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    Wyświetlanie 1-8 z 8
    Tytuł:
    Steam turbine stage modernisation in front of the extraction point
    Autorzy:
    Szymaniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260514.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    turbine stages
    leakages
    extraction point
    axial flow turbines
    Opis:
    The paper presents modernisation of the steam turbine stage situated in front of the turbine extraction point, based on a 225 MW turbine LP stage as an example. The modernised design is intended to better control the steam flow in this area. In the presented design a special ring is used to drive the steam leakage flow directly to the heat exchanger. The performed experiments and numerical analyses confirmed measurable exploitation and efficiency advantages of the introduced modernisation. So far, it has been successfully applied in a number of turbines working in inland power plants, but its use can be easily extended, without need for further modification and without advantage loss, to marine turbines, especially those used as main propulsion in sea-going vessels.
    Źródło:
    Polish Maritime Research; 2018, 2; 116-122
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New approach to calculations of turbine stages and regeneration extraction points
    Autorzy:
    Szymaniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943248.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska
    Tematy:
    extension point
    regenerative chambers
    turbine stages
    leakages
    Opis:
    The article presents 200MW LP turbine stage calculations taking into account leakage flows over rotor blades in the regeneration extraction point area. A methodology is described which allows the user to shorten the time-consuming CFD calculations solving the Navier-Stokes equation system in the examined area. A two-stage procedure was applied in which two types of calculations were coupled together. The first type is a one-to-one passage calculation of a steam flow through the turbine stages in the vicinity of the extraction point. This type of calculations preserves the circumferential periodicity condition. The second type is a circumferentially non-symmetrical calculation of the flow through an inter-stage diffuser with an extraction chamber. The calculations were preformed using 3D CFD codes, FlowER and FLUENT, in the two above mentioned areas, respectively. The solution was found using an iterative procedure for these areas coupled by boundary conditions, until convergence of calculations was reached.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 209-215
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wizualizacja 3D struktury sztucznej sieci neuronowej z wykorzystaniem OpenGL
    3D visualization of structure of artificial neural network using OpenGL
    Autorzy:
    Pietrowski, W.
    Szymaniak, M
    Powiązania:
    https://bibliotekanauki.pl/articles/377413.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    grafika komputerowa
    OpenGL
    sztuczna sieć neuronowa
    Opis:
    W artykule przedstawiono oprogramowanie do trójwymiarowej wizualizacji struktury sztucznej sieci neuronowej. Takie oprogramowanie w procesie tworzenia sztucznej sieci neuronowej może posłużyć do wizualizacji wszystkich elementów struktury. Podgląd struktury sztucznej sieci neuronowej na etapie jej tworzenia ułatwia zarówno proces projektowania jak również jej modyfikowania. Powstałe oprogramowanie ma też walory dydaktyczne, które mogą zostać wykorzystane podczas zajęć omawiających sztuczne sieci neuronowe. Otrzymane rysunki mogą znaleźć zastosowanie w publikacjach opisujących zastosowania sztucznych sieci neuronowych w elektrotechnice jak i innych dziedzinach nauki.
    The article presents a software for three-dimensional visualization of structure of an artificial neural network. Such software in the creation of an artificial neural network can be used to visualize all the elements of the structure. Preview the structure of an artificial neural network on the stage of its creation facilitates both the design process as well as its modification. The resulting software is for the didactic, which can be used in the classroom discussing artificial neural networks. The resulting drawings can be used in publications describing the use of artificial neural networks in electrical engineering and other sciences.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 137-144
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modernisation of steam turbine construction at regenerative steam extraction point
    Autorzy:
    Szymaniak, M.
    Gardzilewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955313.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Gdańska
    Tematy:
    modernization
    turbine stage
    extraction point
    leakage
    Opis:
    The paper presents a methodology which has led to improvement of the turbine stage performance in the regenerative steam extraction chamber area by introducing a ring which collects the leakage flow from the gaps over unshrouded rotor blade tips and directs it to the extraction chamber. A comparison is made between the results obtained for the initial design (without a ring) and the design with the ring mounted. The results obtained for the construction were calibrated using the data measured on a real turbine in a Polish power plant.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 4; 319-327
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady flow through the gap of savonius turbine rotor
    Autorzy:
    Świrydczuk, J.
    Doerffer, P.
    Szymaniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1934037.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska
    Tematy:
    Savonius turbine
    rotor gap
    vortices
    Opis:
    The paper presents a numerical analysis of unsteady flow through the gap of a Savonius turbine rotor, performed for varying integral turbine operating parameters calculated for the case under study as well as obtained from experiments described in the literature. Changes in the unsteady flow pattern, including the development and interaction of numerous vortex structures in the vicinity of the gap, and their relevance to the varying integral parameters are discussed. We conclude that the structure responsible for the intensity of the flow through the gap is a vortex which forms in the vicinity of the gap at certain phases of rotor revolution, and that a possible way to improve the efficiency of operation of a Savonius turbine is to control the intensity of this vortex by modifying the shape of the blade edges in the vicinity of the gap.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2011, 15, 1; 59-70
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish aspects in the modern design solutions of steam turbine flow systems
    Autorzy:
    Gardzilewicz, A.
    Obrzut, D.
    Szymaniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259290.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    steam turbine
    power cycles
    flow systems
    efficiency
    errosion
    Opis:
    This paper presents new solutions of turbine stages which have been applied to high-power steam turbine flow systems. The structures, elaborated in Poland, were designed with the use of the authors’ original computational software and verified by measurements performed on real turbine sets.
    Źródło:
    Polish Maritime Research; 2009, S 1; 14-21
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of energy and emission indicators of a piston engine supplied by a mixture of biogas
    Autorzy:
    Stępniak, D.
    Surwiło, J.
    Lampart, P.
    Szymaniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175362.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    piston combustion engine
    low caloric fuels
    biogas
    CO
    CO₂
    NOx emission
    Opis:
    The paper presents the methodology and results of research focused on experimental investigation of combustion of biogas fuels in a combustion piston engine. The study highlights the variability of exhaust gases parameters produced by the engine running in an idle mode and in a generation mode. The experimental analysis includes research about variability of temperature in the cylinders, depending on the composition of fuel used to supply the engine. The qualitative and quantitative analysis of exhaust gases extends on biogas substitutes with different proportions of CH₄ and CO₂. Characteristics of a piston combustion engine were created, including CO, CO₂, NOx emission indicators, for a range of engine load and fuel composition.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 109-120
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GMDSS - system for operational work OE_GMDSS in Polish Rescue Radio
    Autorzy:
    Wilczek, M.
    Szymaniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1833873.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    monitoring system
    safety at sea
    GMDSS
    system monitoringu
    bezpieczeństwo na morzu
    Opis:
    Officially, at the end of 2019, a correction of the Baltic Sea Location was published in the Sailing News, which at the same time informed about the change of the operator of the Polish GMDSS Responsibility Zone, excluding Witowo Radio so far and transferring the Polish Rescue Radio (SPL) service. Starting from 2020. PSL began operational service of GMDSS in Poland. This article is the first presentation of the experience from the implementation of this project “Construction of maritime communication system in danger, GMDSS-PL”. mainly focusing on the OpenEye_ GMDSS operating system. In addition to the technological layer of the project, the procedural and organizational part of the GMDSS service has been equally important. The maritime emergency response system can be compared to the operation of 112 on land. The operation and efficiency of this system directly translates into human health and life as well as the quality of the marine environment around us. The technical means provide a high quality and certainty of business continuity. Communication in danger is one of the basic and most important tasks of the Polish maritime service. At this point, all operators and GMDSS services in the Maritime Office in Gdynia and Szczecin deserve praise.
    Źródło:
    Archives of Transport System Telematics; 2020, 13, 1; 43--48
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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