeń, naprężeń, częstości oraz postaci drgań własnych. Badania numeryczne wykazały, że aktywne elementy piezoelektryczne powodują większe zmiany charakterystyk statycznych niż dynamicznych. Z kolei, uwzględnienie w modelu sztywności naprężeń początkowych w większym stopniu wpływa na zmianę częstości drgań własnych, niż na zmianę postaci drgań własnych.
Źródło:
Journal of Theoretical and Applied Mechanics; 2002, 40, 3; 649-686
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On fault tolerant control structures incorporating fault estimation
Autorzy:
Krokavec, D.
Filasová, A.
Liščinský, P.
Powiązania:
https://bibliotekanauki.pl/articles/229298.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear systems
fault tolerant control
fault estimation
linear matrix inequalities
H∞ norm
H2/H∞ control strategy
Opis:
The paper provides the minimal necessary modifications of linear matrix inequality conditions for the mixed H2/H∞ control design as well as for the augmented observer-based fault estimation to be mutually compatible in joint design of integrated fault estimation and fault tolerant control. To be possible, within this integration, to design the controller which guarantees a pre-specified H∞ norm disturbance attenuation level, the design conditions has to be regularized using the H2 performance index and, moreover, augmented fault observer must be of enforced dynamics. Analyzing the ambit of performances given on the mixed H2/H∞ design, the joint design conditions are formulated as a minimization problem subject to convex constraints expressed by a system of LMIs. The feasibility of the conditions is demonstrated by a numerical example.
Źródło:
Archives of Control Sciences; 2016, 26, 4; 453-469
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 59

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