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Wyszukujesz frazę "Bernat, S." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Awareness of noise hazards and the value of soundscapes in Polish national parks
    Autorzy:
    Bernat, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/177239.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    landscape perception
    noise
    soundscape
    quiet zone
    national parks
    Opis:
    The goal of the studies undertaken in Polish national parks was to determine noise threats, examine the resources, assess the quality of soundscapes and identify the possibilities of their protection. The questionnaire method used in the studies made it possible to identify the awareness of noise threats and the value of soundscapes according to the park service staff. In addition, the semantic differential and description methods were used to learn how students assessed the soundscape quality of Polish national parks. Finally, avenues of further research on soundscape in environmentally valuable areas were indicated. The research findings indicate that each national park in Poland is characterised by diverse and unique soundscapes and is subject to the pressure of road traffic and tourism resulting in noise hazards. The conservation of the acoustic values of parks is necessary and possible.
    Źródło:
    Archives of Acoustics; 2013, 38, 4; 479-487
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Social Conflicts in Poland’s Soundscape as a Challenge to Socio-Acoustics
    Autorzy:
    Bernat, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/177895.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise
    soundscape
    perception
    social conflict
    Polska
    Opis:
    The study objective was to understand the character and location of social conflicts in Poland’s soundscape. The analyses were based on a review of press and Internet articles from the years 2008–2015 and reports on noise, preceded by a review of the legal framework of protection against noise in Poland. Questionnaire surveys concerning Poland’s national parks and health resorts and the city of Lublin were an additional source of information. In the case of the former, the surveys were supplemented with a general examination of the acoustic determinants of social conflicts in the Podzamcze district. An analysis shows that sound in landscape has been a source of more than 100 social conflicts which were most frequently related to unpleasant sounds (noise nuisance) and the right to peace and quiet. The public demands acoustic comfort, one of the determinants of the quality of life. Therefore, it is necessary to know the public opinion on soundscapes (survey of sound preferences). Public consultations concerning the assessment of acoustic disturbance and sound preferences will make it possible to avoid social conflicts arising from insufficient knowledge. A major role is also played by the education of the public and decision-makers through sound awareness campaigns, e.g. as part of ecology education. The subjective assessment of noise nuisance severity and the acoustic design of public spaces should be an integral part of environmental noise control programmes and revitalisation programmes. The conducted studies demonstrated that understanding the character and location of social conflicts in soundscape is a major scientific problem. Its resolution requires combining sociological studies (questionnaire for the valuation of the subjective feelings of respondents) with field analyses (observations, acoustic measurements). It is a promising research field that has been developed to a limited extent so far.
    Źródło:
    Archives of Acoustics; 2016, 41, 3; 415-426
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of optimal current driver for the torque control of BLDC motor
    Autorzy:
    Bernat, J.
    Stępień, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/140879.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silnik bezszczotkowy
    silnik BLDC
    sterowanie
    problem liniowo-kwadratowy
    identyfikacja
    current driver
    BLDC motor
    control law
    linear quadratic problem
    identification
    Opis:
    This research presents the novel control strategy of the brushless DC motor. The optimal current driver is designed using Linear Quadratic Regulator and feedback linearization. Additionally, the current reshaping strategy is applied to control the motor torque. Thus, the torque controller is built based on the optimal current driver. The motor is simulated using the FEM analysis.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 2; 149-158
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of minimum energy control on steel loss in VR stepper motor
    Autorzy:
    Bernat, J.
    Kołota, J.
    Stępień, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/141426.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy consumption
    lamination
    finite element method
    optimal control
    Opis:
    This research presents a 3D FE method for the simulation of the variable reluctance stepper motor dynamics. The proposed model is used to obtain the optimal minimum energy control law that minimizes the energy injected by the controller. The method is based on the strong coupling of field - circuit equations and extended to eddy current, motion and nonlinearity problem. The linearization technique for the coupled problem is presented. Also the lamination of the motor core is considered. In the paper the open - loop control problem is analyzed. The proposed model is validated by the comparison with measurements. Next, to demonstrate the effectiveness of the proposed optimal minimum energy control method is applied. In both cases, the examination of the variable reluctance stepper motor dynamics and the steel loss in the core is presented and compared.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 3; 439-447
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-layer observer as new structure for state estimation in linear systems
    Autorzy:
    Bernat, J.
    Kołota, J.
    Superczyńska, P.
    Stępień, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/140374.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Luenberger observer
    Multi Observer
    electric DC motor
    Opis:
    A new structure to design observers for linear systems is presented in this work. The key step is the construction of two layers where the first consists of multiple observers and the second connects them providing the weighted estimation state. The main difficulty is to find a new feedback which is responsible for control weights. To define observation law, we rely on multi observers from the first layer. The proposed structure significantly improves the transient characteristics of the observation process, which is shown in illustrative examples.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 3; 507-521
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An inductance lookup table application for analysis of reluctance stepper motor model
    Autorzy:
    Bernat, J.
    Kołota, J.
    Stępień, S.
    Szymański, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/141315.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silnik krokowy
    metoda elementów skończonych
    tablica przeglądowa
    stepper motor
    finite element method
    control
    inductance lookup table
    Opis:
    This research presents a method of modeling and numerical simulation of a reluctance stepper motor using reduced finite-element time-stepping technique. In presented model, the circuit equations are reduced to non-stationary differential equations, i.e. the inductance mapping technique is used to find relationship between coil inductance and rotor position. A strongly coupled field-circuit model of the stepper motor is presented. In analyzed model the magnetostatic field partial differential equations are coupled with rotor motion equation and solved simultaneously in each iterative step. The nonlinearity problem is solved using Newton-Raphson method with spline approximation of the B-H curve.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 1; 15-21
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suboptimal control of nonlinear continuous-time locally positive systems using input-state linearization and SDRE approach
    Autorzy:
    Bernat, J.
    Kołota, J.
    Stępień, S.
    Superczyńska, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200111.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    positive nonlinear systems
    feedback control
    Riccati equation
    sprzężenie zwrotne
    układy nieliniowe
    równanie Riccatiego
    Opis:
    The infinite time suboptimal control problem for continuous-time nonlinear positive systems is formulated and solved. A solution to the problem using input-state linearization and state-dependent Riccati equation method (SDRE) is established, a procedure for solving the problem is proposed and illustrated with a numerical example.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 17-21
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infinite time horizon optimal current control of a stepper motor exploiting a finite element model
    Autorzy:
    Bernat, J.
    Stępień, S.
    Stranz, A.
    Szymański, G.
    Sykulski, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200378.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimal control theory
    linear quadratic problem
    finite element method
    teoria sterowania optymalnego
    liniowo-kwadratowy problem
    metoda elementów skończonych
    Opis:
    An optimal control theory based method is presented aiming at minimizing the energy delivered from source and the power loss in a stepper motor circuit. A linear quadratic current regulator with an infinite time horizon is employed and its appropriateness for this type of a problem explained. With the purpose of improving the accuracy of the control system, the self and mutual inductances of windings are calculated using a finite element model. The numerically computed results are verified experimentally.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 835-841
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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