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Wyświetlanie 1-15 z 147
Tytuł:
Design concepts of propulsion and steering system for hotel unit of two-segment inland waterways ship
Autorzy:
Dymarski, C.
Rolbiecki, R.
Powiązania:
https://bibliotekanauki.pl/articles/260455.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
shipboard devices
hydraulic drives
electric drives
Opis:
This paper presents design assumptions and two conceptual design solutions of the propulsion and steering system for the hotel barge constituting a part of two-segment inland and coastal navigation ship. Both presented solutions are based on application of a small-power bow thruster with fixed propeller placed in a rotatable nozzle. In one of the solutions the propeller is driven by a hydraulic motor and in the other – by an electric motor. In both solutions the thruster’s column rotating is driven by a hydraulic cylinder.
Źródło:
Polish Maritime Research; 2006, S 2; 62-65
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Derivation of Motor Mean Phase Currents in PMSM Drives Operating with Low Switching-to-Fundamental Frequency Ratio
Autorzy:
Jarzebowicz, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/1193701.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
electric drives
high-speed drives
current control
current measurement
Permanent Magnet Synchronous Drives
Digital Signal Processing
Opis:
Pulse width modulation (PWM) of inverter output voltage causes the waveforms of motor phase currents to consist of distinctive ripples. In order to provide suitable feedback for the motor current controllers, the mean value must be extracted from the currents’ waveforms in every PWM cycle. A common solution to derive the mean phase currents is to sample their value at the midpoint of a symmetrical PWM cycle. Using an assumption of linear current changes in steady PWM subintervals, this midpoint sample corresponds to the mean current in the PWM cycle. This way no hardware filtering or high-rate current sampling is required. Nevertheless, the assumption of linear current changes has been recently reported as over simplistic in permanent magnet synchronous motor (PMSM) drives operating with low switching-to-fundamental frequency ratio (SFFR). This, in turn, causes substantial errors in the representation of the mean phase currents by the midpoint sample. This paper proposes a solution for deriving mean phase currents in low SFFR PMSM drives, which does not rely on the linear current change assumption. The method is based on sampling the currents at the start point of a PWM cycle and correcting the sampled value using a model-based formula that reproduces the current waveforms. Effectiveness of the method is verified by simulation for an exemplary setup of high-speed PMSM drive. The results show that the proposed method decreases the error of determining the mean phase currents approximately 10 times when compared to the classical midpoint sampling technique.
Źródło:
Power Electronics and Drives; 2019, 4, 39; 95-102
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania laboratoryjne generatorów przeznaczonych do szeregowego napędu hybrydowego bezzałogowego aparatu latającego
Laboratory tests of the bldc generators for series hybrid drives unmanned aerial vehicle
Autorzy:
Bogusz, P.
Korkosz, M.
Prokop, J.
Wygonik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1369587.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
napęd hybrydowy
hybrid drives
Opis:
The paper presents the research results of two generators with permanent magnets. The generators have been tested from the point of view of their application in series hybrid propulsion for unmanned Flying device. The external characteristics, performance and efficiency of the generators working with rectifiers were measures. The research was performed for three different types of diodes used in rectifiers.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2012, 2, 95; 105-110
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane problemy związane z kompensacją mocy biernej i filtracją WH w modernizowanych napędach przekształtnikowych
Selected problems of reactive power compensation and higher harmonics filtering in modernized converter drives
Autorzy:
Rak, J.
Jagieła, K.
Gała, M.
Kępiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1369600.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
napędy przekształtnikowe
converter drives
Opis:
The paper deals with requirements that have to be met in design and modernization of electric converter drives. Technical issues connected with compensation of the reactive power and filtering of higher harmonice of the current, occurring during implementation and operation of the drives, are described using selected examples. One of the problems is increase of the voltage distortion at buses of a medium voltage switching station due to mismatch between the LC filter parameters and the current harmonic spectrum after replacing controlled DC drives of the bar rolling mill with squirrel cage motors with frequency converters. Negative effect of the idle run current compensation circuit of a new dry transformer on valve switching in the controlled rectifier after replacing old oil transformers is also described. Diagrams of supply circuits, waveforms of currents and voltages as well as harmonic spectra illustrating discussed problems are presented and conclusions and recommendations are formulated.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2012, 2, 95; 57-63
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of solutions used in high speed induction motor drives operating in household appliances
Autorzy:
Sobczyński, D.
Powiązania:
https://bibliotekanauki.pl/articles/1193147.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
high speed induction motor drives
household appliance drives
power electronic converters
Opis:
The paper presents the high-speed induction motor drive as a alternative for household appliances. Short comparison was made between standard and high-speed motors. The solutions that use three-phase induction motors were given in consideration with different types of rotors: solid or squirrel cage. The assumed power of drive was up to 1 kW. As the power source, single-phase voltage source has been adopted, which was indirectly converted to a three-phase output voltages with the fundamental frequency up to 667 Hz.
Źródło:
Power Electronics and Drives; 2016, 1, 36/1; 27-39
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of parameters of selected converter drives
Autorzy:
Beniak, R.
Powiązania:
https://bibliotekanauki.pl/articles/140818.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
converter drives
parameter estimation
static Scherbius drives
BLDC motors
voltage inverters
Opis:
The paper presents a method for estimation of converter drive parameters. This estimation encompassed three types of drives, i.e. a static Scherbius drive, a driver with a brushless direct current (BLDC) motor and a drive with a voltage inverter. For drive modelling and parameter estimation, the author implemented original program mes written in FORTRAN. As well as these, the paper describes an objective function applied for the estimation. The author also compares gradient and gradientless methods, chich are applied for minimization of the objective function. Finally, the author explains the estimation results for example drives, focusing on the coincidence of theoretical and empirical waveforms. The abovementioned procedure led to the general rule, which facilitates estimation efficiency.
Źródło:
Archives of Electrical Engineering; 2012, 61, 4; 535-565
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency and time domain characteristics of digital control of electric vehicle in-wheel drives
Autorzy:
Jarzebowicz, L.
Opalinski, A.
Powiązania:
https://bibliotekanauki.pl/articles/141142.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
variable speed drives
modeling
digital control events
anti-lock braking
inwheel drives
Opis:
In-wheel electric drives are promising as actuators in active safety systems of electric and hybrid vehicles. This new function requires dedicated control algorithms, making it essential to deliver models that reflect better the wheel-torque control dynamics of electric drives. The timing of digital control events, whose importance is stressed in current research, still lacks an analytical description allowing for modeling its influence on control system dynamics. In this paper, authors investigate and compare approaches to the analog and discrete analytical modeling of torque control loop in digitally controlled electric drive. Five different analytical models of stator current torque component control are compared to judge their accuracy in representing drive control dynamics related to the timing of digital control events. The Bode characteristics and stepresponse characteristics of the analytical models are then compared with those of a reference model for three commonly used cases of motor discrete control schemes. Finally, the applicability of the presented models is discussed.
Źródło:
Archives of Electrical Engineering; 2017, 66, 4; 829-842
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining of model similarity for flexspline of harmonic drive with the use of FEM and extensometer method
Autorzy:
Budzik, G.
Kozik, B.
Pacana, J.
Powiązania:
https://bibliotekanauki.pl/articles/242442.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
mechanics
harmonic drives
flexspline
FEM
extensometers
Opis:
This paper presents an analysis of the feasibility of using the model similarity method in engineering design. The analysis applies to virtual and physical models of the flexspline body of harmonic gear drive. The task consisted in determining stress distribution in the virtual models of the flexspline by means of the finite element method (FEM) and next its verification during bench tests by the extensometer method. The values of stresses calculated by the FEM method and the extensometer method were compared with each other with the aim ofdefming model similarity. The numerical calculations were made by means of the ADINA application which uses FEM with the use of contact elements. Stress distribution calculations applied to simplified virtual models of the flexspline. By the simplification of models a great number of finite elements used for the discretisation process were limited and because of that the time of calculations was shortened. The simplified model was precise enough to determine the stresses in the flexspline body. The subject of this analysis was the impact of different values of the torque moment T2 on the stresses in the flexspline body of the harmonie drive. The results of numerical calculations were checked against the standing tests of the real drive by applying the extensometer method. During the work of the gear, the values of relative elongation were measured and, based on them, the values of stresses were determined and compared to the results of the numerical calculations by FEM in the analogous cross-sections of the flexspline. The comparability of the results received by both methods proves both that the models used in the numerical calculations were properly designed and that the assumptions as well as the calculation were properly made. The determining of model similarity for the examined harmonie drive will make it possible to carry out analyses of stress calculations by FEM on virtual models without the necessity to verify them by laboratory standing tests each time.
Źródło:
Journal of KONES; 2009, 16, 2; 55-60
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining the optimal working point and the loading characteristic of synchronous machine for fan and pump drive system
Autorzy:
Nowak, L.
Kowalski, K.
Stachowiak, D.
Mikołajewicz, J.
Pietrowski, W.
Radziuk, K.
Powiązania:
https://bibliotekanauki.pl/articles/97525.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
synchronous motor
electric motor
pump drives
Opis:
In the paper the computer software for determining the optimal working point of electric motors for fan (and pump) drive systems is presented. The main use of this software is the preliminary designing of permanent magnet synchronous motor for such type of drives. The second task of the software is determining the load characteristic of the fan system (pump system), i.e. relationship between loading torque and angular speed. The obtained characteristics can be used in the designing of control system for fan or pump drives.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 139-149
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of design and application of rotary torque meters for measurement af a small torque
Autorzy:
Bodnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/279723.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
rotary torque meters
mechatronic drives
mechatronic equipment
Opis:
Torque measurements in precise equipment reveal a specific nature, which makes it very difficult or impossible to use many typical methods and measuring devices. Successful implementation of new torque meters prototypes and construction of new OPM/Z series of types allowed for new interesting experiments. New optoelectronic rotary torque meters, characterized by a minimal moment of interia of the rotating subassembly, made it possible to take measurements of the torque both on the rotating and fixed shafts. Computer-aided experimental stands enable registration of a torque signal as well as automatic corrections of the measurement way. Formulation of a matematical model of torque meters combined with numerical simulation allows for optimization of the torque measuring path e.g. by the selection of constructional features of individual elements of the stand.
Problematyka konstrukcji i stosowania momentomierzy obrotowych do pomiaru małych momentów. Istnieje wyraźna specyfika pomiarów momentu obrotowego w urządzeniach precyzyjnych napędzanych mikrosilnikami, utrudniająca, lub uniemożliwiająca wykorzystywanie wielu typowych metod i urządzeń pomiarowych. Opracowanie nowej koncepcji momentomierzy (nazwanych ogólnie typem OPM) i wykonanie kolejnych egzemplarzy w ramach 3 typo-szeregów stworzyło warunki do przeprowadzenia wielu badań doświadczalnych. Nowe optoelektroniczne momentomierze obrotowe o zakresach do 2 Nm wyróżniają się znikomym momentem bezwładności podzespołu wirującego oraz umożliwiają pomiar momentu zarówno na wałku wirującym, jak i unieruchomionym. Opracowane skomputeryzowane stanowiska badawcze pozwoliły na dogodną rejestrację sygnału momentu, często z automatycznymi korektami zwiększającymi dokładność pomiaru. Opracowanie modelu matematycznego momentomierzy typu OPM i wykorzystywanie badań symulacyjnych umożliwiło w praktyce optymalizowanie toru pomiaru momentu poprzez dobór cech konstrukcyjnych części mechanicznej mierników.
Źródło:
Journal of Theoretical and Applied Mechanics; 2000, 38, 3; 499-521
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of criterion for choosing constructional solutions for aeronautical multi-power path gear units
Autorzy:
Kozik, B.
Powiązania:
https://bibliotekanauki.pl/articles/245533.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aeronautical gears
toothed wheels
aeronautical power drives
Opis:
Contemporary aeronautical constructions require applying systems of drive transmission based on gear units. Trends in development of aeronautical gears assume diminishing weight of the gear retaining its basic features which are; the possibility of transmitting high load and reliability. The article presents an analysis of criterion for choosing constructional solutions for aeronautical multi-power path gear units. A few criteria were chosen for the analysis: constructional solutions of aircrafts (planes, helicopters), constructional solutions of engine- moment receiver system and a kind of applied drive. Because the field of issues connected with aeronautical drive transmission systems is very wide, the material and technological factors were not taken into account. They are a subject of separate analysis. The main aim of the presented analysis is determining the criterion for choosing constructional solutions of drives based on existing solutions which allow for implementing new solutions for newly developed aeronautical constructions on the prototype stage. Modernising existing constructional solutions is difficult to put into practice because of procedures followed in the aeronautic industry. That is why the carried out analysis aims at preparing solutions for research on the stage of making a virtual and demonstrative prototype. The final effect of such analysis and research can be developing a solution for gear unit parts assuring the possibility of transmitting a given moment while diminishing, for example, weight in comparison to gears which are produced nowadays. This factor is extremely important for parts of aeronautical constructions.
Źródło:
Journal of KONES; 2011, 18, 3; 169-175
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of ability of machines with hydraulic drive during start-up in low ambient temperatures
Autorzy:
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/244135.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
hydraulic machines
hydraulic drives
diagnostics
hydraulic systems
Opis:
Combustion processes of liquid fuels are more complicated than gases fuels ones. With reference to liquid fuels appear additionally fuel vaporization processes and e.g. with reference to solid fuels - decomposition of the solid phase with processes melting, vaporization, pyrolysis, or gasification. Those processes demand a lot of heat, go ahead slow down than processes in gas phase. The influence of the gases pressure on combustion of liquid and solid fuels, where controlling processes are processes decomposition of these phases, is more complicated and fundamentally differs from the influence of the pressure on combustion processes of gases fuels. The influence is characterized to these that pressurization decreases the intensity decomposition both the liquid phase, and solid one. In the paper assumptions to a model of the combustion process and the model of combustion processes of liquid fuels are presented. Research of the atomization process, ignition and combustion with the using of the LDV and PDPA Doppler laser-equipment and PIV are presented in the paper. Research results of the atomized fuel spray concerning droplet diameters, research result of the atomized fuel spray concerning linear and volumetric dropletlet dispersion, Rosin-Rammler dependences, and results of the analysis of the combustion rate are presented in the paper. On combustion rate of liquid fuels, the essential influence has a kind (laminar, transient and turbulent) and the thickness of the thermal boundary layer around the fuel droplet.
Źródło:
Journal of KONES; 2009, 16, 1; 217-228
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Future of electric cars in the EU
Autorzy:
Gis, W
Waśkiewicz, J
Powiązania:
https://bibliotekanauki.pl/articles/244969.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
cars
transport
carbon dioxide emissions
alternative drives
Opis:
The article presents scenarios for the EU and national development of passenger electric and hybrid cars. The forecast for 2030 of the shares of such vehicles in the total number of new passenger cars sold in various categories in the EU, has been presented. The expected carbon dioxide emissions for this time horizon, in so-called, life cycle of cars in the EU and in Poland, in relation to conventionally powered passenger cars and electric and hybrid cars, have also been presented The results of surveys conducted by the Motor Transport Institute on the interest of residents of the Polish agglomerations in the acquisition and operation of the electric cars in the coming years have been d. Questions and answers referred to the socio - demographic structure of the respondents and their households, the number of classes of the cars owned, monthly household income and self-evaluation of the quality of the income management. Also, the questions were asked about the ownership and extent of use (frequency of use of a car owned and the average annual mileage) and the criteria for the current and future choices of passenger cars (e.g. price class, purpose). The questions also concerned the technical and economic knowledge of electric cars (such as the impact on the natural environment, operating costs), as well as willingness to incur possible costs associated with the purchase of an electric car. The focus was also placed on getting to know the vulnerability of the consumers to the influence of the actions of the propaganda, administrative and economic nature, which may affect the consumers’ decisions concerning the purchase of electric cars and learning about the reasons for any reluctance to use such vehicles.
Źródło:
Journal of KONES; 2014, 21, 2; 83-88
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of the starting and operating of hydraulic components and systems in low ambient temperature (Part I)
Autorzy:
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/258562.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic machines
hydraulic drives
diagnostics
hydraulic systems
Opis:
Severe winters and sweltering summers which more and more often occur nowadays are the reason why machinery designers face many difficulties when designing devices which will be serviceable in extreme ambient conditions. Hence, defining the principles and conditions of safe operation of hydraulically driven machines and devices is essential for their designers and operators. For this reasons the author did a series of tests of hydraulic component and systems in thermal shock conditions (cooled-down component were supplied with hot working medium). In such conditions, starting parameters of the selected hydraulic component and systems which secured safety of their operation were determined. The experimental tests were carried out in the laboratory of the Chair of Hydraulics and Pneumatics, Gdańsk University of Technology.
Źródło:
Polish Maritime Research; 2008, 4; 37-44
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of the starting and operating of hydraulic components and systems in low ambient temperature. Part II. Determining the clearance between cooperating elements during the hydraulic components start-up in extremely low ambient temperatures on the.
Autorzy:
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/258640.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic machines
hydraulic drives
diagnostics
hydraulic systems
Opis:
Severe winters and sweltering summers which more and more often occur nowadays are the reason why machinery designers face many difficulties when designing devices which will be serviceable in extreme ambient conditions. Hence, defining the principles and conditions of safe operation of hydraulically driven machines and devices is essential for their designers and operators. For this reasons the author did a series of tests of hydraulic component and systems in thermal shock conditions (cooled-down components were supplied with hot working medium). The experimental tests were carried out in the laboratory of the Chair of Hydraulics and Pneumatics, Gdańsk University of Technology. They gave answer to the question how the effective clearance changes in such conditions and what parameters it depends on. Based on temperature graphs acquired from tests of heating up elements of hydraulic components it is possible to determine precisely change of clearance between cooperating elements.
Źródło:
Polish Maritime Research; 2009, 1; 61-72
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 147

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