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Wyświetlanie 1-15 z 27
Tytuł:
Fast optimal feedback controller for electric linear actuator used in spreading systems of road spreaders
Autorzy:
Dobrowolski, D.
Dobrowolski, J.
Piekarska, W.
Stępień, S.
Powiązania:
https://bibliotekanauki.pl/articles/201515.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear electric actuator
nonlinear modelling
optimal feedback control
Opis:
Modern and innovative road spreaders are now equipped with a special swiveling mechanism of the spreading disc. It allows for adjusting asymmetrical or a symmetrical spreading pattern and provides for the possibility to maintain the size of the spreading surface and achieve an accurately defined spreading pattern with spreading widths. Thus the paper presents a modelling and control design methodology, and the concept is proposed to design high-performance and optimal drive systems for spreading devices. The paper deals with a nonlinear model of an electric linear actuator and solution of the new intelligent/optimal control problem for the actuator.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 6; 1041-1047
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach to nonlinear modelling of dynamic systems based on fuzzy rules
Autorzy:
Bartczuk, Ł.
Przybył, A.
Cpałka, K.
Powiązania:
https://bibliotekanauki.pl/articles/330372.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nonlinear modelling
dynamic system
fuzzy system
interpretability of fuzzy system
evolutionary algorithm
modelowanie nieliniowe
układ dynamiczny
system rozmyty
algorytm ewolucyjny
Opis:
For many practical weakly nonlinear systems we have their approximated linear model. Its parameters are known or can be determined by one of typical identification procedures. The model obtained using these methods well describes the main features of the system’s dynamics. However, usually it has a low accuracy, which can be a result of the omission of many secondary phenomena in its description. In this paper we propose a new approach to the modelling of weakly nonlinear dynamic systems. In this approach we assume that the model of the weakly nonlinear system is composed of two parts: a linear term and a separate nonlinear correction term. The elements of the correction term are described by fuzzy rules which are designed in such a way as to minimize the inaccuracy resulting from the use of an approximate linear model. This gives us very rich possibilities for exploring and interpreting the operation of the modelled system. An important advantage of the proposed approach is a set of new interpretability criteria of the knowledge represented by fuzzy rules. Taking them into account in the process of automatic model selection allows us to reach a compromise between the accuracy of modelling and the readability of fuzzy rules.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 3; 603-621
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Modelling of Nonlinear Systems and Phenomena with the Use of Volterra and Wiener Series
Autorzy:
Borys, A.
Powiązania:
https://bibliotekanauki.pl/articles/116165.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Methods and Algorithms
nonlinear systems
Wiener Series
Modelling of Nonlinear Systems
Volterra Series
Discrete-Time Nonlinear Systems
Volterra Theory
Opis:
This is a short tutorial on Volterra and Wiener series applications to modelling of nonlinear systems and phenomena, and also a survey of the recent achievements in this area. In particular, we show here how the philosophies standing behind each of the above theories differ from each other. On the other hand, we discuss also mathematical relationships between Volterra and Wiener kernels and operators. Also, the problem of a best approximation of large-scale nonlinear systems using Volterra operators in weighted Fock spaces is described. Examples of applications considered are the following: Volterra series use in description of nonlinear distortions in satellite systems and their equalization or compensation, exploiting Wiener kernels to modelling of biological systems, the use of both Volterra and Wiener theories in description of ocean waves and in magnetic resonance spectroscopy. Moreover, connections between Volterra series and neural network models, and also input-output descriptions of quantum systems by Volterra series are discussed. Finally, we consider application of Volterra series to solving some nonlinear problems occurring in hydrology, navigation, and transportation.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 1; 91-98
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear vibrations of periodic beams
Autorzy:
Domagalski, Ł.
Jędrysiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/280198.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
nonlinear vibrations
periodic beams
tolerance modelling
Opis:
Geometrically nonlinear vibrations of beams with properties periodically varying along the axis are investigated. The tolerance method of averaging differential operators with highly oscillating coefficients is applied to obtain governing equations with constant coefficients. The proposed model describes dynamics of the beam with the effect of microstructure size. In an example, an analysis of undamped forced nonlinear vibrations of the periodic beam is shown. Moreover, the results obtained for undamped free vibrations of periodic beams by the tolerance model are justified by those results from the finite element method. These results can be used as a benchmark in similar problems.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1095-1108
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Physical Model of the Nonlinear Sitar String
Autorzy:
Siddiq, S.
Powiązania:
https://bibliotekanauki.pl/articles/177221.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sitar
physical modelling
nonlinear string vibration
dispersion
Opis:
The acoustic properties of the sitar string are studied with the aid of a physical model. The nonlinearity of the string movement caused by the bridge acting as an obstacle to the vibrating string is of special interest. Comparison of the model’s audio output to recordings of the instrument shows interesting similarities. The effects dispersion and bridge have on the sound of the instrument are demonstrated in the model.
Źródło:
Archives of Acoustics; 2012, 37, 1; 73-79
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The simulation analysis of the bridge rectifier continuous operation in AC circuit
Autorzy:
Wciślik, M.
Strząbała, P.
Powiązania:
https://bibliotekanauki.pl/articles/97283.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
nonlinear load
bridge rectifier
modelling
active and reactive power
Opis:
The paper deals with a nonlinear model of the full–wave bridge rectifier in AC circuit with RC load for non–rigid supply system. The mathematical model of the AC circuit for this load was worked out using dimensionless variables. The model of the circuit was created and analyzed with MATLAB/Simulink. Analysis of harmonic distortions of the currents and voltages in considered circuit was carried out. Indices of power quality are described. The current–voltage characteristics for different values of capacitive load are presented. The balances active and reactive powers in the circuit were performed.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 53-65
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A control algorithm applied to polarization states of light in the nonlinear optical resonator
Autorzy:
Wierzbicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/206554.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
dwustabilność optyczna
układ nieliniowy
inverse modelling
nonlinear systems
optical bistability
Opis:
In this paper a control algorithm is presented for a nonlinear system defined by a nonlinear mapping F : R^n -> R^n of input states to output states of the system, for the problem of motion in the R^n space of output states along the given trajectory. The application of this algorithm in nonlinear optics is presented, for the control of light polarization transmitted through the Fabry-Perot resonator filled with a material with nonlinear optical properties. The calculated trajectory in the space of polarization states of output light leads to the phenomenon of optical bistability, i.e. sudden changes of output polarization induced by small variations of the input parameters, and the dependence of the current state of light polarization on the history of the system.
Źródło:
Control and Cybernetics; 2002, 31, 1; 129-139
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikromechaniczne modelowanie nieliniowej charakterystyki odkształcenie naprężenie dla kompozytu szklano-epoksydowego ściskanego w poprzek włókien
Micromechanical modeling of the nonlinear stress-strain behavior in glass/epoxy lamina subjected to transverse compression
Autorzy:
Romanowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/387516.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
modelowanie
charakterystyka nieliniowa
odkształcenie
naprężenie
modelling
nonlinear characteristics
deformation
tension
Opis:
Praca dotyczy wyznaczania, na podstawie modeli mikromechanicznych, nieliniowej charakterystyki odkształcenie- naprężenie dla kompozytu szklano-epoksydowego ściskanego w poprzek włókien. W pracy wykorzystano heksagonalny element reprezentatywny (RVE) uwzględniający istnienie interfazy oraz metodę elementów skończonych (MES). W celu identyfikacji mechanizmów zniszczenia rozpatrzono trzy modele numeryczne. Przyjęto założenie, że nieliniowość krzywej ściskania jest efektem złożonego mechanizmu pękania kompozytu w wyniku plastycznego ścinania matrycy i interfazy połączonego z odklejaniem się włókien na granicy interfejsu. Wymienione efekty modelowano za pomocą kryterium Coulomba, przyjmując w tym celu różne naprężenia krytyczne matrycy, interfazy i interfejsu. Adekwatność modeli mikromechanicznych MES oceniono na podstawie porównania wyznaczonych numerycznie krzywych ściskania z danymi eksperymentalnymi dla kompozytu szklano-epoksydowego.
Using micromechanics models, which take into account existence of a interphase region, the nonlinear stress-strain relationship for a glass/epoxy lamina subjected to transverse compression was determined in this paper. To compute stress for given strain, the three-phased unit cell with a hexagonal symmetry that accounts for imperfect interface condition and nonlinear finite element method were employed. An identification of failure mechanisms from micromechanics models was presented. A general assumption that mechanisms of plastic deformation along shear bands in matrix and fiber-matrix debonding are responsible for the nonlinear stress-strain behavior in glass/epoxy lamina subjected to transverse compression was validated. To predict the damage evolution in the epoxy matrix and the development of interface debonding, the Mohr-Coulomb criterion was used. Model predictions were compared with experimental results for glass/epoxy lamina.
Źródło:
Acta Mechanica et Automatica; 2009, 3, 2; 8-85
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of complex dynamic nonlinear loading process for electromagnetic mill
Autorzy:
Ogonowski, Szymon
Bismor, Dariusz
Ogonowski, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/229680.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
predictive control
pole placement
nonlinear dynamics
neural modelling
electromagnetic mill
Opis:
Electromagnetic mill installation for dry grinding represents a complex dynamical system that requires specially designed control system. The paper presents model-based predictive control which locates closed loop poles in arbitrary places. The controller performs as gains cheduling prototype where nonlinear model – artificial recurrent neural network, is parameterized with additional measurements and serves as a basis for local linear approximation. Application of such a concept to control electromagnetic mill load allows for stable performance of the installation and assures fulfilment of the product quality as well as the optimization of the energy consumption.
Źródło:
Archives of Control Sciences; 2020, 30, 3; 471-500
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Two Nonlinear Predictive Control Algorithms for Dissolved Oxygen Tracking Problem at WWTP
Autorzy:
Piotrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/384859.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
aeration
dissolved oxygen
wastewater treatment
mathematical modelling
nonlinear system
predictive control
Opis:
The wastewater treatment plant is classified as a complex system due to its nonlinear dynamics, large uncertainty in the disturbance inputs, multiple time scales in the internal process dynamics and multivariable structure. Aeration is an important and expensive activity that is carried out during wastewater treatment plant operation. A precise aeration control in biological processes for all the operating conditions is necessary in order to guarantee adequate biological conditions for microorganisms. Therefore, the most important is to operate the biological processes so that a minimal energy was consumed and minimal DO concentration demand was applied. The paper proposes a two advanced control systems to track the dissolved oxygen reference trajectory. A decentralized and multivariable nonlinear predictive control algorithms are designed and compared. Simulation tests for the case study wastewater treatment plant are presented.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 1; 8-16
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of thin periodic plates subjected to large deflections
Modelowanie cienkich płyt periodycznych o dużych ugięciach
Autorzy:
Domagalski, Ł.
Jędrysiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/395941.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
płyty periodyczne
zginanie nieliniowe
modelowanie tolerancyjne
periodic plates
nonlinear bending
tolerance modelling
Opis:
The objects under consideration are thin linear-elastic plates with periodic structure in planes parallel to the plate midplane, subjected to large (of the order of plate thickness) deflections. The main aim is to propose a mathematical model describing geometrically nonlinear problems of such plates, which is based on the tolerance averaging technique, cf. Woźniak et al. [3]. Results calculated for a special static problem by the tolerance model are compared with results obtained within the known tolerance linear model of thin plates.
W pracy rozpatrywane są cienkie, liniowo-sprężyste płyty o budowie periodycznej w płaszczyznach równoległych do płaszczyzny środkowej. Zagadnienia statyki i dynamiki tego rodzaju płyt w zakresie dużych ugięć opisane są układem równań różniczkowych nieliniowych o silnie oscylujących, periodycznych, nieciągłych współczynnikach (por. książka pod red. Woźniaka i in. [3]). W celu otrzymania równań o stałych współczynnikach zastosowano tu technikę tolerancyjnego uśredniania, omówioną w książce pod red. Woźniaka, Michalaka i Jędrysiaka [5]. Zaproponowano nieliniowy model tolerancyjny, opisujący nieliniowo-geometryczne zagadnienia cienkich płyt periodycznych. Model ten zastosowano do wyznaczenia ugięć dla danego obciążenia, a otrzymane wyniki porównano z wynikami uzyskanymi w ramach liniowego modelu tolerancyjnego.
Źródło:
Civil and Environmental Engineering Reports; 2010, 5; 133-148
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometrically nonlinear vibrations of thin visco-elastic periodic plates on a foundation with damping: non-asymptotic modelling
Autorzy:
Jędrysiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/280289.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
thin visco-elastic periodic plates
nonlinear vibrations
effect of microstructure size
analytical tolerance modelling
Opis:
The objects under consideration are thin visco-elastic periodic plates with moderately large deflections. Geometrically nonlinear vibrations of these plates are investigated. In order to take into account the effect of microstructure size on behaviour of these plates a non- -asymptotic modelling method is proposed. Using this method, called the tolerance modelling, model equations with constant coefficients involving terms dependent on the microstructure size can be derived. In this paper, only theoretical considerations of the problem of nonlinear vibrations of thin visco-elastic periodic plates resting on a foundation with damping are presented.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 945-961
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear vibrations of periodic beams
Autorzy:
Domagalski, Ł.
Jędrysiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/127716.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
nonlinear vibrations
periodic beams
tolerance modelling
drgania nieliniowe
belka o strukturze periodycznej
modelowanie tolerancyjne
Opis:
Geometrically nonlinear vibrations of beams with properties periodically varying along the axis are investigated. The tolerance method of averaging differential operators with highly oscillating coefficients is applied to obtain the governing equations with constant coefficients. The proposed model describes the dynamics of the beam with the effect of the microstructure size.
Źródło:
Vibrations in Physical Systems; 2014, 26; 73-78
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding of Meyer and Stephens’s operator o as a multi-operational one
Autorzy:
Borys, A.
Powiązania:
https://bibliotekanauki.pl/articles/226031.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
operators and operations
operator o
Volterra series
weakly nonlinear circuits
modelling harmonic and intermodulation distortion
Opis:
In this paper, the idea of an extended operator o introduced in the literature on modelling weakly nonlinear circuits by Meyer and Stephens is revisited. The mathematically precise definitions of this operator for the successive Volterra series terms are given. Furthermore, the exhaustive formal and illustrative descriptions of these definitions are also presented. Finally, the possibility of a reverse formulation for the convolution operations occurring in descriptions of weakly nonlinear circuits is reported.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 3; 273-277
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-varying time-delay estimation for nonlinear systems using neural networks
Autorzy:
Tan, Y.
Powiązania:
https://bibliotekanauki.pl/articles/907277.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
modelowanie procesu
opóźnienie czasowe
układ nieliniowy
sieć neuronowa
modelling
time delay
nonlinear systems
neural networks
estimation
Opis:
Nonlinear dynamic processes with time-varying time delays can often be encountered in industry. Time-delay estimation for nonlinear dynamic systems with time-varying time delays is an important issue for system identification. In order to estimate the dynamics of a process, a dynamic neural network with an external recurrent structure is applied in the modeling procedure. In the case where a delay is time varying, a useful way is to develop on-line time-delay estimation mechanisms to track the time-delay variation. In this paper, two schemes called direct and indirect time-delay estimators are proposed. The indirect time-delay estimator considers the procedure of time-delay estimation as a nonlinear programming problem. On the other hand, the direct time-delay estimation scheme applies a neural network to construct a time-delay estimator to track the time-varying time-delay. Finally, a numerical example is considered for testing the proposed methods.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 1; 63-68
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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