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Wyświetlanie 1-15 z 89
Tytuł:
Matlab-simulink modelling of induction machine incorporating magnetic saturation
Autorzy:
Drozdowski, P.
Duda, A.
Powiązania:
https://bibliotekanauki.pl/articles/1811892.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
induction machine
saturation
mathematical model
MATLAB Simulink
SimPower Systems Modelling
Opis:
In this paper the computer model of the cage induction machine incorporating magnetic nonlinearity was presented. The model contains the mathematical model of the induction machine recorded as an S-function and the connecting blocs attaching the model from one side to the three phase terminals of the supply system model and from the other to the system of mechanical model. Hence, SimPowerSystems and SimMechanics libraries can be used. Such a methodology allows for various drives modelling were the induction machine operates as a motor or a generator and cooperates with power electronics. Using wide range of Simulink possibilities various control techniques can be applied. Using this methodology the own mathematical models of other electrical machines together with the Simulink library models can be used.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 38-44
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of DP systems in full mission ship simulator
Modele systemów dynamicznego pozycjonowania w wielozadaniowym symulatorze statku
Autorzy:
Zalewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/359467.pdf
Data publikacji:
2010
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
symulator statku
systemy DP
filtracja Kalmana
modelowanie systemów
ship's simulator
DP systems
Kalman filtering
systems modelling
Opis:
The paper presents modelling principles of DP systems integrated into the modernized full mission ship simulator of Kongsberg Polaris® type at Maritime University of Szczecin. Comparisons to real systems and research possibilities are given. Basing on the effects and conclusions obtained from scientific-research works performed by marine traffic engineering staff until now, the advantages of modernization of "full mission simulator" have been shown.
W artykule przedstawiono modele systemów dynamicznego pozycjonowania (DP) w wielozadaniowym symulatorze statku typu Kongsberg Polaris® w Akademii Morskiej w Szczecinie. Zaprezentowano porównania z rzeczywistymi systemami i możliwości badawcze. Na podstawie rezultatów dotychczasowych prac naukowo-badawczych realizowanych w Instytucie Inżynierii Ruchu Morskiego AM w Szczecinie przedstawiono zalety modernizacji wielozadaniowego symulatora manewrowo-nawigacyjnego statku.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2010, 20 (92); 146-152
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systemic Evolutionary Algorithm inspired by methods of Quantum computer sciences for the improvement of the accuracy of neural models in electrical engineering and electrical power engineering
Autorzy:
Tchórzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/97692.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Evolutionary Algorithms
Quantum computer science
Quantum mixed number
Systems modelling
Robot PR–02
Artificial Neural Networks
MATLAB and Simulink environment
Electric Power Exchange
Opis:
The work contains selected results of research on the application of quantum computer science to a systemic evolutionary algorithm for the purpose of improving accuracy of neural models in electrical engineering and electrical power engineering. Artificial neural networks are used in neural modeling, which networks are designed and taught models of systems using available numerical data. Parameters of neural networks, and especially, elements of weight matrices, biases as well as parameters of activation functions may be improved using evolutionary algorithms. It seems that applying solutions offered by quantum computer science to systemic evolutionary algorithm, and especially, as regards creation of quantum initial population, quantum crossover and mutation operators as well as selection, considerably improves the accuracy of modelling, which was verified in MATLAB and Simulink environment using selected examples such as RP–02 robot’s arm movement, the development of the Polish Electrical Power Exchange (polish: TGEE) system, etc.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 280-296
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Surgical Training Practice with the Spring Tensor Heuristic Model
Autorzy:
Chiu, C.
Chaczko, Z.
Powiązania:
https://bibliotekanauki.pl/articles/226752.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laparoscopic surgical training
spring tensor model
modelling and simulation systems
Opis:
The enhancement of surgical simulation tools is an important research study, to assist in the assessment and feedback of medical training practice. In this research, the Spring Tensor Model (STEM) has been used for laparoscopic end-effector navigation through obstacles and high-risk areas. The modelling of the surgical trainer as part of the laparoscopic simulator seeks to emulate the physical environment as a virtualized representation in the integrated infrastructure. Combining sensor network framework paradigms to a surgical knowledge-based construct demonstrates how STEM can enhance medical practice. The architectural hybridisation of the training framework has enabled the adaptation of STEM modelling techniques for a simulated laparoscopic training methodology. The primary benefit of the architecture is that this integration strategy has resulted in a seamless transition of the heuristic framework to be applied to surgical training.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 3; 237-244
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of discrete - continuous model of vibroisolation system of railway substructure
Autorzy:
Bednarz, J.
Powiązania:
https://bibliotekanauki.pl/articles/241979.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibroisolation
modelling of railway tracks systems
elastic-damping elements
Opis:
Based on analysis of the railroads, construction can be concluded that the wide variety of design of the track rail vehicles is applicable in the country. The constructions of railways tracks can be divided into two main groups: separate trackways and built-in trackways. In the paper, a construction of vibroisolated trackway built-in or located on engineering structure such as bridge or viaduct is presented. This proposed construction of trackway consists of an embankment of land on which the bottom slab is located. On the concrete bottom slab, the perforated rubber plates are stacked constituting the elastic vibration isolation system. On the rubber platen, the concrete slab constituting the so-called inertial mass is mounted. Then, on the platen, the sand bed and the two layers of gravel with a variable grain size are placed. The final layer of crushed stone reaches the level of railway ties to which the elastic rail pads are attached. The several mathematical models of such vibration isolation systems of railway tracks were proposed. One of these models allowing for an analysis that allows to formulate both optimum conditions due to the selection and distribution of elastic-damping elements to ensure the translational movement of the platen and the vehicle so the vibration isolation system was “highly tuned”, i.e. the natural frequency of the system was higher than the frequency of excitation caused by rail vehicles. It is a new trend in the design and selection of vibration isolation systems of railway tracks. In the paper, the conception of discrete-continuous vibration isolation system in which a continuous part is the beam supported on discretely distributed elastic elements is presented. The load to the system is modelling as solid body simulating the moving rail vehicle. The results of this analysis are the main part of the proper selection of vibration isolation system of railway tracks.
Źródło:
Journal of KONES; 2013, 20, 3; 35-40
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
Identification of systems reliability
Autorzy:
Wesołowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/93046.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
identification
systems
modelling
reliability of systems
Opis:
A purpose of the article is discussing the method of technical systems reliability modelling. The most important methods used for constructing realist models of the physical world, i.e. the method of the experimental modelling and the method of the probabilistic modelling, were presented. The particular attention was focussed on the method of the probabilistic modelling allowing for taking into account uncertainty in functioning of systems. An example of using the proposed method to the modelling of the reliability of the air-traffic-control-system was quoted.
Źródło:
Studia Informatica : systems and information technology; 2011, 1-2(15); 43-54
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling Safety of Multistate Ageing Systems
Autorzy:
Kołowrocki, K.
Soszyńska-Budny, J.
Powiązania:
https://bibliotekanauki.pl/articles/2068803.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
modelling
ageing systems
multistate
safety
Opis:
First, basic notions of the multistate system safety analysis are introduced, i.e. the multistate components and the multistate system, the multistate system component safety function, the multistate system safety and the multistate system risk function are defined. Moreover, the multistate system component and the multistate system main safety characteristics, i.e. their mean values of the lifetimes and in the safety state subsets and in the particular safety states and standard deviations and the moment when the system risk function exceeds a fixed permitted level are determined. Furthermore, there are constructed safety models of the multi-state homogeneous and non-homogeneous series, parallel, “m out of n”, consecutive “m out of n: F”, series-parallel, parallel-series, series-“m out of n”, “m out of n”-series, series-consecutive “m out of n: F” and consecutive “m out of n: F”-series systems and their safety functions are determined. Moreover, a very often met in practiceseries system composed of multistate subsystems identical with the considered earlier multistate systems is considered and its safety function is determined.
Źródło:
Journal of Polish Safety and Reliability Association; 2017, 8, 3; 9--22
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of computer systems : an approach for functional and dependability analysis
Autorzy:
Michalska, K.
Powiązania:
https://bibliotekanauki.pl/articles/2069629.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
dependability
modelling
computer systems
service
Opis:
The paper presents a method of analyzing dependability aspects of service oriented information systems based on functional and dependability modelling. Analysis approach is based on integrating different computer system models into one coherent model suitable for simulation. To simplify integration of the models author propose an automatic solution that is integrated with the tools chosen for system analysis. Analysis is done with a usage of open-source simulation environment that can be easily modified and extended for farther work. Based on the simulation results, with respect to defined dependability and functionality metrics, some alternatives can be chosen in case of system or service failure. The paper presents developed software which implements described methodology and results of analysis for an exemplary business service oriented complex information system.
Źródło:
Journal of Polish Safety and Reliability Association; 2011, 2, 1; 153--162
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Softcomputing approach to discrete transport system analysis
Autorzy:
Mazurkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2069159.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
dependability
modelling
complex systems
softcomputing
Opis:
The paper presents an approach to complex analysis of sophisticated Discrete Transport Systems (DTS) using softcomputing. The proposed methodology can efficiently substitute the classical approach especially since dependability parameters of the system are mostly approximated by experts instead of classical sources of data. On the other hand we can try to combine reliability and functional aspects. The paper describes the multicriteria scientific field of the Discrete Transport Systems and shows the way how the softcomputing can be in use in the sensible way. Moreover, results of the numerical experiment performed on a test case scenario related to the reliability and functional aspects using proposed methodology are given. The approach allows reducing the problem of assumptions of reliability distributions and – this way – seems to be very interesting for real systems management and tuning.
Źródło:
Journal of Polish Safety and Reliability Association; 2013, 4, 2; 219--228
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A discrete-continuous method of mechanical system modelling
Autorzy:
Hein, R.
Powiązania:
https://bibliotekanauki.pl/articles/258662.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
modelling
mechanical system
dynamic systems
vibrations
hybrid modelling methods
Opis:
The paper describes a discrete-continuous method of dynamic system modelling. The presented approach is hybrid in its nature, as it combines the advantages of spatial discretization methods with those of continuous system modelling methods. In the proposed method, a three-dimensional system is discretised in two directions only, with the third direction remaining continuous. The thus obtained discrete-continuous model is described by a set of coupled partial differential equations, derived using the rigid finite element method (RFEM). For this purpose, firstly the general differential equations are written. Then these equations are converted into difference equations. The derived equations, expressed in matrix form, allow to create a global matrix for the whole system. They are solved using the distributed transfer function method. The proposed approach is illustrated with the examples of a simple beam fixed at both ends and a simply supported plate.
Źródło:
Polish Maritime Research; 2017, S 1; 97-107
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinematics and dynamics of multibody system based on natural and joint coordinates using velocity transformations
Zastosowanie współrzędnych naturalnych i względnych oraz transformacji prędkości w kinematyce i dynamice układów wieloczłonowych
Autorzy:
Arczewski, K.P.
Issa, S.M.
Powiązania:
https://bibliotekanauki.pl/articles/281076.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
analytical mechanics
multibody systems
mathematical modelling
Opis:
The equations of motion are initially formulated using natural coodinates. These coordinates are used to define the position of the system, kinematic joints between bodies, and forcing functions on and between the bodies. When using this system of coordinates the definition of initial system is straightforward. The equations of motion are then expressed in terms of relative joint coordinates with the use of velocity transformation method. The velocity transformation matrix relates the relative coordinates to the natural ones. The kinematic relationships for each joint type and the graph theory for identifying the system topology are used in constructing the velocity transformation matrix. Use of both natural and relative coordinates produces an efficient set of equations without loss of generality, then the equations of motion can be efficiently integrated.
W pierwszej fazie modelowania matematycznego równania ruchu formułowane są we współrzędnych naturalnych. Współrzędne te zostały zastosowane do określenia położenia układu, połączeń kinematycznych między ciałami, a także do wyrażenia sił działających na ciała. Następnie równania ruchu wyrażone zostały za pomocą współrzędnych względnych do czego wykorzystano tzw. Metodę transformacji prędkości. Macierz transformacji prędkości wiąże oba układy współrzędnych. Macierz ta tworzona jest na podstawie informacji o rodzajach połączeń kinematycznych między ciałami oraz na podstawie informacji o topologii ukladu. Przy zastosowaniu obu rodzajów współrzędnych otrzymujemy równania ruchu w ogólnej postaci, które następnie mogą być efektywnie całkowane.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 4; 905-918
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy approach to complex system analysis
Autorzy:
Mazurkiewicz, J.
Nowak, K.
Walkowiak, T.
Powiązania:
https://bibliotekanauki.pl/articles/2069196.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
dependability
modelling
complex systems
fuzzy logic
Opis:
The paper presents a new approach to reliability and functional analysis of sophisticated complex systems using fuzzy logic. We propose to use such methodology since dependability parameters of the system are mostly approximated by experts instead of classical sources of data. Presented approach show different idea – modeling system using the unified structure – in functional sense. We assess the reliability of the system by accumulated down time. Fuzzy logic based reliability analysis, as well as Computer Information System and Discrete Transport System modeling and simulation are presented. Moreover, results of numerical experiment performed on a test case scenario related to the economic and functional aspects using proposed methodology are given. Fuzzy approach allows reducing the problem of assumptions of reliability distributions and – this way – seems to be very interesting for real systems management and tuning.
Źródło:
Journal of Polish Safety and Reliability Association; 2012, 3, 2; 169--178
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of the coordinate measuring systems accuracy
Autorzy:
Sladek, J.
Gaska, A.
Powiązania:
https://bibliotekanauki.pl/articles/99798.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
coordinate measuring systems
modelling
uncertainty
accuracy
Opis:
Coordinate metrology determines nowadays the relevant directions of development in automated measuring systems and quality management in the field of machine industry. The essential problem of coordinate measuring technique application is the issue of accuracy assessment of performed measurements. This paper describes the development of coordinate systems modelling as a new field of assessing the accuracy of measurements carried out in a quasi-real time. The practical solutions of the so-called virtual machines and virtual measuring systems were described along with the results of their evaluation and validation methodology based on a comparison of obtained results with the results produced by the typical methods of coordinate measurements accuracy assessment.
Źródło:
Journal of Machine Engineering; 2016, 16, 3; 34-46
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improvement of Gamma approximation for reduction of continuous interval systems
Autorzy:
Bokam, Jagadish Kumar
Singh, Vinay Pratap
Devarapalli, Ramesh
García Márquez, Fausto Pedro
Powiązania:
https://bibliotekanauki.pl/articles/1409387.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous interval systems
Kharitonov polynomials
Routh approximation
modelling
SISO systems
MIMO systems
Opis:
In recent, modeling practical systems as interval systems is gaining more attention of control researchers due to various advantages of interval systems. This research work presents a new approach for reducing the high-order continuous interval system (HOCIS) utilizing improved Gamma approximation. The denominator polynomial of reduced-order continuous interval model (ROCIM) is obtained using modified Routh table, while the numerator polynomial is derived using Gamma parameters. The distinctive features of this approach are: (i) It always generates a stable model for stable HOCIS in contrast to other recent existing techniques; (ii) It always produces interval models for interval systems in contrast to other relevant methods, and, (iii) The proposed technique can be applied to any system in opposite to some existing techniques which are applicable to second-order and third-order systems only. The accuracy and effectiveness of the proposed method are demonstrated by considering test cases of single-inputsingle-output (SISO) and multi-input-multi-output (MIMO) continuous interval systems. The robust stability analysis for ROCIM is also presented to support the effectiveness of proposed technique.
Źródło:
Archives of Control Sciences; 2021, 31, 2; 347-373
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 89

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