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Wyszukujesz frazę "Janda, M." wg kryterium: Autor


Wyświetlanie 1-11 z 11
Tytuł:
Optimizing of cooling in electric machines
Autorzy:
Janda, M.
Skalka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1373715.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
maszyna elektryczna
optymalizacja
Opis:
This paper deals with thermal optimization of electric machines. There are described the connections of finite element methods with optimizations algorithms. This connection is used for modifications of brushless motor construction. Solution of physical field model is realized by FEMM program which cooperate with optimizing program. Optimizing program was created in Java programming language. This program can be easily modified for various Finite Elements Methods solvers. Cooperation between optimizing program and FEMM is realized be LUA script. Four optimizing algorithms were chosen for using in program: Random find, Bees method, Hill climbing and Simulated annealing. Compare of these methods is in this paper. The part of this work is the complete thermal analysis of AC machine and modifications of cooling.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2009, 84; 87-89
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of 3D scanner for diagnostic of electrical machines design
Autorzy:
Janda, M.
Kuchynkova, H.
Powiązania:
https://bibliotekanauki.pl/articles/1373324.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
maszyna elektryczna
diagnostyka maszyn elektrycznych
skaner 3D
electric machine
diagnostic
3D scanner
Opis:
This paper deals with 3D scanning in power electrical engineering. Specifically, using a scanner company Z800 Z-Corporation. This scanner was used to diagnose the structure of the electric machine coil. After taking all necessary steps to create 3D models from scanned data the model was obtained. This model was compared with the model that was created in one of modern CAD systems. This model made for the primary model for the production of measured coil. The variations in the construction of a coil were identified. Subsequent analysis identified the causes of changes in dimensions.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2010, 87; 157-160
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On-Machine Measurement Systems for High-Precision Workpieces, Produced on Five-Axis Milling Machines
Autorzy:
Zeleny, J.
Janda, M.
Powiązania:
https://bibliotekanauki.pl/articles/971102.pdf
Data publikacji:
2008
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machining
accuracy
on-machine measuring
Opis:
The paper describes control systems for measuring of complex workpieces machined on numerically controlled machine tools. The area is called "on-machine measurement" (OMM) and means measuring of workpieces still placed in the working space of the NC machine immediately after the NC machining operation. Measuring is performed by a touch probe inserted into the machine spindle and the movements of the probe are programmed to touch the workpiece in pre-selected points of machined surface. This makes it possible to compare the measured points with corresponding points of the CAD model and thus evaluate deviations in the normal direction between the ideal and real surfaces. In the RCMT - Research Center of Manufacturing Technology in Prague, the research of on-machine measurement methods has been performed with the aim to apply this technology for measuring of very precise and complex workpieces, produced on five-axis milling machines. Different types of control systems for three-axis, five-axis and "three and two" axis on-machine measurements have been analysed, verified and tested. The task has been solved as a part of the HARDPRECISION European project with the aim to verify possibilities in replacing application of conventional coordinate measuring machines (CMM) by on-machine measurements methods even for very complex parts with hardly accessible measured surfaces.
Źródło:
Journal of Machine Engineering; 2008, 8, 1; 11-18
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of fan of induction motor in the Ansys Workbench
Autorzy:
Janda, M.
Makki, Z.
Deeb, R.
Powiązania:
https://bibliotekanauki.pl/articles/377573.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
induction motor
electrical machines
Ansys Workbench
fan of induction machine
Opis:
This paper deals with the optimization of cooling of electric machines using Ansys Workbench. In many areas of electrical machines are increasingly used optimization methods to achieve greater performance and improved efficiency of the individual parts of electrical machines. These methods are very often connecting to computer programs such as Ansys, in order to obtain the best results. The program Ansys Workbench is several optimization algorithms that can be connected to the analysis of any group of physical fields. This allows other programs without the need to achieve optimal results in the design of electrical machines. This article specifically addresses the application of these algorithms for the adaptation of design changes the fan induction motor. Optimization was used to size the fan blades to achieve the greatest possible pressure coolant. The main dimensions of this design are limited fan induction motor and therefore are not optimized. The article discussed the results of this optimization, and also summarizes the main advantages and disadvantages of using this procedure.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 141-147
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of methods for solving the heat transfer in electrical machines
Autorzy:
Makki, Z.
Janda, M.
Deeb, R.
Powiązania:
https://bibliotekanauki.pl/articles/377726.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electrical machines
heat transfer
ANSYS Workbench
Opis:
This paper describes the use of modern computational methods for the verification of mathematical equations, to determine the total heat flow transmitted across a certain surface. ANSYS WORKBENCH is choosen as the computational software for this purpose. Calculations are presented for four models. There is a surface, which the total heat flow is transmitted through is considered as: a simple flat plate, comprising with other flat plate, and thin-walled and thick-walled tube. For each case, the total heat flow is calculated using numerical methods and modem computer methods (ANSYS WORBENCH). Performed results of numerical methods are compared with the results of ANSYS software. The numerical methods are considered as a referent. The error of ANSYS calculations in comparison with the the numerical is calculated. The heat transfer by conduction is described for all presented models. Finally, the results of temperature distribution and heat flux distribution for each simulated case are presented.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 75; 25-31
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Induction machine pulsating torque analysis
Autorzy:
Skalka, M.
Janda, M.
Ondrušek, Č.
Powiązania:
https://bibliotekanauki.pl/articles/1372867.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
maszyna indukcyjna
maszyna elektryczna
induction machine
electric machine
Opis:
This article contains a pulsating torque calculation of 3-phase induction machine with power 1.1 kW from electromagnetic field. Whole analysis is done by finite element method in ANSYS. The torque is calculated via a circular path integral of the Maxwell stress tensor. The Maxwell stress tensor provides a convenient way of computing forces acting on bodies by evaluating a surface integral.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2010, 88; 165-168
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of rotor position on oversaturated areas size of induction machine magnetic circuit
Autorzy:
Skalka, M.
Janda, M.
Ondrušek, Č.
Powiązania:
https://bibliotekanauki.pl/articles/1373484.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
maszyna indukcyjna
obwód magnetyczny
Opis:
This article contains a solution of magnetic field distribution with oversaturated areas localization and description. The rotor position is important for the maximal magnetic circuit saturated identification and oversaturated areas size influence of magnetic circuit due to the variable magnetic reluctance of path. Influence of rotor position on saturated magnetic circuit is analyzed with step on twenty angular positions per rotor slot pitch. This analysis is done for 3-phase 1.1 kW induction machine by finite element method. This the time behavior of magnetic flux density is analyzed in air gap for different load conditions of machine. The paper contains also general postprocessor results juxtaposition.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2009, 84; 91-96
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The problem with flow in radial channels synchronous machine
Autorzy:
Makki, Z.
Janda, M.
Deeb, R.
Powiązania:
https://bibliotekanauki.pl/articles/377188.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
radial channels
synchronous machine
flow rate
Opis:
This paper describes the use of computational methods for solving the flow of the air-cooling in the large synchronous machines where it is used to cool the stator winding and stator radial channels which are located between the stator packet sheets. The overall process flow is mostly influenced by the size of air gap between stator and rotor, the shape of the radial channels, and by flow rates in machines. This paper mostly discusses about the influence flow rate of the cooling medium which has effects on the pressure distribution and flow rate in the radial channels. Cooling medium considered in this article an air and for and for calculation was chosen ANSYS CFX.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 75-82
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of 2D and 3D FEM analysis of the magnetic field in a PM servo motor
Autorzy:
Deeb, R.
Janda, M.
Makki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/377200.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
PM servo motor
PM machine
magnetic field
2D magnetic analysis
3D magnetic analysis
FEM
Opis:
Nowadays, the applications of the electrical machines with permanent magnets become very common, because of the outstanding properties of these devices in comparison with the induction machines. PM machines do not indicate electrical losses with the field excitation, which means increasing of their efficiency. This is a very important factor considering the urgent need of the energy conservation. Although, numerical methods for a field computation are time consuming, they provide accurate results without making any simplification of the geometry. The paper presents a comparison of 2D and 3D magnetic analysis of a PM servo motor. The analyzed servo motor is designed with a surface magnet rotor and produced by the VUES Brno company. The applied PM material is of rare earth type NdFeB. This material is characterized by a very high energy product. 2D model of this servo motor is created using AutoCAD program. The 2D magnetic analysis is computed using FEMM (finite element method magnetics). The 3D magnetic analysis is computed using a modem technique in the field of magnetic analysis of electrical machines. 3D model of the servo motor is generated using RMxprt program. The 3D magnetic analysis of the generated 3D model is computed using Maxwell 3D program. The program Maxwell 3D generates fine mesh automatically with a high accuracy. The distribution of the magnetic field inside the servo motor is computed for the case of the nominal current in both of 2D and 3D magnetic analysis. The distribution of the magnetic flux density according to the air gap length is presented too. The FEM (finite element method) is used for both 2D and 3D magnetic analysis of this servo motor.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 297-309
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of temperature and brewing time of nettle (Urtica dioica L.) infusions on vitamin C content
Autorzy:
Wolska, J.
Czop, M.
Jakubczyk, K.
Janda, K.
Powiązania:
https://bibliotekanauki.pl/articles/875119.pdf
Data publikacji:
2016
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
temperature
brewing time
nettle
Urtica dioica
leaf
stem
root
infusion
vitamin C content
Opis:
Background. Stinging nettle (Urtica dioica L.) can be found in temperate climate zones of Europe, Africa and America Nettle may be a source of nutritional ingredients, mineral salts, vitamins and antioxidants. Objective. The aim of the study was to determine the effect of temperature and brewing time Urtica dioica L. infusions from different parts of this plant on vitamin C (ascorbic acid) content. Material and methods. Infusions of nettle leaf, stem and root were prepared at room temperature, 50°C, 60°C, 70°C and 80°C for 10 minutes. Leaf infusions were also brewed for 5, 10, 15 and 20 minutes at initial water temperature of 60°C. The amount of vitamin C was determined by the spectrophotometric method. Results. The best temperature of brewing nettle infusions, in terms of vitamin C concentration, is between 50 °C and 60 °C as it is sufficient to extract the substance, yet not high enough to destroy it. Conclusions. The optimal time of brewing appeared to be 10 minutes as the prolonged exposure to high temperature appeared to be detrimental for ascorbic acid as well.
Wprowadzenie. Pokrzywa zwyczajna (Urtica dioica L.) występuje w strefie klimatu umiarkowanego Europy, Afryki i Ameryki. Może być źródłem składników odżywczych i mineralnych, witamin i antyoksydantów. Cel badań. Celem badań było określenie wpływu temperatury i czasu przygotowywania naparów z różnych części pokrzywy zwyczajnej na zawartość witaminy C (kwasu askorbinowego). Materiał i metody. Napary z liści, łodyg i kłączy były przygotowywane w temperaturze pokojowej, 50°C, 60°C, 70°C i 80°C przez 10 minut. Ponadto napary z liści były przygotowane w temperaturze 60°C przez 5, 10, 15 and 20 minut. Zawartość witaminy C określono spektrofotometrycznie. Wyniki. Optymalna temperatura przygotowywania naparów z pokrzywy, pod kątem uzyskania maksymalnej zawartości witaminy C, mieści się w przedziale od 50°C do 60°C. Jest wystarczająca do przejścia tego związku do naparu i jednocześnie nie jest na tyle wysoka, aby ją zdegradować. Wnioski. Optymalnym czasem przygotowywania naparów z pokrzywy celem uzyskania jak największego stężenia witaminy C jest czas 10 minut; przedłużanie tego czasu może prowadzić do degradacji kwasu askorbinowego i zmniejszonej jego zawartości w naparach.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2016, 67, 4
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physico-chemical characteristics of selected honeys of the West Pomeranian Province and the value of their pro-health
Charakterystyka fizykochemiczna wybranych miodów z województwa zachodniopomorskiego i ich wartość prozdrowotna
Autorzy:
Szczuko, M.
Krzemianowska, E.
Janda, K.
Wolska, J.
Jamiol-Milc, D.
Powiązania:
https://bibliotekanauki.pl/articles/82734.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Źródło:
Folia Pomeranae Universitatis Technologiae Stetinensis. Agricultura, Alimentaria, Piscaria et Zootechnica; 2016, 38, 2(326)
2081-1284
Pojawia się w:
Folia Pomeranae Universitatis Technologiae Stetinensis. Agricultura, Alimentaria, Piscaria et Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-11 z 11

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