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Tytuł:
Additional losses by magnetic field harmonics in the rotor bars of asynchronous machines and their influence
Autorzy:
Schuffenhauer, U.
Kuß, H.
Powiązania:
https://bibliotekanauki.pl/articles/262829.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
induction motors
losses
additional losses
finite element method
Opis:
Optimizing the efficiency of modern asynchronous machines requires the knowledge of the particular loss components. In this contribution a method shall be presented, where by the transient FEM-calculation the copper losses in the rotor bars by harmonic field effects and the consequential originating harmonic currents can be estimated. By this way the determination of the current density of the rotor current harmonics is carried out along the height of the rotor bar. The loss distribution from the bar bottom to the bar tip is derived from the effective current density and its spatial distribution. The calculation shows, that the additional losses represent a considerable quantum of the total losses, they are partly in the range of the fundamental copper losses and therewith they have a lasting effect on the efficiency of the machine. By convenient geometrical actions a reduction of the additional losses is possible.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 117-120
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of coefficients of energy losses occurring in a constant capacity pump working in a typical hydrostatic drive
Autorzy:
Skorek, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/245612.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
coefficients of losses
energy losses
hydrostatic system
axial piston pump
Opis:
In order to assess possibilities of energy saving during hydrostatic drive system operation, should be learned, and described losses occurring in system. Awareness of proportion of energy, volume, pressure, and mechanical losses in elements is essential for improving functionality and quality of hydrostatic drive systems characterized by unquestionable advantages. In systems with too low efficiency there is increase of load, mainly in case of pump load, which can lead to higher risk of failure, necessity of repair or replacement, as well as to shorten service life of system. Coefficients ki, given in subject literature by Paszota, describe relative value of individual losses in element. They make it possible to assess proportions of losses and assess value of energy efficiency (volumetric, pressure, mechanical) resulting from losses occurring at nominal pressure pn of system in which element is used. As a result, thanks to knowledge of coefficients ki of individual losses, it is possible to determine losses and energy efficiency of components operating in hydraulic system as well as efficiency of system with defined structure of motor speed control as function of speed and load coefficient of motor. Knowledge of coefficients of energy losses occurring in system elements (pump, hydraulic motor, conduits, and motor) allows building models of losses and energy efficiency of element working in system and energy efficiency of system as whole composed of elements. Mathematical models of losses and energy efficiency in system must take into account conditions resulting from applied structure of system, from level of nominal pressure, from rotational speed of motor driving pump shaft, from viscosity change of applied hydraulic oil. Article presents method of determining coefficients of axial piston pump used in typical hydrostatic drive system with proportional control. Values that can be assumed for these loss coefficients for other hydraulic pumps are also given.
Źródło:
Journal of KONES; 2019, 26, 1; 159-166
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Erozyjne straty fosforu w doświadczeniu modelowym
The phosphorus losses in erosion processes in modeling experiment
Autorzy:
Jadczyszyn, J.
Mroczkowski, W.
Gosek, S
Powiązania:
https://bibliotekanauki.pl/articles/296939.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
spływ powierzchniowy
zmyw gleby
straty fosforu
straty próchnicy
runoff
soil losses
phosphorus losses
soil organic losses
Opis:
Straty fosforu analizowano na podstawie wyników badań modelowych przeprowadzonych w warunkach deszczu naturalnego na Stacji Doświadczalnej w Puławach w latach 1999-2001. Badania wykonano na mikropoletkach o wymiarach 2 m x 1 m x 0,3 m i nachyleniu 10%, wypełnionych materiałem glebowym z poziomu orno-próchnicznego. Pod względem genetycznym przeanalizowano siedem typów gleb, a pod względem składu granulometrycznego - 10 gatunków gleb. Glebę w mikropoletkach w sezonie wegetacyjnym utrzymywano w czarnym ugorze. W okresie trzech lat w materiale glebowym wymytym z mikropoletek (zawiesinie glebowej) analizowano zawartość próchnicy i fosforu oraz stężenie formy rozpuszczonej fosforu w wodzie spływu powierzchniowego. W celu określenia bezpośredniego wpływu nawożenia fosforowego na stężenie fosforu w wodzie spływu powierzchniowego oraz jego zawartości w wymytym materiale glebowym wiosną trzeciego roku doświadczenia zastosowano nawożenie gleby superfosfatem. Badania spływu oraz strat fosforu i próchnicy glebowej prowadzono oddzielnie dla każdego deszczu erozyjnego. Wyniki badań wykazały wyraźny wzrost stężenia fosforu w wodach spływu i jego sumaryczne ilościowe wymycie z mikropoletek, na których zastosowano nawożenie fosforem. W wymytym materiale glebowym stwierdzono ponad 2-krotny wzrost próchnicy w stosunku do jej zawartości w mikropoletku.
The losses of phosphorus were analyzed based on the results of model tests carried out under natural rain conditions at the Experimental Station in Pulawy in the years of 1999-2001. The study was performed in microplot experiments with the dimensions of 2 m x 1 m x 0.3 m and a slope of 10% filled with soil material from the top - humus layer. In terms of genetic analyses, seven types of soils, and in terms of the texture 10 of the soil groups were analyzed. The soil in microplots was maintained in black fallow. The loss of phosphorus and humus content in the washed soil and in the water runoff was analyzed within three years of the experiments. In the spring of the third year of the experiment, phosphorous fertilization was used in order to determine the direct effect of phosphorus fertilization with superphosphate on the phosphorus concentration in water runoff and its content in the washed out soil material. The study of runoff and phosphorus losses and humus content were conducted separately for each erosion rain. The results showed a clear increase in the concentration of phosphorus in the runoff and washed soil where phosphorus fertilization was applied. There was also a twofold increase in the humus content in the washed out soil material compared to the soil in microplots.
Źródło:
Inżynieria i Ochrona Środowiska; 2014, 17, 1; 89-103
1505-3695
2391-7253
Pojawia się w:
Inżynieria i Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient approach for iron loss separation of non-grain-oriented electrical steels considering the impact of cut edge effect
Autorzy:
Mülder, Christoph
Elfgen, Silas
Hameyer, Kay
Powiązania:
https://bibliotekanauki.pl/articles/140851.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cut edge effect
hysteresis losses
iron losses
transient loss model
Opis:
The purpose of this paper is to focus on the loss separation of non-grain-oriented electrical steels used for speed-variable rotating electrical machines. The impact of laser-cutting, used in prototype manufacturing and of flux density harmonics, occurring locally in the lamination, on the loss distribution is studied in detail. Iron losses occurring under operation can physically be separated in different loss components. In this paper, a frequency-based loss model with parameters identified for single-sheet tester specimens, cut in strips of different widths, is therefore used. Moreover, a time-domain approach considers loss distributions occurring from higher harmonics. Hysteresis losses having high sensitivity to cut edge effects are calculated by the well-known Jiles-Atherton model adapting the frequency-based loss parameters. The model is validated by free-curve measurements at a single-sheet tester. It has been shown that the studied elliptical hysteresis model becomes inaccurate particularly for specimens with small strip widths with similar dimensions as teeth of electrical machine laminations. The incorrect mapping of losses occurring from minor hysteresis loops due to higher harmonics is concluded. The results showconsequently that both, the impact of a cut edge effect and local distributions of flux density harmonics need to be considered in terms of accurate iron loss prediction of electrical machine design.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 237-244
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of end-winding proximity losses in a high-speed PM machine
Autorzy:
Mlot, A.
Lukaniszyn, M.
Korkosz, M.
Powiązania:
https://bibliotekanauki.pl/articles/141443.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
end-winding
permanent magnet motor
eddy-currents losses
proximity losses
Opis:
This paper presents a finite element investigation into the proximity losses in a high-speed permanent magnet (PM) machine for traction applications. A three-dimensional (3D) finite element analysis (FEA) is employed to evaluate and identify the endwinding contribution into the overall winding power loss generated. The study is focused on the end-winding effects that have not been widely reported in the literature. The calculated results confirm that the end-winding copper loss can significantly affect the eddycurrent loss within copper and it should be taken into account to provide reasonable prediction of total losses. Several structures of the end-winding are analyzed and compared in respect to the loss and AC resistance. The results clearly demonstrate that the size of the end-winding has a significant impact on the power loss. The calculated results are validated experimentally on the high-speed permanent magnet synchronous machine (PMSM) prototype for selected various winding arrangements.
Źródło:
Archives of Electrical Engineering; 2016, 65, 2; 249-261
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The opportunities for getting energy savings in the hydrostatic drive system
Autorzy:
Skorek, G.
Powiązania:
https://bibliotekanauki.pl/articles/246878.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
energy efficiency
energy losses
power
power of losses
hydrostatic system
control structures
Opis:
Full picture of the energy losses in a hydrostatic drive system is a picture of the power of energy losses in the system elements. Paper presents the areas of the power fields of energy losses occurring in the elements of some hydraulic systems with different structures of the hydraulic motor speed control. Proposed graphical interpretation allows analysing and comparing different hydrostatic drive systems. In many constructed and manufactured machines currently used hydrostatic drive systems or electro hydrostatic systems of varying complexity. Today, the need for energy-efficient systems forces to some extent the development and improvement of computational methods using computer aided relating to energy efficiency systems. Hydrostatic systems especially in modern machines play a very important role. Actuators, such as hydraulic motors, hydraulic cylinders is commonly used for a long time, including on machines and equipment land and marine. Unawareness of proportions of the energy, volumetric, pressure and mechanical losses in elements is often the case. Problems connected with energy efficiency are essential for improvement of functionality and quality of hydrostatic drive systems, characterised by unquestioned advantages. Energy efficiency of hydrostatic transmissions, particularly those with throttling control of the motor speed, and also efficiency of the hydraulic servomechanism systems may be in fact higher than the values most often quoted in publications on the subject.
Źródło:
Journal of KONES; 2014, 21, 2; 273-280
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of microgeometry bearing surface of the piston on the parameters of oil film
Autorzy:
Wróblewski, E.
Iskra, A.
Babiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/242986.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
piston
friction losses
Opis:
The formation of oil film is possible under certain parameters of microgeometry cooperating components the main node of the internal combustion engine, which is a piston-pin-piston rings. In addition, this node is primarily responsible for the formation of mechanical losses. It is advisable to reduce friction losses in the piston-cylinder group lead to an increase in the overall efficiency of the engine and thus reduce the fuel consumption. One way of achieving these objectives is modification of microgeometry of the piston-bearing surface, which cooperates with the cylinder wall. The geometry of the gap between the piston skirt and the cylinder liner greatly affects the friction loss inside the engine. This means that the friction loss is much more affected by the area covered by the oil film separating the mating elements than its thickness. The method to reduce the area covered by the oil film is a modification of the bearing surface of the piston by adjusting the profile. The supporting surface, which performs a reciprocating motion relative to the strokes of the cylinder liner ensure the continuity of the oil film with the smallest possible value of the friction losses at the node piston-cylinder. This paper presents the results of simulation leading which aim to determining the parameters oil film on the friction loss for the modified bearing surface of the piston.
Źródło:
Journal of KONES; 2016, 23, 2; 431-436
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uwagi Małopolskiego Wojewódzkiego Konserwatora Zabytków o stratach powodziowych w województwie małopolskim w 2010 r.
Comments of the Voivodeship Monument Conservator concerning damage caused by flooding in Lesser Poland in 2010
Autorzy:
Janczykowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/217647.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Konserwatorów Zabytków
Tematy:
straty powodziowe
Małopolska
flood losses
Opis:
Niniejszy artykuł jest relacją wojewódzkiego konserwatora zabytków o stratach, jakie poczyniły wiosenne powodzie w obszarze Małopolski. Omówione zostały zniszczenia m.in. drewnianych kościołów w Binarowej oraz Łapanowie, pałacu w Siarach koło Gorlic. Uszkodzeniu uległy także dwa kopce: Piłsudzkiego i Kościuszki w Krakowie. W podsumowaniu autor zgłosił pilną potrzebę znalezienia optymalnego sposobu zabezpieczania zabytków przed falą powodziową.
This article is the report of the Voivodeship Monument Conservator concerning the damage caused by the spring flooding in the area of Lesser Poland. The report presents damage done to the e.g. wooden churches in Binarowa and Łapanow, the palace in Siary near Gorlice. Two mounds: of Piłsudski and Kościuszko in Krakow were also damaged. In conclusion the author emphasised the urgent need to find an optimal method of protecting historical objects from flooding.
Źródło:
Wiadomości Konserwatorskie; 2010, 28; 121-123
0860-2395
2544-8870
Pojawia się w:
Wiadomości Konserwatorskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Causes of Ships Groundings in Terms of Integrated Navigation Model
Autorzy:
Jurdziński, M.
Powiązania:
https://bibliotekanauki.pl/articles/320709.pdf
Data publikacji:
2017
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
ship grounding
losses of vessels
Opis:
The paper presents an influence of the navigational model change on the structural and qualitative changes of the ships groundings in international shipping. Data was analyzed based on reports of 75 seagoing vessels in international shipping in the 2000–2014. This study is an attempt to assess the causes of ships groundings in the new integrated navigation model.
W artykule przedstawiono wpływ zmiany modelu nawigacyjnego na zmiany strukturalne i jakościowe powstawania awarii wejścia statków na mielizny w żegludze międzynarodowej. Opracowano dane na podstawie raportów wejść na mieliznę 75 statków morskich w żegludze międzynarodowej w latach 2000–2014. Niniejsza praca stanowi próbę oceny przyczyn powstawania awarii wejścia statku na mieliznę w nowym modelu zintegrowanej nawigacji morskiej.
Źródło:
Annual of Navigation; 2017, 24; 119-135
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometric shape of the support surface of the piston
Autorzy:
Iskra, A.
Babiak, M.
Wróblewski, E.
Powiązania:
https://bibliotekanauki.pl/articles/243151.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
piston
friction losses
Opis:
Geometry of the slot between piston bearing surface and cylinder bore affects the friction losses of the IC engine to the far extent. It appears that these losses depend more on the area covered with oil than the thickness of oil layer separating collaborating parts. Barrel-shaped or stepwise piston bearing surface is the way to reduce the oil-covered area. The first concept has been used for years while the stepwise profile has not been applied for various reasons, although this idea providing higher load capacity of oil layer in stepwise slot was published in literature in the fifties of twentieth century. The stepwise profile can be obtained covering the cylindrical or tapered piston-bearing surface with a thin layer graphite. This paper presents the results of simulation leading to the reduction in friction losses and abrasive wear of piston bearing surface and cylinder bore. Covering the piston bearing surface with a thin layer of graphite one can get an extremely advantageous tribological properties of the piston assembly which means the expected parameters of oil film and in a case of film rupture – an ignorable abrasive wear of the graphite layer and/or cylinder bore.
Źródło:
Journal of KONES; 2015, 22, 4; 95-101
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation method and mathematical model of pressure losses in hydraulic rotary motor
Autorzy:
Maczyszyn, A.
Powiązania:
https://bibliotekanauki.pl/articles/259344.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive
power values of energy losses
hydraulic rotary motor
pressure losses
pressure efficiency
Opis:
This paper presents a way of determining the coefficient k8 of the pressure losses ΔpMp (flow drag) in internal ducts of SWSB-63 hydraulic motor. The coefficient is determined at a flow rate equal to the theoretical capacity QPt of the pump feeding the motor , the losses are related to the nominal pressure pn in the hydraulic system. The investigations followed a model of energy performance of hydraulic rotary motor, proposed by Z. Paszota.
Źródło:
Polish Maritime Research; 2018, 1; 93-98
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of hydraulic oil viscosity on the volumetric losses in a variable capacity piston pump
Autorzy:
Koralewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/260594.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydrostatic drive
displacement pumps
estimation of energy losses
impact of oil viscosity on losses
Opis:
The variable capacity piston pumps are elements of the great power and highest energy efficiency hydrostatic drives. They are used in the drive systems of ship equipment such as deck cranes, steering gears, main propulsion of smaller vessels. The laboratory and simulation investigations of the influence of liquid viscosity on the variable capacity displacement pump energy losses have not been so far performed. The paper presents results of the investigations of impact the hydraulic oil viscosity has on the volumetric losses in a piston pump operating in the full range of its capacity and oil pressure.
Źródło:
Polish Maritime Research; 2011, 3; 55-65
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected technical aspects of managing efficient heat supply in a district heating system
Autorzy:
Wrzalik, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/29521087.pdf
Data publikacji:
2023
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
district heating
heat transmission
district heating main
flow velocity
heat losses
pressure losses
efficiency
Opis:
District heating networks are key components of efficient heat supply systems for municipal and industrial consumers. The purpose of the research presented in this article was to analyze the thermo-hydraulic parameters of the operation of a transmission main in a district heating network to improve the heat transfer efficiency. Based on a literature review of existing studies, the basic issues of the heat supply process were discussed, and selected methods and tools for simulating district heating networks were characterized. A detailed mathematical description of the phenomena occurring during heat transport in a district heating network pipeline was also presented. Then, analytical calculations and simulations were carried out for the selected district heating system using Termis software. Operational parameters collected in the actual district heating system were used as output data for analytical modeling. Pressure drops, power losses, and heat transfer efficiencies in the main buses at different outdoor temperatures during the heating season were determined. Selected results of the study were included, and possibilities for improving the efficiency of heat transfer in the studied district heating network were indicated.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 76 (148); 32-41
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of mechanical losses of single-cylinder spark-ignited engine
Autorzy:
Romero, Carlos A.
Henao, Edison
Ramírez, Juan
Powiązania:
https://bibliotekanauki.pl/articles/1840848.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
internal combustion engines
friction losses
pumping losses
mechanical efficiency
silnik spalinowy
straty tarcia
sprawność mechaniczna
Opis:
In this study, the mechanical losses of a single-cylinder spark-ignited Robin EY15 engine were experimentally determined and analysed by the indicated method. The effects of the load and speed on the mechanical loss balance were also analysed. The tests were conducted on a test bench equipped with a DC motor generator at speeds between 1500 and 4800 min-1 and three load levels of 25, 50, and 100%. The results showed that the mechanical efficiency ranges between 22.5% and 83.2% for the tested engine and the evaluated operation points, attaining the highest efficiency under the full load and 2100 min-1. However, at this load level, the efficiency is reduced to 29% with the increase in the rotation speed. Concurrently, the pumping losses contribute up to 58.7% of the total losses, which indicates that their contribution is even higher than the sum of the other components under low load conditions. However, as the load increases, this contribution decreases to 18% for lower rotation regimes. In addition, the experimental results of the total mechanical losses were compared with some numerical correlations found in the literature. Finally, some empirical correlations were proposed for the mechanical efficiency calculation of the tested engine.
Źródło:
Diagnostyka; 2021, 22, 3; 13-24
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of mechanical losses of single-cylinder spark-ignited engine
Autorzy:
Romero, Carlos A.
Henao, Edison
Ramírez, Juan
Powiązania:
https://bibliotekanauki.pl/articles/1840879.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
internal combustion engines
friction losses
pumping losses
mechanical efficiency
silnik spalinowy
straty tarcia
sprawność mechaniczna
Opis:
In this study, the mechanical losses of a single-cylinder spark-ignited Robin EY15 engine were experimentally determined and analysed by the indicated method. The effects of the load and speed on the mechanical loss balance were also analysed. The tests were conducted on a test bench equipped with a DC motor generator at speeds between 1500 and 4800 min-1 and three load levels of 25, 50, and 100%. The results showed that the mechanical efficiency ranges between 22.5% and 83.2% for the tested engine and the evaluated operation points, attaining the highest efficiency under the full load and 2100 min-1. However, at this load level, the efficiency is reduced to 29% with the increase in the rotation speed. Concurrently, the pumping losses contribute up to 58.7% of the total losses, which indicates that their contribution is even higher than the sum of the other components under low load conditions. However, as the load increases, this contribution decreases to 18% for lower rotation regimes. In addition, the experimental results of the total mechanical losses were compared with some numerical correlations found in the literature. Finally, some empirical correlations were proposed for the mechanical efficiency calculation of the tested engine.
Źródło:
Diagnostyka; 2021, 22, 3; 13-24
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 499

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