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Wyszukujesz frazę "control efficiency" wg kryterium: Temat

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Improving efficiency of pH control by balance-based adaptive control application
    Autorzy:
    Stebel, K.
    Czeczot, J.
    Metzger, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/229312.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    process control
    adaptive control
    pH process
    control efficiency
    controller tuning
    Opis:
    This paper deals with the efficient control of the pH process. Considering the PI + gain scheduling (PI+GS) controller as the benchmark and its control performance as the base, we investigate experimentally the overall improvement in the control performance obtained by the application of the Balance-Based Adaptive Controller (B-BAC), which requires only the measurement data of the flow rates and pH values. The improvement of the control efficiency is investigated not only in terms of the controlled variable performance but also in terms of the manipulated variable performance considered as the considerable control cost. The application of the B-BAController can ensure lower controlled pH variability at the price of the control effort similar to the PI+GS approach and thus it can improve the overall efficiency of pH control. The second important contribution is the experimental validation of the very simple and intuitive tuning procedure for the B-BAController.
    Źródło:
    Archives of Control Sciences; 2013, 23, 1; 19-40
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cooling water flow influence on power plant unit performance for various condenser configurations setup
    Autorzy:
    Dobkiewicz-Wieczorek, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/2091367.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cooling water
    power plant efficiency
    cooling water flow control
    CHP plant
    efficiency
    Opis:
    This paper presents the influence of cooling water regulation on power plant net efficiency. It was examined whether, for the non-nominal low-pressure turbine load, it is justified to reduce the cooling water pump load, and how it would affect the unit net efficiency. Calculations for two types of power units were carried out: with condensing and extraction-condensing turbine. The tested condensing power plant consists of three surface condensers. The calculation included four condensers’ connections set up on the cooling water side to check how the cooling water system pressure drop affects the net unit performance. The result has confirmed that implementing serial connection decreases net efficiency when cooling water flow regulation is used, but the mixed connection should be applied when pump load is not controlled. It was proved that the cooling water flow control gives a profit for both units. Net efficiency for combined heat and power plant can be improved by 0.1–0.5 pp, the gain is remarkable below 60% of the low-pressure turbine part load. Flow control implementation in the unit with condensing turbine water control gives a similar profit just below 80% of the turbine load. Next, an influence of the additional limitations of a cooling water system (minimal total pump head, cooling tower) affecting the feasibility of implementing the water control has been considered. Applying a multi-cell forced draft cooling tower does not have a significant impact on results, but when a natural draft cooling tower is used, the flow control range is strongly reduced.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 1; 141--167
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation and experimental results of hybrid electric machine with a novel flux control strategy
    Autorzy:
    Paplicki, P.
    Wardach, M.
    Bonisławski, M.
    Pałka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140694.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PM machines
    FEM analysis
    experimental results
    control strategy
    field control capability
    efficiency maps
    Opis:
    The paper presents selected simulation and experimental results of a hybrid ECPMS-machine (Electric Controlled Permanent Magnet Synchronous Machine). This permanent magnets (PMs) excited machine offers an extended magnetic field control capability which makes it suitable for battery electric vehicle (BEV) drives. Rotor, stator and the additional direct current control coil of the machine are analyzed in detail. The control system and strategy, the diagram of power supply system and an equivalent circuit model of the ECPMS-machine are presented. Influence of the additional excitation on the performance parameters of the machine, such as: torque, efficiency, speed limits and back-EMF have also been discussed.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 1; 37-51
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Building Energy Efficient Wireless Sensor Networks
    Autorzy:
    Cherepanov, A.
    Tyshchenko, I.
    Popova, M.
    Vakhnin, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/226609.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless sensor network
    energy efficiency
    signals
    systems
    automated control system
    Opis:
    This article provides an overview of the existing problems in the construction of wireless sensor networks (WSN), in particular the problem of energy efficiency of the system. In many cases, the WSN is set in places where the connection to the stationary power sources is difficult or impossible. Such situations require the use of autonomous energy sources: traditional (batteries) or alternative (solar panels, wind generators, etc.). Due to limitations in the available system power there is obvious need in efficient use of available energy resources.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 1; 45-49
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Issues of exploitation of induction motors in the course of underground mining operations
    Problemy eksploatacji silników indukcyjnych w warunkach górnictwa podziemnego
    Autorzy:
    Gumula, S.
    Hudy, W.
    Piaskowska-Silarska, M.
    Pytel, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/219589.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    maszyny górnicze
    silniki elektryczne
    sterowanie
    wskaźniki efektywności
    mining machinery
    electric motors
    control
    efficiency indicators
    Opis:
    Mining industry is one of the most important customers of electric motors. The most commonly used in the contemporary mining industry is alternating current machines used for processing electrical energy into mechanical energy. The operating problems and the influence of qualitative interference acting on the inputs of individual regulators to field-oriented system in the course of underground mining operations has been presented in the publication. The object of controlling the speed is a slip-ring induction motor. Settings of regulators were calculated using an evolutionary algorithm. Examination of system dynamics was performed by a computer with the use of the MATLAB / Simulink software. According to analyzes, large distortion of input signals of regulators adversely affects the rotational speed that pursued by the control system, which may cause a large vibration of the whole system and, consequently, its much faster destruction. Designed system is characterized by a significantly better resistance to interference. The system is stable with the properly selected settings of regulators, which is particularly important during the operation of machinery used in underground mining.
    Branża górnicza jest jednym z ważniejszych odbiorców silników elektrycznych. Najpowszechniej stosowane w branży górniczej są obecnie maszyny prądu przemiennego służące do przetwarzania energii elektrycznej w energię mechaniczną. W artykule przedstawiono problemy eksploatacji i wpływ jakościowy zakłóceń działających na sygnały wejściowe poszczególnych regulatorów w układzie polowo-zorientowanym w warunkach górnictwa podziemnego. Obiektem sterowania prędkością obrotową jest silnik indukcyjny pierścieniowy. Nastawy regulatorów obliczono przy zastosowaniu algorytmu ewolucyjnego. Badanie dynamiki układu przeprowadzono metodą komputerową korzystając z oprogramowania MATLAB/ Simulink. Jak wynika z analiz, duże zakłócenie sygnałów wejściowych regulatorów niekorzystnie wpływa na przebieg prędkości obrotowej realizowanej przez układ sterowania, co może spowodować wystąpienie dużych drgań całego układu, a w konsekwencji jego znacznie szybsze zużycie. Przy odpowiednio dobranych nastawach regulatorów zaprojektowany układ charakteryzuje się większą odpornością na zakłócenia i jest przy tym stabilny, co jest szczególnie istotne w trakcie eksploatacji urządzeń wykorzystywanych w górnictwie podziemnym.
    Źródło:
    Archives of Mining Sciences; 2017, 62, 3; 579-596
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The efficiency of detecting the failures and troubleshooting while applying technical diagnostics for multi-computer systems
    Autorzy:
    Ye, K. Z.
    Kyaw, H. A.
    Portnov, E. M.
    Bain, A. M.
    Vasant, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/229469.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technical diagnostics
    fault
    identification
    ‘AND-OR’ graph
    efficiency
    control devices
    multi-machine power system
    troubleshooting
    majority principle
    Opis:
    This paper presents techniques which base on the concept of flows thinning together with the identification techniques. These methods are proposed to determine the expected number of failures to assess the efficiency of technical diagnostics of instruments. Additionally, this research focuses on the improvement of multi-machine troubleshooting systems, based on the ‘AND-OR’ graphs. Respective algorithms are presented. The majority principle uses the input information to check the correctness of the decision regarding identification of faulty machines. In this paper we base on the complete testing algorithm for elements of multi-computer complexes searching by criteria of failed element.
    Źródło:
    Archives of Control Sciences; 2015, 25, 1; 87-107
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of automated mine ventilation control systems for Belarusian potash mines
    Autorzy:
    Semin, Mikhail A.
    Levin, Lev Y.
    Maltsev, Stanislav V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1853845.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wentylacja kopalni
    wentylator
    automatyczne sterowanie wentylacją
    mine ventilation
    ventilation on demand
    automated ventilation control
    energy efficiency
    main fan
    ventilation door
    potash mines
    Opis:
    In recent decades, two different approaches to mine ventilation control have been developed: ventilation on demand (VOD) and automatic ventilation control (AVC) systems. The latter was primarily developed in Russia and the CIS countries. This paper presents a comparative analysis of these two approaches; it was concluded that the approaches have much in common. The only significant difference between them is the optimal control algorithm used in automatic ventilation control systems. The paper describes in greater detail the algorithm for optimal control of ventilation devices that was developed at the scientific school of the Perm Mining Institute with the direct participation of the authors. One feature of the algo-rithm is that the search for optimal airflow distribution in the mine is performed by the system in a fully automated mode. The algorithm does not require information about the actual topology of the mine and target airflows for the fans. It can be easily programmed into microcontrollers of main fans and ventilation doors. Based on this algorithm, an automated ventilation control system was developed, which minimizes energy consumption through three strategies: automated search for optimal air distribution, dynamic air distribution control depending on the type of shift, and controlled air recirculation systems. Two examples of the implementation of an automated ventilation control system in potash mines in Belarus are presented. A significant reduction in the energy consumption for main fans’ operation obtained for both potash mines.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 4; 803-820
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie statystycznej kontroli jakości w ocenie działalności Oczyszczalni Ścieków „Kujawy” w Krakowie
    The use of statistical quality control in the assessment of the waste water treatment plant “Kujawy” in Cracow
    Autorzy:
    Śliz, Paulina
    Powiązania:
    https://bibliotekanauki.pl/articles/2032394.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wastewater management
    efficiency of work
    reliability of the purifying process
    control charts
    sewage treatment plant
    gospodarka ściekowa
    wydajność pracy
    niezawodność oczyszczania
    karty kontrolne
    oczyszczalnia ścieków
    Opis:
    The aim of the research was the evaluation of wastewater management in terms of stability and efficiency of wastewater treatment, using statistical quality control. For this purpose, the analysis of the operation and operation of the “Kujawy” Sewage Treatment Plant was made, which is one of the most important and largest sewage management facilities in the city of Cracow. This assessment was done using control charts x for 59 observations. The analysed research period covered the multi-year from 2012 to 2016. Five key pollutant indicators were used to evaluate the work of the tested object: BOD5 , CODCr, total suspension, total nitrogen and total phosphorus. In the case of the majority of them, based on the analysis of control charts, full stability of their removal was found in the tested sewage management facility. The exception was total nitrogen, for which periods of disturbed stability of its disposal processes were noted. Analysis of the effectiveness of wastewater treatment showed each time that the required efficiency of reduction of the analysed pollution indicators in the “Kujawy” Sewage Treatment Plant was achieved.
    Źródło:
    Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN; 2018, 272; 382-391
    0079-3493
    Pojawia się w:
    Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On-line losses minimization of induction motor vector control
    Autorzy:
    Rouabah, Z.
    Abdelhadi, B.
    Anayi, F.
    Zidani, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/141053.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    minimalizacja strat
    efektywność
    sterowanie polowo zorientowane
    silnik indukcyjny
    algorytm genetyczny kodowania rzeczywistego
    loss minimization
    efficiency
    field-oriented control
    FOC
    induction motor
    real-coded genetic algorithm
    RCGA
    Opis:
    Conventional field-orientated Induction motor drives operate at rated flux even at low load. To improve the efficiency of the existing motor it is important to regulate the flux of the motor in the desired operating range. In this paper a loss model controller (LMC) based on the real coded genetic algorithm is proposed, it has the straightforward goal of maximizing the efficiency for each given load torque. In order to give more accuracy to the motor model and the LMC a series model of the motor which consider the iron losses as a resistance connected in series with the mutual inductance is considered. Digital computer simulation demonstrates the effectiveness of the proposed algorithm and also simulation results have confirmed that this algorithm yields the optimal efficiency.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 3; 257-268
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lyapunov stability based sliding mode observer for sensorless control of permanent magnet synchronous motor
    Autorzy:
    Navaneethan, Soundirarajan
    Kanthalakshmi, Srinivasan
    Aandrew Baggio, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173640.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric vehicles
    permanent magnet synchronous motor
    sensorless control
    sliding mode observer
    Lyapunov stability
    tracking efficiency
    pojazdy elektryczne
    silnik synchroniczny z magnesami trwałymi
    sterowanie bezczujnikowe
    obserwator o ślizgowym trybie pracy
    stabilność Lapunova
    wydajność śledzenia
    Opis:
    In recent years there has been an increasing demand for electric vehicles due to their attractive features including low pollution and increase in efficiency. Electric vehicles use electric motors as primary motion elements and permanent magnet machines found a proven record of use in electric vehicles. Permanent magnet synchronous motor (PMSM) as electric propulsion in electric vehicles supersedes the performance compared to other motor types. However, in order to eliminate the cumbersome mechanical sensors used for feedback, sensorless control of motors has been proposed. This paper proposes the design of sliding mode observer (SMO) based on Lyapunov stability for sensorless control of PMSM. The designed observer is modeled with a simulated PMSM model to evaluate the tracking efficiency of the observer. Further, the SMO is coded using MATLAB/Xilinx block models to investigate the performance at real-time.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140353
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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