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Wyświetlanie 1-15 z 21
Tytuł:
Thermal analytical winding size optimization for different conductor shapes
Autorzy:
Wojda, R. P.
Powiązania:
https://bibliotekanauki.pl/articles/140709.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Dowell’s equation
Eddy currents
FEM
inductors
optimization
proximity effect
skin effect
thermal effects
winding losses
Opis:
The aim of this paper is to derive an analytical equations for the temperature dependent optimum winding size of inductors conducting high frequency ac sinusoidal currents. Derived analytical equations are useful designing tool for research and development engineers because windings made of foil, square-wire, and solid-round-wire windings are considered. Temperature dependent Dowell’s equation for the ac-to-dc winding resistance ratio is given and approximated. Thermally dependent analytical equations for the optimum foil thickness, as well as valley thickness and diameter of the square-wire and solid-round-wire windings are derived from approximated thermally dependent ac-to-dc winding resistance ratios. Minimum winding ac resistance of the foil winding and local minimum of the winding ac resistance of the solid-round-wire winding are verified with Maxwell 3D Finite Element Method simulations.
Źródło:
Archives of Electrical Engineering; 2015, 64, 2; 197-214
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja parametrów napawania stali C45E drutem CastoMag 4554S z wykorzystaniem metody Taguchiego
Optimization of Parameters of Pad Welding steel C45E by Wire CastoMag 4554S using Taguchi Method
Autorzy:
Woźniak, P.
Starosta, R.
Powiązania:
https://bibliotekanauki.pl/articles/342005.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni
Tematy:
metoda Taguchiego
optymalizacja
parametry napawania
Taguchi method
optimization
pad welding parameters
Opis:
Artykuł jest wstępem do serii badań, pozwalających dobrać najlepsze parametry napawania metodą GMA stali C45E drutem CastoMag 4554S. Próbki stali zostały przygotowane oraz wstępnie podgrzane do temperatury 300°C. Plan eksperymentu opracowano na podstawie metody Taguchiego. Celem przeprowadzenia optymalizacji był dobór odpowiednich parametrów technologicznych i uzyskanie najmniejszego udziału materiału podłoża w napoinie. Do analizy wyników wykorzystano regresję wielokrotną oraz metodę Taguchiego.
The article is an introduction to a series of investigations that will allow to choose the best parameters of pad welding with GMA method of steel C45E by wire CastoMag 4554S. Steel samples were prepared and preheated to 300 degrees Celsius (C). The plan of experiment was developed on the basis of the Taguchi method. The purpose of the optimization was to select appropriate technological parameters and to obtain the smallest proportion of the substrate material in the padding weld. Analysis of the results was performed using multiple regression and Taguchi method.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Gdyni; 2017, 100; 187-199
1644-1818
2451-2486
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Gdyni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic fracturing optimization framework based on PKN and Cinco-Ley methods
Autorzy:
Budzowski, R.
Janiga, D.
Czarnota, R.
Wojnarowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/299213.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
optimization
hydraulic fracturing
nature - inspired optimization algorithms
Opis:
In an era of decreasing number of discoveries of conventional hydrocarbon reservoirs, in the global oil and gas industry we can observe growing interest in unconventional resources. Conducting effective production from this type of reservoirs is associated with carrying out the intensification processes of production, among which hydraulic fracturing is the most popular. Fracturing project design consist of several technological parameters, i.e. the type of fracturing fluid and quantity of proppant, which have a direct impact on the process effectiveness. The actual shape of the fracture is difficult to predict due to the local heterogeneity of the reservoir and the superposition of the phenomena occurring during stimulation treatment. In this paper optimization model was proposed, which allows for selection appropriate parameters of fracturing technology. Developed optimization algorithm is based on two-dimensional PKN fracture model and Cinco-Ley analytical method. Optimization method used in this paper based on nature - inspired algorithms which were compared with gradient method.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 1; 157-167
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the position of the local distribution centre of the regional post logistics network
Autorzy:
Droździel, P.
Wińska, A.
Madleňák, R.
Szumski, P.
Powiązania:
https://bibliotekanauki.pl/articles/375506.pdf
Data publikacji:
2017
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
vehicle routing problem
postal network
optimization
p-median problem
sieć pocztowa
optymalizacja
Opis:
The phenomenon of the present postal services is the fact that, customers expect the lowest price while maintaining the availability, security and on time delivery of mail items. We can find that, the costs associated with transport of the postal substrate is one of the most important factors affecting the total cost of the postal services. These transport costs depend on various factors such as the investment in vehicles purchase, operational costs of the postal vehicles (costs of maintenance, repairs, fuel costs of the vehicle, etc.) labour costs of the drivers and so on. For this reason, it is important to find such an operational - organizational solutions that can reduce the costs associated with the transportation of postal shipments, resulting in reducing the total cost of postal services. One option to do this is to minimize the length of postal transportation routes. This article presents the approach based on the application of graph theory to optimize existing connections of postal logistics network. Published results is oriented to revaluate existing position of local centre and find a location for the new local distribution centre potentially. New location of local distribution centre can to optimize (minimize) the total transport costs of the local postal transportation network in area of the Lublin Province.
Źródło:
Transport Problems; 2017, 12, 3; 43-50
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Control of a Wind Farm Group Using the WindEx System
Optymalne sterowanie grupy farm wiatrowych w oparciu o system WindEx
Autorzy:
Kocejko, P.
Wydra, M.
Jędrychowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/397523.pdf
Data publikacji:
2014
Wydawca:
ENERGA
Tematy:
state estimation
optimization
SCADA
estymacja stanu
optymalizacja
Opis:
The aim of this paper is to present achievements obtained in implementing the framework project N R01 0021 06 in the Power System Department of Lublin University of Technology. The result of the work was “A system of optimal wind farm power control in the conditions of limited transmission capabilities of power networks”, which one of two main modules is a state estimator. The featured wind farm control system was integrated with a SCADA dispatcher system WindEx using the WebSVC service.
W artykule autorzy przedstawili układ optymalnej regulacji farm wiatrowych, który zintegrowano z systemem dyspozytorskim WindEx poprzez usługę WebSVC. Celem publikacji jest przedstawienie efektu prac projektu badawczo-rozwojowego N R01 0012 06 w Katedrze Sieci Elektrycznych i Zabezpieczeń Politechniki Lubelskiej. W ich wyniku powstał układ optymalnej regulacji mocy farm wiatrowych w warunkach ograniczonych możliwości przesyłowych sieci elektroenergetycznych, którego najważniejsze moduły obliczeniowe stanowią estymator stanu i optymalizator, współpracujące z systemem SCADA.
Źródło:
Acta Energetica; 2014, 3; 66-78
2300-3022
Pojawia się w:
Acta Energetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalne sterowanie grupą farm wiatrowych w oparciu o system windex i zewnętrzne moduły obliczeniowe
Optimal control of a wind farm group using the windex system and external computing modules
Autorzy:
Kacejko, P.
Wydra, M.
Jędrychowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/267534.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
estymacja stanu
optymalizacja
SCADA
state estimation
optimization
Opis:
W artykule przedstawiono układ optymalnej regulacji farm wiatrowych, który zintegrowano z systemem dyspozytorskim WindEx poprzez usługę WebSVC. W wyniku prac powstał „Układ optymalnej regulacji mocy farm wiatrowych w warunkach ograniczonych możliwości przesyłowych sieci elektroenergetycznych”, którego najważniejsze moduły obliczeniowe stanowią estymator stanu i optymalizator współpracujące z lokalnym systemem SCADA.
The aim of this paper is to present a “A system of optimal wind farm power control in the conditions of limited transmission capabilities of power networks”, which one of two main modules is an state estimator. Featured wind farm control system was integrated with SCADA dispatcher system WindEx using WebSVC service.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2013, 33; 75-78
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of channel access in wireless sensor networks
Autorzy:
Holecko, P.
Pirnik, R.
Bubenikova, E.
Powiązania:
https://bibliotekanauki.pl/articles/393455.pdf
Data publikacji:
2012
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
TDMA
optymalizacja
bezprzewodowe sieci sensorowe
optimization
wireless sensor networks
Opis:
The objective of the work presented in this paper is to analyse the problem of deployment of TDMA wireless sensor networks in the area of transport telematics from the communication subsystem optimization perspective. The problem of broadcast scheduling has been outlined and a heuristic algorithm has been designed for the optimization of radio channel access control using the TDMA method. The channel utilization was the main optimization goal while eliminating primary and secondary conflicts between the broadcasting stations.
Źródło:
Archives of Transport System Telematics; 2012, 5, 3; 31-34
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of mechanical alloying process on structural, mechanical and tribological behaviours of CNT reinforced aluminium composites – a statistical analysis
Autorzy:
Manikandan, P.
Elayaperumal, A.
Franklin Issac, R.
Powiązania:
https://bibliotekanauki.pl/articles/2173611.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder metallurgy
composites
morphology
optimization
wear
metalurgia proszków
kompozyt
morfologia
optymalizacja
Opis:
The mechanical and tribological properties of the Al/CNT composites could be controlled and improved by the method of its fabrication process. This research article deals with the optimization of mechanical and tribological properties of Al/CNT composites, which are fabricated using the mechanical alloying process with the different weight percentage of multi-walled CNT reinforcement. The phase change and the presence of CNT are identified using the X-Ray Diffraction (XRD) analysis. The influence of mechanical alloying process and the multi-walled CNT reinforcement on the mechanical, and tribological behaviours of the Al/CNT composites are studied. The optimal mechanical alloying process parameters and the weight percentage of multi-walled CNT reinforcement for the Al/CNT composite are identified using the Response Surface Methodology (RSM), which exhibits the better hardness, compressive strength, wear rate and Coefficient of Friction (CoF). The Al/CNT composite with 1.1 wt.% of CNT has achieved the optimal responses at the milling speed 301 rpm and milling time 492 minutes with the ball to powder weight ratio 9.7:1, which is 98% equal to the experimental result. This research also reveals that the adhesive wear is the dominant wear mechanism for the Al/CNT composite against EN31 stainless steel but the optimal Al/CNT composite with 1.1 wt.% of multi-walled CNT has experienced a mild abrasive wear.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136745
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transformer performance enhancement by optimized charging strategy for electric vehicles
Autorzy:
Venkataswamy, R.
Uma Rao, K.
Meena, P.
Powiązania:
https://bibliotekanauki.pl/articles/2042802.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
charging stations
electric vehicle
e-mobility
optimization
transformer efficiency
transformer regulation
Opis:
Transformer efficiency and regulation, are to be maintained at maximum and minimum respectively by optimal loading, control, and compensation. Charging of electric vehicles at random charging stations will result in uncertain loading on the distribution transformer. The efficiency reduces and regulation increases as a consequence of this loading. In this work, a novel optimization strategy is proposed to map electric vehicles to a charging station, that is optimal with respect to the physical distance, traveling time, charging cost, the effect on transformer efficiency and regulation. Consumer and utility factors are considered for mapping electric vehicles to charging stations. An Internet of Things platform is used to fetch the dynamic location of electric vehicles. The dynamic locations are fed to a binary optimization problem to find an optimal routing table that maps electric vehicles to a charging station. A comparative study is carried out, with and without optimization, to validate the proposed methodology.
Źródło:
Archives of Electrical Engineering; 2022, 71, 1; 37-56
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of mechanical alloying process on structural, mechanical and tribological behaviours of CNT reinforced aluminium composites – a statistical analysis
Autorzy:
Manikandan, P.
Elayaperumal, A.
Franklin Issac, R.
Powiązania:
https://bibliotekanauki.pl/articles/2128149.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder metallurgy
composites
morphology
optimization
wear
metalurgia proszków
kompozyt
morfologia
optymalizacja
Opis:
The mechanical and tribological properties of the Al/CNT composites could be controlled and improved by the method of its fabrication process. This research article deals with the optimization of mechanical and tribological properties of Al/CNT composites, which are fabricated using the mechanical alloying process with the different weight percentage of multi-walled CNT reinforcement. The phase change and the presence of CNT are identified using the X-Ray Diffraction (XRD) analysis. The influence of mechanical alloying process and the multi-walled CNT reinforcement on the mechanical, and tribological behaviours of the Al/CNT composites are studied. The optimal mechanical alloying process parameters and the weight percentage of multi-walled CNT reinforcement for the Al/CNT composite are identified using the Response Surface Methodology (RSM), which exhibits the better hardness, compressive strength, wear rate and Coefficient of Friction (CoF). The Al/CNT composite with 1.1 wt.% of CNT has achieved the optimal responses at the milling speed 301 rpm and milling time 492 minutes with the ball to powder weight ratio 9.7:1, which is 98% equal to the experimental result. This research also reveals that the adhesive wear is the dominant wear mechanism for the Al/CNT composite against EN31 stainless steel but the optimal Al/CNT composite with 1.1 wt.% of multi-walled CNT has experienced a mild abrasive wear.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136745, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency improvement of switched reluctance generator using optimization techniques
Autorzy:
Reis, M. R. C.
Araújo, W. R. H.
Calixto, W. P.
Powiązania:
https://bibliotekanauki.pl/articles/136169.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
switched reluctance generator
optimization
control
genetic algorithm
Opis:
This article introduces the switched reluctance machine operating as a generator. This kind of electrical machine delivers CC power at the output and the energy generated can be controlled through several variables. In this work, the switching angles of the machine's power converter are optimized using deterministic and heuristic techniques so that the output power is kept constant via PI controller while guaranteeing maximum value for machine performance, even for different excitation values and mechanical power on the shaft.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 1; 74-80
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of process parameters of friction stir welded AA 5083-O aluminum alloy using Response Surface Methodology
Autorzy:
Jannet, S.
Mathews, P. K.
Raja, R.
Powiązania:
https://bibliotekanauki.pl/articles/202208.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir welding
optimization
Response Surface Analysis
Analysis of Variance
tensile strength
spawanie
tarcie
optymalizacja
RSA
wytrzymałość na rozciąganie
Opis:
A methodology was exhibited to create the experimental model for assessing the Ultimate Tensile Strength of AA 5083-O aluminum compound which is broadly utilized as a part of boat building industry by Friction Stir Welding (FSW). FSW process parameters, such as: tool rotational speed, welding speed, and axial force were optimized for better results. FSW was completed considering three-component 3-level Box Behnekn Design. Response surface Methodology (RSM) was implemented to obtain the relationship between the FSW process parameters and ultimate Tensile Strength. Analysis of Variance (ANOVA) procedure was utilized to check the aptness of the created model. The FSW process parameters were additionally streamlined utilizing Response Surface Methodology (RSM) to augment tensile strength. The joint welded at a rotational speed of 1100 rpm, a welding speed of 75 mm/min and a pivotal energy of 2.5 t displays higher tensile strength compared with different joints in comparison with other joints.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 851-855
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient torsional analysis of a belt conveyor drive with pneumatic flexible shaft coupling
Autorzy:
Kaššay, P.
Homišin, J.
Urbanský, M.
Grega, R.
Powiązania:
https://bibliotekanauki.pl/articles/386779.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
transient torsional vibration
optimization
torsional analysis
belt conveyor
pneumatic flexible shaft coupling
Opis:
Development and application of pneumatic flexible shaft couplings have been in the center of our department research activities for a long time. These couplings are able to change torsional stiffness by changing pressure in their flexible elements – air bel-lows. Until now we have dealt with the use of pneumatic flexible shaft couplings for tuning mechanical systems working with periodically alternating load torque at steady state. Some mechanical systems, however, operate with a static load torque at constant speed (e.g. hoists, elevators, etc.), where it is necessary to consider the suitability of shaft coupling in terms of load torque at transient conditions (run-up and braking). Therefore we decided to analyze the use of pneumatic flexible shaft couplings also in this type of mechanical systems on an example of conveyor belt drive.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 1; 69-72
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of well placement and control to maximize CO2 trapping during geologic sequestration
Autorzy:
Stopa, J.
Janiga, D.
Wojnarowski, P.
Czarnota, R.
Powiązania:
https://bibliotekanauki.pl/articles/298725.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
CO2 sequestration
optimization
numerical simulation
Opis:
The CO2 injection into geological formations such as saline aquifers can be effective method of sequestration enabling efficient immobilization of gas by surface and capillary forces. The main objective of presented method of optimization was to determine optimal well position and injection rates that maximize residual trapping. This would mitigate the risk of the CO2 leakage outside of storage zone. A genetic algorithm and particle swarm optimization have been developed and coupled with reservoir simulator to optimally examine various placement and injection control strategies for vertical as well as horizontal well. Optimization was carried out in 3D heterogeneous real field model with water-CO2 -formation rock relationship. Numerical examples confirm that developed algorithm can find a promising optimal solution effectively within a partial number of simulation runs.
Źródło:
AGH Drilling, Oil, Gas; 2016, 33, 1; 93-104
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The simulation experiment as a means of the transport systems optimization
Eksperyment symulacyjny jako instrument optymalizacji systemów transportowych
Autorzy:
Makarova, I.
Khabibullin, R.
Belyaev, A.
Buyvol, P.
Powiązania:
https://bibliotekanauki.pl/articles/374779.pdf
Data publikacji:
2010
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
eksperyment symulacyjny
system transportowy
optymalizacja
simulation experiment
transport system
optimization
Opis:
In the article the matters connected with the firm service system optimization using the simulation experiment are shown. It is analyse in short by the results of computer experiment execution, and useful guidelines are given.
W artykule przedstawione zostały zagadnienia związane z możliwością wykorzystania eksperymentów symulacyjnych do optymizacji systemów transportowych na przykładzie przedsiębiorstwa usługowego. Analizie zostały poddane wyniki eksperymentów symulacyjnych, które posłużyły do sformułowania wniosków.
Źródło:
Transport Problems; 2010, 5, 3; 43-48
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
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