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    Wyświetlanie 1-6 z 6
    Tytuł:
    Control of a drone: study and analysis of the robustness
    Autorzy:
    Zemalache, K. M.
    Beji, L.
    Maaref, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/384519.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    self-tunable fuzzy interference system
    static feedback linearization controller
    tracking control
    dynamic systems
    drone
    Opis:
    The work describes an automatically on-line Self-Tunnable Fuzzy Interference Systems (STFIS) of a new configuration of mini-flying called XSF (X4 Stationary Flyer) drone. A Fuzzy controller based on-line optimization of a zero order Takagi-Sugeno fuzzy interference system (FIS) by a back propagation like algorithm is successfully applied. It is used to minimize a cost function that is made up of a quadratic error term and a weight decay term that prevents an excessive growth of parameters. Thus, we carried out control for helical trajectories by using the STFIS technique. This permits to prove the effectiveness of the proposed control law. Simulation results and a comparison with a Static Feedback Linearization controller (SFL) are presented and discussed. We studied the robustness of the two used controllers in the presence of disturbances. We presented the case of an engine breakdown as well as a gust of wind and taking into account white noise disturbances.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2008, 2, 1; 33-42
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static and dynamic analysis of telescopic boom of self-propelled tunnelling machine
    Statyczna i dynamiczna analiza wysięgnika teleskopowego samojezdnej maszyny górniczej
    Autorzy:
    Derlukiewicz, D.
    Karliński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/281882.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    finite element method
    strength calculations
    static and dynamic analysis
    self-propelled mining machines
    Opis:
    The paper presents selected aspects of the strength analysis of the self- propelled tunnelling machine boom. The principles of creating calculation models for numerical simulations with use of the finite element method are given. The study also presents two ways of conducting numerical calculations in both the static and dynamic range. A detailed example of numerical FEM tests of the telescopic boom is provided.
    W artykule zaprezentowano wybrane zagadnienia dotyczące metodyki wykonywania analiz wytrzymałościowych wysięgników samojezdnych maszyn górniczych przy pomocy metody elementów skończonych. Przedstawiono zasady budowania modeli obliczeniowych. W pracy zaprezentowano przykłady liczbowe obejmujące analizy wytrzymałościowe wykonane dla obciążeń statycznych i dynamicznych.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2012, 50, 1; 47-59
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating Threat Perception Among Correctional Officers in the Canadian Provincial Correctional System
    Autorzy:
    Ricciardelli, Rosemary
    Gazso, Amber
    Powiązania:
    https://bibliotekanauki.pl/articles/2106939.pdf
    Data publikacji:
    2013-07-31
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    Prison
    Violence
    Sense of Self
    Corrections Officer
    Static Self
    Interaction
    Opis:
    This paper presents findings regarding the perception and experience of threat among correctional officers in the Canadian provincial correctional system. Men employed in provincial remand centers or corrections institutions in diverse provinces across Canada, who interact daily with prisoners, voluntarily participated in detailed 60- to 180-minute in-depth interviews. Analysis of interview transcripts reveals that violence is prevalent and men either experience or anticipate experiencing physical or verbal victimization at work. Additionally, officers employ strategies, such as a confident and authoritative self-presentation, building positive relationships with colleagues, and respectful relationships with prisoners, to mitigate this threat. However, we found that threat to safety extended beyond simply those of physical or verbal victimization to include threat to men’s sense of self. Specifically, victimization and violence or their threat shape officer’s self-concept over time; the ways officers interact within their prison work environment creates a shift in their self that extends beyond the prison walls.
    Źródło:
    Qualitative Sociology Review; 2013, 9, 3; 96-120
    1733-8077
    Pojawia się w:
    Qualitative Sociology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The assessment of the pollutant emission from the self ignition engine in its different operating states
    Autorzy:
    Chłopek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/223806.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    self ignition engine
    pollutant emission
    static test
    dynamic test
    silnik wysokoprężny
    emisja zanieczyszczeń
    test statyczny
    test dynamiczny
    Opis:
    Paper presents the results of pollutant emission tests from the self ignition engine in various states of its operation. Engine operating states were obtained on the engine test stand. The investigations were conducted in static and dynamic tests, both standard used in the type approval procedures as special ones, simulating specific engine operating conditions. The specific brake emission of carbon monoxide as well as those of hydrocarbons, nitrogen oxides and particulate matter, averaged during the tests, have been determined. The influence of the engine operating states on the pollutant emission of impurities has been evaluated. Very high sensitivity was established of the pollutant specific brake emission on the operating states of the engine, both static ones and dynamic.
    Źródło:
    Archives of Transport; 2014, 29, 1; 7-16
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Torque characteristics of double-stator permanent magnet synchronous machines
    Autorzy:
    Awah, C. C,
    Okoro, O. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/140529.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fault-tolerance
    mutual-and self-inductance
    power
    static torque and torque-density
    Opis:
    The torque profile of a double-stator permanent magnet (PM) synchronous machine of 90 mm stator diameter having different rotor pole numbers as well as dual excitation is investigated in this paper. The analysis includes a comparative study of the machine’s torque and power-speed curves, static torque and inductance characteristics, losses and unbalanced magnetic force. The most promising flux-weakening potential is revealed in 13- and 7-rotor pole machines. Moreover, the machines having different rotor/stator (Nr/Ns) pole combinations of the form Nr = Ns ± 1 have balanced and symmetric static torque waveforms variation with the rotor position in contrast to the machines having Nr = Ns ± 2. Further, the inductance results of the analyzed machines reveal that the machines with odd rotor pole numbers have better fault-tolerant capability than their even rotor pole equivalents. A prototype of the developed double-stator machine having a 13-pole rotor is manufactured and tested for verification.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 4; 815-828
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Analysis of Dynamic PUCCH Allocation Algorithm in LTE Network
    Autorzy:
    Czerniecki, Maciej
    Wszołek, Jacek
    Sikora, Marek
    Ludwin, Wiesław
    Powiązania:
    https://bibliotekanauki.pl/articles/226869.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimization
    planning
    PUCCH dimensioning
    network planning
    network optimization
    self-organizing networks
    SON
    dynamic PUCCH allocation
    static PUCCH allocation
    Opis:
    The aim of the presented paper was to verify the impact of Dynamic PUCCH Resource Allocation Algorithm of the LTE cellular system on the maximum uplink cell throughput and call setup success rate - CSSR. Paper includes the laboratory testbed description and presents the results of an experiment confirming the improvement of both key performance indicators KPIs. Apart from the presentation of the Dynamic PUCCH Resource allocation algorithm, the paper also includes a description of legacy LTE uplink (PUCCH and PUSCH) channels dimensioning process thus filling the gap of such a tutorial in the available literature.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 211-216
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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