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Wyświetlanie 1-100 z 165
Tytuł:
Comparison of four state observer design algorithms for MIMO system
Autorzy:
Vinodh, K. E.
Jovitha, J
Ayyappan, S.
Powiązania:
https://bibliotekanauki.pl/articles/229209.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
luenberger observer
Kalman observer
unknown input observer
sliding mode observer
Opis:
A state observer is a system that models a real system in order to provide an estimate of the internal state of the system. The design techniques and comparison of four different types of state observers are presented in this paper. The considered observers include Luenberger observer, Kalman observer, unknown input observer and sliding mode observer. The application of these observers to a Multiple Input Multiple Output (MIMO) DC servo motor model and the performance of observers is assessed. In order to evaluate the effectiveness of these schemes, the simulated results on the position of DC servo motor in terms of residuals including white noise disturbance and additive faults are compared.
Źródło:
Archives of Control Sciences; 2013, 23, 2; 243-256
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-layer observer as new structure for state estimation in linear systems
Autorzy:
Bernat, J.
Kołota, J.
Superczyńska, P.
Stępień, S.
Powiązania:
https://bibliotekanauki.pl/articles/140374.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Luenberger observer
Multi Observer
electric DC motor
Opis:
A new structure to design observers for linear systems is presented in this work. The key step is the construction of two layers where the first consists of multiple observers and the second connects them providing the weighted estimation state. The main difficulty is to find a new feedback which is responsible for control weights. To define observation law, we rely on multi observers from the first layer. The proposed structure significantly improves the transient characteristics of the observation process, which is shown in illustrative examples.
Źródło:
Archives of Electrical Engineering; 2017, 66, 3; 507-521
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of viewing conditions on cross-media color matching
Autorzy:
Huang, Min
He, Ruili
Guo, Chunli
Shi, Chunjie
Cui, Guihua
Luo, Ming Ronnier
Melgosa, Manuel
Powiązania:
https://bibliotekanauki.pl/articles/173710.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
observer variability
observer metamerism
cross-media color experiment
color matching
Opis:
We investigated observer metamerism under a variety of viewing conditions, in a set of color-matching experiments using displays and printed color samples under specific light sources. A selection was made of light sources with different illuminances, spectral power distributions, and correlated color temperatures, as well as displays with different sets of primaries. A panel of 157 observers with normal color vision and ages between 20 and 59 years old performed 5465 visual color matches around 9 different color centers. The results from the simulated and real experiments were quite different. Specifically, the mean color difference from the mean changed with experimental viewing conditions, ranging from 0.73 to 1.64 CIELAB units (average 0.99 CIELAB units) in simulated experiments, and from 3.12 to 4.03 CIELAB units (average 3.55 CIELAB units) in real experiments. In real experiments, observers’ variability reduced for light sources with high illuminance and high correlated color temperature. Spectral power distributions affected observer metamerism, but the role played by the primaries of the two displays employed was unclear.
Źródło:
Optica Applicata; 2019, 49, 4; 627-640
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real-time implementation of an interconnected observer design for p-cells chopper
Autorzy:
Laidi, K.
Benmansour, K.
Ferdjouni, A.
Bouchhida, O.
Powiązania:
https://bibliotekanauki.pl/articles/141378.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obserwator
switching modes
zasilanie
p-cell chopper
observer design
interconnected observer
Opis:
This paper deals with an observer design for a p-cell chopper. The goal is to reduce drastically the number of sensors in such system by using an observer in order to estimate all the capacitor voltages. Furthermore, considering an instantaneous model of a p-cell chopper, an interconnected observer is designed in order to estimate the capacitor voltages. This is realized by using only the load current measurement. Simulation results are given in order to illustrate the performance of such observer. To demonstrate the validity of our approach, experimental results based on Digital Signal Processor (DSP) are presented.
Źródło:
Archives of Electrical Engineering; 2010, 59, 1-2; 5-20
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An interval observer design for uncertain nonlinear systems based on the T-S fuzzy model
Autorzy:
Menasria, Y.
Bouras, H.
Debbache, N.
Powiązania:
https://bibliotekanauki.pl/articles/229225.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
T-Smodel
T-S proportional observer
interval observer
time-varying systems
Opis:
A new approach to build an interval observer for nonlinear un certain systems is presented in this paper. Nonlinear systems modeled in the Takagi-Suge no (T-S) form are studied. A T-S proportional observer is first issued by pole-placement and LMI tools. Secondly, time-varying change of coordinates for each dynamic state estimation error is used to design an interval observer. The system state bounds are then directly deduced.
Źródło:
Archives of Control Sciences; 2017, 27, 3; 397-407
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis and design of state estimated controller for delay fuzzy systems with parameter
Autorzy:
Hadj Taieb, Nizar
Hammami, Mohamed Ali
Delmotte, François
Powiązania:
https://bibliotekanauki.pl/articles/2175116.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
time-delay systems
observer
stabilization
Opis:
This paper deals with the problem of stabilization by an estimated state feedback for a family of nonlinear time-delay Takagi-Sugeno fuzzy parameterized systems. The delay is supposed to be constant where the parameter-dependent controls laws are used to compensate the nonlinearities which are formulated in terms of linear matrix inequalities (LMIs). Based on the Lyapunov-Krasovskii functionals, global exponential stability of the closed-loop systems is achieved. The controller and observer gains are able to be separately designed even in the presence of modeling uncertainty and state delay. Finally, a numerical example is given to show the applicability of the main result.
Źródło:
Archives of Control Sciences; 2022, 32, 4; 709--731
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive observer-based fault estimation for a class of Lipschitz nonlinear systems
Autorzy:
Oucief, N.
Tadjine, M.
Labiod, S.
Powiązania:
https://bibliotekanauki.pl/articles/229517.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinear adaptive observer
fault estimation
strictly positive real
Lipschitz systems
observer matching condition
LMI
Opis:
Fault input channels represent a major challenge for observer design for fault estimation. Most works in this field assume that faults enter in such a way that the transfer functions between these faults and a number of measured outputs are strictly positive real (SPR), that is, the observer matching condition is satisfied. This paper presents a systematic approach to adaptive observer design for joint estimation of the state and faults when the SPR requirement is not verified. The proposed method deals with a class of Lipschitz nonlinear systems subjected to piecewise constant multiplicative faults. The novelty of the proposed approach is that it uses a rank condition similar to the observer matching condition to construct the adaptation law used to obtain fault estimates. The problem of finding the adaptive observer matrices is formulated as a Linear Matrix Inequality (LMI) optimization problem. The proposed scheme is tested on the nonlinear model of a single link flexible joint robot system.
Źródło:
Archives of Control Sciences; 2016, 26, 2; 245-259
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-proportional full-order Luenberger observers of induction motors
Autorzy:
Białoń, T.
Lewicki, A.
Pasko, M.
Niestrój, R.
Powiązania:
https://bibliotekanauki.pl/articles/141473.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Luenberger observer
induction motor
pole placement
Opis:
The paper recapitulates recently conducted investigations of non-proportional Luenberger observers, applied to reconstruction of state variables of induction motors. Three structures of non-proportional observers are analyzed, a proportional-integral observer, modified integral observer and observer with integrators. Criteria for gain selection of the observer are described, classical ones based on poles, as well as additional, increasing observer’s robustness. Fulfilment of the presented criteria can be ensured with the three proposed methods for gain selection, two analytical, based on dyadic transformation and one based on optimization.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 925-937
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the state estimation for nonlinear continuous-time fuzzy systems
Autorzy:
Delmotte, Francois
Hammami, Mohamed Ali
Rettab, Nour El Houda
Powiązania:
https://bibliotekanauki.pl/articles/2106502.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuzzy systems
Lipschitz analysis
observer design
Opis:
A large class of nonlinear systems can be represented or well approximated by Takagi-Sugeno (TS) fuzzy models, which in theory can approximate a general nonlinear system to an arbitrary degree of accuracy. The TS fuzzy model consists of a fuzzy rule base. The rule antecedents partition a given subspace of the model variables into fuzzy regions, while the consequent of each rule is usually a linear or affine model, valid locally in the corresponding region. In this paper, the observer design problem for a T-S fuzzy system subject to Lypschitz perturbation is investigated. First, an observer of Kalman type is designed to estimate the unknown system states. Then, the class of one-sided Lipschitz for a TS fuzzy system subject to a sufficient condition on the bound is studied. The challenges are discussed and some analysis oriented tools are provided. An example is given to show the applicability of the main result.
Źródło:
Archives of Control Sciences; 2022, 32, 1; 57--72
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control system design for dynamic positioning using vectorial backstepping
Autorzy:
Witkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/359838.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
dynamic positioning
backstepping
nonlinear passive observer
Opis:
The problem of synthesis a dynamic positioning system for low frequency model of surface vessel was considered in this paper. The recursive vectorial backstepping control design was used to keep a fixed position and heading in presence of wave disturbances. The passive observer was introduced to smooth the measurements and to estimate the velocities needed for the control algorithm. The computer simulation results were given to demonstrate the effectiveness of that combination of controller-observer system to compensate environmental disturbances.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 182-187
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two Observer-Based Tracking Algorithms for a Unicycle Mobile Robot
Autorzy:
Jakubiak, J.
Lefeber, E.
Tchoń, K.
Nijmeijer, H.
Powiązania:
https://bibliotekanauki.pl/articles/908499.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
robotyka
observer
trajectory tracking
mobile robot
Opis:
A trajectory tracking problem for the three-dimensional kinematic model of a unicycle-type mobile robot is considered. It is assumed that only two of the tracking error coordinates are measurable. By means of cascaded systems theory we develop observers for each of the error coordinates and show the K-exponential convergence of the tracking error in combined closed-loop observer-controller systems. The results are illustrated with computer simulations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 4; 513-522
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Observer-Based Fault Detection Structure for Unknown Systems using Input–Output Measurements: Practical Application to BLDC Drive
Autorzy:
Eissa, M. Abdullah
Darwish, R. R.
Bassiuny, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/1193710.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fault
sensor
measurements
observer
BLDC motor
Opis:
Industrial systems serve us in all areas of life. Faults may result in economic loss and wasting energy. Detecting the onset of faults, and determining their location are important engineering tasks. An important class of fault detection (FD) and diagnosis methods utilizes the mathematical model of the monitored system. But, the parameters required for mathematical modelling are limited or unavailable for the most real industrial engineering applications. Observer-based FD is one of the main approaches to FD and identification. At the same time, the traditional observer’s gain calculation required system model parameters. So, this article presents the design of a novel observer for FD purposes using the input–output measurements of the system with unknown parameters. This proposed observer’s design considers observer’s gain tuning, regardless of the mathematical representation of the plant. This the new feature that distinction our observer will facilitate the implementation of FD systems for many unknown parameters industrial systems. The effectiveness of the proposed observer is verified by experimental application to BLDC motor and compared with classical Luenberger observer. The experimental and comparison results prove feasibility and effectiveness of the proposed observer for FD purposes.
Źródło:
Power Electronics and Drives; 2019, 4, 39; 215-224
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An exponential observer and a controller for a class of nonlinear systems
Autorzy:
Hammami, M. A.
Zribi, M
Kallel, J
Powiązania:
https://bibliotekanauki.pl/articles/229713.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonlinear system
observer
stability
controller
stabilization
Opis:
In this paper, we study the observer design problem for a class of nonlinear systems. Specifically, we design an exponential observer for a separately excited DC motor. Moreover, a stabilizing controller is designed for the system to ensure the exponential stability of the solutions toward their desired values. Simulations results show that proposed observer is able to reconstruct the states of the system. In addition, the simulation results indicate that the designed controller works well.
Źródło:
Archives of Control Sciences; 2013, 23, 1; 79-92
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja wzmocnienia obserwatora Luenbergera w układzie predykcyjnego sterowania systemem aktywnego zawieszenia
Luenberger Observer Gain Optimization in Model Predictive Control System for Car Active Suspension
Autorzy:
Maślak, Grzegorz
Orłowski, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/2068639.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
obserwator stanu
sterowanie predykcyjne
optymalizacja obserwatora
zawieszenie aktywne
state observer
model predictive control
observer optimization
active suspension
Opis:
Układy sterowania wykorzystujące regulatory predykcyjne bardzo często wymagają wprowadzenia do ich struktury mechanizmów umożliwiających estymację niedostępnego pomiarowo stanu obiektu. Zależnie od przypadku nieosiągalne mogą być informacje o różnej liczbie zmiennych stanu. Szeroko stosowanymi układami pozwalającymi na uzyskanie niezbędnych informacji o stanie obiektu są obserwator Luenbergera oraz różnego typu filtry Kalmana. Autorzy proponują metodę syntezy obserwatora Luenbergera opartą na optymalizacji wzmocnienia owego obserwatora, przy czym wyznacznik jakości uzyskanego wzmocnienia wykorzystywanego przez optymalizator stanowi ogólna jakość regulacji układu sterowania z regulatorem predykcyjnym. Opracowana metoda pozwala na uzyskanie, z punktu widzenia przyjętego kryterium, obserwatora o właściwościach lepszych niż analogiczny układ, którego syntezę przeprowadzono przy wykorzystaniu równania Sylvestera oraz klasycznego filtru Kalmana, mimo występowania zakłóceń. Metoda zaprezentowana zostanie na przykładzie układu predykcyjnego sterowania systemem aktywnego zawieszenia.
MPC Driven control systems very often are requiring the introduction of a mechanism predicting the state of the object unavailable for measurements. Depending on the case, a different number of state variables will be unobtainable. Widely used systems to obtain essential data of the condition of an object are Luenberger state observer and different types of Kalman filters. The authors propose a new method of Luenberger observer synthesis based on Luenberger gain optimization using performance index corresponding to generalized system performance. The developed method allows us to obtain better-performing observer from the point of view of the adopted criterion, compared to similar estimators derived from the Sylvester equation and classic Kalman filters, even despite the occurrence of disturbances. The developed method will be presented on an example of an active suspension system with MPC.
Źródło:
Pomiary Automatyka Robotyka; 2021, 25, 2; 5--10
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PI observer stability and application in an induction motor control system
Autorzy:
Białoń, T.
Lewicki, A.
Pasko, M.
Niestrój, R.
Powiązania:
https://bibliotekanauki.pl/articles/200301.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
luenberger observer
induction motor
multiscalar control system
Opis:
The paper discusses the problem of stability of a proportional-integral Luenberger observer, designated for the state variables reconstruction of a linear, time-invariant dynamical system. It is proven, that there exists such a class of observed systems, for which the observer is always unstable, independently of its gains. Stability can be provided in every possible case after application of proposed modifications to the structure of the observer. It is proven, that stability of the modified observer depends only on its gains. It is shown, that an induction motor is the exemplary observed system, for which application of the unmodified observer is impossible due to its lack of stability, while the modified observer provides proper operation of the control system. Finally, some experimental results are presented, obtained in the multiscalar control system of the induction motor, equipped with the modified proportional-integral observer.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 595-598
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The design of ship autopilot by applying observer – based feedback linearization
Autorzy:
Zwierzewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/259972.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship autopilot design
feedback linearization
nonlinear observer
Opis:
The paper considers the problem of ship autopilot design based on Bech’s model of the vessel. Since the model is highly nonlinear and some of the state vector coordinates are unavailable, the control system synthesis is performed by means of an output feedback linearization method combined with a nonlinear observer. The asymptotic stability of the overall system has been proven, including the asymptotic stability of the system internal dynamics. The performed simulations of the ship course-changing process have confirmed a high performance of the proposed controller. It has been emphasized that for its practical usability the system robustification is necessary.
Źródło:
Polish Maritime Research; 2015, 1; 16-21
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Adaptive Control Strategy for a Low-Ripple Boost Converter in BLDC Motor Speed Control
Autorzy:
Wang, Haifeng
Zhang, Haili
Powiązania:
https://bibliotekanauki.pl/articles/1955989.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
boost converter
BLDC
harmonics
observer
feedback control
Opis:
Conventional boost converters are widely used for connecting low-voltage power sources and inverters in motor control. However, a large filter capacitor bank is often used to reduce DC-link ripples that occur when an inverter is connected to a boost converter. Otherwise, significant voltage and current perturbations can impact on battery performance degradation and cause torque ripple, speed ripple and vibration in brushless DC (BLDC) motors. To suppress the converter’s DC-link ripple, this paper proposes a new control strategy for boost converter controller to generate low-ripple DC-link voltage or current at different motor speeds. In the proposed method, observers are designed to adaptively estimate the DC-link voltage and current harmonics. The harmonic terms are used as feedback signals to calculate the DC converter’s duty cycle. The entire control model is implemented on an embedded system, and its robustness is verified by simulation and experimental results that show the DC-link voltage and current ripples can be reduced by about 50% and 30%, respectively.
Źródło:
Power Electronics and Drives; 2021, 6, 41; 242-259
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter selection of an adaptive PI state observer for an induction motor
Autorzy:
Białoń, T.
Lewicki, A.
Pasko, M.
Niestrój, R.
Powiązania:
https://bibliotekanauki.pl/articles/201948.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
luenberger observer
induction motor
multiscalar control system
Opis:
The paper discusses problems connected with the parameters selection of the proportional-integral observer, designed for reconstruction of magnetic fluxes and angular speed of an induction motor. The selection is performed in several stages that are focused on different criteria. The first stage consists in selecting observer’s gains and provides desired dynamical properties, taking into consideration immunity to disturbances and parameter variations of observed system. The second stage prevents an observer from DC-offset cumulation and instability. The last stage consists in setting the parameters of a speed adaptation mechanism. The impact of different settings on the properties of an observer is illustrated with experimental results, obtained in the multiscalar control system of an induction motor.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 599-603
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive observer design for systems with incremental quadratic constraints and nonlinear outputs - application to chaos synchronization
Autorzy:
Moysis, Lazaros
Tripathi, Meenakshi
Gupta, Mahendra Kumar
Marwan, Muhammad
Volos, Christos
Powiązania:
https://bibliotekanauki.pl/articles/2106505.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adaptive observer
incremental quadratic constraint
chaos synchronization
Opis:
This work addresses the problem of adaptive observer design for nonlinear systems satisfying incremental quadratic constraints. The output of the system includes nonlinear terms, which puts an additional strain on the design and feasibility of the observer, which is guaranteed under the satisfaction of an LMI, and a set of algebraic constraints. A particular case where the output nonlinearity matches the unknown parameter coefficient is also discussed. The result is illustrated through a numerical example for the chaos synchronization of the Rössler system.
Źródło:
Archives of Control Sciences; 2022, 32, 1; 105--121
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An observer-based control of linear systems with uncertain parameters
Autorzy:
Rachik, M.
Lhous, M.
Powiązania:
https://bibliotekanauki.pl/articles/229793.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
observer-based control
stability
uncertain linear systems
Opis:
In this paper, the observer-based control for a class of uncertain linear systems is considered. Exponential stabilizability for the system is studied and reduced-order observer is discussed. Numerical examples are given to illustrate obtained results.
Źródło:
Archives of Control Sciences; 2016, 26, 4; 565-576
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An observer design for Takagi-Sugeno fuzzy bilinear control systems
Autorzy:
Delmotte, François
Hadj Taieb, Nizar
Hammami, Mohamed Ali
Meghnafi, Houria
Powiązania:
https://bibliotekanauki.pl/articles/27314670.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
fuzzy systems
bilinear systems
stability analysis
observer design
Opis:
In this paper, the observer design problem for a T-S fuzzy bilinear control system is investigated. First, an observer of Kalman type is designed to estimate the system states for the linear case. Then, some new sufficient conditions are derived to show the exponential convergence of the solutions of the error equation for fuzzy bilinear systems. Furthermore, we consider some uncertainties of the system that are bounded and satisfy a certain condition where an observer is designed. Moreover, an application to Van de Vusse system is given.
Źródło:
Archives of Control Sciences; 2023, 33, 3; 631--649
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
You are so kind – and I am kind and smart: Actor – Observer Differences in the Interpretation of On-going Behavior
Autorzy:
Abele, Andrea E.
Bruckmüller, Susanne
Wojciszke, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/430804.pdf
Data publikacji:
2014-12-01
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
actor-observer differences
agency
communion
dual perspective model
Opis:
: The dual perspective model of agency and communion predicts that observers tend to interpret a target’s behavior more in terms of communion than agency, whereas actors interpret their behavior more in terms of agency. The present research for the first time tests this model in real interactions. Previously unacquainted participants had a short conversation and afterwards rated their own behavior (actor perspective) and their interaction partner’s behavior (observer perspective) in terms of agency(self-confident, assertive) and communion(trustworthy, empathic). Supporting the dual perspective model, observers rated the actor’s behavior higher on communion than on agency, and higher on communion than actors themselves did. Findings for actors were more complex: Actors rated their own behavior as more agentic than observers did. However, they also rated their behavior high on communion. We discuss implications for the dual perspective model as well as for (mis)understandings in social interactions.
Źródło:
Polish Psychological Bulletin; 2014, 45, 4; 394-401
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global rational stabilization of a class of nonlinear time-delay systems
Autorzy:
Echi, Nadhem
Ghanmi, Boulbaba
Powiązania:
https://bibliotekanauki.pl/articles/229187.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rational stability
delay system
nonlinear observer
Lyapunov functional
Opis:
The present paper is mainly aimed at introducing a novel notion of stability of nonlinear time-delay systems called Rational Stability. According to the Lyapunov-type, various sufficient conditions for rational stability are reached. Under delay dependent conditions, we suggest a nonlinear time-delay observer to estimate the system states, a state feedback controller and the observer-based controller rational stability is provided. Moreover, global rational stability using output feedback is given. Finally, the study presents simulation findings to show the feasibility of the suggested strategy.
Źródło:
Archives of Control Sciences; 2019, 29, 2; 259-278
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the existence of Luenberger reduced order observer
Autorzy:
Kiritsis, Konstadinos H.
Powiązania:
https://bibliotekanauki.pl/articles/31343936.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Luenberger reduced order observer
necessary and sufficient conditions
Opis:
In this paper the explicit necessary and sufficient conditions for the existence of Luenberger reduced order observer are established. In particular, it is proven that for the given linear time-invariant system of order n, having p linearly independent out- puts and m inputs, a Luenberger observer of order (n − p) can be constructed if and only if the given system is detectable. Further- more, a procedure is given for the construction of the observer. Our approach is based on the properties of real and polynomial matrices.
Źródło:
Control and Cybernetics; 2023, 52, 2; 181-198
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode observers for fault identification in linear systems not satisfying matching and minimum phase conditions
Autorzy:
Zhirabok, Alexey
Zuev, Alexander
Filaretov, Vladimir
Shumsky, Alexey
Powiązania:
https://bibliotekanauki.pl/articles/1409401.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear systems
faults
identification
disturbances
sliding mode observer
Opis:
The paper studies the fault identification problem for linear control systems under the unmatched disturbances. A novel approach to the construction of a sliding mode observer is proposed for systems that do not satisfy common conditions required for fault estimation, in particular matching condition, minimum phase condition, and detectability condition. The suggested approach is based on the reduced order model of the original system. This allows to reduce complexity of sliding mode observer and relax the limitations imposed on the original system.
Źródło:
Archives of Control Sciences; 2021, 31, 2; 253-266
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed fault estimation of multi-agent systems using a proportional-integral observer: A leader-following application
Autorzy:
Farrera, Beltrán
López-Estrada, Francisco-Ronay
Chadli, Mohammed
Valencia-Palomo, Guillermo
Gómez-Peñate, Samuel
Powiązania:
https://bibliotekanauki.pl/articles/330554.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
multiagent systems
fault estimation
state observer
fault observer
linear matrix inequalities
system wieloagentowy
estymacja błędu
obserwator stanu
liniowe nierówności macierzowe
Opis:
This paper proposes a methodology for observer-based fault estimation of leader-following linear multi-agent systems subject to actuator faults. First, a proportional-integral distributed fault estimation observer is developed to estimate both actuator faults and states of each follower agent by considering directed and undirected graph topologies. Second, based on the proposed quadratic Lyapunov equation, sufficient conditions for the asymptotic convergence of the observer are obtained as a set of linear matrix inequalities. Finally, a numerical example is provided to illustrate the proposed approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 3; 551-560
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduced-order perfect nonlinear observers of fractional descriptor discrete-time nonlinear systems
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/330044.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fractional descriptor
nonlinear system
discrete time system
reduced order observer
perfect observer
układ ułamkowy
układ nieliniowy
układ dyskretny
obserwator doskonały
Opis:
The purpose of this work is to propose and characterize fractional descriptor reduced-order perfect nonlinear observers for a class of fractional descriptor discrete-time nonlinear systems. Sufficient conditions for the existence of these observers are established. The design procedure of the observers is given and demonstrated on a numerical example.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 245-251
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State estimators and observers for continuous and discrete linear systems. Part 2. Integral observers for exact state reconstruction
Autorzy:
Byrski, Jędrzej
Byrski, Witold
Powiązania:
https://bibliotekanauki.pl/articles/93152.pdf
Data publikacji:
2019
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
exact state observer
linear system
state observer with minimal norm
dokładny obserwator stanu
układ liniowy
obserwator stanu z minimalną normą
Opis:
In the paper, the exact state observers will be presented. The state estimators and observers can be used in technical processes for many purposes like the fault detection and diagnosis, the implementation of the state controllers, and soft reconstruction of inaccessible for measurements variables of the system. As the standard, for continuous systems the differential estimators of Kalman filter or Luenberger type observer are commonly used. However, if the initial conditions of the real state are unknown, both estimators guarantee only an asymptotic quality of the real state tracking. The paper presents another type of the state observers, which for continuous system have the structure given by two integral operators. Based on measurements of the system input and output signals on some predefined finite time interval T, they can reconstruct the initial state exactly. In on-line version, the exact state reconstruction is performed continuously for every t, based on special procedure executed within two moving windows of width T, on sliding time interval [t-T, t].
Źródło:
Science, Technology and Innovation; 2019, 5, 2; 23-33
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a novel control algorithm for a 6 D.O.F. mobile manipulator based on a robust observer
Autorzy:
Bolandi, H.
Ehyaei, A. F.
Esmaeilzadeh, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/970986.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
robust control
mobile manipulator
generalized-α method
robust observer
Opis:
In this paper a control algorithm based on a design technique named "Robust Damping Control" is introduced. A robust observer is further shown to overcome the problem of using velocity sensors that may degrade the system performance. The proposed controller uses only position measurements and is capable of disturbance rejection in the presence of unknown bounded disturbances without requiring the knowledge of its bound. Moreover, we propose an accurate and fast time integration method to solve the dynamic equations of the mobile manipulator system. The simulation results of a 6 D.O.F. mobile manipulator illustrate the effectiveness of the presented algorithm.
Źródło:
Control and Cybernetics; 2005, 34, 4; 1057-1074
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonadaptive estimation of the rotor speed in an adaptive full order observer of induction machine
Autorzy:
Morawiec, M.
Kroplewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/202062.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
observers
induction machines
speed estimation
adaptive full order observer
Opis:
The article proposes a new method of reproducing the angular speed of the rotor of a cage induction machine designed for speed observers based on the adaptive method. In the proposed solution, the value of the angular speed of the rotor is not determined by the classical law of adaptation using the integrator only by an algebraic relationship. Theoretical considerations were confirmed by simulation and experimental tests.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 973--981
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rogera Penrosea obiektywizacja obserwatora w mechanice kwantowej
The objective status of an observer in quantum mechanics according to Roger Penrose
Autorzy:
Grygiel, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/691132.pdf
Data publikacji:
2009
Wydawca:
Copernicus Center Press
Tematy:
observer
Roger Penrose
quantum mechanics' interpretations
philosophy of physics
Opis:
Unlike in the classical regime, the measurement performed on a quantum system perturbs the state of the system and its properties remain unknown between measurements. Several early interpretations of quantum mechanics suggested that the reduction of the wave vector that occurs in a measurement is effected by a conscious act of an observer. For example, London and Bauer fostered the conviction that it is the act of observation that decides on the fate of the Schrodinger cat. Later developments of quantum mechanical formalism, e.g., decoherence, indicated that there was no need to causally link the mental states of an observer with the purely physical process of a quantum measurement. In particular, the novel quantum models of human brain put forward by Roger Penrose suggest that it is the reduction of the wave vector that causes conscious act of the observer. Although this reversal does not clarify the specifics of the quantum measurement process directly, it illustrates the principle of methodological naturalism whereby externally introduced heuristic postulates are replaced by well justified scientific explanations.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2009, 45; 45-61
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predictive current control for permanent magnet synchronous motor based on internal model control observer
Autorzy:
Tang, Min'at
Wang, Chenyu
Luo, Yinhang
Powiązania:
https://bibliotekanauki.pl/articles/2086720.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
internal model control observer
MPC
PMSM
predictive current control
Opis:
The model predictive current control (MPCC) of the permanent magnet synchronous motor (PMSM) is highly dependent on motor parameters, and a parameter mismatch will cause the system performance degradation. Therefore, a strategy based on an internal model control (IMC) observer is proposed to correct the mismatch parameters. Firstly, based on the MPCC strategy of the PMSM, according to the dynamic model of the PMSM in a rotating orthogonal coordinate system, -axis and -axis current IMC observers are designed, and the stability derivation is carried out. It is proved that the observer can estimate -axis and -axis disturbance components caused by a parameter mismatch without static error. Then, the estimated disturbance component is compensated for by the reference voltage prediction expression. Finally, the effectiveness of the proposed strategy is verified in two different conditions. The experimental results show that the proposed control strategy can effectively compensate for the parameter mismatch disturbance in MPCC for PMSM, improve the dynamic and static performance of the system, and improve the robustness of the system. voltage prediction expression. Finally, the effectiveness of the proposed strategy is verified in two different conditions. The experimental results show that the proposed control strategy can effectively compensate for the parameter mismatch disturbance in MPCC for PMSM, improve the dynamic and static performance of the system, and improve the robustness of the system.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 343--362
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A separation principle for Takagi-Sugeno control fuzzy systems
Autorzy:
Hadj Taieb, N.
Hammami, M. A.
Delmotte, F.
Powiązania:
https://bibliotekanauki.pl/articles/229205.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
T-S model
PDC controller
fuzzy observer
separation principle
Opis:
An important application of state estimation is feedback control: an estimate of the state (typically the mean estimate) is used as input to a state-feedback controller. This scheme is known as observer based control, and it is a common way of designing an output-feedback controller (i. e. a controller that does not have access to perfect state measurements). In this paper, under the fact that both the estimator dynamics and the state feedback dynamics are stable we propose a separation principle for Takagi-Sugeno fuzzy control systems with Lipschitz nonlinearities. The considered nonlinearities are Lipschitz or meets an integrability condition which have no influence on the LMI to prove the stability of the associated closed-loop system. Furthermore, we give an example to ullistrate the applicability of the main result.
Źródło:
Archives of Control Sciences; 2019, 29, 2; 227-245
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional descriptor observers for fractional descriptor continuous-time linear system
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/229221.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional descriptor linear systems
design
full-order
fractional
observer
Opis:
Fractional descriptor full-order observers for fractional descriptor continuous-time linear systems are proposed. Necessary and sufficient conditions for the existence of the observers are established. The design procedure of the observers is demonstrated on two numerical examples.
Źródło:
Archives of Control Sciences; 2014, 24, 1; 27-37
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State estimators and observers for continuous and discrete linear systems. Part 1. Differential asymptotic state estimators
Autorzy:
Byrski, J.
Byrski, W.
Powiązania:
https://bibliotekanauki.pl/articles/93134.pdf
Data publikacji:
2018
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
linear estimator
Kalman filter
Luenberger observer
exact state observer
linear system
estymator liniowy
filtr Kalmana
obserwator Luenbergera
dokładny obserwator stanu
system liniowy
Opis:
In the paper an overview of state estimators and state observers used in linear systems, will be presented. The state estimators and observers can be used in many applications like the state reconstruction for the control purposes or for the diagnosis and fault detection in technical processes or for the virtual measurements of inaccessible variables of the system as well as for the best filtration of the differential equation solution. As the standard most commonly the Kalman filter and Luenberger type observers are used. Although the Kalman filter guarantees optimal filtering quality of the state, reconstructed from the noisy measurements, both Kalman filter and the Luenberger observer guarantee only asymptotic quality of the real state changes and tracking, basing on the current measurements of the system output and input signals. Unfortunately, the value of the estimation error at any moment of time cannot be calculated. The discussion on differences between continuous and two types of discrete Kalman Filter will be presented. This paper is planned to be the introduction to presentation of another type of the state observers which have the structure given by the integral operators. Based on measurements of the system output and input signals on some predefined finite time interval, they can reconstruct, after this interval, the observed state exactly.
Źródło:
Science, Technology and Innovation; 2018, 3, 2; 62-68
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized observer design of index one for descriptor systems with unknown inputs
Autorzy:
Kumar, Abhinav
Gupta, Mahendra Kumar
Powiązania:
https://bibliotekanauki.pl/articles/27312001.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
descriptor systems
DAEs
unknown inputs
state estimation
generalized
observer
index
Opis:
Generalized observers are proposed to relax the existing conditions required to design Luenberger observers for rectangular linear descriptor systems with unknown inputs. The current work is focused on designing index one generalized observers, which can be naturally extended to higher indexes. Sufficient conditions in terms of system operators for the existence of generalized observers are given and proved. Orthogonal transformations are used to derive the results. A physical model is presented to show the usefulness of the proposed theory.
Źródło:
Archives of Control Sciences; 2023, 33, 1; 83--99
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discrete-time Takagi-Sugeno singular systems with unmeasurable decision variables: state and fault fuzzy observer design
Autorzy:
Aitdaraou, Khaoula
Essabre, Mohamed
El Assoudi, Abdellatif
El Yaagoubi, El Hassane
Powiązania:
https://bibliotekanauki.pl/articles/27312012.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
observer design
unmeasurable decision variable
SVD approach
Lyapunov function
LMIs
Opis:
The studied problem in this paper, treat the issue of state and fault estimation using a fuzzy observer in the case of unmeasurable decision variable for Discrete-Time Takagi-Sugeno Singular Sytems (DTSSS). First, an augmented system is introduced to gather state and fault into a single vector, then on the basis of Singular Value Decomposition (SVD) approach, this observer is designed in explicit form to estimate both of state and fault of a nonlinear singular system. The exponential stability of this observer is studied using Lyapunov theory and the convergence conditions are solved with Linear Matrix Inequalities (LMIs). Finally a numerical example is simulated, and results are given to validate the offered approach.
Źródło:
Archives of Control Sciences; 2023, 33, 2; 321--338
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Position tracking systems for AC drives employing forced dynamics control
Autorzy:
Vittek, J.
Gorel, L.
Vavrus, V.
Struharnansky, L.
Powiązania:
https://bibliotekanauki.pl/articles/1193302.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
position control
AC drives
vector control
forced dynamics control
observer
Opis:
Position tracking systems for AC drives offering high robustness to external load torques have been presented. A triple-loop cascade control structure was employed where the inner loop is a stator current control loop and the middle loop is a speed control loop based on the forced dynamic control and respecting vector control principles. Two alternative outer position control loop designs both of which respect prescribed dynamics and settling time of position have been developed. The former system prescribes also time constant of the speed control loop while the latter one respects time constant of speed control system developed independently. To enhance the tracking abilities of both control systems the dynamic lag pre-compensator has been included. Case studies of the both position control systems for time near-optimal control and energy near-optimal control have been presented. The tracking performances of the designed control systems were assessed based on comparisons of the experimental responses with the simulated responses of the ideal closed-loop system.
Źródło:
Power Electronics and Drives; 2017, 2, 37/1; 89-103
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power system state estimation using dispersed particle filter
Autorzy:
Kozierski, P.
Lis, M.
Horla, D.
Powiązania:
https://bibliotekanauki.pl/articles/950942.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
particle filter
power system
state observer
state estimation
dispersed estimation
Opis:
The paper presents a new approach to particle filtering, i.e. Dispersed Particle Filter. This algorithm has been applied to the power system, but it can also be used in other transmission networks. In this approach, the whole network must be divided into smaller parts. As it has been shown, use of Dispersed Particle Filter improves the quality of the state estimation, compared to a simple particle filter. It has been also checked that communication between subsystems improves the obtained results. It has been checked by means of simulation based on model, which has been created on the basis of knowledge about practically functioning power systems.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2014, 8, 3; 35-40
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized PI observer design for descriptor linear system
Autorzy:
Wang, Xin-Tao
Yu, Hai-Hua
Powiązania:
https://bibliotekanauki.pl/articles/229300.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
generalized proportional-integral observer
Sylvester matrix equation
regularity
impulse-freeness
Opis:
A kind of generalized proportional-integral (GPI) observer for descriptor linear systems is introduced. We first propose two complete parametric solutions to generalized Sylvester matrix equation corresponding to the left eigenvector matrices in the case of Jordan form. Then a parametric design approach for the observer is presented. The proposed method provides all parametric expression of the gain matrices and the corresponding finite left eigenvector matrix and guarantees the regularity and impulse-freeness of the expanded error system. Two numerical examples are given to explain the design procedure and illustrate the effectiveness of the proposed method.
Źródło:
Archives of Control Sciences; 2019, 29, 4; 585-601
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Institution of Non-Partisan Election Observers in the Polish Electoral Law
Instytucja społecznych obserwatorów wyborów w polskim prawie wyborczym
Autorzy:
Wrzalik, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1878460.pdf
Data publikacji:
2020-12-31
Wydawca:
Uniwersytet Mikołaja Kopernika w Toruniu. Wydawnictwo UMK
Tematy:
Election Code
electoral law
non-partisan citizen observer
scrutineer
international election observer
Kodeks wyborczy
prawo
wyborcze
obserwator społeczny
mąż zaufania
międzynarodowy obserwator wyborów
Opis:
The paper discusses a new institution in the Polish electoral law – namely, non-partisan citizen election observers. This institution, next to scrutineers and international election observers known previously to the Polish electoral system, is intended as another instrument of social control of the electoral process, increasing reliability and fairness of elections. This new institution was introduced by the Act of 11 January 2018 on amendments to some acts in order to increase participation of citizens in the processes of election and functioning and controlling of certain public bodies. The analysis performed allows to conclude that final evaluation of the role played by non-partisan election observers will be heavily influenced by observation of how this institution is used in actual elections, at least over one full electoral cycle.
Artykuł stanowi omówienie nowej instytucji polskiego prawa wyborczego, jaką są społeczni obserwatorzy wyborów. Instytucja ta, obok znanych polskiemu prawu wyborczemu mężów zaufania oraz międzynarodowych obserwatorów wyborów, stanowić ma kolejny instrument społecznej kontroli procesu wyborczego, wpływając tym samym na zwiększenie rzetelności i uczciwości wyborów. Instytucja ta została wprowadzona ustawą z dnia 11 stycznia 2018 r. o zmianie niektórych ustaw w celu zwiększenia udziału obywateli w procesie wybierania, funkcjonowania i kontrolowania niektórych organów publicznych. Dokonana analiza pozwala na stwierdzenie, że na ocenę społecznych obserwatorów wyborów duży wpływ będzie miała jednak praktyka, na którą potrzebny jest ich udział przynajmniej w pełnym cyklu wyborczym.
Źródło:
Historia i Polityka; 2020, 34 (41); 195-205
1899-5160
2391-7652
Pojawia się w:
Historia i Polityka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Instytucje społecznej kontroli procesu wyborczego po zmianach Kodeksu wyborczego w 2023 r.
Institutions of social control of the electoral process after the amendments to the Electoral Code in 2023
Autorzy:
Pyrzyńska, Agata
Powiązania:
https://bibliotekanauki.pl/articles/50945183.pdf
Data publikacji:
2024-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
man of trust
social election observer
international election observer
election
Electoral Code
mąż zaufania
społeczny obserwator wyborów
międzynarodowy obserwator wyborów
wybory
Kodeks wyborczy
Opis:
The aim of the work is to analyze the status, tasks and powers of entities implementing social control of the electoral process after the changes introduced by the Act of 26 January 2023 amending the Act – Electoral Code. The analysis of the adopted solutions allows us to conclude that most of the changes will concern the position of men of trust, i.e. entities related to election committees, and not entities observing the elections in an impartial manner. According to the new regulations, the position of men of trust will be strengthened in relation to independent social and international observers. The question is whether such a direction of changes is aimed at ensuring the transparency and fairness of the electoral process, or whether it is determined by political considerations. The study uses the formal and legal method to examine changes in the legal position of election observers and the empirical method to verify the potential effects of the adopted solutions.
Celem pracy jest analiza statusu, zadań i uprawnień podmiotów realizujących społeczną kontrolę procesu wyborczego po zmianach dokonanych ustawą z 26 stycznia 2023 r. o zmianie ustawy – Kodeks wyborczy. Analiza przyjętych rozwiązań pozwala na stwierdzenie, że większość zmian dotyczy pozycji mężów zaufania, a zatem podmiotów powiązanych z komitetami wyborczymi, nie zaś podmiotów obserwujących wybory w sposób bezstronny. W myśl nowych regulacji pozycja mężów zaufania uległa wzmocnieniu wobec niezależnych obserwatorów społecznych i międzynarodowych. Pojawia się pytanie, czy taki kierunek zmian ma na celu zapewnienie przejrzystości i uczciwości procesu wyborczego, czy raczej zdeterminowany jest względami o charakterze politycznym. W pracy wykorzystano metodę formalnoprawną dla zbadania zmian w zakresie pozycji prawnej podmiotów obserwujących wybory, a także metodę empiryczną dla zweryfikowania potencjalnych skutków przyjętych rozwiązań.
Źródło:
Athenaeum. Polskie Studia Politologiczne; 2024, 81; 24-42
1505-2192
Pojawia się w:
Athenaeum. Polskie Studia Politologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observer design using a partial nonlinear observer canonical form
Autorzy:
Röbenack, K.
Lynch, A. F.
Powiązania:
https://bibliotekanauki.pl/articles/908388.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wzorzec projektowy
postać kanoniczna
wykrywalność
observer design
canonical form
detectability
Opis:
This paper proposes two methods for nonlinear observer design which are based on a partial nonlinear observer canonical form (POCF). Observability and integrability existence conditions for the new POCF are weaker than the well-established nonlinear observer canonical form (OCF), which achieves exact error linearization. The proposed observers provide the global asymptotic stability of error dynamics assuming that a global Lipschitz and detectability-like condition holds. Examples illustrate the advantages of the approach relative to the existing nonlinear observer design methods. The advantages of the proposed method include a relatively simple design procedure which can be broadly applied.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 3; 333-343
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An observer for magnetic levitation system control based on a coefficient diagram method and backstepping
Autorzy:
Haouari, F.
Bali, N.
Tadjine, M.
Boucherit, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/141513.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
backstepping
coefficients diagram method controller
magnetic levitation system
nonlinear observer
Opis:
In this paper, we propose a robust nonlinear control design concept based on a coefficient diagram method and backstepping control, combined with a nonlinear observer for the magnetic levitation system to achieve precise position control in the existence of external disturbance, parameters mismatch with considerable variations and sensor noise in the case, where the full system states are supposed to be unavailable. The observer converges exponentially and leads to good estimate as well as a good track of the steel ball position with the reference trajectory. A simulation results are provided to show the excellent performance of the designed controller.
Źródło:
Archives of Electrical Engineering; 2018, 67, 2; 403--417
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensorless backstepping control using a Luenberger observer for double-star induction motor
Autorzy:
Chaabane, Hadji
Eddine, Khodja Djalal
Salim, Chakroune
Powiązania:
https://bibliotekanauki.pl/articles/141539.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
backstepping control
double star induction machine (DSIM) drive
Luenberger observer
Opis:
In this paper, we propose sensorless backstepping control of a double-star induction machine (DSIM). First, the backstepping approach is designed to steer the flux and speed variables to their references and to compensate uncertainties. Lyapunov”s theory is used and it demonstrates that the dynamic tracking of trajectories tracking is asymptotically stable. Second, unfortunately, this law control called sophisticated is a major problem which leads to the necessity of using a mechanical sensor (speed, load torque). This imposes an additional cost and increases the complexity of the montage. In practice, this variable is unknown and its measurement is expensive. To restrain this problem we estimate speed and load torque by using a Luenberger observer (LO). Simulation results are provided to illustrate the performance of the proposed approach in high and low variable speeds and load torque disturbance.
Źródło:
Archives of Electrical Engineering; 2020, 69, 1; 101-116
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Core loss resistance impact on sensorless speed control of an induction motor using hybrid adaptive sliding mode observer
Autorzy:
Ayana, Tadele
Wogi, Lelissa
Morawiec, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/27309950.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
induction motor
loss minimization
core loss
adaptive observer
sliding mode controller
Opis:
Induction motors (IMs) experience power losses when a portion of the input power is converted to heat instead of driving the load. The combined effect of copper losses, core losses, and mechanical losses results in IM power losses. Unfortunately, the core losses in the motor, which have a considerable impact on its energy efficiency, are not taken into account by the generally employed dynamic model in the majority of the studies. Due to this, the motor rating often corresponds to the worst-case load in applications, but the motor frequently operates below rated conditions. A hybridized model reference adaptive system (MRAS) with sliding mode control (SMC) is used in this study for sensorless speed control of an induction motor with core loss, allowing the motor to operate under a variety of load conditions. As a result, the machine can run at maximum efficiency while carrying its rated load. By adjusting the -axis current in the reference frame in vector-controlled drives, the system’s performance is enhanced by running the motor at its optimum flux. Regarding the torque and speed of both induction motors with and without core loss, the Adaptive Observer Sliding Mode Control (AOSMC) has been constructed and simulated in this case. The AOSMC with core loss produced good performance when the proposed controller was tested.
Źródło:
Archives of Electrical Engineering; 2023, 72, 4; 895--913
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Simulation of Direct and Indirect Back EMF Sliding Mode Observer for Sensorless Control of PMSM
Autorzy:
Petro, Viktor
Kyslan, Karol
Powiązania:
https://bibliotekanauki.pl/articles/1193886.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
back-EMF sliding mode observer
sensorless control
PMSM
phase-locked loop
Opis:
This article compares two sensorless control algorithms for a permanent magnet synchronous machine (PMSM) based on the back-EMF sliding mode observer (SMO). Indirect SMO (I-SMO) treats the back-EMF voltages as a disturbance. Direct SMO (D-SMO) considers back-EMF voltages as state-space variables. The same phase-locked loop (PLL) is used for both observers for extraction of the rotor position and speed values from the observed back-EMF voltages. In a sensorless control, the observed speed is used as feedback for the PI controller, and the observed position is used in the Park transformations. Both observers have been implemented and tested with standard field-oriented control. Simulation results indicate rather comparable speed and position estimation precision for both, but the D-SMO indicates slightly higher precision in steady-state. Even more, a tuning procedure of the D-SMO is more straightforward when compared to the I-SMO. Thus, the D-SMO was further verified experimentally with the OP 5600 rapid prototyping device and with a 350 W PMSM drive. Experimental results of the D-SMO are included at the end of the paper.
Źródło:
Power Electronics and Drives; 2020, 5, 40; 215-228
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza nieliniowego obserwatora i filtru cząsteczkowego jako estymatorów pozycji statku
Enhancement of posiotioning estimation of vessel
Autorzy:
Jaroś, K.
Witkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/267170.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
Nieliniowy model statku
Particle Filter
Nieliniowy obserwator
Nonlinear observer
Particle Filtering
Opis:
W artykule została przedstawiona analiza porównawcza dokonana pomiędzy dwoma estymatorami pozycji. Analiza ta została przedstawiona na podstawie różnicy pomiędzy wartością estymowaną a rzeczywistą. Badania estymatorów zostały przeprowadzone na podstawie równania kinematyki i dynamiki statku dynamicznie pozycjonowanego. Wartościami wykorzystywanymi w symulacji są pomiary z symulowanego odbiornika GPS i siły wytworzone przez napędy statku w czasie wykonywania manewrów. W artykule zawarto nieliniowy model statku z zakłóceniami w globalnym układzie współrzędnych, oraz dwa estymatory nieliniowy obserwator (NO) i filtr cząsteczkowy (PF) (ang. Particle filter). Badania zostały przeprowadzone w środowisku MATLAB/Simulink z użyciem modeli symulacyjnych. W badaniach wykazano że PF jest lepszym estymatorem niż NO podczas manewru zmiany pozycji statku natomiast sytuacja jest odwrotna podczas utrzymywania stałej pozycji statku.
An estimation of measured variables is very important in dynamic positioning systems of the vessels. There is required to a filtering of the signal environmental noise and the measurements noises to get high-precision estimate of the vessel’s position. The dynamic positioning systems uses a different algorithms for estimating and filtering measured signals. More suitable algorithms of estimating and filtering, allows to obtain an accurate control of the vessel’s position at sea, in seaports and near oil rigs. It improve safety level and decrease fuel consumption. That is the reason why many evaluations and investigations of estimation parameter. The goal of research, described in the paper is which of estimator is most suitable estimation of the vessel’s position. In this paper used three estimator to compare which of this estimation give the better solution in different tasks in dynamic positioning system. To comparison filters in this paper used simulation where the vessel has been used to different tasks. Ship model simulates the signal from the GPS receiver with disturbances and provides information about the force generated by the propellers. These values was used to estimation position of vessel. Studies have shown that PF is a better estimator than NO by tracking the position of a time-varying but the opposite is true for estimating the position of the invariant over time.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2015, 47; 71-74
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy and Neural Control of an Induction Motor
Autorzy:
Denai, M., A.
Attia, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/908003.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
automatyka
fuzzy control
neural networks
induction motor
vector control
speed observer
Opis:
This paper presents some design approaches to hybrid control systems combining conventional control techniques with fuzzy logic and neural networks. Such a mixed implementation leads to a more effective control design with improved system performance and robustness. While conventional control allows different design objectives such as steady state and transient characteristics of the closed loop system to be specified, fuzzy logic and neural networks are integrated to overcome the problems with uncertainties in the plant parameters and structure encountered in the classical model-based design. Induction motors are characterised by complex, highly non-linear and time-varying dynamics and inaccessibility of some states and outputs for measurements, and hence can be considered as a challenging engineering problem. The advent of vector control techniques has partially solved induction motor control problems, because they are sensitive to drive parameter variations and performance may deteriorate if conventional controllers are used. Fuzzy logic and neural network-based controllers are considered as potential candidates for such an application. Three control approaches are developed and applied to adjust the speed of the drive system. The first control design combines the variable structure theory with the fuzzy logic concept. In the second approach neural networks are used in an internal model control structure. Finally, a fuzzy state feedback controller is developed based on the pole placement technique. A simulation study of these methods is presented. The effectiveness of these controllers is demonstrated for different operating conditions of the drive system.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 2; 221-233
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State observer for doubly-fed induction generator
Autorzy:
Blecharz, K.
Wachowiak, D.
Krzemiński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1193442.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
doubly-fed induction generator
non-linear control
state observer
power control
Opis:
The purpose of this paper is to show a new state observer for doubly-fed generator. A proposed z-type observer algorithm based on mathematical model of doubly fed generator with additional variables treated as a disturbances has been used. A nonlinear multiscalar control method has been proposed to control active and reactive power of the generator. All analyses were verified by simulations and experiments tests.
Źródło:
Power Electronics and Drives; 2017, 2, 37/2; 61-75
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observers of fractional linear continuous-time systems
Autorzy:
Kaczorek, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2106499.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
design
fractional
linear
continuous-time
system
full-order
reduced-order
observer
Opis:
The concepts of full-order and reduced-order observers are extended to the fractional linear continuous-time systems. Necessary and sufficient conditions for the existence of the observers for fractional linear systems are established. Procedures for designing of the observers are given and illustrated by examples.
Źródło:
Archives of Control Sciences; 2022, 32, 1; 73--84
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LMI based fuzzy observer design for Takagi-Sugeno models containing vestigial nonlinear terms
Autorzy:
Krokavec, D.
Filasová, A.
Powiązania:
https://bibliotekanauki.pl/articles/229515.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Takagi-Sugeno models
fuzzy observer
linear matrix inequality
incremental quadratic inequality
Opis:
The paper deals with the problem of full order fuzzy observer design for the class of continuous-time nonlinear systems, represented by Takagi-Sugeno models containing vestigial nonlinear terms. On the basis of the Lyapunov stability criterion and the incremental quadratic inequalities, two design conditions for this kind of system model are outlined in the terms of linear matrix inequalities. A numerical example is given to illustrate the procedure and to validate the performances of the proposed approach.
Źródło:
Archives of Control Sciences; 2014, 24, 1; 39-52
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved direct torque control of induction motors using adaptive observer and sliding mode control
Autorzy:
Kouchih, D
Tadjine, M.
Boucherit, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/229910.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adaptive observer
direct torque control
induction motor
sensorless
sliding mode control
Opis:
This paper presents the synthesis of an adaptive observer which is used for the improvement of the direct torque control of induction motor drives. The observer detects stator flux components in two-phase stationary reference frame, rotor speed and stator resistance by measure of the stator terminal voltages and currents. The observer is adapted using a simple algorithm which does not imply a high computational load. Stability analysis based on Lyapunov theory is performed in order to guarantee the closed loop stability. Simulation tests under load disturbance and stator resistance variation are provided to evaluate the consistency and performance of the proposed control technique in the low and high speeds.
Źródło:
Archives of Control Sciences; 2013, 23, 3; 361-376
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An interval estimator for chlorine monitoring in drinking water distribution systems under uncertain system dynamics, inputs and chlorine concentration measurement errors
Autorzy:
Łangowski, R.
Brdys, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/330246.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
observer
bounding method
modelling dynamics
water quality
obserwator
dynamika modelowania
jakość wody
Opis:
The design of an interval observer for estimation of unmeasured state variables with application to drinking water distribution systems is described. In particular, the design process of such an observer is considered for estimation of the water quality described by the concentration of free chlorine. The interval observer is derived to produce the robust interval bounds on the estimated water quality state variables. The stability and robustness of the interval observer are investigated under uncertainty in system dynamics, inputs, initial conditions and measurement errors. The bounds on the estimated variables are generated by solving two systems of first-order ordinary differential equations. For that reason, despite a large scale of the systems, the numerical efficiency is sufficient for the on-line monitoring of the water quality. Finally, in order to validate the performance of the observer, it is applied to the model of a real water distribution network.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 309-322
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State estimation for miso non-linear systems in controller canonical form
Autorzy:
Schwaller, B.
Ensminger, D.
Dresp-Langley, B.
Ragot, J.
Powiązania:
https://bibliotekanauki.pl/articles/331350.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nonlinear system
state observer
continuous time
układ nieliniowy
obserwator stanu
układ ciągły
Opis:
We propose a new observer where the model, decomposed in generalized canonical form of regulation described by Fliess, is dissociated from the part assuring error correction. The obtained stable exact estimates give direct access to state variables in the form of successive derivatives. The dynamic response of the observer converges exponentially, as long as the nonlinearities are locally of Lipschitz type. In this case, we demonstrate that a quadratic Lyapunov function provides a number of inequalities which guarantee at least local stability. A synthesis of gains is proposed, independent of the observation time scale. Simulations of a Düffing system and a Lorenz strange attractor illustrate theoretical developments.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 3; 569-583
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie algorytmów ewolucyjnych do doboru wzmocnień rozszerzonego obserwatora prędkości maszyny indukcyjnej
Evolutionary algorithms in gains selection of extended speed observer of induction machine
Autorzy:
Wachowiak, D.
Krzemiński, Z.
Strankowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/267349.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
maszyna indukcyjna
obserwator prędkości
algorytm ewolucyjny
induction machine
speed observer
evolutionary algorithms
Opis:
W pracy opisano sposób doboru wzmocnień rozszerzonego obserwatora prędkości maszyny indukcyjnej przy wykorzystaniu algorytmów ewolucyjnych. Zaproponowano funkcję celu opartą na rozkładzie biegunów obserwatora. Ze względu na wpływ prędkości maszyny na dynamikę obserwatora zaproponowano dobór wzmocnień obserwatora dla różnych przedziałów prędkości. Dla poszczególnych przedziałów zaprezentowano wyniki doboru wzmocnień w postaci tabel prezentujących wartości funkcji celu w ostatnim pokoleniu algorytmu ewolucyjnego w kolejnych próbach doboru wzmocnień.
The paper concerns the problem of gains selection of extended speed observer for induction machines. Equations of the observer as well as equations of the dynamics of estimation errors have been presented. Dynamic properties and stability of the observer depend on proper gains selection. The analyzed observer requires an adjustment of 12 gains. Furthermore, the complexity of linearized equations of the error estimation dynamics makes an analytical solution approach for the problem of gains selection impossible. A method based on evolutionary algorithm has been proposed in order to counteract this problem, where a cost function based on poles placement of the observer has been presented. Defined cost function ensures stability of the observer as well as good dynamic properties. The main goal is a transient time reduction of the observer which ensures a proper damping properties in order to avoid the presence of estimation errors oscillations during transient states. Three different rotor speed ranges are considered with separate observer gains set. A series of gains selection attempts have been conducted for every presented speed range. The final results presents and discusses the cost function values in the last generation of evolutionary algorithm.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2018, 61; 73-78
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pontifical Legation to the United Nations
Legacja papieska w ONZ
Autorzy:
Melnyk, Roman
Powiązania:
https://bibliotekanauki.pl/articles/1807555.pdf
Data publikacji:
2019-11-15
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
legacja papieska
stały obserwator
legat papieski
pontifical legation
permanent observer
papal legate
Opis:
Artykuł omawia podstawy prawne legacji papieskiej w Organizacji Narodów Zjednoczonych, międzynarodowa osobowość Stolicy Apostolskiej, status dyplomatyczny misji stałego obserwatora Stolicy Apostolskiej przy ONZ, najnowsze uregulowania prawne dotyczące przedstawicieli papieskich, kanoniczny wymiar urzędu legata papieskiego w ONZ w świetle stosownych przepisów kościelnych oraz role i funkcjonowanie przedstawicieli papieskich w ONZ w kontekście bieżących wydarzeń na świecie. Autor zajmuje sie także statusem prawnym stałego obserwatora i misji Stolicy Apostolskiej w ONZ w kontekście właściwych przepisów, tworzeniem się kanonów KPK w trakcie rewizji Kodeksu Prawa Kanonicznego i reformy Kurii Rzymskiej, istotnymi aspektami instytucji legata papieskiego jako funkcji kościelnej oraz obecnością osób świeckich jako przedstawicieli papieskich.
Źródło:
Roczniki Nauk Prawnych; 2009, 19, 1; 149-165
1507-7896
2544-5227
Pojawia się w:
Roczniki Nauk Prawnych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perfect observer resistant to the changes of dynamics of the standard linear system
Autorzy:
Sławiński, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/200781.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear systems
perfect observers
robust observer
systemy liniowe
obserwacja dokładna
obserwatory doskonałe
Opis:
The article presents a class of perfect observers for standard continuous-time linear systems. Observers are resistant to significant changes in the dynamics of the system. The value of poles of the system can be unlimited as long as their number does not change and the conditions presented in this article are satisfied. There are presented numerical examples and simulations results.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 3; 313-316
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sliding mode tracking control for unmanned helicopter using extended disturbance observer
Autorzy:
Ullah, Ihsan
Pei, Hai-Long
Powiązania:
https://bibliotekanauki.pl/articles/229728.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
unmanned helicopter
external disturbances
sliding mode control
extended disturbance observer
mismatched uncertainty
Opis:
This paper presents a robust control technique for small-scale unmanned helicopters to track predefined trajectories (velocities and heading) in the presence of bounded external disturbances. The controller design is based on the linearized state-space model of the helicopter. The multivariable dynamics of the helicopter is divided into two subsystems, longitudinallateral and heading-heave dynamics respectively. There is no strong coupling between these two subsystems and independent controllers are designed for each subsystem. The external disturbances and model mismatch in the longitudinal-lateral subsystem are present in all (matched and mismatched) channels. This model mismatch and external disturbances are estimated as lumped disturbances using extended disturbance observer and an extended disturbance observer based sliding mode controller is designed for it to counter the effect of these disturbances. In the case of heading-heave subsystem, external disturbances and model mismatch only occur in matched channels so a second order sliding mode controller is designed for it as it is insensitive to matched uncertainties. The control performance is successfully tested in Simulink.
Źródło:
Archives of Control Sciences; 2019, 29, 1; 169-199
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An observer-based controller design for nonlinear discrete-time switched systems with time-delay and affine parametric uncertainty
Autorzy:
Baleghi, N. A.
Shafiei, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/230013.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
discrete-time switched systems
time-delay
affine parametric uncertainty
observer-based controller
Opis:
This paper proposes a design procedure for observer-based controllers of discrete-time switched systems, in the presence of state’s time-delay, nonlinear terms, arbitrary switching signals, and affine parametric uncertainties. The proposed switched observer and the state-feedback controller are designed simultaneously using a set of linear matrix inequalities (LMIs).The stability analysis is performed based on an appropriate Lyapunov–Krasovskii functional with one switched expression, and in the meantime, the sufficient conditions for observer-based stabilization are developed. These conditions are formulated in the form of a feasibility test of a proposed bilinear matrix inequality (BMI) which is a non-convex problem. To make the problem easy to solve, the BMI is transformed into a set of LMIs using the singular value decomposition of output matrices. An important advantage of the proposed method is that the established sufficient conditions depend only on the upper bound of uncertain parameters. Furthermore, in the proposed method, an admissible upper bound for unknown nonlinear terms of the switched system may be calculated using a simple search algorithm. Finally, the efficiency of the proposed controller and the validity of the theoretical results are illustrated through a simulation example.
Źródło:
Archives of Control Sciences; 2020, 30, 3; 501-521
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Actuator fault diagnosis for flat systems: a constraint satisfaction approach
Autorzy:
Seydou, R.
Raissi, T.
Zolghadri, A.
Efimov, D.
Powiązania:
https://bibliotekanauki.pl/articles/330244.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault detection
input observer
flat systems
consistency techniques
detekcja uszkodzeń
technika zgodności
Opis:
This paper describes a robust set-membership-based Fault Detection and Isolation (FDI) technique for a particular class of nonlinear systems, the so-called flat systems. The proposed strategy consists in checking if the expected input value belongs to an estimated feasible set computed using the system model and the derivatives of the measured output vector. The output derivatives are computed using a numerical differentiator. The set-membership estimator design for the input vector takes into account the measurement noise thereby making the consistency test robust. The performances of the proposed strategy are illustrated through a three-tank system simulation affected by actuator faults.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 1; 171-181
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State estimation for a class of nonlinear systems
Autorzy:
Schwaller, B.
Ensminger, D.
Dresp-Langley, B.
Ragot, J.
Powiązania:
https://bibliotekanauki.pl/articles/330611.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nonlinear system
state observer
continuous time
układ nieliniowy
obserwator stanu
układ ciągły
Opis:
We propose a new type of Proportional Integral (PI) state observer for a class of nonlinear systems in continuous time which ensures an asymptotic stable convergence of the state estimates. Approximations of non-linearity are not necessary to obtain such results, but the functions must be, at least locally, of the Lipschitz type. The obtained state variables are exact and robust against noise. Naslin’s damping criterion permits synthesizing gains in an algebraically simple and efficient way. Both the speed and damping of the observer response are controlled in this way. Model simulations based on a Sprott strange attractor are discussed as an example.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 2; 383-394
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation Principle for Nonlinear Systems: a Bilinear Approach
Autorzy:
Hammani, M. A.
Jerbi, H.
Powiązania:
https://bibliotekanauki.pl/articles/908331.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
układ nieliniowy
układ dwuliniowy
obserwator
stabilizacja
nonlinear systems
bilinear systems
observer
stabilization
Opis:
In this paper we investigate the local stabilizability of single-input nonlinear affine systems by means of an estimated state feedback law given by a bilinear observer. The associated bilinear approximating system is assumed to be observable for any input and stabilizable by a homogeneous feedback law of degree zero. Furthermore, we discuss the case of planar systems which admit bad inputs (i.e. the ones that make bilinear systems unobservable). A separation principle for such systems is given.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 2; 481-492
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MIMO intelligent-PID controller design for half car system based on model free control technique
Autorzy:
Djemal, Fathi
Haddar, Maroua
Baslamisli, S. Caglar
Chaari, Riadh
Chaari, Fakher
Haddar, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/1839614.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Model Free Control
intelligent-PID controller
ultra-local model
on-line observer
Opis:
A novel decoupled Multi-Input-Multi-Output Model Free Control strategy is presented in this paper to improve the performance of an active suspension system implemented on a half car model. To damp vibrations generated by road excitation, an algebraic online compensator was integrated in the structure of a classical PID controller to avoid the impact of unpredictable disturbances. The key element of the proposed technique is a non-asymptotic observer that can avoid the use of statistical conventional techniques. Furthermore, the advantage of easy implementation is achieved where only two accelerometers are sufficient and adequate. A comparison with classical PID and LQR is provided to demonstrate the improvement made by the proposed scheme.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 953-969
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dyskretny urok wstydu
The Discreet Charm of Shame
Autorzy:
CHYROWICZ, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/1046768.pdf
Data publikacji:
2020-01-12
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
wstyd, wina, zakłopotanie, obserwator, standard moralny
shame, guilt, embarrassment, observer, moral standard
Opis:
Celem artykułu jest analiza kategorii wstydu z pominięciem dyskusji nad specyficznymi obszarami ludzkiego działania, którym towarzyszy wstyd. Problematyka wstydu najczęściej odnoszona jest do sfery ludzkiej seksualności, wydaje się jednak, że zwyczajowe wiązanie wstydu z jedną tylko sferą ludzkiej aktywności znacznie fenomen wstydu zubaża. Wstyd moralny uznaję za kategorię natury egzystencjalnej, to jest taką, która pozostaje bezpośrednio związana z wewnętrznym rozeznaniem konkretnej, przeżywającej wstyd osoby. Do tak rozumianego wstydu nie można nikogo nakłonić, nawet społeczno-kulturowy kontekst warunkujący uznawanie określonych zachowań za wstydliwe okazuje się niewystarczający – wstydzimy się wtedy, kiedy sami uznajemy, że określona sytuacja w naszym życiu nie powinna mieć miejsca. Mówienie komuś: „powinieneś się wstydzić”, nie przyniesie żadnego efektu, jeśli skarcona osoba nie myśli podobnie. Jakkolwiek wstyd jest uczuciem, którego chcielibyśmy w miarę możliwości uniknąć, pełni on niezwykle ważną rolę w naszym życiu moralnym.
This article seeks to analyze the category of shame, leaving aside some specific areas of human activity attendant upon shame. It seems that the problem of shame is most often found in the area of human sexuality, a fact that impoverishes the category of shame. I treat moral shame as an existential category, which means that it is directly connected with the internal discernment of the person that is ashamed. Understood in such a manner, it is impossible to persuade a person to be ashamed; even the social and cultural contexts that identify concrete types of misbehavior as shameful turn out to be insufficient. We are ashamed when we ourselves believe that a particular situation should not have taken place. Meanwhile, when we tell someone “you should be ashamed,” it will bring about no effect if the person we are reprimanding does not think in the same way. Shame indeed is an emotion we would like to avoid, if possible, nevertheless it plays an extremely important role in our moral lives.
Źródło:
Ethos; 2017, 30, 2 (118); 17-35
0860-8024
Pojawia się w:
Ethos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A fault monitoring method for wind power generation system based on sliding mode observer
Autorzy:
Yu, Wenxin
Huang, Shao Dao
Jiang, Dan
Powiązania:
https://bibliotekanauki.pl/articles/141570.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
double-fed induction generator (DFIG)
sliding model observer (SMO)
stator voltage-oriented
Opis:
In this paper, a rotor current fault monitoring method is proposed based on a sliding mode observer. Firstly, the state-space model of the Double-Fed Induction Generator (DFIG) is constructed by vector transformation. Meanwhile, the stator voltage orientation vector control method is applied to decouple a stator and rotor currents, so as to obtain the correlation between the stator and rotor current. Furthermore, the mathematical model of stator voltage orientation is obtained. Then a state sliding mode observer (SMO) is established for the output current of the rotor of the DFIG. The stability and reachability of the system in a limited time is proved. Finally, the system state is determined by the residuals of the measured and estimated rotor currents. The simulation results show that the method proposed in this paper can effectively monitor the status: a normal state, voltage drop faults, short-circuit faults between windings, and rotor current sensor faults which have the advantages of fast response, high stability.
Źródło:
Archives of Electrical Engineering; 2020, 69, 3; 625-643
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Full-order observers for linear fractional multi-order difference systems
Autorzy:
Wyrwas, M.
Powiązania:
https://bibliotekanauki.pl/articles/199928.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
difference operators
fractional order difference system
observer
operator różniczkowy
obserwator
system różniczkowy
Opis:
The paper is devoted to the construction of observers for linear fractional multi–order difference systems with Riemann–Liouville– and Grünwald–Letnikov–type operators. Basing on the Z-transform method the sufficient condition for the existence of the presented observers is established. The behaviour of the constructed observer is demonstrated in numerical examples.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 891-989
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observer design estimating the propofol concentration in PKPD model with feedback control of anesthesia administration
Autorzy:
Ilyas, Muhammad
Khan, Awais
Khan, Muhammad Abbas
Xie, Wei
Riaz, Raja Ali
Khan, Yousaf
Powiązania:
https://bibliotekanauki.pl/articles/2106507.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pharmacokinetic models
pharmacodynamic model
bispectral index monitor
observer design
sliding mode control
Opis:
Propofol infusion in anesthesia administration requires continual adjustment in the manual infusion system to regulate the hypnosis level. Hypnotic level is based on Bispectral Index Monitor (BIS) showing the cortical activity of the brain scaled between 0 to 100. The new challenging aspect of automation in anaesthesia is to estimate the concentration of hypnotic drugs in different compartments of the body including primary, rapid peripheral (muscle), slow peripheral (bones, fat) and effect site (brain) compartment based on Pharmacokinetics (PK) and Pharmacodynamics (PD) model. This paper aimed to regulate the hypnosis level with estimating the Propofol concentrations using a linear observer in feedback control strategy based on Integral Super-Twisting Sliding Mode Controller (ISTSMC). The drug concentration in plasma of the silico patients accurately estimated in nominal transient. The results show that tracking errors between the actual output in form of BIS level and linearized output nearly approaches to zero in the maintenance phase of anesthesia to ensure the controller response on sliding phase with optimum performances by achieving desired hypnotic level 50 on BIS. The robustness of control strategy is further ensured by adding measurement noise of electromagnetic environment of operation theatre distracting signal quality index of the output BIS level.
Źródło:
Archives of Control Sciences; 2022, 32, 1; 85--103
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza obserwatorów funkcyjnych liniowych ciągłych układów niecałkowitego rzędu
Functional observer synthesis for linear continuous-time fractional systems
Autorzy:
Kociszewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/277471.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
obserwator
funkcyjny
liniowy
ciągły
rząd niecałkowity
observer
functional
continuous-time
fractional order
Opis:
W pracy rozpatrzono problematykę syntezy obserwatorów funkcyjnych ciągłych układów niecałkowitego rzędu. Pokazano, że synteza obserwatora niecałkowitego rzędu polegająca na wyznaczaniu poszczególnych macierzy występujących w jego równaniu może być najpierw zapisana w postaci warunku LMI, a następnie efektywnie rozwiązana za pomocą dedykowanego oprogramowania do optymalizacji wypukłej. Rozważania zilustrowano przykładem symulacyjnym.
The paper presents a problem of synthesis of functional observers for fractional order continuous-time linear systems. It has been shown that this problem can be formulated and solved by the use of linear matrix inequalities (LMI) method. Necessary and sufficient conditions for solvability of the problem for computation of an unknown matrices of asymptotic stable observers have been given. The proposed approach is illustrated by a numerical example.
Źródło:
Pomiary Automatyka Robotyka; 2014, 18, 4; 94-99
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High performance backstepping control of induction motor with adaptive sliding mode observer
Autorzy:
Bakhti, I.
Chaouch, S.
Maakouf, A.
Powiązania:
https://bibliotekanauki.pl/articles/229996.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
induction motor
backstepping control
sliding mode
flux observer design
estimation
sensorless control
Opis:
It is well known that modern control of induction motor relies on a good dynamic model of the motor. Extensive research and activity have been devoted to the problem of induction motor control over the last decade. In this paper we introduce backstepping control with amelioration of performance to guarantee stability of the system. Accurate knowledge of the rotor speed and flux position is the key factor in obtaining a high-performance and high-efficiency induction-motor drive. Thus a sliding mode observer design is presented. Simulation results are included to illustrate good performance of backstepping control of sensorless induction motors with flux observer.
Źródło:
Archives of Control Sciences; 2011, 21, 3; 331-344
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Człowiek, jako użytkownik i obserwator przestrzeni miasta
Man, as a User and Observer of the Urban Space
Autorzy:
Orchowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/345134.pdf
Data publikacji:
2014
Wydawca:
Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego
Tematy:
miasto
przestrzeń publiczna
człowiek
użytkownik
obserwator
city
public space
man
user
observer
Opis:
Artykuł dotyczy relacji, jakie zachodzą pomiędzy człowiekiem a przestrzenią publiczną miasta. Kształtując środowisko miejskie człowiek determinuje swoje zachowania i reakcje w przestrzeni. Kreując przestrzeń człowiek dokonuje swego rodzaju manipulacji zasobami środowiska miejskiego dla wykorzystania jego walorów i uzyskania określonych celów środowiskowych. Każde miejsce przestrzeni miasta podlega naszej ocenie. Pieszy użytkownik w sposób szczególny reaguje na walory miejsca, ze względu na swój bliski kontakt z ukształtowanym otoczeniem. Może być obserwatorem środowiska, jako turysta lub też fizycznie korzystać z jego możliwości, jako mieszkaniec i przeżywać przestrzeń w sposób osobisty.
This article applies to relations that take place between the man and the public space of the city. Shaping the urban environment determines human behavior and its reactions in space. Creating the space a man somehow manipulates the resources of the urban environment to use its assets and achieve specific environmental objectives. The whole urban space is a subject of our assessment. Pedestrians specifically respond to values of the place, due to their close contact with the previously shaped environment. It can be an observer of the environment, as a tourist or take a physical advantage of its capabilities, as a resident and “feel” it in a personal way.
Źródło:
Środowisko Mieszkaniowe; 2014, 13; 180-185
1731-2442
2543-8700
Pojawia się w:
Środowisko Mieszkaniowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observation Procedures Characterizing Occupational Physical Activities: Critical Review
Autorzy:
Denis, D.
Lortie, M.
Rossignol, M.
Powiązania:
https://bibliotekanauki.pl/articles/89974.pdf
Data publikacji:
2000
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
physical work
observation procedures
reliability
validity
observer training
obserwacja
praca fizyczna
warunki pracy
Opis:
The first objective of this paper is to compare the observation procedures proposed to characterize physical work. The second objective is to examine the following 3 methodological issues: reliability, observer training, and internal validity. Seventy-two papers were reviewed, 38 of which proposed a new or modified observation grid. The observation variables identified were broken down into 7 categories as follows: posture, exertion, load handled, work environment, use of feet, use of hands, and activities or tasks performed. The review revealed the variability of existing procedures. The examination of methodological issues showed that observation data can be reliable and can present an adequate internal validity. However, little information about the conditions necessary to achieve good reliability was available.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2000, 6, 4; 463-491
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Range Identification for a Perspective Dynamic System with a Single Homogeneous Observation
Autorzy:
Ma, L.
Chen, Y.
Moore, K. L.
Powiązania:
https://bibliotekanauki.pl/articles/908492.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system identyfikacji
układ dynamiczny
obserwator nieliniowy
range identification
perspective dynamic systems
nonlinear observer
Opis:
Perspective problems arise in machine vision when using a camera to observe the scene. Essential problems include the identification of unknown states and/or unknown parameters from perspective observations. Range identification is used to estimate the states/positions of a moving object with known motion parameters. Range estimation has been discussed in the literature using nonlinear observers with full homogeneous observations derived from the image plane. In this paper, the same range identification problem is discussed with a single homogeneous observation using nonlinear observers. Our simulation results verify the convergence of the observers when their observability conditions are satisfied.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2005, 15, 1; 63-72
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault diagnosis of non-linear dynamical systems using analytical and soft computing methods
Autorzy:
Korbicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/384480.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
fault detection
unknown input observer
dynamical neural networks
neuro-fuzzy systems
evolutionary algorithms
Opis:
The paper deals with the problems of robust fault detection using analytical methods (observers and unknown input observers) and soft computing techniques (neural networks, neuro-fuzzy networks and genetic programming). The model-based approach to Fault Detection and Isolation (FDI) is considered. In particular, observers for non-linear Lipschitz systems and extended unknown input observers are discussed. In the case of soft computing techniques, the main objective is to show how to employ the bounded-error approach to determine the uncertainty of the GMDH and neuro-fuzzy networks. It is shown that based on soft computing models uncertainty defined as a confidence range for the model output, adaptive thresholds can be defined. The final part of the paper presents two illustrative examples that confirm the effectiveness of the unknown input observers and the neuro-fuzzy networks approaches.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 1; 7-23
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust observer design for Sugeno systems with incremental quadratic nonlinearity in the consequent
Autorzy:
Moodi, H.
Farrokhi, M.
Powiązania:
https://bibliotekanauki.pl/articles/331108.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nonlinear Sugeno model
incremental quadratic constraint
robust observer
model Sugeno nieliniowy
obserwator odporny
Opis:
This paper is concerned with observer design for nonlinear systems that are modeled by T–S fuzzy systems containing parametric and nonparametric uncertainties. Unlike most Sugeno models, the proposed method contains nonlinear functions in the consequent part of the fuzzy IF-THEN rules. This will allow modeling a wider class of systems with smaller modelling errors. The consequent part of each rule contains a linear part plus a nonlinear term, which has an incremental quadratic constraint. This constraint relaxes the conservativeness introduced by other regular constraints for nonlinearities such as the Lipschitz conditions. To further reduce the conservativeness, a nonlinear injection term is added to the observer dynamics. Simulation examples show the effectiveness of the proposed method compared with the existing techniques reported in well-established journals.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 4; 711-723
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New observer-based control design for mismatched uncertain systems with time-delay
Autorzy:
Huynh, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/229302.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
observer-based control
time-delay systems
linear matrix inequality (LMI)
mismatched uncertain systems
Opis:
In this paper, the state estimation problem for a class of mismatched uncertain time-delay systems is addressed. The estimation uses observer-based control techniques. The mismatched uncertain time-delay systems investigated in this study include mismatched parameter uncertainties in the state matrix and in the delayed state matrix. First, based on a new lemma with appropriately choosing Lyapunov functional, new results for stabilization of mismatched uncertain time-delay systems are provided on the basis of a linear matrix inequality (LMI) framework and the asymptotic convergence properties for the estimation error is ensured. Second, the control and observer gains are given from single LMI feasible solution which can overcome the drawback of the bilinear matrix inequalities approach often reported in the literature. Finally, a numerical example is used to demonstrate the efficacy of the proposed method.
Źródło:
Archives of Control Sciences; 2016, 26, 4; 597-610
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated design of observer based fault detection for a class of uncertain nonlinear systems
Autorzy:
Chen, W.
Khan, A, Q.
Abid, M.
Ding, S. X.
Powiązania:
https://bibliotekanauki.pl/articles/907595.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
detekcja uszkodzeń
obserwator
system nieliniowy
optymalizacja
odporność
fault detection
observer
nonlinear system
optimization
robustness
Opis:
Integrated design of observer based Fault Detection (FD) for a class of uncertain nonlinear systems with Lipschitz nonlinearities is studied. In the context of norm based residual evaluation, the residual generator and evaluator are designed together in an integrated form, and, based on it, a trade-off FD system is finally achieved in the sense that, for a given Fault Detection Rate (FDR), the False Alarm Rate (FAR) is minimized. A numerical example is given to illustrate the effectiveness of the proposed design method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 423-430
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault identification in underwater vehicle thrusters via sliding mode observers
Autorzy:
Zuev, Alexander
Zhirabok, Alexey
Filaretov, Vladimir
Powiązania:
https://bibliotekanauki.pl/articles/1838162.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
underwater vehicle
thruster
fault identification
sliding mode observer
pojazd podwodny
identyfikacja uszkodzenia
sterowanie ślizgowe
Opis:
The paper is devoted to the problem of increasing the efficiency of underwater vehicles by using a fault diagnosis system for their thrusters which provides detection, isolation, and identification of minor faults. To address the problem, a two-stage method is proposed. At the first stage, a bank of diagnostic observers is designed to detect and isolate the emerging faults. Each observer in this bank is constructed to be sensitive to some set of faults and insensitive to others. At the second stage, additional observers working in sliding mode are synthesized in order to accurately estimate the error value in the signal obtained from the angular velocity sensor and to estimate deviations of the thruster parameters from their nominal values due to the faults. In contrast to the existing solutions, reduced-order (i.e., lower-dimensional) models of the original system are proposed as a basis to construct sliding mode observers. This approach permits reduction of the complexity of the obtained observers in comparison with the known methods, where full-order observers are constructed. The simulation results show the efficiency and high quality of all synthesized observers. In all cases considered, it was possible to detect typical faults, as well as estimate their values.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 4; 679-688
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improved dynamic surface sliding mode method for autonomous cooperative formation control of underactuated USVS with complex marine environment disturbances
Autorzy:
Dong, Zaopeng
Qi, Shijie
Yu, Min
Zhang, Zhengqi
Zhang, Haisheng
Li, Jiakang
Liu, Yang
Powiązania:
https://bibliotekanauki.pl/articles/32909478.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
underactuated USV
dynamic surface sliding mode control
lateral velocity tracking differentiator
nonlinear disturbance observer
Opis:
In this paper, a novel dynamic surface sliding mode control (DSSMC) method, combined with a lateral velocity tracking differentiator (LVTD), is proposed for the cooperative formation control of underactuated unmanned surface vehicles (USVs) exposed to complex marine environment disturbances. Firstly, in view of the kinematic and dynamic models of USVs and the design idea of a virtual control law in a backstepping approach, the trajectory tracking control problem of USVs’ cooperative formation is transformed into a stabilisation problem of the virtual control law of longitudinal and lateral velocities. Then, aiming at the problem of differential explosion caused by repeated derivation in the process of backstepping design, the first-order low-pass filter about the virtual longitudinal velocity and intermediate state quantity of position is constructed to replace differential calculations during the design of the control law, respectively. In order to reduce the steady-state error when stabilising the virtual lateral velocity control law, the integral term is introduced into the design of the sliding mode surface with a lateral velocity error, and then the second-order sliding mode surface with an integral is structured. In addition, due to the problem of controller oscillation and the role of the tracking differentiator (TD) in active disturbance rejection control (ADRC), the LVTD is designed to smooth the state quantity of lateral velocity. Subsequently, based on the dynamic model of USV under complex marine environment disturbances, the nonlinear disturbance observer is designed to observe the disturbances and compensate the control law. Finally, the whole cooperative formation system is proved to be uniformly and ultimately bounded, according to the Lyapunov stability theory, and the stability and validity of the method is also verified by the simulation results.
Źródło:
Polish Maritime Research; 2022, 3; 47-60
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zasada sprawiedliwości a dostęp do opieki zdrowotnej
The Principle of Justice and Health Care Availability
Autorzy:
Szymańska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/528121.pdf
Data publikacji:
2012
Wydawca:
Krakowska Akademia im. Andrzeja Frycza Modrzewskiego
Tematy:
justice
medical care
Rawls’ theory of ethics
dispassionate observer
“veil of ignorance”
ethical dilemmas
Opis:
The main purpose of my paper is to consider a problem of justice in a context of health care. The John Rawls’ theory is my point of methodological departure. He states in it the importance of the concept of fairness and equality from behind what he terms a “veil of ignorance”. Rawls refers to the “original position” in which a person is attempting to determine a fair arrangement for society without any preconceived notions or prejudices. I refer, however, his theory to the health care field and I consider such problems as fair distribution of medical care or fair partition of taxes for personal insurance. Further problems appear there in consequence, e.g. who has the privilege to attain the medical help as a first and the resulting doctor’s ethical dilemmas.
Źródło:
Państwo i Społeczeństwo; 2012, 1; 159-178
1643-8299
2451-0858
Pojawia się w:
Państwo i Społeczeństwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable structure observer design for a class of uncertain systems with a time-varying delay
Autorzy:
Liu W., J.
Powiązania:
https://bibliotekanauki.pl/articles/330119.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
obserwator
niezmienniczość
uogólniona odwrotność macierzy
variable structure observer
invariance property
generalized matrix inverse approach
Opis:
Design of a state observer is an important issue in control systems and signal processing. It is well known that it is difficult to obtain the desired properties of state feedback control if some or all of the system states cannot be directly measured. Moreover, the existence of a lumped perturbation and/or a time delay usually reduces the system performance or even produces an instability in the closed-loop system. Therefore, in this paper, a new Variable Structure Observer (VSO) is proposed for a class of uncertain systems subjected to a time varying delay and a lumped perturbation. Based on the strictly positive real concept, the stability of the equivalent error system is verified. Based on the generalized matrix inverse approach, the global reaching condition of the sliding mode of the error system is guaranteed. Also, the proposed variable structure observer will be shown to possess the invariance property in relation to the lumped perturbation, as the traditional variable structure controller does. Furthermore, two illustrative examples with a series of computer simulation studies are given to demonstrate the effectiveness of the proposed design method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 575-583
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractional Order Sliding Mode Speed Control of Feedback Linearized Induction Motor
Autorzy:
Fetene, Yeshiwas
Shibeshi, Dereje
Powiązania:
https://bibliotekanauki.pl/articles/1193868.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
induction motor
input-output feedback
linearization
fractional-order sliding mode controller
SVPWM
load torque observer
Opis:
Induction machines have of late become the most popular workhorses in the industry replacing DC machines because of their advantages, such as reduced cost, reliability and the absence of commutators, which make them adapt to unfavourable conditions with lower maintenance requirement. However, higher-order models of AC machines, nonlinearities in model equations, uncertainties in parameters and load disturbances make induction motors difficult to control than that of DC motors. In this paper, a robust control strategy considering the recent advances in technology is proposed employing input-output feedback linearization for the exact decoupling of electromagnetic torque and rotor flux using fractional-order sliding mode controller (SMC) for the outer speed loop. The sliding mode observer is also designed to extract the rotor flux from the DC input voltage of the inverter and stator current measurements. Finally, a comparison between the commonly used proportional integral and derivative (PID) controller and the proposed fractional-order SMCs is made and the conclusion is reached.
Źródło:
Power Electronics and Drives; 2020, 5, 40; 109-122
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Hamiltonian approach to fault isolation in a planar vertical take-off and landing aircraft model
Autorzy:
Rodriguez-Alfaro, L. H.
Alcorta-Garcia, E.
Lara, D.
Romero, G.
Powiązania:
https://bibliotekanauki.pl/articles/330664.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Hamiltonian method
observer
fault diagnosis
nonlinear system
UAVs
metoda Hamiltonowska
obserwator
diagnoza uszkodzeń
układ nieliniowy
Opis:
The problem of fault detection and isolation in a class of nonlinear systems having a Hamiltonian representation is considered. In particular, a model of a planar vertical take-off and landing aircraft with sensor and actuator faults is studied. A Hamiltonian representation is derived from an Euler–Lagrange representation of the system model considered. In this form, nonlinear decoupling is applied in order to obtain subsystems with (as much as possible) specific fault sensitivity properties. The resulting decoupled subsystem is represented as a Hamiltonian system and observer-based residual generators are designed. The results are presented through simulations to show the effectiveness of the proposed approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 65-76
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From structural analysis to observer-based residual generation for fault detection
Autorzy:
Pröll, S.
Lunze, J.
Jarmolowitz, F.
Powiązania:
https://bibliotekanauki.pl/articles/330986.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault diagnosis
structural analysis
observer based diagnosis
diagnosability analysis
diagnostyka uszkodzeń
analiza strukturalna
analiza diagnostyczna
Opis:
This paper combines methods for the structural analysis of bipartite graphs with observer-based residual generation. The analysis of bipartite structure graphs leads to over-determined subsets of equations within a system model, which make it possible to compute residuals for fault detection. In observer-based diagnosis, by contrast, an observability analysis finds observable subsystems, for which residuals can be generated by state observers. This paper reveals a fundamental relationship between these two graph-theoretic approaches to diagnosability analysis and shows that for linear systems the structurally over-determined set of model equations equals the output connected part of the system. Moreover, a condition is proved which allows us to verify structural observability of a system by means of the corresponding bipartite graph. An important consequence of this result is a comprehensive approach to fault detection systems, which starts with finding the over-determined part of a given system by means of a bipartite structure graph and continues with designing an observer-based residual generator for the fault-detectable subsystem found in the first step.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 2; 233-245
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduced-order fractional descriptor observers for a class of fractional descriptor continuous-time nonlinear systems
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/331141.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fractional system
descriptor system
nonlinear system
reduced order observer
układ ułamkowy
układ deskryptorowy
układ nieliniowy
Opis:
Fractional descriptor reduced-order nonlinear observers for a class of fractional descriptor continuous-time nonlinear systems are proposed. Sufficient conditions for the existence of the observers are established. The design procedure for the observers is given and demonstrated on a numerical example.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 277-283
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Powerful nonlinear observer associated with field-oriented control of an induction motor
Autorzy:
Mansouri, A.
Chenafa, M.
Bouhenna, A.
Etien, E.
Powiązania:
https://bibliotekanauki.pl/articles/907397.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
silnik indukcyjny
obserwator nieliniowy
rezystancja wirnika
induction motor
field-oriented control
nonlinear observer
rotor resistance
Opis:
In this paper, we associate field-oriented control with a powerful nonlinear robust flux observer for an induction motor to show the improvement made by this observer compared with the open-loop and classical estimator used in this type of control. We implement this design strategy through an extension of a special class of nonlinear multivariable systems satisfying some regularity assumptions. We show by an extensive study that this observer is completely satisfactory at low and nominal speeds and it is not sensitive to disturbances and parametric errors. It is robust to changes in load torque, rotational speed and rotor resistance. The method achieves a good performance with only one easier gain tuning obtained from an algebraic Lyapunov equation. Finally, we present results and simulations with concluding remarks on the advantages and perspectives for the observer proposed with the field-oriented control.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 2; 209-220
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directed hypergraph observers-based qualitative fault monitoring tasks
Autorzy:
Garai, Dhaou
El Harabi, Rafika
Bacha, Faouzi
Powiązania:
https://bibliotekanauki.pl/articles/2096167.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
graphical modelling
directed hypergraph observer
fault monitoring
qualitative analysis
modelowanie graficzne
monitorowanie błędów
analiza jakościowa
Opis:
To create a precise model structure and perform fault monitoring algorithms for a wide range of complex systems along with dynamic behavioural characteristics, the causal graph-based methods were considered herein. In this paper, a new scheme was devised based on fast fault detection mechanism relying on the Directed Hypergraph Observer model. The performance of the suggested pattern is illustrated by a case study including systems with single energy. Noting that the modern methods possess a large range of applications for the reliability and energy effectiveness analysis related to multi-energy systems. The Directed Hypergraph model architecture was exploited to generate the diagnostic condition based on a graphical observer.
Źródło:
Diagnostyka; 2021, 22, 4; 67-76
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of dynamic hysteresis model for a magnetorheological damper
Autorzy:
Chen, Kun-Yung
Kung, Ming-Lung
Powiązania:
https://bibliotekanauki.pl/articles/2200888.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
identification
LuGre model
magnetorheological damper
self-learning particle
swarm optimization
SLPSO
sliding mode observer
SMO
Opis:
The paper proposes a new dynamic model based on the LuGre model and an electrical equation to describe the hysteresis phenomenon for a magnetorheological (MR) damper. In addition, a sliding mode observer (SMO) is proposed to estimate unmeasurable states of the MR damper. The parameters of the MR damper are successfully identified by using the self-learning particle swarm optimization (SLPSO) algorithm. The contributions of this paper are: i) a new dynamic model based on the LuGre model and an electrical equation for an MR damper is successfully formulated to fit for the hysteresis behavior, ii) the exerted damping force can be practically adjusted by using input voltage for the dynamic model, iii) the SMO is proposed to estimate the internal states and current, and iv) the unknown parameters of the MR damper are successfully identified by using the SLPSO algorithm with a numerical experiment.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 259--274
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekranizacje powieści Agathy Christie „Morderstwo w Orient Expressie”– obserwujesz i jesteś obserwowany
Screen adaptations of Agatha Christie’s novel Murder in Orient Express – you observe and you are being observed
Autorzy:
Bartoszewicz, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/1191945.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Wrocławski. Oficyna Wydawnicza ATUT – Wrocławskie Wydawnictwo Oświatowe
Tematy:
Agatha Christie
Murder in Orient Express
screen adaptation
Heisenberg’s uncertainty principle
adaptation
observer
interpretation
Opis:
Agatha Christie (1890–1976), less known as lady Mallowan, an outstanding author, mainly of detective novels, published “Murder in Orient Express” in 1933/34. From the very beginning, the book was considered a masterpiece of this genre. The reason for that is not only brilliantly constructed plot with astonishing culminating point, but also the fact that the author of the book referred to an authentic event which evoked great emotions. The event that inspired this novel was kidnapping and murder of the little son of a known and admired American pioneer of intercontinental flights, Charles August Lindbergh, that happened in 1932. The novel was translated into almost all languages. There were also numerous stage adaptations. At least four films were based on this novel which indicates the cultural significance of the work. The subject of the considerations in the present paper is an attempt to search for the answer about the role of the so-called observer in the process of reconstruction, retransmission and assimilation of thematic threads, which can become the reference point not only for the author of the literary work. They may become an element of collective memory and, in this way, the element of culture constituting narration. However, as an object of general knowledge, they are at the same time subjected to common interpretation. The Heisenberg’s uncertainty principle, referred to in its basic range in quantum mechanics, indicates the significant role of the subject observing in this process. Heisenberg proved that the presence of an observer is not neutral from the point of view of the quality of the results. Referring to these considerations on the text as a cultural object, let us analyse the ways in which the theme was modified and the significance of these changes. We consider Agatha Christie’s novel and especially its screen adaptations an interesting object of research. The observer, as it turns out, is beside the researcher also the author of the literary text, screenwriter, translator…
Źródło:
Studia Translatorica; 2019, 10; 113-133
2084-3321
2657-4802
Pojawia się w:
Studia Translatorica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of Unmanned Surface Vehicle along the desired trajectory using improved Line of Sight and estimated sideslip angle
Autorzy:
Li, Ligang
Pei, Zhiyuan
Jin, Jiucai
Dai, Yongshou
Powiązania:
https://bibliotekanauki.pl/articles/1551827.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
curve path following control
surge velocity guidance law
extended state observer
sliding mode control
USV
Opis:
In order to improve the accuracy and robustness of path following control for an Unmanned Surface Vehicle (USV) suffering from unknown and complex disturbances, a variable speed curve path following a control method based on an extended state observer was proposed. Firstly, the effect of the environmental disturbances on the USV is equivalent to an unknown and time-varying sideslip angle, and the sideslip angle is estimated by using the extended state observer (ESO) and compensated in the Line of Sight (LOS) guidance law. Secondly, based on the traditional LOS guidance law, the design of the surge velocity guidance law is added to enable the USV to self-adjust the surge velocity according to the curvature of the curve path, thus further improving the tracking accuracy. Finally, the heading and speed controller of the USV is designed by using a sliding mode control to track the desired heading and speed accurately, and then the path following control of the USV’s curve path is realised. Simulation results verify the effectiveness of the proposed method.
Źródło:
Polish Maritime Research; 2021, 2; 18-26
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new algebraic LQR weight selection algorithm for tracking control of 2 DoF torsion system
Autorzy:
Elumalai, V. K.
Subramanian, R. G.
Powiązania:
https://bibliotekanauki.pl/articles/140978.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ARE
high gain observer
LQR
Q and R matrices
2 DoF torsion system
trajectory tacking
Opis:
This paper proposes a novel linear quadratic regulator (LQR) weight selection algorithm by synthesizing the algebraic Riccati equation (ARE) with the Lagrange multiplier method for command following applications of a 2 degree of freedom (DoF) torsion system. The optimal performance of LQR greatly depends on the elements of weighting matrices Q and R. However, normally these weighting matrices are chosen by a trial and error approach which is not only time consuming but cumbersome. Hence, to address this issue, blending the design criteria in time domain with the ARE, we put forward an algebraic weight selection algorithm, which makes the LQR design both simple and modular. Moreover, to estimate the velocity of a servo angle, a high gain observer (HGO) is designed and integrated with the LQR control scheme. The efficacy of the proposed control scheme is tested on a benchmark 2 DoF torsion system for a trajectory tracking application. Both the steady state and dynamic characteristics of the proposed controller are assessed. The experimental results accentuate that the proposed HGO based LQR scheme can guarantee the system to attain the design requirements with minimal vibrations and tracking errors.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 55-75
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduced-order fractional descriptor observers for fractional descriptor continuous-time linear system
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/201870.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional descriptor linear systems
design
reduced order
descriptor
fractional
observer
redukcja rzędu
projekt
deskryptor
obserwator
Opis:
Fractional descriptor reduced-order observers for fractional descriptor continuous-time linear systems are proposed. Necessary and sufficient conditions for the existence of the observers are established. The design procedure of the observers is given and is demonstrated on two numerical examples.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 889-895
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synteza obserwatora pełnego rzędu singularnych układów dyskretnych niecałkowitego rzędu
Full order observer synthesis for singular discrete-time fractional systems
Autorzy:
Kociszewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/275773.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
obserwator
układ singularny
dyskretny
liniowa nierówność macierzowa
observer
singular system
discrete-time
linear matrix inequality
Opis:
W pracy rozpatrzono zagadnienie syntezy obserwatora pełnego rzędu dla układów liniowych dyskretnych singularnych niecałkowitego rzędu. Sformułowano analityczne kryteria istnienia obserwatora i podano sposób wyznaczania macierzy wzmocnień obserwatora. Rozważania teoretyczne, do których wykorzystano liniowe nierówności macierzowe (LMI) zilustrowano przykładem liczbowym.
The paper is devoted to observer synthesis for linear singular discrete-time fractional systems. The problem of finding a nonnegative gain matrix of the observer such that the observer is asymptotically stable is formulated and solved by the use of linear matrix inequality (LMI) method. The proposed approach to the observer synthesis is illustrated by theoretical example.
Źródło:
Pomiary Automatyka Robotyka; 2016, 20, 4; 9-13
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed model reference control for synchronization of a vehicle platoon with limited output information and subject to periodical intermittent information
Autorzy:
Prayitno, Agung
Indrawati, Veronica
Nilkhamhang, Itthisek
Powiązania:
https://bibliotekanauki.pl/articles/24200695.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
cooperative observer
distributed model reference control
intermittent information
vehicle platoon
obserwator współpracujący
model rozproszony
konwój pojazdów
Opis:
Vehicles involved in platoon formation may experience difficulties in obtaining full-state information that can be exchanged and used for controller synthesis. Therefore, a distributed controller based on a model reference and designed utilizing a cooperative observer is proposed for vehicle platoon synchronization. The proposed controller is composed of three main blocks, namely, the reference model, the cooperative observer and the main controller. The reference model is developed by using a homogeneous vehicle platoon that utilizes cooperative full-state information. The cooperative observer is a state estimator which is constructed based on the cooperative output estimation error. It provides state estimates to be used by the main controller. The main controller is constructed from a nominal control and a synchronization input. The nominal control has the main task of tracking the lead vehicle, while in order to reduce the synchronization error, the synchronization input is added by utilizing the cooperative disagreement error. Stability analysis is focused on the vehicle platoon when it is subjected to completely periodical intermittent information. The condition on the information rate is derived for guaranteeing the synchronization of the platoon. Numerical simulation of a vehicle platoon consisting of one leader and five followers is used to examine the performance of the controller.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2023, 33, 4; 537--551
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ implementacji modelu przejścia i modelu pomiarowego na działanie filtru cząsteczkowego
Effect of implementation system model and measurement model for particle filter working
Autorzy:
Kozierski, P.
Powiązania:
https://bibliotekanauki.pl/articles/407980.pdf
Data publikacji:
2012
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
filtr cząsteczkowy
obserwator stanu
model przejścia
model pomiarowy
particle filter
state observer
system model
measurement model
Opis:
W artykule przedstawiono wpływ różnych realizacji modelu przejścia oraz modelu pomiarowego na działanie filtru cząsteczkowego. Zaproponowano przy tym kilka metod aproksymacji tych warunkowych funkcji gęstości prawdopodobieństwa.
The results of different implementations of system model and measurement model for particle filter are presented in the paper. Several approximation methods for those conditional probability density functions are proposed.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2012, 3; 54-57
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disturbance observer-assisted hybrid control for autonomous manipulation in a robotic backhoe
Autorzy:
CS, Meera
Gupta, Mukul Kumar
Santhakumar, Mohan
Powiązania:
https://bibliotekanauki.pl/articles/139958.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
disturbance observer
robotic backhoe
autonomous excavation
hybrid control
obserwator zakłóceń
koparka zrobotyzowana
koparka autonomiczna
kontrola hybrydowa
Opis:
Automation of earth moving machineries is a widely studied problem. This paper focusses on one of the main challenges in automation of the earth moving industry, estimation of loading torque acting on the machinery. Loading torque acting on the excavation machinery is a very significant aspect in terms of both machine and operator safety. In this study, a disturbance observer-assisted control system for the estimation of loading torque acting on a robotic backhoe during excavation process is presented. The proposed observer does not use any acceleration measurements, rather, is proposed as a function of joint velocity. Numerical simulations are performed to demonstrate the effectiveness of the proposed control scheme in tracking the reaction torques for a given dig cycle. Co-simulation experiments demonstrate robust performance and accurate tracking of the proposed control in both disturbance torque and position tracking. Further, the performance and sensitivity of the proposed control are also analyzed through the help of performance error quantifiers, the root-mean-square (RMS) values of the position and disturbance tracking errors.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 2; 153-169
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An H∞ sliding mode observer for Takagi–Sugeno nonlinear systems with simultaneous actuator and sensor faults
Autorzy:
Ben Brahim, A.
Dhahri, S.
Ben Hmida, F.
Sellami, A.
Powiązania:
https://bibliotekanauki.pl/articles/330626.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fault reconstruction
fault estimation
simultaneous fault
H∞ sliding mode observer
uncertain Takagi Sugeno system
LMI optimization
Opis:
This paper considers the problem of robust reconstruction of simultaneous actuator and sensor faults for a class of uncertain Takagi–Sugeno nonlinear systems with unmeasurable premise variables. The proposed fault reconstruction and estimation design method with H∞ performance is used to reconstruct both actuator and sensor faults when the latter are transformed into pseudo-actuator faults by introducing a simple filter. The main contribution is to develop a sliding mode observer (SMO) with two discontinuous terms to solve the problem of simultaneous faults. Sufficient stability conditions in terms linear matrix inequalities are achieved to guarantee the stability of the state estimation error. The observer gains are obtained by solving a convex multiobjective optimization problem. Simulation examples are given to illustrate the performance of the proposed observer.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 3; 547-559
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infinite-dimensional Sylvester equations: basic theory and application to observer design
Autorzy:
Emirsajłow, Z.
Powiązania:
https://bibliotekanauki.pl/articles/331453.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
równanie nieskończenie wymiarowe
półgrupa złożona
obserwator stanu
infinite dimensional Sylvester equation
implemented semigroup
state observer design
Opis:
This paper develops a mathematical framework for the infinite-dimensional Sylvester equation both in the differential and the algebraic form. It uses the implemented semigroup concept as the main mathematical tool. This concept may be found in the literature on evolution equations occurring in mathematics and physics and is rather unknown in systems and control theories. But it is just systems and control theory where Sylvester equations widely appear, and for this reason we intend to give a mathematically rigorous introduction to the subject which is tailored to researchers and postgraduate students working on systems and control. This goal motivates the assumptions under which the results are developed. As an important example of applications we study the problem of designing an asymptotic state observer for a linear infinite dimensional control system with a bounded input operator and an unbounded output operator.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 2; 245-257
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ślizgowy obserwator prędkości kątowej napędu prądu stałego
Sliding mode angular velocity observer of the DC drive
Autorzy:
Sieklucki, G.
Sykulski, R.
Bisztyga, B.
Orzechowski, T.
Zdrojewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/320318.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
napęd prądu stałego
obserwator zmiennych stanu
sterowanie ślizgowe
chattering
DC drive
state observer
sliding mode control
Opis:
Artykuł przedstawia obserwator ze sprzężeniem zwrotnym. Zaprezentowano obserwator prędkości kątowej bazujący na sterowaniu ślizgowym. Omówiono wpływ parametrów obserwatora na uzyskiwaną jakość regulacji prędkości. Omówiono metody eliminacji zjawiska chatteringu - filtr dolnoprzepustowy, zastąpienie funkcji sign przez sat (nasycenie). Przedstawiono wyniki badań symulacyjnych.
The article presents the closed-loop observer. The observer of the angular velocity based on the sliding mode con-trol is shown. The influence of the observer parameters on velocity control quality is talked over. The elimination of the chattering phenomenon is discussed - low-pass filter and replacement of the function sign by sat (saturation). Simulation results are presented.
Źródło:
Elektrotechnika i Elektronika; 2010, 29, 1--2; 41-46
1640-7202
Pojawia się w:
Elektrotechnika i Elektronika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of the unmeasured signals in a two-mass system – filtering analysis
Odtwarzanie niemierzalnych sygnałów w układzie dwu-masowym – analiza filtracji
Autorzy:
Sieklucki, G.
Pracownik, A.
Orzechowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/267867.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
two-mass system
Bode diagram
observer
LQ problem
system dwu-masowy
charakterystyki Bodego
obserwator
problem LQ
Opis:
The paper describes full-order observer for a two-mass electric drive with a flexible shaft. The following state variables: the load machine speed, load torque (disturbance) and torsional torque are estimated. Optimization of the observer is based on the LQ problem. The selection of Q matrix in a performance index is determined by observability condition for LQ problem. This approach leads to minimal nonzero elements in the weight matrix. The Bode diagrams for designed observers are shown and analyzed. The experimental results confirm the usefulness of presented method in the industrial applications.
W większości przypadków do modelowania układów napędowych przyjmuje się pewne uproszczenia polegające na założeniu absolutnej sztywności połączeń pomiędzy silnikiem a maszyną roboczą. Wówczas mechaniczną część układu napędowego można traktować jako jedną masę zastępczą. Otrzymany model matematyczny układu 1-masowego może być dla pewnych zastosowań przemysłowych niewystarczająco dokładny. Ponadto, prędkość maszyny roboczej, moment obciążenia i moment skręcający jest trudno zmierzyć. Oznacza to konieczność odtworzenia tych sygnałów. W artykule opisano obserwatora pełnego rzędu dla napędu z połączeniem sprężystym. Następujące zmienne stanu: prędkość maszyny roboczej, moment obciążenia (zakłócenie) oraz moment skręcający są odtwarzane. Optymalizacja obserwatora jest oparta na problemie LQ. Wybór macierzy Q we wskaźniku jakości jest zrealizowany na podstawie macierzy obserwowalności. Charakterystyki Bodego prezentowanych obserwatorów zostały przedstawione i przeanalizowane. Wyniki eksperymentalne potwierdzają przydatność metody w zastosowaniach przemysłowych.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 49; 99-104
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
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