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    Wyświetlanie 1-8 z 8
    Tytuł:
    Constraints in allocation of thrusters in a DP simulator
    Autorzy:
    Zalewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/135012.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    dynamic positioning
    thrust allocation
    convex optimization
    constrained optimization
    DP simulator
    thrusters
    Opis:
    Vessels conducting dynamic positioning (DP) operations are usually equipped with thruster configurations that enable the generation of force and torque. Some thrusters in these configurations are deliberately redundant to minimize consequences of thruster failures, enable overactuated control and increase the safety in operation. On such vessels, a thrust allocation system must be used to distribute the control actions determined by the DP controller among the thrusters. The optimal allocation of the thrusters’ settings in DP systems is a problem that can be solved by convex optimization methods depending on the criteria and constraints used. This paper presents a quadratic programming (QP) method, adopted in a DP control model, which is being developed in Maritime University of Szczecin for ship simulation purposes.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 52 (124); 45-50
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Convex optimization of thrust allocation in a dynamic positioning simulation system
    Autorzy:
    Zalewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/135112.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    dynamic positioning
    thrust allocation
    convex optimization
    configurations
    programming
    simulator
    Opis:
    Vessels conducting dynamic positioning (DP) operations are usually equipped with thruster configurations that enable the generation of resultant force and moment in any direction. These configurations are deliberately redundant in order to reduce the consequences of thruster failures and increase the safety. On such vessels a thrust allocation system must be used to distribute the control actions determined by the DP controller among the thrusters. The optimal allocation of thrusters’ settings in DP systems is a problem that can be solved by several convex optimization methods depending on criteria and constraints used. The paper presents linear programming (LP) and quadratic programming (QP) methods adopted in the DP control model which is being developed at the Maritime University of Szczecin for ship simulation purposes.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 48 (120); 58-62
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remarks on the gluing algorithm for multibody systems co-simulation
    Autorzy:
    Tomulik, P.
    Frączek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/115845.pdf
    Data publikacji:
    2012
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    simulator coupling
    co-simulation
    waveform relaxation
    dynamic iteration
    multibody system dynamics
    Opis:
    This paper briefs a part of authors’ study on co-simulation techniques and their application to multibody system dynamics. The main concern of the study is on construction and properties of algorithms that are suitable for such purpose. One of the proposed methods from literature is so-called “gluing-algorithm” by Wang et al. These authors proposed Newton iteration to couple several simulators of mechanical subsystems through constraints/reactions, and provided numerical examples to suggest efficiency of the method. Here we re-investigate the method in order to underline some problems that one might meet when using the “gluingalgorithm”.
    Źródło:
    Challenges of Modern Technology; 2012, 3, 1; 19-32
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Postępowanie podczas wyposażania obiektów zabytkowych we włókiennicze wyroby wyposażenia wnętrz
    Autorzy:
    Małozięć, D.
    Koniuch, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/373730.pdf
    Data publikacji:
    2007
    Wydawca:
    Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
    Tematy:
    obiekt zabytkowy
    wyroby włókiennicze
    zagrożenie pożarowe
    bezpieczeństwo
    program FDS
    historic building
    textiles
    fire hazard
    safety
    Fire Dynamic Simulator program
    Opis:
    W niniejszym artykule przedstawiono efekt realizacji jednego z etapów projektu badawczego - Decyzja Nr 464/E-148/SPB/COST/KG/DWM 85/2005-2006 „Trudno zapalne wyroby włókiennicze ograniczające zagrożenie pożarowe w obiektach zabytkowych” w ramach Akcji COST C 17 „Built Heritage: Fire Loss to Historic Buildings”.
    This article contains result of a certain stage of research project - Decision Nr 464/E-148/SPB/COST/KG/DWM 85/2005-2006 “Non-flammable textile fabrics restrict fore hazard in building monuments” participating in Action COST C 17 „Built Heritage: Fire Loss to Historic Buildings”.
    Źródło:
    Bezpieczeństwo i Technika Pożarnicza; 2007, 3; 171-193
    1895-8443
    Pojawia się w:
    Bezpieczeństwo i Technika Pożarnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a Simulation Model for Controlling and Improving the Productivity of Batch Reactors
    Autorzy:
    Henini, G.
    Souahi, F.
    Laidani, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/779240.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    batch chemical reactor
    thermal control
    dynamic simulator
    mono-fluid
    heating and cooling system
    Opis:
    This paper describes the development of a dynamic simulator model for a jacketed batch reactor equipped with a mono-fluid heating/cooling system. The Mono-fluid flows at constant flow-rate through the jacketed reactor. The heating and cooling are assured respectively by electrical resistance and two plate heat exchangers. A detailed description of the equations leading to the development of simulation model is presented. The model is based on writing the equations of the mass balance and the heat balance for the reactor and the thermal loop in unsteady state. To validate the simulation model, we first studied the thermal behavior of the reaction mixture during heating and cooling, using water as the reaction mixture. We then considered the consecutive chemical reaction of the synthesis of cyclopentanediol from cyclopentadiene by studying the yield of this reaction. The results show that heating the reaction mixture increases significantly the yield of this synthesis reaction.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 1; 78-87
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Hot Deformation Parameters on the Size of Dynamically Recrystallized Austenite Grains of HSLA Steel
    Autorzy:
    Gnapowski, Sebastian
    Opiela, Marek
    Kalinowska-Ozgowicz, Elżbieta
    Szulżyk-Cieplak, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/102621.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    HSLA steel
    dynamic recrystallization
    austenite grain
    plastic strain
    Gleeble simulator
    stal HSLA
    dynamiczna rekrystalizacja
    ziarno austenitu
    odkształcenie plastyczne
    symulator Gleeble
    Opis:
    Materials scientists are seeking to produce metals with reduced weight and dimensions while maintaining the appropriate mechanical properties. There are several ways to improve the internal structure of metals, such as the ultrasound used to solidify liquid metal. The homogeneity of the grains and the uniformity of the metal structure affects its mechanical strength. This paper presents the results of investigations into the effects of hot deformation parameters in compression on the austenite grain size in the HSLA (High Strength Low Alloy) steel (0.16% C, 0.037% Nb, 0.004% Ti, 0.0098% N). The axisymmetric compression investigations were performed on cylindrical investigation specimens using a Gleeble 3800 thermomechanical simulator with the strain rate of 1÷15.9 s-1 and strain degree ε = 1.2. Before deformation, the research specimens were austenitized at TA = 1100÷1250 °C. The metallographic observations of the primary austenite grains were conducted with an optical microscope, while the structure of dynamically recrystallized austenite, inherited by martensite, was examined by using a scanning electron microscope.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 2; 76-84
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring and Identification of DP Operators Behavioural Traits and Common Errors During Simulator Training
    Autorzy:
    Bogachenko, Y.
    Pipchenko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841528.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Maritime Education and Training
    Dynamic Positioning
    simulator training
    Dynamic Positioning Operator
    IMO Guidelines
    Opis:
    The article presents factors influencing decision making by Dynamic Positioning Operator (DPO) and statistics of the DPOs behaviour in an emergency situation. Considering that supply operation is performed by a DP vessel at a distance comparable to its width of the hull to the installation, unit, or another vessel, the thruster failure may lead to a rapidly developing incident such as collision, pollution, or human injuries. Based on the IMO guidelines on formal safety assessment authors suggested a risk model of platform supply operation in dynamic positioning mode. It is shown that different approaches shall be applied for rule-making and active decision support applications. While rulemaking can be mainly based on retrospective incident-based data, decision support shall be developed on the basis of the dynamic state of the system. Therefore, it is necessary to understand the nature of the human element in the specific operation to build up proper technological and organizational barriers to prevent the forthcoming critical error.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 2; 337-342
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic modeling of the isoamyl acetate reactive distillation process
    Autorzy:
    Ali, S. S.
    Hossain, SK. S.
    Asif, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/778351.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    reactive distillation
    process simulator
    isoamyl acetate
    dynamic modeling
    disturbance
    Opis:
    The cost-effectiveness of reactive distillation (RD) processes makes them highly attractive for industrial applications. However, their preliminary design and subsequent scale-up and operation are challenging. Specifically, the response of RD system during fluctuations in process parameters is of paramount importance to ensure the stability of the whole process. As a result of carrying out simulations using Aspen Plus, it is shown that the RD process for isoamyl acetate production was much more economical than conventional reactor distillation configuration under optimized process conditions due to lower utilities consumption, higher conversion and smaller sizes of condenser and reboiler. Rigorous dynamic modeling of RD system was performed to evaluate its sensitivity to disturbances in critical process parameters; the product flow was quite sensitive to disturbances. Even more sensitive was product composition when the disturbance in heat duties of condenser or reboiler led to a temperature decrease. However, positive disturbance in alcohol feed is of particular concern, which clearly made the system unstable.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 1; 59-66
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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