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Tytuł:
Theoretical analysis of the efficiency of a V2G wireless charger for electric vehicles
Autorzy:
Triviño, Alicia
Gonzalez-Gonzalez, Jose M.
Aguado, Jose A.
Powiązania:
https://bibliotekanauki.pl/articles/136256.pdf
Data publikacji:
2019
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
V2G
wireless discharge
losses
efficiency
electric vehicle
inductively-coupled power system
ICPT
bidirectional
wireless charging
Opis:
V2G (Vehicle-to-grid) technology will report important benefits for the operation and safety of the grid. In order to facilitate the expansion of the V2G technology in a future, it is recommended to offer the drivers with easy to use methods to charge and discharge their EV batteries. In this sense, wireless chargers are expected to play a relevant role in the future electrical networks as it reduces the users intervention. The development of this kind of system is still open to improve them in terms of their operation, their compliance and their control. An important issue for the evaluation of these systems is the efficiency, which measures the power losses occurring in the system. This paper addresses a deep study about the losses in a bidirectional wireless charger. Then, it provides with a mathematical model to characterize them. This model is validated by means of experimental results conducted in a 3.7-kW prototype.
Źródło:
Transactions on Environment and Electrical Engineering; 2019, 3, 1; 9-14
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The well-posedness of a swimming model in the 3-D incompressible fluid governed by the nonstationary Stokes equation
Autorzy:
Khapalov, A.
Powiązania:
https://bibliotekanauki.pl/articles/330536.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
swimming model
coupled PDE/ODE system
nonstationary Stokes equation
sprzężony system PDE/ODE
równanie Stokesa
Opis:
We introduce and investigate the well-posedness of a model describing the self-propelled motion of a small abstract swimmer in the 3-D incompressible fluid governed by the nonstationary Stokes equation, typically associated with low Reynolds numbers. It is assumed that the swimmer’s body consists of finitely many subsequently connected parts, identified with the fluid they occupy, linked by rotational and elastic Hooke forces. Models like this are of interest in biological and engineering applications dealing with the study and design of propulsion systems in fluids.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 2; 277-290
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The control of drilling vibrations: A coupled PDE-ODE modeling approach
Autorzy:
Saldivar, B.
Mondié, S.
Ávila Vilchis, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/331138.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
drilling vibrations
LMI approach
ultimate boundedness
coupled wave-ODE system
Opis:
The main purpose of this contribution is the control of both torsional and axial vibrations occurring along a rotary oilwell drilling system. The model considered consists of a wave equation coupled to an ordinary differential equation (ODE) through a nonlinear function describing the rock–bit interaction. We propose a systematic method to design feedback controllers guaranteeing ultimate boundedness of the system trajectories and leading consequently to the suppression of harmful dynamics. The proposal of a Lyapunov–Krasovskii functional provides stability conditions stated in terms of the solution of a set of linear and bilinear matrix inequalities (LMIs, BMIs). Numerical simulations illustrate the efficiency of the obtained control laws.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 335-349
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System identification and tuning of wireless power transfer systems with multiple magnetically coupled resonators
Autorzy:
Winges, J.
Rylander, T.
Petersson, C.
Ekman, C.
Johansson, L.-Å.
McKelvey, T.
Powiązania:
https://bibliotekanauki.pl/articles/136270.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
wireless power transfer
magnetically coupled resonators
system identification
tuning
Bayesian estimation
impedance matching
charging electric vehicles
Opis:
We present a procedure for system identification and tuning of a wireless power transfer (WPT) system with four magnetically coupled resonators, where each resonator consists of a coil and a capacitor bank. The system-identification procedure involves three main steps: 1) individual measurement of the capacitor banks in the system; 2) measurement of the frequency-dependent two-port impedance matrix of the magnetically coupled resonators; and 3) determining the inductance of all coils and their corresponding coupling coefficients using a Bayesian approach. The Bayesian approach involves solving an optimization problem where we minimize the mismatch between the measured and simulated impedance matrix together with a penalization term that incorporates information from a direct measurement procedure of the inductance and losses of the coils. This identification procedure yields an accurate system model which we use to tune the four capacitance values to recover high system-performance and account for, e.g., manufacturing tolerances and coil displacement. For a prototype WPT system, we achieve 3.3 kW power transfer with 91% system efficiency over an air-gap distance of approximately 20 cm.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 2; 86-92
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supporting marine environment research by modeling
Autorzy:
Jakacki, Jaromir
Przyborska, Anna
Darecki, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/1955263.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska
Tematy:
Modeling-Baltic Sea
coupled models
regional models
hydrodynamic modeling
eBalticGrid system
SatBaltic system
Opis:
The Centre of Informatics – Tri-City Academic Supercomputer and Network (CI TASK) was founded over twenty-five years ago, in 1994. It was a very important initiative undertaken as a result of rapid development of computer technology and one of its main goals was to integrate the computer resources of scientific communities in the Tri-City. CI TASKstarted to provide computing resources and the first steps in the world of high-performance computing must have been proved to be a significant challenge. The scientific community of the Institute of Oceanology has been cooperating with that computing centre since the very beginning.Currently, CI TASKprovides the widest set of tools and hardware that can be used for ocean modeling purposes. The main goal of this work is expression of appreciation and gratitude for the people who have contributed to the developing of this institution and helped in the work using their tools.CI TASK has been helpful in a great number of past and present tasks, however, in this paper we would like to present only three results of our work – a coupled ice-ocean model of the Baltic Sea, assessment of contamination for potential leak age from chemical munition dumped after the Second World War, and the currently operating SatBaltic system.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2018, 22, 4; 351--363
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple environment for developing methods of controlling chaos in spatially distributed systems
Autorzy:
Korus, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/907826.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
stabilność układu
wykładnik Lapunowa
metoda Lyapunova
coupled map lattice
spatiotemporal chaos
system stability
Lyapunov exponents
net direction phase
Opis:
The paper presents a simple mathematical model called a coupled map lattice (CML). For some range of its parameters, this model generates complex, spatiotemporal behavior which seems to be chaotic. The main purpose of the paper is to provide results of stability analysis and compare them with those obtained from numerical simulation. The indirect Lyapunov method and Lyapunov exponents are used to examine the dependence on initial conditions. The net direction phase is introduced to measure the symmetry of the system state trajectory. In addition, a real system, which can be modeled by the CML, is presented. In general, this article describes basic elements of environment, which can be used for creating and examining methods of chaos controlling in systems with spatiotemporal dynamics.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 1; 149-159
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Control of a Drying Process with Avoiding Cracks
Autorzy:
Galant, Alexander
Grossman, Christian
Scheffler, Michael
Wensch, Jörg
Powiązania:
https://bibliotekanauki.pl/articles/1373542.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
optimal control
penalty barrier methods
control constraints
coupled parabolic system
descretization
Opis:
The paper deals with the numerical treatment of the optimal control of drying of materials which may lead to cracks. The drying process is controlled by temperature, velocity and humidity of the surrounding air. The state equations dene the humidity and temperature distribution within a simplied wood specimen for given controls. The elasticity equation describes the internal stresses under humidity and temperature changes. To avoid cracks these internal stresses have to be limited. The related constraints are treated by smoothed exact barrier-penalty techniques. The objective functional of the optimal control problem is of tracking type. Further it contains a quadratic regularization by an energy term for the control variables (surrounding air) and barrier-penalty terms. The necessary optimality conditions of the auxiliary problem form a coupled system of nonlinear equations in appropriate function spaces. This optimality system is given by the state equations and the related adjoint equations, but also by an approximate projection onto the admissible set of controls by means of barrier-penalty terms. This system is discretized by nite elements and treated iteratively for given controls. The optimal control itself is performed by quasi-Newton techniques.
Źródło:
Schedae Informaticae; 2012, 21; 81-105
0860-0295
2083-8476
Pojawia się w:
Schedae Informaticae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the weak solutions of a coupled system of Volterra--Stieltjes integral equations
Autorzy:
Alfadel, Masouda
El-sayed, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/962154.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Coupled system
weak solution
weakly Riemann--Stieltjes integral
weakly relatively compact
Opis:
We present an existence theorem for at least one weak solution to a coupled system of Volterra--Stieltjes integral equations in a reflexive Banach space.
Źródło:
Commentationes Mathematicae; 2017, 57, 2; 143-151
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical solution of a fractional coupled system with the Caputo-Fabrizio fractional derivative
Autorzy:
Mansouri, Ikram
Bekkouche, Mohammed Moumen
Ahmed, Abdelaziz Azeb
Powiązania:
https://bibliotekanauki.pl/articles/2202061.pdf
Data publikacji:
2023
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
Caputo-Fabrizio fractional derivative
fractional integral
coupled system
fractional differential equation
fixed point
Adomian decomposition method
pochodna ułamkowa Caputo-Fabrizio
całkowanie ułamkowe
system sprzężony
ułamkowe równanie różniczkowe
punkt stały
metoda dekompozycji Adomiana
Opis:
Within this work, we discuss the existence of solutions for a coupled system of linear fractional differential equations involving Caputo-Fabrizio fractional orders. We prove the existence and uniqueness of the solution by using the Picard-Lindel ̈of method and fixed point theory. Also, to compute an approximate solution of problem, we utilize the Adomian decomposition method (ADM), as this method provides the solution in the form of a series such that the infinite series converge to the exact solution. Numerical examples are presented to illustrate the validity and effectiveness of the proposed method.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2023, 22, 1; 46--56
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New coupled atmosphere-ocean-ice system COSMO-CLM/NEMO: assessing air temperature sensitivity over the North and Baltic Seas
Autorzy:
Van Pham, T.
Brauch, J.
Dieterich, C.
Frueh, B.
Ahrens, B.
Powiązania:
https://bibliotekanauki.pl/articles/48930.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
coupled atmosphere-ocean-ice system
temperature sensitivity
air temperature
Baltic Sea
North Sea
regional climate modelling
COSMO-CLM model
Źródło:
Oceanologia; 2014, 56, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexural vibration of coupled double-walled Carbon nanotubes conveying fluid under thermo-magnetic fields based on strain gradient theory
Autorzy:
Ghorbanpour Arani, A.
Dashti, P.
Amir, S.
Yousefi, M.
Powiązania:
https://bibliotekanauki.pl/articles/949348.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
flexural vibration
conveying fluid
coupled system
thermo-magnetic fields
viscoelasticity
Opis:
The flexural vibration stability of a coupled double-walled viscoelastic carbon nanotube conveying a fluid based on the Timoshenko beam (TB) model is investigated. The coupled system is surrounded by an elastic medium which is simulated as Pasternak foundation. Van der Waals (vdW) forces between the inner and outer CNTs are taken into account based on the Lenard-Jones model. Using small scale theories, Hamilton’s principle and applying two dimensional (2D) magnetic field higher order governing equations are derived. The differential quadrature method (DQM) is applied to solve partial differential equations and investigate natural frequency of the system. The effects of viscoelastic constant, magnetic field with variable magnitudes and surface stresses on natural frequency of the structure are demonstrated in this study.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 947-957
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extremal solutions to a coupled system of nonlinear fractional differential equations with Caputo fractional derivatives
Autorzy:
Derbazi, Choukri
Baitiche, Zidane
Benchohra, Mouffak
Graef, John R.
Powiązania:
https://bibliotekanauki.pl/articles/2052385.pdf
Data publikacji:
2021
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
Caputo fractional derivative
coupled system
extremal solutions
monotone iterative technique
upper and lower solutions
pochodna ułamkowa Caputo
system sprzężony
ekstremalne rozwiązania
monotoniczna technika iteracyjna
Opis:
Using the well-known monotone iterative technique together with the method of upper and lower solutions, the authors investigate the existence of extremal solutions to a class of coupled systems of nonlinear fractional differential equations involving the $\psi$-Caputo derivative with initial conditions. As applications of this work, two illustrative examples are presented.
Źródło:
Journal of Mathematics and Applications; 2021, 44; 19-34
1733-6775
2300-9926
Pojawia się w:
Journal of Mathematics and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence and stability analysis of nonlinear sequential coupled system of Caputo fractional differential equations with integral boundary conditions
Autorzy:
Zada, Akbar
Yar, Muhammad
Li, Tongxing
Powiązania:
https://bibliotekanauki.pl/articles/744661.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
Caputo fractional derivative
Riemann–Liouville fractional integral
coupled system
existence
uniqueness
fixed point theorem
Hyers–Ulam stability
Źródło:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2018, 17
2300-133X
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of the Effect of a Sound Source Location on the Steady-State Response of a Two-Room Coupled System
Autorzy:
Meissner, M.
Powiązania:
https://bibliotekanauki.pl/articles/177058.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coupled room system
steady-state room response
potential and kinetic energy densities
localization of modes
Opis:
In this paper, the computer modelling application based on the modal expansion method is developed to study the influence of a sound source location on a steady- state response of coupled rooms. In the research, an eigenvalue problem is solved numerically for a room system consisting of two rectangular spaces connected to one another. A numerical procedure enables the computation of shape and frequency of eigenmodes, and allows one to predict the potential and kinetic energy densities in a steady-state. In the first stage, a frequency room response for several source positions is investigated, demonstrating large deformations of this response for strong and weak modal excitations. Next, a particular attention is given to studying how the changes in a source position influence the room response when a source frequency is tuned to a resonant frequency of a strongly localized mode.
Źródło:
Archives of Acoustics; 2011, 36, 4; 761-775
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency analysis of control algorithms in spatially distributed systems with chaotic behavior
Autorzy:
Korus, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/331175.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
controlling spatiotemporal chaos
coupled map lattice
system stability
Lyapunov exponent
net direction phase
stabilność układu
wykładnik Lapunowa
kierunek fazy
Opis:
The paper presents results of examination of control algorithms for the purpose of controlling chaos in spatially distributed systems like the coupled map lattice (CML). The mathematical definition of the CML, stability analysis as well as some basic results of numerical simulation exposing complex, spatiotemporal and chaotic behavior of the CML were already presented in another paper. The main purpose of this article is to compare the efficiency of controlling chaos by simple classical algorithms in spatially distributed systems like CMLs. This comparison is made based on qualitative and quantitative evaluation methods proposed in the previous paper such as the indirect Lyapunov method, Lyapunov exponents and the net direction phase indicator. As a summary of this paper, some conclusions which can be useful for creating a more efficient algorithm of controlling chaos in spatially distributed systems are made.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 4; 759-770
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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