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Wyświetlanie 1-15 z 32
Tytuł:
Vibration control of a column with concentrated mass on by means of piezoceramic elements
Autorzy:
Sokół, K.
Powiązania:
https://bibliotekanauki.pl/articles/122332.pdf
Data publikacji:
2013
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
vibration
piezoceramic
instability
vibration control
Opis:
In this paper, the results of numerical studies on vibration control of a geometrically nonlinear column with additional mass and spring elements are presented. The external load is induced by axially applied force P with constant line of action. The additional mass element and the spring are placed on different members of the system. The boundary problem has been formulated on the basis of the Hamilton’s principle. Due to the geometrical nonlinearity of the investigated system, the solution of the problem was performed by means of the small parameter method. The main purpose of this paper is to investigate the influence of the piezoelectric force on the vibration, divergence instability and critical loading.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 4; 109-117
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On bifurcation load of a three-member slender system with an internal crack subjected to Euler’s load
Autorzy:
Uzny, S.
Sokół, K.
Powiązania:
https://bibliotekanauki.pl/articles/280847.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
column
divergence
conservative load
crack
Opis:
The results of numerical simulations presented in this paper are concerned with instability of a three member slender system subjected to Euler load. The investigated column is built up as a flat frame composed of three rods. In the internal one, the defect is present in form of a crack. The boundary problem has been formulated on the basis of a static criterion of instability. The boundary conditions associated with different types of supports are obtained by proper selection of parameters of the generalized load. On the basis of these results, the magnitude of bifurcation load can be determined.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 269-281
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Load by a force directed towards a positive pole in the aspect of studies on vibrations of a column with crack
Autorzy:
Sokół, K.
Uzny, S.
Powiązania:
https://bibliotekanauki.pl/articles/127900.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
column
crack
natural vibration
instability
characteristic curves
kolumna
pęknięcie
drgania własne
niestateczność
krzywe charakterystyczne
Opis:
In this paper the results of numerical studies on natural vibration frequency and stability of a slender supporting system loaded by external force directed towards a positive pole are presented. In the investigated structure the failure in the form of crack is present. The boundary problem is formulated on the basis of the principle of minimum action – Hamilton’s principle. The results in the non-dimensional form are plotted as the characteristic curves in the external load – natural vibration frequency plane as well as the maximum loading capacity is discussed.
Źródło:
Vibrations in Physical Systems; 2016, 27; 325-332
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical studies on stability of slender supporting structures
Autorzy:
Sokół, K.
Uzny, S.
Powiązania:
https://bibliotekanauki.pl/articles/122373.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
stability
cracks
bifurcation load
slender systems
column
stabilność
pękanięcia
obciążenia bifurkacji
systemy smukłe
kolumna nieliniowa
Opis:
In this paper the results of studies on stability of the geometrically non-linear column (slender system) composed of two rods have been presented. The supporting structure has a defect in the form of cracks which are present in each of rods. The cracks are simulated by means of rotational springs. On the basis of the total potential energy principle, the boundary problem is being formulated. The results show an influence of the crack size on the stability of the column in particular on bifurcation load magnitude.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 2; 157-165
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of slender systems by means of genetic algorithms
Autorzy:
Sokół, K.
Kulawik, A.
Powiązania:
https://bibliotekanauki.pl/articles/973636.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
crack
genetic algorithm
optimization
slender system
pęknięcie
algorytm genetyczny
optymalizacja
układ smukły
Opis:
In this paper, the results of numerical studies on optimization of a geometrically nonlinear column with an internal crack by means of genetic algorithms are presented. The system is loaded by an axially applied external force P with a constant line of action. The presented problem is formulated on the basis of the principle of stationary total potential energy. The main purpose of this paper is to investigate an influence upon the localization of the crack and flexural rigidity ratio on critical loading of the system and to find an optimum localization of the crack in order to achieve high loading capacity. In order to calculate optimum values of these parameters the genetic algorithms are implemented into computer program. The artificial method of solution of the problem has been used due to the strongly nonlinear nature of the investigated problem.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 1; 115-124
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibrations of column subjected to Euler's load with consideration of Timoshenko's theory
Autorzy:
Uzny, S.
Sokół, K.
Powiązania:
https://bibliotekanauki.pl/articles/128238.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
column
Timoshenko's theory
Bernoulli-Euler's theory
free vibrations
kinetic criterion of stability
divergence instability
characteristic curves
kolumna
teoria Timoshenki
teoria Bernoulliego-Eulera
drgania swobodne
kinetyczne kryterium stateczności
niestateczność dywergencyjna
krzywe charakterystyczne
Opis:
In this paper the single-rod cantilever column subjected to compressive Euler's load is investigated. The boundary problem has been formulated on the basis of Hamilton's principle and Timoshenko's theory. Numerical simulations of characteristic curves have been plotted on the plane external load-vibration frequency for different magnitudes of slenderness factor of the system. The results of numerical calculations of Timoshenko's beam are compared to the ones obtained from mathematical Bernoulli-Euler's model. The comparison of the results of characteristic curves calculated by means of Timoshenko's theory and Bernoulli-Euler's model are done for first three vibration frequencies.
Źródło:
Vibrations in Physical Systems; 2014, 26; 319-326
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza parametrów trakcyjnych pociągów dużych prędkości
Analys of traction parameters of high speed trains
Autorzy:
Anuszczyk, J.
Sokół, K.
Wawrzyniak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1372453.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
pojazd szynowy
pociąg
charakterystyka trakcyjna
Opis:
The current "Governmental Program of Construction and Operation of High Speed Railway in Poland" develops. Is analyzed for routing high-speed rail and widely understood aspects of power and infrastructure. Next steps include selection of stock for a new line (the line Y). Worldwide industry today has a wide range of high-speed trainsets. The article presents an analysis of traction characteristics of existing stock.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2011, 2, 90; 87-93
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania zawartości niektórych makro i mikroelementów oraz związków organicznych w igłach sosny pospolitej (Pinus silvestris L.) nawożonej siarczanem amonu
Examination of the content of certain macro- and microelements and organic compounds in needles of Scots pine (Pinus silvestris L.) fertilized with ammonium sulphate
Autorzy:
Rogaliński, K.
Lech, T.
Sokół, K.
Powiązania:
https://bibliotekanauki.pl/articles/973137.pdf
Data publikacji:
1979
Wydawca:
Polskie Towarzystwo Leśne
Źródło:
Sylwan; 1979, 123, 07; 23-32
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibrations of the partially tensioned geometrically non-linear system subjected to Euler’s load
Autorzy:
Uzny, S.
Sokół, K.
Osadnik, M.
Powiązania:
https://bibliotekanauki.pl/articles/127651.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
column
Bernoulli-Euler's theory
free vibration frequency
nonlinear system
characteristic curves
amplitude of vibration
nonlinear component of free vibrations frequency
kolumna
teoria Eulera-Bernoulliego
częstotliwość drgań własnych
układ nieliniowy
krzywe charakterystyczne
amplituda drgań
nieliniowa składowa częstości drgań własnych
Opis:
In this study the fixed-fixed column subjected to axial Euler’s load has been investigated. The load is placed between the fixed ends of the structure and its location can be changed along column’s length. The boundary problem of free vibrations of the mentioned system has been formulated on the basis of Bernoulli – Euler theory and taking into account non-linear axial deformation relationship. Due to non-linear expressions the solution of the problem was done with small parameter method. In the paper the change of the first vibration frequency in relation to location and magnitude of the loading force was obtained. The relationship between natural vibration frequency and the amplitude is also discussed.
Źródło:
Vibrations in Physical Systems; 2016, 27; 399-406
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model of a semiconductor disk laser
Autorzy:
Sokół, A. K.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/174528.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
semiconductor disk laser
SDL
vertical-external-cavity surface-emitting laser
VECSEL
computer simulation
numerical modelling
Opis:
In this paper we describe the numerical model of a semiconductor disk laser, developed and implemented in the Photonics Group, Institute of Physics, Lodz University of Technology, Poland. It consists of four strongly interrelated components for: carrier transport, heat flow, material gain and optical phenomena calculations. Combination of these components gives the steady-state self-consistent model which enables a simulation of various aspects of a semiconductor disk laser operation. A numerical analysis of carrier and power losses within the active region of 1.3-μm GaInNAs/GaAs semiconductor disk laser has been carried out using this model.
Źródło:
Optica Applicata; 2016, 46, 2; 199-211
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Pumping Beam Width on VECSEL Output Power
Autorzy:
Sokół, A. K.
Sarzała, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/226018.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
VECSEL
SDL
semiconductor disk laser
simulation
numerical modeling
power scaling
Opis:
The paper is devoted to a numerical analysis of an influence of a pumping beam diameter on output power of optically pumped vertical-external-cavity surface-emitting lasers. Simulations have been carried out for a structure with a GaInNAs/GaAs active region operating at 1.32 μm. Various assembly configurations have been considered. Results obtained show that laser power scaling is strongly affected by thermal properties of the device.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 3; 239-245
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to enhance a room-temperature operation of diode lasers and their arrays
Autorzy:
Sarzała, R. P.
Sokół, A. K.
Kuc, M.
Nakwaski, W.
Powiązania:
https://bibliotekanauki.pl/articles/174004.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
diode laser
thermal management
thermal crosstalk
semiconductor arrays
Opis:
A key problem to be solved during designing productive diode lasers and their lasing arrays is their proper thermal management enabling efficient high-power operation. Strictly speaking, the above demand leads to optimization of their structures to enhance lasing performance for high operation currents. It is well-known that deterioration of laser performance is mostly induced by excessive temperature increases within their volumes. In diode-laser arrays, additionally thermal crosstalk between array emitters should be taken into account. In the present paper, physics of heat-flux generation within the laser-diode volume and its extraction from it is analysed and described with the aid of our self-consistent simulation procedure. Then their thermal optimization is discussed including a proper design of a heat-flux generation within the laser volume, enhancement of its transport towards a laser heat-sink and, additionally in laser arrays, reduction of a thermal crosstalk between individual array emitters. The analysis is carried out using modern nitride edge-emitting ridge-waveguide lasers and their one-dimensional arrays as well as arsenide semiconductor disk lasers as typical examples of modern diode-laser designs. Physical processes responsible for heat-flux generation within these devices and heat-flux extraction from their volumes are analysed and an impact of some construction details on these processes is explained.
Źródło:
Optica Applicata; 2016, 46, 2; 213-226
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation of clinical symptoms, endoscopic features and density of oesophageal eosinophilia in children with newly-diagnosed eosinophilic esophagitis
Autorzy:
Załęski, A.
Banasiuk, M.
Sokół-Łupińska, K.
Karolewska-Bochenek, K
Banaszkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/28762734.pdf
Data publikacji:
2021
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2021, 28, 3; 404-408
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ITO layer as an optical confinement for nitride edge-emitting lasers
Autorzy:
Kuc, M.
Sokół, A. K.
Piskorski, Ł.
Dems, M.
Wasiak, M.
Sarzała, R. P.
Czyszanowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/200863.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
edge-emitting lasers
InGaN/GaN
computer simulation
ITO
optical confinement
Opis:
This paper presents the results of a numerical analysis of nitride-based edge-emitting lasers with an InGaN/GaN active region designed for continuous wave room temperature emission of green and blue light. The main goal was to investigate whether the indium thin oxide (ITO) layer can serve as an effective optical confinement improving operation of these devices. Simulations were performed with the aid of a self-consistent thermal-electrical-optical model. Results obtained for green- and blue-emitting lasers were compared. The ITO layer in the p-type cladding was found to effectively help confine the laser mode in the active regions of the devices and to decrease the threshold current density.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 147-154
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 32

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