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    Wyświetlanie 1-5 z 5
    Tytuł:
    Technical state assessment of charge exchange system of self-ignition engine, based on the exhaust gas composition testing
    Autorzy:
    Rudnicki, J.
    Zadrąg, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/258598.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    diagnostic model
    self-ignition engine
    exhaust gas components
    artificial neural networks
    Opis:
    This paper presents possible use of results of exhaust gas composition testing of self - ignition engine for technical state assessment of its charge exchange system under assumption that there is strong correlation between considered structure parameters and output signals in the form of concentration of toxic compounds (ZT) as well as unambiguous character of their changes. Concentration of the analyzed ZT may be hence considered to be symptoms of engine technical state. At given values of the signals and their estimates it is also possible to determine values of residues which may indicate a type of failure. Available tool programs aimed at analysis of experimental data commonly make use of multiple regression model which allows to investigate effects and interaction between model input quantities and one output variable. Application of multi-equation models provides great freedom during analysis of measurement data as it makes it possible to simultaneously analyze effects and interaction of many output variables. It may be also implemented as a tool for preparation of experimental material for other advanced diagnostic tools such as neural networks which , in contrast to multi-equation models, make it possible to recognize a state at multistate classification and - in consequence – to do diagnostic inference. Here , these authors present merits of application of the above mentioned analytical tools on the example of tests conducted on an experimental engine test stand.
    Źródło:
    Polish Maritime Research; 2017, S 1; 203-212
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems of modelling toxic compounds emitted by a marine internal combustion engine for the evaluation of its structure parameters
    Problemy modelowania emisji związków toksycznych okrętowego silnika spalinowego dla oceny jego parametrów struktury
    Autorzy:
    Rudnicki, J.
    Zadrąg, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/134191.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    engine exhaust components
    marine engines
    engine diagnostics
    składniki spalin silnika
    silniki okrętowe
    diagnostyka silników
    Opis:
    The paper presents the possibility of using an analytical study of the engine exhaust ignition to evaluate the technical condition of the selected components. Software tools available for the analysis of experimental data commonly use multiple regression model that allows the study of the effects and iterations between model input quantities and one output variable. The use of multi-equation models gives a lot of freedom in the analysis of the measurement results, as it allows the simultaneous analysis of multiple effects and iterations of output variables. It can also be used as a tool for the preparation of experimental material for other advanced diagnostic tools, such as models using neural networks, which allow, in contrast to multi-equation models, the recognition of the state with the number of classes of more than two-class, thus enabling diagnostic reasoning. Assuming that there is a strong correlation and unambiguous nature of the changes in the concentrations of toxic compounds analyzed in the course of the experiment can be seen as symptoms of the technical condition of the engine and with the known values of the output signals (including concentrations of toxic compounds) and their estimates, the values of residuals can be determined, which may indicate the type of damage. The authors show the advantages of using these analytical tools on the example of research conducted on the engine test bench.
    W artykule przedstawiono możliwość wykorzystania wyników badań składu spalin silnika z zapłonem samoczynnym do oceny stanu technicznego jego wybranych podzespołów. Dostępne programy narzędziowe służące do analizy danych eksperymentalnych powszechnie wykorzystują model regresji wielokrotnej, który umożliwia badanie efektów i interacji pomiędzy wielkościami wejściowymi modelu a jedną zmienną wyjściową. Zastosowanie modeli wielorównaniowych daje wiele możliwości podczas analizy wyników pomiarowych, gdyż umożliwia jednoczesną analizę efektów i interacji wielu zmiennych wyjściowych. Może być również wykorzystywane jako narzędzie do przygotowania materiału doświadczalnego dla innych zaawansowanych narzędzi diagnostycznych, takich jak modele wykorzystujące sieci neuronowe, które pozwalają, w przeciwieństwie do modeli wielorównaniowych, na rozpoznanie stanu przy liczbie klas większej niż dwuklasowa, umożliwiając tym samym wnioskowanie diagnostyczne. Przy założeniu bowiem, że istnieje silna korelacja oraz jednoznaczny charakter zmian stężeń analizowanych związków toksycznych w trakcie prowadzonego eksperymentu można traktować jako symptomy stanu technicznego silnika a przy znanych wartościach sygnałów wyjściowych (między innymi stężeń związków toksycznych) oraz ich estymat można wyznaczyć wartości residuów, które mogą wskazywać na rodzaj uszkodzenia. Autorzy w pracy przedstawiają zalety stosowania powyższych narzędzi analitycznych na przykładzie badań przeprowadzonych na stanowisku silnika badawczego.
    Źródło:
    Combustion Engines; 2015, 54, 3; 432-441
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems of modelling toxic compounds emitted by a marine internal combustion engine in unsteady states
    Autorzy:
    Rudnicki, J.
    Zadrąg, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/259322.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    technical diagnostics
    diesel engine
    dynamic processes
    neural network
    Opis:
    Contemporary engine tests are performed based on the theory of experiment. The available versions of programmes used for analysing experimental data make frequent use of the multiple regression model, which enables examining effects and interactions between input model parameters and a single output variable. The use of multi-equation models provides more freedom in analysing the measured results, as those models enable simultaneous analysis of effects and interactions between many output variables. They can also be used as a tool in preparing experimental material for other advanced diagnostic tools, such as the models making use of neural networks which, when properly prepared, enable also analysing measurement results recorded during dynamic processes. The article presents advantages of the use of the abovementioned analytical tools and a sample application of the neural model developed based on the results of examination carried out on the engine research rig.
    Źródło:
    Polish Maritime Research; 2014, 4; 57-65
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laboratory station for research of the innovative dry method of exhaust gas desulfurization for an engine powered with residual fuel
    Autorzy:
    Korczewski, Z.
    Rudnicki, J.
    Zadrąg, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/132848.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    compression-ignition engine
    desulfurization of exhaust gas
    dry method
    silnik o zapłonie samoczynnym
    odsiarczanie spalin
    metoda sucha
    Opis:
    Development of technology for exhaust gas desulfurization in marine engines using the dry method is, nowadays, a priority due to the calendar of introducing restrictions by the Directive of the European Parliament and of the Council 2012/33/EU of 21 November 2012. According to this directive, starting from 1 January 2015, inside the SECA (Sulphur Emission Control Area) the maximum sulfur content of marine fuels used on territorial seas is 0.1% per weight unit. But at the same time the directive allows for the use of exhaust gas desulfurization plant operating in a closed system. The ship equipped with the system will be able to use fuels with a high sulfur content, which will then be removed from the exhaust gas through an applied adsorber, and the reacted adsorbent is received by specialized services stationed in harbors. The International Maritime Organization has set a limit value of the emissions of sulfur oxides in exhaust gases of marine engines at 6 g/kWh (International Convention for the Prevention of Sea Pollution from Ships MARPOL 73/78 Annex VI, Regulation 14). Contemporary methods of exhaust gas desulfurization in marine engines are all expensive methods (4-5 million euro). This is, among other reasons, due to the limited market audience, but primarily due to the monopolized position of manufacturers offering fabrication and assembly of this type of marine ship installations. Proposed as part of a research project financed by the Regional Fund for Environmental Protection and Maritime Economy in Gdansk, the dry method (adsorption) reducing SOx emissions in exhaust gases of marine engines, is an alternative, and a definitely cheaper and therefore competitive solution, compared to the wet methods (absorption), which are currently the most widely used in marine scrubber installations. Importantly, as confirmed by the results of the study, the proposed dry method, in addition to the effective reduction of sulfur oxides, also reduces emissions of nitrogen oxides and carbon monoxide. The paper presents the configuration and measurement capabilities of the test station built under the project, as well as the representative results of the investigations so far. During the exhaust gas desulfurization test a sodium adsorbent (sodium bicarbonate) and its modifications were used in the process of mechanical, chemical, and thermal activation. Two physicochemical processes were studied during the development of the method: of adsorbent’s reaction on the chemical emission of the exhaust gas – the effectiveness of SOx and NOx compound removal, with various structural solutions in the process reactor, the impact of the adsorber on the emission source of sulfur oxides, that is, on the compression-ignition engine. Therefore, one of the priorities of the project, with a utilitarian significance, was to determine the impact of the inclusion of the desulfurization installation in the exhaust gas system on the energy ratios of the engine.
    Źródło:
    Combustion Engines; 2017, 56, 1; 32-37
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of oxygenated diesel-n-butanol fuel blends on combustion, performance, and exhaust emissions of a turbocharged crdi diesel engine
    Autorzy:
    Labeckas, G.
    Slavinskas, S.
    Rudnicki, J.
    Zadrąg, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/259929.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    diesel engine
    diesel-n-butanol blends
    combustion phenomenon
    performance efficiency
    smoke
    pollutant emissions
    Opis:
    The article deals with the effects made by using various n-butanol-diesel fuel blends on the combustion history, engine performance and exhaust emissions of a turbocharged four-stroke, four-cylinder, CRDI 1154HP (85 kW) diesel engine. At first, load characteristics were taken when running an engine with normal diesel fuel (DF) to have ‘baseline’ parameters at the two ranges of speed of 1800 and 2500 rpm. Four a fossil diesel (class 1) and normal butanol (n-butanol) fuel blends possessing 1 wt%, 2 wt%, 3 wt%, and 4 wt% (by mass) of n-butanol-bound oxygen fractions were prepared by pouring 4.65 wt% (BD1), 9.30 wt% (BD2), 13.95 wt% (BD3), and 18.65 wt% (BD4) n-butanol to diesel fuel. Then, load characteristics were taken when an engine with n-butanol-oxygenated fuel blends at the same speeds. Analysis of the changes occurred in the autoignition delay, combustion history, the cycle-to-cycle variation, engine efficiency, smoke, and exhaust emissions NOx, CO, THC obtained with purposely designed fuel blends was performed on comparative bases with the corresponding values measured with ‘baseline’ diesel fuel to reveal the potential developing trends.
    Źródło:
    Polish Maritime Research; 2018, 1; 108-120
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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