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Wyświetlanie 1-15 z 73
Tytuł:
Recurrence relations for two-channel queueing systems with Erlangian service times and hysteretic strategy of random dropping of customers
Autorzy:
Zhernovyi, Y.
Kopytko, B.
Powiązania:
https://bibliotekanauki.pl/articles/122986.pdf
Data publikacji:
2018
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
two-channel queueing system
Erlangian service times
random dropping of customers
fictitious phase method
hysteretic strategy
recurrence relations
steady-state characteristics
czas obsługi Erlanga
strategia histeretyczna
system kolejkowania dwukanałowy
Opis:
This article proposes a method of study the M/Es/2/m and M/Es/2/∞ queueing systems with a hysteretic strategy of random dropping of customers. Recurrence relations are obtained to compute the stationary distribution of the number of customers and steadystate characteristics. The constructed algorithms were tested on examples with the use of simulation models constructed with the help of GPSS World.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2018, 17, 2; 93-103
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic characteristics of magnetic coupling in horizontal axis wave energy device
Autorzy:
Zhang, J.
Liu, Y.
Liu, J.
He, T.
Xie, Y.
Powiązania:
https://bibliotekanauki.pl/articles/258488.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
wave energy
magnetic coupling
dynamic characteristics
transfer function
step response
steady state error
Opis:
To solve the dynamic response problems of magnetic coupling in the horizontal axis wave energy device, this has researched the dynamic characteristicsof magnetic coupling. The fitting formula about torque and angle of the magnetic coupling is obtained through experiments. The mathematical models of the magnetic coupling torque transmission are established. The steady state error of the magnetic coupling and the transfer function of the output angle are obtained. The analytical solution of the step response of the output angle in time domain is derived. The influence of the torsional rigidity, the damping coefficient and the driven rotor’s rotational inertia on dynamic characteristics of the magnetic coupling isanalyzed. According to the analysis results, the design rules of magnetic coupling are proposed.
Źródło:
Polish Maritime Research; 2017, S 3; 165-170
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experiments and FE Analyses on Airborne Sound Properties of Composite Structural Insulated Panels
Autorzy:
Wawrzynowicz, A.
Krzaczek, M.
Tejchman, J
Powiązania:
https://bibliotekanauki.pl/articles/177722.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic properties
composite structural insulated panel
sound insulation
finite element method
steady state analysis
transient analysis
Opis:
Airborne acoustic properties of composite structural insulated panels CSIPs composed of fibre- magnesium-cement facesheets and expanded polystyrene core were studied. The sound reduction ratings were measured experimentally in an acoustic test laboratory composed of two reverberation chambers. The numerical finite element (FEM) model of an acoustic laboratory available in ABAQUS was used and verified with experimental results. Steady-state and transient FE analyses were performed. The 2D and 3D modelling FE results were compared. Different panel core modifications were numerically tested in order to improve the airborne sound insulation of CSIPs.
Źródło:
Archives of Acoustics; 2014, 39, 3; 351-364
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ charakterystyk eksploatacyjnych sieci przemysłowych na dobór parametrów filtrów harmonicznych
Impact of industrial network operating characteristics on the harmonic filter parameters sizing
Autorzy:
Warecki, Jurij
Gajdzica, Michał
Powiązania:
https://bibliotekanauki.pl/articles/268765.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
filtr wyższych harmonicznych
stany ustalone
stany przejściowe
bateria kondensatora
dławik filtrujący
harmonic filter
steady state
transients
capacitor bank
air-core filter reactor
Opis:
Układy kompensacji mocy biernej oraz filtracji, oparte na kondensatorach znajdują powszechne zastosowanie w praktycznych rozwiązaniach systemów przemysłowych. Ich parametry znamionowe wyznaczane są wyłącznie w oparciu o harmoniczne prądów oraz napięć w stanach ustalonych, niemniej jednak tyczy się to głównie jednostek filtrujących o prostej topologii. Stąd, mając na uwadze bardziej złożone układy w większości przypadków istniejących lub nowoprojektowanych obiektów wymaga się, aby analizowane układy były dostosowane do pracy zarówno w warunkach ustalonych jak i przejściowych. Korzystając ze standardów oraz norm, w artykule omówiono procedurę doboru parametrów baterii kondensatorów oraz dławików układów filtrujących z pozycji ich bezawaryjnej pracy w elektrycznych sieciach przemysłowych. Zaproponowana metoda ma wspomóż działania projektowe filtrów harmonicznych.
The application of harmonic filter circuit based on power capacitor banks are widely used in practical solutions in industrial systems. The component ratings of these units are often specified based solely on a combination of steady state fundamental and harmonic voltages and currents. Although, this may be adequate in single-tuned or single branch units and method may not properly rate the components for more complex applications such as multiple, single-tuned harmonic filter circuits in compensated installations. Thus, in the most cases of commonly used or newly designed circuits are required to be adapted to operate as well in steady state and transients conditions. Using the exsisting Standards, the article propose a method for determining equipment ratings parameters of the capacitor banks and air-core filter reactors according to malfunctions. The study illustrated in this paper will be used to support and improve harmonic filter realiability and design. It is hoped that ideas will be a resource for a future filter application guide being contemplated by the capacitor subcommittee.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2019, 67; 47-51
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of integrodifferential control system with pulse-width modulated sampler on Banach spaces
Autorzy:
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/255995.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
integrodifferential system
pulse-width modulated sampler
steady-state control
steady-state stability
Opis:
This paper studies steady-state control and stability for a class of integrodifferential control system with pulse-width modulated sampler on Banach spaces. The existence and stability of the steady-state for the integrodifferential control system with pulse-width modulated sampler are given. An example is given to illustrate the theory.
Źródło:
Opuscula Mathematica; 2012, 32, 1; 179-197
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence and stabilizability of steady-state for semilinear pulse-width sampler controlled system
Autorzy:
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/255665.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
pulse-width sampler system
compact semigroup
steady-state
existence
stabilizability
Opis:
In this paper, we study the steady-state of a semilinear pulse-width sampler controlled system on infinite dimensional spaces. Firstly, by virtue of Schauder's fixed point theorem, the existence of periodic solutions is given. Secondly, utilizing a generalized Gronwall inequality given by us and the Banach fixed point theorem, the existence and stabilizability of a steady-state for the semilinear control system with pulse-width sampler is also obtained. At last, an example is given for demonstration.
Źródło:
Opuscula Mathematica; 2011, 31, 1; 105-118
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bifurcation in a nonlinear steady state system
Autorzy:
Wang, G. Q.
Cheng, S. S.
Powiązania:
https://bibliotekanauki.pl/articles/255541.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
bifurcation
cellular neural network
steady state
Krasnoselsky fixed point theorem
Opis:
The steady state solutions of a nonlinear digital cellular neural network with ω neural units and a nonnegative variable parameter λ are sought. We show that λ = 1 is a critical value such that the qualitative behavior of our network changes. More specifically, when ω is odd, then for λ ∈ [0, 1), there is one positive and one negative steady state, and for λ ∈ [1, ∞), steady states cannot exist; while when ω is even, then for λ ∈ [0, 1), there is one positive and one negative steady state, and for λ = 1, there are no nontrivial steady states, and for λ ∈ (1, ∞), there are two fully oscillatory steady states. Furthermore, the number of existing nontrivial solutions cannot be improved. It is hoped that our results are of interest to digital neural network designers.
Źródło:
Opuscula Mathematica; 2010, 30, 3; 349-360
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic analysis of the transient phase and steady state of open multicyclic enzyme cascades
Autorzy:
Varón, Ramón
Havsteen, Bent
Valero, Edelmira
Molina-Alarcón, Milagros
García-Cánovas, Francisco
García-Moreno, Manuela
Powiązania:
https://bibliotekanauki.pl/articles/1041315.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
steady state
fractional modification
transient phase
enzyme kinetics
multicyclic cascades
Opis:
This paper presents a kinetic analysis of the whole reaction course, i.e. of both the transient phase and the steady state, of open multicyclic enzyme cascade systems. Equations for fractional modifications are obtained which are valid for the whole reaction course. The steady state expressions for the fractional modifications were derived from the latter equations since they are not restricted to the condition of rapid equilibrium. Finally, the validity of our results is discussed and tested by numerical integration. Apart from the intrinsic value of knowing the kinetic behaviour of any of the species involved in any open multicyclic enzyme cascade, the kinetic analysis presented here can be the basis of future contributions concerning open multicyclic enzyme cascades which require the knowledge of their time course equations (e.g. evaluation of the time needed to reach the steady state, suggestion of kinetic data analysis, etc.), analogous to those already carried out for open bicyclic cascades.
Źródło:
Acta Biochimica Polonica; 2005, 52, 4; 765-780
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A discussion on the optimality of bulk entry queue with differentiated hiatuses
Autorzy:
Vadivukarasi, Manickam
Kalidass, Kaliappan
Powiązania:
https://bibliotekanauki.pl/articles/2175843.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
differentiated hiatus time
steady state probability
waiting-time distribution
optimization of expenses
Opis:
We consider Markovian differentiated hiatuses queues with bulk entries. With the help of the matrix geometric method, we discuss the stability condition for the existence of the steady-state solution of our model and we obtain the stationary system size by using a probability generating function. The stochastic decomposition form of stationary system size and the waiting time distribution of an arbitrary beneficiary are also analysed. Furthermore, we perform the expense analysis using the particle swarm optimization technique and we obtain the optimality of service rate and hiatus rate. Finally, we study the effects of changes in the parameters on some important performance measures of the system through numerical observations.
Źródło:
Operations Research and Decisions; 2022, 32, 2; 137--150
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stator current spectrum analysis of a double cage induction motor with rotor asymmetry
Autorzy:
Tulicki, Jarosław
Sobczyk, Tadeusz Jan
Sułowicz, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/24202742.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
cage asymmetry
double cage induction motor
harmonic balance method
steady-state analysis
stator current Fourier spectra
Opis:
This study presents a method to directly calculate the stator current Fourier spectra in double-cage induction motors to diagnose faults in rotor cages. A circuit model is developed for this purpose, allowing the modelling of any asymmetry in the outer and inner rotor cages. The model extends the conventional model of a cage motor by considering the higher space harmonics generated by the stator windings. The asymmetry of the cages is modelled by growing the resistance of any of the rotor bars. This results in various model equations, to be solved by looking for diagnostic signals. Motor current signature analysis is typically used to diagnose cage motors based on the Fourier spectra of the stator currents during steady-state operation. This study determines these spectra for double cage motors using the harmonic balance method, omitting the transient calculations. The calculation results confirmed the sensitivity of the stator current Fourier spectra as a diagnostic signal to distinguish faults in the outer and inner cages.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 357--371
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified integer model for solving the master bay problem
Autorzy:
Tsymbal, M.
Kamieniev, K.
Powiązania:
https://bibliotekanauki.pl/articles/2063952.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
ship operation problem
master bay problem
integer model
modified integer model
genetic algorithm
steady-state genetic algorithm
numerical experiment
feasibility study
Opis:
One of key components in keeping a ship seaworthy is a correctly prepared cargo plan. Considering the recent cost cutting measures and reduced transportation volumes relevance of optimizing such a plan cannot be understated. Though there’s a number of studies addressing the issue none of them covers all the operational and constructional constraints necessary to factor for. This article presents an integer model that tries to address some of the constraints missed by other researches. A method for solving the model is designed and developed based on a steady-state genetic algorithm. A numerical experiment is conducted showing the method’s feasibility.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 749--753
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new closed loop speed control strategy for a vector controlled three-phase induction motor drive
Autorzy:
Tripathi, A.
Dey, A.
Dwivedi, B.
Singh, B.
Chandra, D.
Powiązania:
https://bibliotekanauki.pl/articles/262777.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
space vector modulation
VSI
induction motor model
transients
steady state value
Opis:
This paper presents a completely mathematical equations based model on control of torque and speed of a three-phase indirect vector controlled VSI fed cage induction motor drive that is controlled through the space vector modulated method. This enables a wide range of acceptability of the model for various values of load and for various types and ratings of induction motors. The uniqueness of the model lies in the fact that the deviations in the torque and speed on sudden application of reference step change in speed values are minimum i.e. when any sudden change in the speed reference is desired, the speed and torque waveforms reveal that the time taken in coming back to their final steady state values is very less and the motor overcomes the perturbation with negligible transients. The same is verified through the simulated results.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 67-72
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rationalization of the energy consumption of road transport for sustainable development
Autorzy:
Szaruga, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/135696.pdf
Data publikacji:
2020
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
energy consumption
freight road transport
rationalization
steady-state economy
sustainable development
vector error correction model
Opis:
This paper presents an approach to rationalize the energy consumption of road transport towards sustainability in a steady-state economy. The research hypothesis is that the rationalization of the energy consumption of road transport is affected by drift and shocks, which desynchronizes the adjustment mechanism from equilibrium. The objective of this research was to incorporate the model of energy consumption of road freight transport with the goals of sustainability by considering ecological and constructivist rational orders, the issue of order drift, and the occurrence of shocks. The research investigated Poland from the first quarter of 2004 to the fourth quarter of 2018. A model for rationalizing the energy consumption of road transport was constructed using the vector error correction model and cointegration techniques. The model revealed one cointegrating relationship and showed statistically significant unlimited drift. The level of changes to long-term equilibrium appeared respectively for GDP – 1.8%, PPI for energy – 7.3%, and for energy consumption – 10.9%. We observed a weak sustainability between the energy consumption of road transport and GDP and a strong sustainability between energy consumption of road transport and PPI energy. It was determined that price shocks had a positive impact (at the estimated point level around 0.06) and supply and demand shocks had a negative impact (at the level estimated point around –3).
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 62 (134); 36-42
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat conduction in anisotropic medium with perfectly conductive thread-like inclusions
Autorzy:
Sulym, Heorhiy
Ilchuk, Nataliia
Pasternak, Iaroslav
Powiązania:
https://bibliotekanauki.pl/articles/387323.pdf
Data publikacji:
2019
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
thread-like inclusion
steady-state heat conduction
anisotropy
boundary integral equation
hypersingular
Opis:
The paper presents a novel approach for the analysis of steady-state heat conduction of solids containing perfectly conductive thread-like inhomogeneities. Modelling of a thread-like heat conductive inhomogeneity is reduced to determination of density of heat distributed along a spatial curve, which replaces the inclusion. Corresponding boundary integral equations are obtained for anisotropic solids with thread-like inclusions. Non-integral terms are computed in a closed form. It is shown that, nevertheless the singularity of the equation is 1/r, it is hypersingular, since the kernel is symmetric. Boundary element approach is adopted for solution of the obtained equations. Numerical example is presented for a rectilinear conductive thread, which verifies derived boundary integral equations.
Źródło:
Acta Mechanica et Automatica; 2019, 13, 4; 251-254
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of pressure loss in steerable tyre wheel on steerability of four-axle special purpose vehicle
Wpływ utraty ciśnienia w ogumieniu koła kierowanego na kierowalność czteroosiowego pojazdu specjalnego
Autorzy:
Stryjek, P.
Motrycz, G.
Pieniążek, W.
Powiązania:
https://bibliotekanauki.pl/articles/347148.pdf
Data publikacji:
2013
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
AFVs
tires
pressure
damage
steady state circular test
steerability characteristics
double lane change
loss of lateral stability
transportery opancerzone
opony
ciśnienie
uszkodzenia
ustalona jazda po okręgu
podwójna zmiana pasa ruchu
charakterystyka kierowalności
utrata stateczności poprzecznej
Opis:
The authors of this paper took a part in a government research project on the behavior of a military AFV after an explosive damage to its tires, which inter alia aims to assess its motion-al abilities, also in terms of ensuring the safety of the crew. The results presented hereto refer to a part of preliminary experimental studies on a four-axle vehicle with a total weight of 22,000 kg and a length of 8m, carried out in the situations of a substantial or complete loss of tire pressure in the first steerable wheels axle. A significant influence of the total pressure loss in the drivability of the vehicle has been proven.
Autorzy niniejszej pracy uczestniczyli w rządowym projekcie badawczym dotyczącym problemu zachowania się transportera wojskowego po eksplozyjnym uszkodzeniu ogumienia, który miał na celu, między innymi, ocenę jego możliwości ruchowych, w aspekcie zapewnienia bezpieczeństwa załogi. Przedstawione wyniki dotyczą fragmentu wstępnych badań eksperymentalnych pojazdu czteroosiowego o masie całkowitej 22.000 kg i długości 8m, przeprowadzonych w sytuacjach znacznej lub całkowitej utraty ciśnienia w ogumieniu koła pierwszej osi kierowanej. Wykazano znaczny wpływ całkowitej utraty ciśnienia na kierowalność pojazdu.
Źródło:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2013, 4; 92-100
1731-8157
Pojawia się w:
Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 73

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