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Wyświetlanie 1-15 z 76
Tytuł:
Przekładnia magnetyczna prędkości obrotowej
Rotational speed magnetic gear
Autorzy:
Bernatt, Jakub
Gawron, Stanisław
Glinka, Tadeusz
Król, Emil
Powiązania:
https://bibliotekanauki.pl/articles/2056355.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
przekładnia mechaniczna
magnesy trwałe
rewersja obrotów
hamowanie
mechanical transmission
permanent magnets
reverse rotation
braking
Opis:
Przekładnia magnetyczna, przedstawiona w artykule, składa się z wirnika zewnętrznego, wirnika wewnętrznego i nieruchomego pierścienia umieszczonego między tymi wirnikami. Na jarzmach, od strony pierścienia magnetycznego są przymocowane magnesy trwałe. Wirnik zewnętrzny jest wolnoobrotowy (n1) o liczbie par biegunów p1. Wirnik wewnętrzny jest szybkoobrotowy (n2 ) o liczbie par biegunów p2. Stosunek prędkości obrotowej wirników wynosi [wzór] . Pierścień zarówno od strony zewnętrznej jak i wewnętrznej ma żłobki. Uzwojenie jest umieszczone w żłobkach. Przekładnia ma dużą gęstość momentu. Przekładnia może zmieniać kierunek obrotów i może pracować jako hamulec.
The magnetic transmission presented in the article consists of an external rotor, an internal rotor and a fixed ring between these rotors. On the yokes, permanent magnets are attached from the side of the magnetic ring. The external rotor is low speed (n1 ) with the number of pole pairs (p1 ). The internal rotor is high-speed (n2 ) with the number of pole pairs (p2 ). The rotor speed ratio is [wzór]. The ring has grooves on both the outside and the inside. The winding is placed in slots. The gearbox has a high torque density. The gearbox can change direction of rotation and can work as a brake.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2019, 3-4, 123-124; 51--55
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przekładnia magnetyczna prędkości obrotowej
Rotational speed magnetic gear
Autorzy:
Bernatt, Jakub
Gawron, Stanisław
Glinka, Tadeusz
Król, Emil
Powiązania:
https://bibliotekanauki.pl/articles/304920.pdf
Data publikacji:
2020
Wydawca:
Wydawnictwo Druk-Art
Tematy:
przekładnia mechaniczna
magnesy trwałe
rewersja obrotów
hamowanie
mechanical transmission
permanent magnets
reverse rotation
braking
Opis:
Przekładnia magnetyczna przedstawiona w artykule składa się z wirnika zewnętrznego, wirnika wewnętrznego i nieruchomego pierścienia umieszczonego między tymi wirnikami. Na jarzmach od strony pierścienia magnetycznego są przymocowane magnesy trwałe. Wirnik zewnętrzny jest wolnoobrotowy (n1) o liczbie par biegunów p1. Wirnik wewnętrzny jest szybkoobrotowy (n2) o liczbie par biegunów p2. Stosunek prędkości obrotowej wirników wynosi . Pierścień zarówno od strony zewnętrznej, jak i wewnętrznej ma żłobki. Uzwojenie jest umieszczone w żłobkach. Przekładnia ma dużą gęstość momentu i jest ekologiczna (nie ma oleju). Przekładnia może zmieniać kierunek obrotów i może pracować jako hamulec.
The magnetic transmission presented in the article consists of an external rotor, an internal rotor and a fixed ring between these rotors. On the yokes, permanent magnets are attached from the side of the magnetic ring. The external rotor is low speed (n1) with the number of pole pairs (p1). The internal rotor is high-speed (n2) with the number of pole pairs (p2). The rotor speed ratio is . The ring has grooves on both the outside and the inside. The winding is placed in nurseries. The gearbox has a high torque density and is ecological (there is no oil). The gearbox can change direction of rotation and can work as a brake.
Źródło:
Napędy i Sterowanie; 2020, 22, 3; 94-98
1507-7764
Pojawia się w:
Napędy i Sterowanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable rotational speed control system of sewage pumping station
Autorzy:
Szychta, E.
Szychta, L.
Powiązania:
https://bibliotekanauki.pl/articles/116993.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
hydrodynamics
speed control
speed control system
pumping station
sewage pumping station
pump efficiency
control sysytem
pump performance chart
Opis:
Cascade and variable rotational speed control systems of sewage pumping stations are compared in this article. The range of pump efficiency variations and potential for breakdowns are adopted as criteria. A pumping station including two or three pumps is analysed. A control system at a variable rotational speed and maximum sewage level is presented. Properties of a cascade control system and a system at a maximum head of sewage are compared using the example of any pump performance chart.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 2; 343-346
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Irregularity of rotational speed of diesel engine with modified fuel injection system
Autorzy:
Kowalski, D.
Bieniek, A.
Brol, S.
Powiązania:
https://bibliotekanauki.pl/articles/247225.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
injection pump
pollutant emission
electric valves
transport
off-road
Opis:
The operation of diesel engine is closely connected with controlling the process of injecting the fuel into the cylinder. It influences proper combustion process, which translates directly into irregular engine operation resulting in dumping and noise. It is related to improper control of fuel injection which is connected with improper completion of expected control strategy that can be a result of defective injection system. Irregular engine operation can also be caused by total lack of initiated combustion process in specific cylinder of the engine or in several cylinders, described as misfire, or ca be a result of differences in combustion process in individual operation cycles / engine cylinders. The effect is an engine working irregularly (there is instability of rotational speed) and emitting increased amount of pollutants. As a consequence the secondary fuel purification systems located in the exhaust system can be damaged. Therefore, it is required to choose the fuel injection control parameters in a way that enables detecting and correcting the process of fuel injection in order to minimize effects resulting from improper process of fuel combustion in individual cylinders or even lack thereof. It is useful to suggest diagnostic parameter that can be used to detect engine faultiness or elements of the accessories such as e.g. injection system. Ability to apply such control and correction of injection dose is provided by modified mechatronic in-line injection pump. The study shows results of researches on modified injection system with mechatronic in-line injection pump that enables identification of misfire and preventing irregular operation of diesel engine.
Źródło:
Journal of KONES; 2011, 18, 4; 199-204
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of diagnostic utility of torque and rotational speed fluctuation of propulsion shaft
Autorzy:
Dereszewski, M.
Polanowski, S.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/247279.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine diesel engine
diagnostics
failure simulation
torque and speed analysis
Opis:
In the paper has been presented the analysis of diagnostic utility of signals, deriving from torque (measured value is an instantaneous shaft's torsion angle, torque value is subsequently calculated basing on shaft's steel Kirhoff's modulus or Young's modulus values) and angular acceleration of the propulsion shaft. All measurements has been carried out using photo optic torque meter ETNP-10, which was installed at the propulsion shaft run by two-stroke low speed marine diesel engine. In order to distinguish diagnostic signals, measurements of healthy engine run and subsequently simulations of a failure by one cylinder cut-off (suspending of a fuel pump) were done. Analysis of torque, revolutionary speed, angular acceleration were and subsequently, in order to distinguish spectral attributes of above functions, fast Fourier transform of speed waveforms were carried out. Diagrams presented in the paper shows comparison of mentioned above signals' waveforms. The most significant influence of simulated combustion process deviation at a signal's variation was noticed when rotational speed and angular acceleration of the shaft were considered. Acquired results of research and measurements are to be a subject of further analysis in order to define representative symptoms and diagnostic values corresponding to propulsion system and engine failures.
Źródło:
Journal of KONES; 2011, 18, 4; 77-83
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of engine rotational speed on the natural frequencies of the turbine blade
Autorzy:
Witek, L.
Powiązania:
https://bibliotekanauki.pl/articles/242083.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turbine blade
modal analysis
resonant frequency
finite element method
experimental analysis
Opis:
In this work, the influence of the engine rotational speed on the natural frequencies of the turbine blade was investigated. In first part of the work the experimental modal analysis of the blade were made using the vibration system. The investigated blade was fixed to the movable head of the shaker. The blade amplitude was measured using the piezoelectric accelerometers. As results of experimental modal analysis, the resonant frequencies for first three modes of vibration were determined. In the next step of the work, the numerical models of the blades with different size of the finite elements were performed in order to check the convergence of the numerical solution. For each models the natural frequencies were determined for the non-rotated blade. The numerical results were next compared to the results of experimental modal analysis. After this comparison, one model only was selected for the further computations. In the last part of the work, the complex multi-steps analysis was performed in order to investigate the influence of turbine rotational speed on the modes and natural frequencies of the blade. Obtained results are important from both the research and also the practical point of view and have an influence on reliability of the engine.
Źródło:
Journal of KONES; 2016, 23, 1; 421-428
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New design of circular saw blade body and its influence on critical rotational speed
Autorzy:
Droba, A.
Javorek, L.
Svoren, J.
Pauliny, D.
Powiązania:
https://bibliotekanauki.pl/articles/52262.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Opis:
Oscillation is an unwelcome state as it has adverse effects not only on the work piece but also on the tool. This paper deals with the problem of circular saw blade oscillation and the effect of modification of the circular saw blade body on the natural frequency as well as on the critical rotational speed. The calculation and experimental investigation of the natural frequencies and node shapes on two types of circular saw blades were carried out. Two methods used to determine the natural frequencies are presented: the first, modal analysis (FEM), a theoretical method, and the second, experimental measurement. The results of the investigation were used to compare the FEM and experimental methods and to show which modification achieved a higher critical rotational speed. Both methods were conducted on two circular saw blades for continual cutting with 36 teeth and slots.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2015, 58, 194
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of rotational speed of a self-aspirating mixer on oxygen saturation in water
Autorzy:
Wróblewski, Andrzej
Skotnicka-Siepsiak, Aldona
Powiązania:
https://bibliotekanauki.pl/articles/1585063.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
water aeration
self-aspirating mixer
tubular mixer
Opis:
There are two categories of gas-liquid mixers: conventional and special-purpose. In theory, any conventional mixer can be applied to aerate a liquid, but fast-rotating devices are generally preferred. Special-purpose mixers (tubular, prismatic, cylindrical) have a hollow shaft, and operate by drawing gas from above the surface of the liquid and dispersing it inside the liquid. This process is referred to as aspirated aeration. In contrast, conventional mixers increase the pressure of the aspirated gas. Gas drawn from above the surface of the liquid flows through channels bored inside the shaft and the impeller, and is introduced to the liquid in this way. This article presents the results of an experiment investigating the aeration efficiency of a six-tube self-aspirating mixer at different rotational speeds. The experiment was conducted in a flow tank. The results indicate that self-aspirating mixers are effective devices for water aeration and mixing.
Źródło:
Polish Maritime Research; 2020, 3; 182-188
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial Excitation Issues of Synchronous Generator with VSI Inverter in Varying Rotational Speed Operation
Autorzy:
Kozak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2064987.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
synchronous generator
initial excitation
FOC control
voltage source inverter
synchronization
Opis:
Synchronous self-excited generators still are and probably will be the most popular 3-phase alternators installed in inland power stations so onboard of seagoing ships. Because of fuel savings and environmental restrictions Diesel, dual-fuel and gas propulsion engines for alternators of wide-range varying revolutions drives are increasingly used. There must be efficient way of creating 3-phase voltages of desired constant parameters ensured when generator produces variable amplitudes and frequencies of voltages because of changing rotational speed. As the control method modified field oriented control widely used with squirrel cage induction machines was chosen. This control method involves decoupling of currents and control voltages to flux and torque components and keeping them in optimal (orthogonal) condition. In order to obtain proper excitation and operation of such generator several factors have to be taken into account. Nonlinear dependence of voltage generated from rotational speed of self-excited synchronous generator is one of the factors that affects initial excitation process thus specific control method while generator startup. Theoretical background of synchronous generator excitation and voltage source inverter adopted FOC control method along with experimental results obtained in laboratory test bench of 5,5 kW generator and conclusions were presented.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 377--383
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Device for Measuring the Rotational Speed of a Chain Sprocket of a Petrol Chainsaw
Autorzy:
Wróbel, Mateusz
Jakubek, Bartosz
Rukat, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2123289.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
magnetic field
chainsaw
rotational speed measurement
chain sprocket
hall effect sensor
Opis:
The procedure for determining the frequency-weighted RMS values of vibration accelerations in the case of petrol chainsaws proposes equal time shares of three operation modes of the chainsaw. In order to assess the actual operator’s vibration exposure, it is necessary to precisely determine the above-mentioned shares. In real-life conditions operation of chainsaws is characterized by frequent and significant rotational speed changes depending on the operation mode. Therefore, a prototype of dedicated device for measuring the rotational speed of a chain sprocket was developed. The article presents development requirements, encountered problems and their solutions, the prototype itself and functional test results.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 99--107
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of rotational speed of the drum on physical properties of granulated compost fertilizer
Autorzy:
Ghasemi, Y.
Kianmehr, M. H.
Mirzabe, A. H.
Abooali, B.
Powiązania:
https://bibliotekanauki.pl/articles/109863.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
drum granulation
compost fertilizer
drum
rotational speed
fracture force
granule size
granule mass
Opis:
Granulation is one of the fundamental operations in particulate processing which has an ancient history and a widespread use. Compost fertilizer was granulated using drum granulation method under different level of drum rotational speed. Rotational speed of the drum (ω) ranged from 40 to 60 rev min–1 (40, 45, 50, 55 and 60 rev min–1). The effect of rotational speed of the drum (ω) on some physical properties of granulated compost fertilizer including: useful granules, granules size, fracture force, mass of the granules, bulk density, angle of friction and angle of repose are investigated in the present study.Results indicated that with the increasing drum rotational speedthe percentage of useful granules, fracture force, bulk density, angle of friction and angle of reposeincrease from 69.91% to 80.88%, 34.35 N to 35.23 N, 743.23 to 765.08 kg m–3, 26.50 to 28.01º and 10.83 to 12.88º, respectively. Also the average size of granules decreases from10.15 to 7.05 mm.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 743-755
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the influence of rotational speed on the performance of high-speed permanent-magnet generator
Autorzy:
Qiu, Hongbo
Wei, Yanqi
Zhao, Xi Fang
Yang, Cunxiang
Yi, Ran
Powiązania:
https://bibliotekanauki.pl/articles/141641.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-speed permanent-magnet generator (HSPMG)
harmonic content
maximum power
overload capacity
voltage regulation
Opis:
When the machine is at high speed, serious problems occur, such as high frequency loss, difficult thermal management, and the rotor structural strength insufficiency. In this paper, the performances of two high-speed permanent magnet generators (HSPMGs) with different rotational speeds and the same torque are compared and analyzed. The two-dimensional finite element model (FEM) of the 117 kW, 60 000 rpm HSPMG is established. By comparing a calculation result and test data, the accuracy of the model is verified. On this basis, the 40 kW, 20 000 rpm HSPMG is designed and the FEM is established. The relationship between the voltage regulation sensitivity and power factor of the two HSPMGs is determined. The influence mechanism of the voltage regulation sensitivity is further revealed. In addition, the air-gap flux density is decomposed by the Fourier transform principle, and the influence degree of different harmonic orders on the HSPMG performance is determined. The method to reduce the harmonic content is further proposed. Finally, the method to improve the HSPMG overload capacity is obtained by studying the maximum power. The research showed that the HSPMG at low speed (20 000 rpm) has high sensitivity of the voltage regulation, while the HSPMG at high speed (60 000 rpm) is superior to the HSPMG at low speed in reducing the harmonic content and increasing the overload capacity.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 77-90
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza elektromechanicznego przetwornika momentu i prędkości obrotowej
Analysis of the electromechanical torque and rotational speed converter
Autorzy:
Walecki, K.
Powiązania:
https://bibliotekanauki.pl/articles/1812127.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
elektromechaniczny przetwornik momentu
silnik i prądnica na wspólnym stojanie
wariator
straty w materiałach ferromagnetycznych
Opis:
The electromagnetic torque converter consists of the symmetric generator and motor parts, as well as the common armature. It is a subject of patent which was issued in 1995. The laboratory tests of prototype validated the principle of work. Yet the losses preclude the practical application of the converter. The paper presents the tests results and indicates the possibilities to minimize losses.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 261-267
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka rozruchowej prędkości obrotowej silnika o zapłonie samoczynnym
Characteristic of starting rotational speed of self-ignition engine
Autorzy:
Pszczółkowski, J.
Koliński, K.
Powiązania:
https://bibliotekanauki.pl/articles/209059.pdf
Data publikacji:
2006
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
silniki spalinowe
rozruch w niskiej temperaturze
diesel engine
starting at low temperature
Opis:
Scharakteryzowano cechy przebiegu zmian wartości chwilowej i średniej prędkości obrotowej wału korbowego silnika o zapłonie samoczynnym podczas jego napędzania za pomocą elektrycznego układu rozruchowego. Zaproponowano parametry oceny zmian chwilowej predkości obrotowej: nierównomierności i asymetrii przebiegów jej wartości. Dokonano analizy wpływu wartości prędkości obrotowej wału korbowego na proces rozruchu silnika ze szczególnym uwzględnieniem jej wpływu na parametry spężanego powietrza i charakterystyki rozpylania wtryskiwanego do cylindrów silnika paliwa. Scharakteryzowano kryteria identyfikacji i podano charakterystyczne dla rozruchu silników o zapłonie samoczynnym wartości rozruchowej prędkości obrotowej.
Features of the course of temporary and mean values change of engine crankshaft rotational speed during its driving by an electric starting system were characterized. The parameters for evaluation of its temporary value change are proposed: irregularity and asymmetry of its course. There is made the analysis of crankshaft rotational speed influence on diesel engine start-up process taking into account its impact on compressed air load parameters and characteristics of cylinders fuel spraying injected into engine. The identification criterions are given and characteristic values of diesel engine start-up rotational speed are defined.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2006, 55, 3; 97-112
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the influence of mold rotational speed on the cast wall thickness in the rotational molding process
Autorzy:
Jachowicz, T.
Sikora, J.W.
Powiązania:
https://bibliotekanauki.pl/articles/103027.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
rotational molding process
mold rotational speed
polymer cast
Opis:
This paper presents the rotational molding process. The general principles of this polymer processing technology have been described. The main applications have been introduced and leading advantages and typical disadvantages of rotational molding process have been discussed. Based on the conducted experimental tests, the influ¬ence of changing one selected technological parameter, which characterized rotational molding process, on selected geometrical features of the polymer cast has been deter¬mined. Rotational mold’s speed around axes was changed and a thickness of cast walls has been measured. Laboratory test stand, processing properties of polymer, also test program and experimental test methodology have been described.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 19; 79-87
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 76

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