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Wyświetlanie 1-15 z 29
Tytuł:
Modeling of frequency response of transformer winding with axial deformations
Autorzy:
Gawrylczyk, K. M.
Banaszak, S.
Powiązania:
https://bibliotekanauki.pl/articles/140733.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transformer
winding
frequency response analysis (FRA)
lumped parameters method
transmission line method
Opis:
One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows to determine the mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. Still pending problem is interpretation of measurements results. One of approaches is application of computer modeling to simulate various failure modes and connected with them changes in FRA response. The paper presents two types of models, one based on lumped parameters with RLC elements, and one based on distributed parameters with TLM method. Both methods give similar results, comparable to real measurements of simulated coil.
Źródło:
Archives of Electrical Engineering; 2014, 63, 1; 5-17
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method of precise pulse onset determination using the Akaike Information Criterion for Ultrasound Transmission Tomography
Autorzy:
Pruchnicki, Piotr
Opieliński, Krzysztof J.
Powiązania:
https://bibliotekanauki.pl/articles/2146650.pdf
Data publikacji:
2021
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
Akaike Information Criterion
AIC
pulse wave
transmission method
ultrasound tomography
kryterium informacyjne Akaike
fala tętna
metoda transmisyjna
tomografia ultradźwiękowa
Opis:
Information criteria used in statistics for model selection can be used to accurately determine pulse transition times in transmission methods. The most popular information criteria are the Akaike Information Criterion (AIC) and the Bayesian Schwartz Criterion (BIC). These criteria are considered the most reliable tests of model type and structure and are computationally simple. In this paper, an algorithm developed according to the AIC criterion is used to determine the transition time from transmission tomography measurements acquired with a multi-element ultrasonic ring array, which is the scanning element of the novel prototype of ultrasound tomography device for detecting and estimating the malignancy of female breast cancer in vivo. As a result, a new algorithm was developed to precise search for the onset of the recorded receiving pulse. The algorithm was tested in an aqueous environment using elementary pairs of transmitting and receiving ultrasonic transducers of a tomographic ring array.
Źródło:
Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021115
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Attenuation Performance Analysis and Optimisation of Expansion Chamber Coupled Micro-perforated Cylindrical Panel Using Response Surface Method
Autorzy:
Alisah, Mohamad Izudin
Ooi, Lu Ean
Ripin, Zaidi Mohd
Yahaya, Ahmad Fadzli
Ho, Kelvin
Powiązania:
https://bibliotekanauki.pl/articles/1945638.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
micro-perforated cylindrical panel
transmission loss
boundary element method
response surface method
Opis:
This paper describes the boundary element method (BEM) and the experimental and optimisation studies conducted to understand the potential of expansion chamber coupled micro-perforated cylindrical panel (MPCP) in enhancing the acoustic attenuation for in-duct noise control issues. Owing to the complex structure of the MPCP and to achieve the correct prediction of acoustic attenuation, BEM is adopted on the basis of the Simcenter 3D software to compute the sound transmission loss (TL), As the MPCP is cylindrical in shape with numbers of sub-milimeter holes, additive manufacturing-based 3D printing is utilised for the model prototyping to reduce current design limitation and enable fast fabrication. The TL measurement-based two-load method is adopted for model validation. Subsequently, parametric studies of the MPCP concerning the perforation hole diameter, perforation ratio and depth of air space are carried out to investigate the acoustic performance. Optimisation via response surface method is used as it allows for evaluating the effects of multiple parameters as required in this study. The model validation result shows that the error between the BEM and the measured values is relatively small and shows good agreement. The R-square value is 0.89. The finding from the parametric studies shows that a wider peak attenuation can be achieved by reducing the perforation hole diameter, and one way to increase the TL amplitude is by increasing the air cavity depth. Finally, the optimised MPCP model is adopted to the commercial vacuum cleaner for verification. The sound pressure level of the vacuum cleaner is significantly attenuated within the objective frequency of 1.7 kHz.
Źródło:
Archives of Acoustics; 2021, 46, 3; 507-517
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of through transmission laser welding of Nylon6 by finite element simulation
Autorzy:
Gupta, S. K.
Pal, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/407048.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser transmission welding
simulation
through transmission laser welding
glass transition temperature
finite element method
Opis:
Over the years laser welding has evolved as a fabrication process capable of overcoming the limitations of conventional joining methodologies. It facilitates the welding of diverse range of materials like metals, non-metals, polymers etc. Laser transmission welding is a technique employed for fabricating intricate shapes/contours in polymers with better precision compared to the other conventional processes. Nylon6, a synthetic semi-crystalline polymer is utilized as an engineering thermoplastic due to its high strength and temperature resistant properties. In the earlier researches, various welding techniques were employed for the fabrication of polymers and metals keeping the laser beam stagnant, and much emphasis was given only to temperature distribution along the different axes and limited attention was given to residual stress analysis. Therefore, in this research work, a three-dimensional time-dependent model using a moving laser beam is used to fabricate unreinforced Nylon6 specimens.
Źródło:
Management and Production Engineering Review; 2018, 9, 4; 56-69
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D Modeling of Wave Propagation in Shallow Water by the Method of Characteristics
Autorzy:
Khalilabadi, Mohammad Reza
Powiązania:
https://bibliotekanauki.pl/articles/31340098.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
wave propagation
shallow water
MOC method
waveguide
transmission loss
Opis:
In this paper, a 2D numerical modeling of sound wave propagation in a shallow water medium that acts as a waveguide, are presented. This modeling is based on the method of characteristic which is not constrained by the Courant–Friedrichs–Lewy (CFL) condition. Using this method, the Euler time-dependent equations have been solved under adiabatic conditions inside of a shallow water waveguide which is consists of one homogeneous environment of water over a rigid bed. In this work, the stability and precision of the method of characteristics (MOC) technique for sound wave propagation in a waveguide were illustrated when it was applied with the semi-Lagrange method. The results show a significant advantage of the method of characteristics over the finite difference time domain (FDTD) method.
Źródło:
Archives of Acoustics; 2022, 47, 3; 407-412
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-Objective Optimization of Acoustical Properties of PU-Bamboo-Chips Foam Composites
Autorzy:
Jiang, Y.
Chen, S.
Wang, D.
Chen, J.
Powiązania:
https://bibliotekanauki.pl/articles/177709.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vehicle sound package
sound absorption coefficient
transmission loss
Taguchi method
Opis:
In this study, an effective optimization approach was proposed to improve acoustical behaviors of PU foams. The important parameters of PU foams: content of water, silicone oil and catalyst A1 were chosen and their effects on sound absorption coefficient and transmission loss of PU foams were studied by using Taguchi methods. In addition, bamboo chips were incorporated into PU foams as fillers to improve the acoustical properties of PU foams. Four controlled factors: the content of water, silicone oil, catalyst A1 and bamboo chips with three levels for each factor were chosen and Taguchi method based on orthogonal array L9 (34) was employed to conduct the experiments. Based on the results of Taguchi’s orthogonal array L9 (34), signal-to noise (S/N) analysis was used and developed to determine an optimal formulation of PU-bamboo-chips foam composites.
Źródło:
Archives of Acoustics; 2017, 42, 4; 707-714
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo calculations of low energy positrons in silicon
Autorzy:
Aydin, A.
Powiązania:
https://bibliotekanauki.pl/articles/148795.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Monte Carlo method
positron transmission
backscattering
angular distribution
energy distribution
Opis:
Theoretical data for positron scattering from a thin silicon film and semi-infinite silicon are presented as a function of incident and outgoing angles and energies. These theoretical data of the scattering processes of low energy positrons penetrating into silicon were performed by Monte Carlo simulation. The simulation is based on the use of different types of differential cross sections for individual elastic and inelastic scattering i) inelastic scattering; Gryzinski's excitation function to simulate the energy loss and Liljequist's model to calculate the inelastic scattering cross section, ii) elastic scattering; the screened Rutherford differential cross section with the spin-relativistic factor. In calculations on positron traversing matter, it is important to know the transmission through medium, their path lengths, and their energy and angular distribution through matter. The simulation results are well agreed with experiments.
Źródło:
Nukleonika; 2005, 50, 1; 37-42
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the impact of 220 kV SISFCL on the distance protection for transmission line
Autorzy:
Luo, Y.
Shi, T.
Huang, L.
Powiązania:
https://bibliotekanauki.pl/articles/141728.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SISFCL
distance protection
EMTDC/PSCAD
220 kV transmission line
setting method
Opis:
As the most typical application of superconducting technology, the Saturated Iron core Superconducting Fault Current Limiter (SISFCL) is a kind of ideal high voltage limiter, which can achieve noticeable limiting endless stream and has wide application prospect. However, the selectivity and sensitivity of the distance protection (DP) in the high voltage transmission network would be affected by the impedance characteristics of SISFCL. For these problems, firstly the structure and the working principle of the SISFCL are introduced briefly. Secondly, the impact mechanisms of 220 kV SISFCL on the original distance protection for the transmission line (TL) are analyzed. Then two methods of eliminating influences are deduced from the previous analysis and an improved setting method based on SISFCL for distance protection is proposed. Finally, we used EMTDC/PSCAD software to build the 220 kV SISFCL and distance protection model in the transmission network. The simulation results demonstrate that the proposed setting strategy can effectively improve the selectivity and sensitivity of distance protection and provide a reference for the practical applications of SISFCL applied to the transmission line.
Źródło:
Archives of Electrical Engineering; 2018, 67, 1; 151-163
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza metod zapewnienia bezpieczeństwa transmisji danych w systemach automatyki kolejowej
Analysis of methods to ensure the security of data transmission in the railway traffic control systems
Autorzy:
Nowakowski, W.
Łukasik, Z.
Chrzan, M.
Powiązania:
https://bibliotekanauki.pl/articles/250877.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy TTS
Tematy:
automatyka kolejowa
bezpieczeństwo
transmisja danych
transmisja bezprzewodowa
metoda kryptograficzna
automatic train
security
data transmission
wireless transmission
cryptographic method
Opis:
Rozwój systemów automatyki kolejowej jest procesem badawczym, w którym dąży się m.in. do stosowania nowoczesnych technologii [1, 15, 16]. Jednym z aktualnych obszarów badawczych jest zapewnienie bezpieczeństwa bezprzewodowej transmisji danych w rozproszonych systemach automatyki kolejowej [5, 6, 7, 8]. W artykule przedstawiono analizę metody zapewnienia bezpieczeństwa transmisji danych w rozproszonych systemach wykorzystujących transmisję bezprzewodową. Szczególną uwagę poświęcono ocenie wybranych metod kryptograficznych.
Development of railway traffic control systems is the research process, which aim is, among others, to implement the modern technologies in such systems. One of the current research areas is to provide the security of wireless data transmission in distributed railway traffic control systems. In the article an analysis of the current methods which ensure the security of wireless data transmission in distributed systems were presented. Particular attention was given to the assessment of selected cryptographic methods
Źródło:
TTS Technika Transportu Szynowego; 2016, 12; 168-171
1232-3829
2543-5728
Pojawia się w:
TTS Technika Transportu Szynowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propozycja numerycznej metody obniżenia wibroaktywności korpusu przekładni
Proposition of the numeric method in reducing the vibroactivity of the transmission housing
Autorzy:
Figlus, T.
Wilk, A.
Madej, H.
Powiązania:
https://bibliotekanauki.pl/articles/256208.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
wibroaktywność
przekładnia zębata
metoda elementów skończonych
vibroactivity
transmission
finite element method
Opis:
W pracy przedstawiono propozycję metody oceny wibroaktywności korpusu przekładni zębatej. Oceniano możliwości obniżenia wibroaktywności korpusu przez zastosowanie dodatkowego użebrowania. Przeprowadzano analizę modalną i wyznaczano łączną miarę wibroaktywności górnej płyty korpusu przekładni na podstawie zmian amplitud normalnych prędkości drgań węzłów obliczeniowych modelu MES, przy wymuszeniu impulsowym w węźle łożyskowym. Analizując otrzymane wyniki obliczeń, zaproponowano rozwiązanie konstrukcyjne użebrowania, które umożliwia znaczące obniżenie wibroaktywności górnej płyty korpusu, a tym samym całej przekładni, przy nieznacznym wzroście masy korpusu.
The paper presents a method for assessing the vibroactivity of the transmission housing. It has been assessed that, by using an additional rib, it would be possible to reduce the vibroactivity of the housing. A modal analysis has been conducted, and the combined measure of vibroactivity of the upper part of the transmission housing has been set, on the basis of the amplitude change of the normal vibration velocity of the computational model FEM assembly, by the impulse activity in the bearing assembly. Analysing the results, a rib construction has been proposed. Such a construction makes it possible to reduce vibroactivity of the upper part of the housing, as well as the whole transmission with a minimum weight increase of the housing.
Źródło:
Problemy Eksploatacji; 2009, 2; 29-38
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Effect of Uncertainties on the Acoustic Behavior of a Porous Material Located in a Duct Element Using the Monte Carlo Method
Autorzy:
Hannachi, Hanen
Trabelsi, Hassen
Kani, Marwa
Taktak, Mohamed
Chaabane, Mabrouk
Haddar, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/31339920.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
porous material
physical parameters
transmission loss
acoustic power attenuation
Monte Carlo
method
Opis:
When studying porous materials, most acoustical and geometrical parameters can be affected by the presence of uncertainties, which can reduce the robustness of models and techniques using these parameters. Hence, there is a need to evaluate the effect of these uncertainties in the case of modeling acoustic problems. Among these evaluation methods, the Monte Carlo simulation is considered a benchmark for studying the propagation of uncertainties in theoretical models. In the present study, this method is applied to a theoretical model predicting the acoustic behavior of a porous material located in a duct element to evaluate the impact of each input error on the computation of the acoustic proprieties such as the reflection and transmission coefficients as well as the acoustic power attenuation and the transmission loss of the studied element. Two analyses are conducted; the first one leads to the evaluation of the impacts of error propagation of each acoustic parameter (resistivity, porosity, tortuosity, and viscous and thermal length) through the model using a Monte Carlo simulation. The second analysis presents the effect of propagating the uncertainties of all parameters together. After the simulation of the uncertainties, the 95% confidence intervals and the maximum and minimum errors of each parameter are computed. The obtained results showed that the resistivity and length of the porous material have a great influence on the acoustic outputs of the studied model (transmission and reflection coefficients, transmission loss, and acoustic power attenuation). At the same time, the other physical parameters have a small impact. In addition, the acoustic power attenuation is the acoustic quantity least impacted by the input uncertainties.
Źródło:
Archives of Acoustics; 2023, 48, 1; 81-91
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the separation methods of optical spectra for individual components
Analiza metod separacji widm optycznych dla indywidualnych składników
Autorzy:
Makhniy, V.
Kinzerska, O.
Senko, I.
Powiązania:
https://bibliotekanauki.pl/articles/407829.pdf
Data publikacji:
2018
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
optical spectrum
separation method
luminescence
transmission
widmo optyczne
metoda separacji
luminescencja
transmisja
Opis:
A comparative analysis of various methods for the decomposition of broad bands into individual components has been carried out. It is shown that the most universal are the methods of modulation spectroscopy and direct differentiation of conventional spectral characteristics, which, unlike the widely used Alentsev-Fock method, are applicable to spectra of any type (luminescence, transmission, absorption, etc.). The features and capabilities of the direct differentiation method are used to identify the structure in the emission spectra and transmission of ZnSe single-crystal substrates.
Przeprowadzono analizę porównawczą różnych metod dekompozycji szerokich pasm na poszczególne składniki. Pokazano, że najbardziej uniwersalne są metody spektroskopii modulacyjnej i bezpośrednie różnicowanie konwencjonalnych charakterystyk spektralnych, które w przeciwieństwie do powszechnie stosowanej metody Alentseva-Focka mają zastosowanie do widm dowolnego rodzaju (luminescencja, transmisja, absorpcja itp.). Cechy i możliwości bezpośredniej metody różnicowania są stosowane do identyfikacji struktury w widmach emisyjnych i transmisyjnych monokrystalicznych składników ZnSe .
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 4; 8-11
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of the influence of ribs shape on the gear transmission housing vibroactivity
Badania wpływu kształtu użebrowania korpusu na wibroaktywność przekładni
Autorzy:
Figlus, T.
Wilk, A.
Madej, H.
Powiązania:
https://bibliotekanauki.pl/articles/374107.pdf
Data publikacji:
2010
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
przekładnia
wibroaktywność
metoda elementów skończonych
MES
gear transmission
vibroactivity
finite element method
FEM
Opis:
The paper presents the results of model studies aimed at reducing the vibroactivity of the toothed gear housing. The effect was analyzed of the shape of additional ribs on changes of the forms of vibration of the upper housing plate and on its vibroactivity. Simulations were conducted using the Finite Element Method (FEM). Based on the studies performed, the shape of ribs with dimensions ensuring a reduction of vibroactivity by several dB was determined, with a minor increase of the housing weight.
Praca przedstawia wyniki badan modelowych nad obniżaniem wibroaktywności korpusu przekładni zębatej. Analizowano wpływ kształtu dodatkowego użebrowania na zmiany postaci drgań górnej płyty korpusu oraz na jej wibroaktywność. Symulacje prowadzono z wykorzystaniem MES. Na podstawie przeprowadzonych badań wyznaczono kształt żeber o wymiarach zapewniających obniżenie wibroaktywności o kilka dB, przy niewielkim wzroście masy korpusu.
Źródło:
Transport Problems; 2010, 5, 1; 63-69
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Possibility of Using Selected Hash Functions Submitted for the SHA-3 Competition in the SDEx Encryption Method
Autorzy:
Hłobaż, Artur
Powiązania:
https://bibliotekanauki.pl/articles/2055243.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
secure communication
data encryption
data security
secure transmission
secure data exchange method
SDEx method
end-to-end data security
Opis:
The paper presents analysis of the possibility of using selected hash functions submitted for the SHA-3 competition in the SDEx encryption method. The group of these functions will include the finalists of the SHA-3 competition, i.e. BLAKE, Grøstl, JH, Keccak, Skein. The aim of the analysis is to develop more secure and faster cryptographic algorithm compared to the current version of the SDEx method with SHA-512 and the AES algorithm. When considering the speed of algorithms, mainly the software implementation will be taken into account, as it is the most commonly used.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 1; 57--62
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Strategy for Automatic Elimination of Mechanical Instability in Structural Analysis of Spatial Truss Tower Model
Autorzy:
Pelc, J.
Powiązania:
https://bibliotekanauki.pl/articles/298108.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
kratownica
model przestrzenny
metoda elementów skończonych
lattice
transmission tower
spatial model
finite element method
Opis:
A method for structural analysis of lattice transmission towers considered to be spatial trusses is proposed. It consists in automatic elimination of mechanical instability from the structure. The instability result from the existence of the so-called out-of-plane nodes in a structure model. The method is based on blocking the possible displacements of out-of-plane nodes and the information concerning the need for blocking the specific displacement is obtained from analysis of the system stiffness matrix. Through application of the spatial rod finite elements lattice transmission towers may be analysed with the use of spatial truss models. The short characteristic of the in-house computer program applied for identification of truss members not satisfying the load capacity criterion, comparison of the results obtained by use of the method and ones obtained by applying the plane truss model and the frame model with the reduced member flexural stiffnesses are also presented.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2012, 15(2); 319-330
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
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