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    Wyświetlanie 1-4 z 4
    Tytuł:
    High- and low-solids anaerobic digestion in laboratory model fermenter made from silage bags
    Autorzy:
    Rusín, J.
    Kašáková, K.
    Chamrádová, K.
    Staněk, B.
    Obroučka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/780089.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    mobile biogas plant
    high-solids (dry) anaerobic digestion
    silage bag
    discontinuous mode
    semi-continuous mode
    Opis:
    A laboratory physical model of a new type of anaerobic fermenter for “dry” and “wet” anaerobic digestion consisting of silage bags was designed. In the model, the experiment based on high-solids discontinuous anaerobic co-fermentation of agricultural substrates was carried out. It was verified that a horizontal fermenter constructed from silage bags is a suitable type of equipment for the production of biogas. The biogas production peaked at 4th day and was completed by 18th day. Within 18 days of discontinuous high-solids process (18.5-20.0 wt. %TS) the intensity of biogas production reached 1.18 mN3. m-3 . d-1, or 0.0012 mN3. kg-1 . d-1, and the specific methane production 0.01 mN3. kg-1, or 0.07 mN3. kgVS-1. After conversion of the modeling process to a semi-continuous low-solids mode (3.5-5. 5 wt. %TS) during the daily dosage of 87 wt % mixture of biscuit meal EKPO-EB with 13 wt % CaO, the intensity of biogas production reached the value 2.42 mN3 . m-3 . d-1, or 0.0105 mN3 . kg-1 . d-1. The fermentation bag appears to be a more efficient device in the semi-continuous “low-solids” Laboratory model: “(2 inches)”.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 2; 23-28
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and Designing of a Wireless Charging System for Electric Vehicles Using the Topology of Double Sided LLC Compensator
    Autorzy:
    Khademi, Hamid Reza
    Moghaddam, Mahmoud Samiei
    Baygi, Seyed Javad Mohammadi
    Hajizadeh, Amin
    Powiązania:
    https://bibliotekanauki.pl/articles/103301.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wireless charging system
    electric vehicles
    continuous conduction mode
    discontinuous conduction mode
    bezprzewodowy system ładowania
    pojazdy elektryczne
    tryb ciągłego przewodzenia
    tryb przewodzenia nieciągłego
    Opis:
    The purpose of the present study was to simulate the equivalent circuit in the MATLAB software in order to implement the desired relationships for both continuous-conduction mode (CCM) and discontinuous-conduction mode (DCM), and to obtain the power and efficiency values at different frequencies. Then, it was necessary to optimize the effective values on the power by Particle Swarm Optimization (PSO) algorithm. After optimization, the optimization and pre-optimization results were compared and, if post-optimization results were not desirable, effective parameters should be reviewed before the optimization stage and the tunable parameters should be changed to achieve the desired results. This process will continue to obtain the optimization results. The results show that the highest efficiency is 98% in the DCM mode and 95% in the CCM mode. In both methods, we achieved more favorable results than the with the PSO method. However, the DCM mode provides an improvement which is about 2.6% higher than CCM.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 2; 168-175
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability analysis of sliding-mode feedback control
    Autorzy:
    Clarke, F. H.
    Vinter, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/970887.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    sliding-mode control
    discontinuous control
    Lyapunov functions
    stabilization
    robustness
    Opis:
    This paper provides new analytic tools leading to the first rigorous stability and robustness analysis of sliding-mode feedback controllers. Unrestrictive conditions are given, under which these controllers are stabilizing in the presence of large disturbances, conditions invoke the existence of two Lyapunov-type functions, the first associated with passage to the sliding set in finite time, and the second with convergence to the desired state. In this approach, account is taken, from the outset, of implementational constraints. We provide a framework for establishing stability and robustness of the closed-loop system, for a variety of implementation schemes. We illustrate our results by means of two examples of the type frequently encountered in the sliding-mode literature.
    Źródło:
    Control and Cybernetics; 2009, 38, 4A; 1169-1192
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regulation control of an underactuated mechanical system with discontinuous friction and backlash
    Autorzy:
    Rascón, R.
    Rosas, D.
    Hernandez-Balbuena, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/330564.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    underactuated mechanical system
    sliding mode control
    H infinity control
    discontinuous observer
    sterowany układ mechaniczny
    sterowanie ślizgowe
    obserwator nieciągły
    Opis:
    In this work, the problem of position regulation control is addressed for a 2DOF underactuated mechanical system with friction and backlash. For this purpose, a method combining sliding mode and H∞ control is developed. We prove that the application of the method to the nonlinear model considered results in an asymptotically stable equilibria set. Moreover, it is possible to achieve a sufficiently small and bounded steady-state position error even in the presence of disturbances by employing the proposed technique. That is, the developed controller is able to account not only for unmatched external perturbations and model discrepancies of the test rig considered, but also for matched bounded perturbations. The control methodology is presented from both the theoretical and experimental angles to demonstrate the good performance of the proposed controller.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 4; 785-797
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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