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Wyświetlanie 1-15 z 609
Tytuł:
The questions of the dynamics of drilling bit on the surface of well bottom
Zagadnienia dynamiki narzędzi wiercących na powierzchnię dna otworu wiertniczego
Autorzy:
Burievich, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/219369.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
górotwór
wiercenie
koronki wiertnicze
mining rock
drilling
drilling bit
Opis:
The purpose of this study was to investigate the dynamics of drilling bit on the well bottom as a function of their geometrical parameters. The frame of this method for this study includes former existed objective data on the unstable drilling devices as cantilever suspension. Research methods and calculation results are as follows: square coverage by tools blade working in different rotation regime; radius of the inscribed and circumscribed circle which leads to introduce and prospectively and solve problems on process optimization of mining rock at drilling the well bottom.
W artykule przedstawiono wyniki badań dynamiki narzędzia wiercącego podczas urabiania dna otworu wiertniczego w funkcji jego parametrów geometrycznych. Przedstawiona metoda badawcza oparta jest na dostępnych danych o występujących przypadkach niestabilnej pracy narzędzi wiercących. Metody badawcze i wyniki obliczeń są przedstawione w następujących obszarach: powierzchnia pokrycia przez ostrze narzędzia dla różnych prędkości obrotowych; problemy optymalizacji procesu urabiania skały na dnie otworu wiertniczego.
Źródło:
Archives of Mining Sciences; 2016, 61, 2; 275-283
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithm for determining two-periodic steady-states in AC machines directly in time domain
Autorzy:
Sobczyk, T.J.
Powiązania:
https://bibliotekanauki.pl/articles/141171.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AC machines
steady state analysis
two-periodic solutions
analysis in time domain
discrete differential operator
iterative algorithms
Opis:
This paper describes an algorithm for finding steady states in AC machines for the cases of their two-periodic nature. The algorithm enables to specify the steady-state solution identified directly in time domain despite of the fact that two-periodic waveforms are not repeated in any finite time interval. The basis for such an algorithm is a discrete differential operator that specifies the temporary values of the derivative of the twoperiodic function in the selected set of points on the basis of the values of that function in the same set of points. It allows to develop algebraic equations defining the steady state solution reached in a chosen point set for the nonlinear differential equations describing the AC machines when electrical and mechanical equations should be solved together. That set of those values allows determining the steady state solution at any time instant up to infinity. The algorithm described in this paper is competitive with respect to the one known in literature an approach based on the harmonic balance method operated in frequency domain.
Źródło:
Archives of Electrical Engineering; 2016, 65, 3; 575-583
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of higher order forms for the description of electromechanical energy converters
Autorzy:
Sobczyk, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/141334.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
przetwornik elektromechaniczny
funkcja koenergii
prąd magnesujący
indukcyjność nieliniowa
indukcyjność dynamiczna
electromechanical converters
co-energy function
higher order forms
magnetizing current
non-linear inductances
dynamic inductances
Opis:
The purpose of that paper is to develop of unified equations of electromechanical energy converters accounting for the magnetic non-linearity of the main magnetic circuit of a converter. The concept of applying higher order forms of winding currents for the description of the co-energy function is introduced in order to derive the structure of converter equations via mathematical analysis. Also, another concept of equivalent magnetizing currents is applied to determine the higher order forms for selected converters designs. The structure of circuital equations for converters with multiple windings has been unified by means of the introduction of matrices of dynamic and nonlinear inductances following the higher order forms of the co-energy function.
Źródło:
Archives of Electrical Engineering; 2011, 60, 1; 67-75
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On determination of inductances for circuit models of AC machines
Autorzy:
Sobczyk, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/141479.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric machines
modelling magnetic non-linearity
dynamic inductances
non-linear inductances
Opis:
The paper discuss a problem of determination of inductances for AC machine windings when saturation of magnetic circuit is not neglected. For such cases, computation of magnetic field distribution in the machine magnetic circuit is a starting point for post processing procedures leading to various values, among others the co-energy in a given area and linkage fluxes of windings. This paper shows how to determine winding inductances in a nonlinear magnetic circuit from these two values and also how to compute directly nonlinear inductances. Problem is not trivial because such inductances are not uniquely determined as for linear case. In the paper a definition of nonlinear inductances is proposed which makes the choice unique.
Źródło:
Archives of Electrical Engineering; 2013, 62, 3; 487-496
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The extraterrestrial matter falls in west-central Poland (Great Poland Lowland); historical and geological data
Autorzy:
Stankowski, W. T. J.
Powiązania:
https://bibliotekanauki.pl/articles/138672.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
meteorite chronology
Great Poland Lowland
meteoryt
chronologia
Nizina Wielkopolska
Opis:
Direct and indirect evidence of falls of extraterrestrial matter in west-central Poland (Great Poland Lowland) is proved historically and environmentally. The chronological list of such events has historical (documents, medieval paintings, newspaper reports), geological and morphological documentation. The most important are the environmental sites of Morasko/Oborniki, Przełazy and Jankowo Dolne, where metallic meteorites were recognized. These meteorite falls represent a series of cosmic events: the Morasko fall was c. 5000 years BP, the Przełazy fall was c. 10000 years BP, and the age of the Jankowo Dolne fall is not fully documented.
Źródło:
Acta Geologica Polonica; 2015, 65, 2; 263-268
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling concept of NxM matrix converter under periodic control for dynamic states
Autorzy:
Sieńko, T.
Sobczyk, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/141505.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Matrix converter
control strategy
symmetrical components
equivalent Scheme
Opis:
This paper presents a concept of an NxM Matrix Converter (MC) modeling under periodic control strategy patented in Poland. This strategy allows to change an Nphase input system of voltages and current with the frequency fi to the M-phase output system with the frequency fo, maintaining both systems symmetrical and providing small distortions of voltage and current waveforms at rather high frequencies. In this paper the control strategy is extended for dynamic states when one of the frequencies is changed. Matrix converter equations have been derived using the constrain matrix, which is determined by the switch states. The equations have the hybrid form of a multi-port circuit. To simplify these equations the symmetrical components of input and output voltages and currents have been applied. As a result, rather simple equations have been found. They can be interpreted to an equivalent scheme. All considerations are illustrated using an exemplary 6H3 matrix converter.
Źródło:
Archives of Electrical Engineering; 2014, 63, 2; 305-315
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Description of matrix converter in frequency domain
Autorzy:
Borkowski, D.
Sobczyk, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/140584.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
harmonic balance method
atrix converter
requency domain
Opis:
The paper presents abilities and advantages following from the use of the harmonicbalance method for analysis of steady state of a multiphase system with switching devices on example of a matrix converter. Switching elements are modelled as resistances with step-wise variable parameters, what allows to describe the converter by a linear infinite set of equations. The analysis in frequency domain is presented on example of the one-periodic control strategy. External systems were also added using the Thevenin method approach. The numerical calculation results of a linear equations set were verified by the variable structure method in a time domain and the numerical convergence was confirmed. Furthermore, the exemplary complex system was analysed using the cascade method and current waveforms were obtained.
Źródło:
Archives of Electrical Engineering; 2013, 62, 3; 387-400
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of coefficients of multivariable power series approximating magnetic nonlinearity of AC machines
Autorzy:
Sobczyk, T. J.
Warzecha, A.
Powiązania:
https://bibliotekanauki.pl/articles/141620.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetism
magnetic field co-energy
mathematical modelling
parameters estimation
Opis:
Energy based approach was used in the study to formulate a set of functions approximating the magnetic flux linkages versus independent currents. The simplest power series that approximates field co-energy and linked fluxes for a two winding core of an induction machine are described by a set of common unknown coefficients. The authors tested three algorithms for the coefficient estimation using Weighted Least-Squared Method for two different positions of the coils. The comparison of the approximation accuracy was accomplished in the specified area of the currents. All proposed algorithms of the coefficient estimation have been found to be effective. The algorithm based solely on the magnetic field co-energy values is significantly simpler than the method based on the magnetic flux linkages estimation concept. The algorithm based on the field co-energy and linked fluxes seems to be the most suitable for determining simultaneously the coefficients of power series approximating linked fluxes and field co-energy.
Źródło:
Archives of Electrical Engineering; 2015, 64, 3; 379-389
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of commutation conditions on steady states in matrix converter
Autorzy:
Borkowski, D.
Sobczyk, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/141341.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
przekształtnik macierzowy
regulacja przepływu mocy
metoda bilansu harmonicznych
matrix converter
power flow control
harmonic balance method
Opis:
The paper investigates a significant influence of transients on steady states in a matrix converter with the one-periodic control strategy. Proposed controller can be used as an interconnection device within a power system for a power flow control. However, the presence of inductances in external systems has the significant influence on steady state of a matrix converter operation. The special current injection method has been developed to ensure a proper operation of a matrix converter. Presented analysis of steady states is carried out in a frequency domain using the harmonic balance method. Obtained numerical results, which are confirmed by a time domain analysis, prove the effectiveness of the proposed method.
Źródło:
Archives of Electrical Engineering; 2011, 60, 1; 77-83
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved algorithm for periodic steady-state analysis in nonlinear electromagnetic devices
Autorzy:
Sobczyk, T. J.
Radzik, M.
Powiązania:
https://bibliotekanauki.pl/articles/201260.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electromagnetic devices
steady-state analysis
periodic solutions
analysis in time domain
discrete differential operator
iterative algorithms
Opis:
This paper presents the improved methodology for the direct calculation of steady-state periodic solutions for electromagnetic devices, as described by nonlinear differential equations, in the time domain. A novel differential operator is developed for periodic functions and the iterative algorithm determining periodic steady-state solutions in a selected set of time instants is identified. Its application to steady-state analysis is verified by an elementary example. The modified algorithm reduces the complexity of steady-state analysis, particularly for electromagnetic devices described by high-dimensional nonlinear differential equations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 863-869
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of novel discrete differential operator of periodic function to study electromechanical interactions
Autorzy:
Sobczyk, T. J.
Radzik, M.
Powiązania:
https://bibliotekanauki.pl/articles/201412.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electromechanical system
steady state analysis
periodic solutions
analysis in time domain
discrete differential operator
iterative algorithms
system elektromechaniczny
analiza stanu ustalonego
rozwiązania okresowe
analiza w dziedzinie czasu
dyskretny operator różniczkowania
algorytm iteracyjny
Opis:
This paper investigates an algorithm for finding steady-states in electromechanical systems for the cases of their periodic nature. The algorithm enables to specify the steady-state solution identified directly in time domain. The basis for such an algorithm is a discrete differential operator that specifies the values of the first derivative of the periodic function in the selected set of points on the basis of the values of that function in the same set of points. It creates algebraic equations describing the steady-state solution for the nonlinear differential equations describing electromechanical systems. In this paper, the direct time-domain approach is tested for the simple converter considering. The algorithm used in this paper is competitive with respect to the one known in literature an approach based on the harmonic balance method operated in frequency domain.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 645-653
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On parameters determination of multi-port equivalent scheme for multi-winding traction transformers
Autorzy:
Sobczyk, T. J.
El Hayek, J.
Powiązania:
https://bibliotekanauki.pl/articles/950657.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-winding transformer
equivalent scheme
multi-port circuit
traction transformers
Opis:
This paper aims to present a new equivalent scheme of multi-windings traction transformers, based on multiport purely inductive circuit. The mathematical background of this equivalent scheme is described. The determination of the different scheme elements is made through a finite-elements calculation of both main and leakage inductances, for the case of a four-winding transformer. A procedure is defined, which allows to estimate the values of these elements from some measurements on the transformer at no-load and short-circuit operations. A specific strategy of short-circuit tests is described, allowing to determine all parameters in a rather simple way.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 17-27
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and theoretical modeling of waste combustion in a chamber with a moving grate
Autorzy:
Jaworski, T. J.
Pikoń, K.
Kajda-Szcześniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/185559.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
waste
combustion
physicochemical properties
emission of gas combustion products
quantitative evaluation indicators
marnotrawstwo
spalanie
właściwości fizykochemiczne
Opis:
The work contains a description of a developed experimental and theoretical method of modeling of solid waste combustion in a device equipped with a moving grate and capability to optimize the work of waste incineration plant. Implementation of this issue was based on results of experimental studies made on a laboratory scale boiler. This was possible by defining and testing indicators of quantitative assessment of combustion such as: reaction front rate, ignition rate, the rate of combusted mass loss and the heat release rate. These indicators as measurable "criteria indicators" allow transfer of parameters from a laboratory-scale unit, working in the transient egime into an industrial full scale grate device working continuously in stable determined conditions. This allows for wide optimization possibilities in the operation of a waste incineration plant, in particular the combustion chamber, equipped with a moving grate system.
Źródło:
Chemical and Process Engineering; 2018, 39, 1; 3-14
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy conversion in small water plants with variable speed PM generator
Autorzy:
Sobczyk, T. J.
Mazgaj, W.
Szular, Z.
Węgiel, T.
Powiązania:
https://bibliotekanauki.pl/articles/140885.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnes trwały
prądnica
prostownik PWM
mała energetyka wodna
energetyka wodna
permanent magnet generator
PWM rectifier
small hydro power
Opis:
The Small Hydro Power Plants allow to increase the energy amount from renewable sources, especially from small rivers in mountainous areas. This paper presents a new concept of a energy conversion system for application in a Small Hydropower Plant (SHP) which is based on a permanent magnet generator (PM generator) with a propeller turbine integrated with the generator rotor. The PM generator can work at a variable speed and therefore energy produced by the PM generator has to be converted by means of a power electronic unit to fit to the three-phase power grid parameters. For this concept, dimensions and parameters of the PM generator were specially designed on account of integration with water turbine. The paper precisely describes elements of energy conversion system and also presents the results of numerical tests for chosen working conditions. An original algorithm of control strategy for power electronic unit was used to adjust generated energy to the required parameters of the three-phase grid.
Źródło:
Archives of Electrical Engineering; 2011, 60, 2; 159-168
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 609

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