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    Wyświetlanie 1-5 z 5
    Tytuł:
    Parametric functions of ship propulsion engine operation
    Autorzy:
    Roslanowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/247696.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transformation of energy
    operation of engine
    dimensional space
    dimensional functions
    Opis:
    The following article presents the method of determining the ship 's propulsion engine operation basing on the engines work parameters by means of dimensional analysis. The operation of engine is considered as effective energy transfer to ship propeller in the form of work during its operation. According to Girtler engine operation can be considered as, a new physical quantity of dimension Joul multiplied by second [2, 3J. A random type of combustion in engine cylinders makes possible to deal with engine operation as a random variable vectors in the Hilbert space isomorphic with dimension space. The analysis of stochastic engine workprocess is alternatively used as a set of determinist time functions by means dimension analysis. Parametric functions of engine work were determined on the basis of algebraic analysis scheme designed by S. Drobot. This scheme makes possible to control the correctness of conclusion rules regarding mathematics in digital functions describing operation of ship propulsion engine. Additionally the parametric form of function makes possible to investigate the influence of function parameters on correctness of engine operation. It makes possible to forecast the engine operation i given sailing conditions and to estimate steerability of ship during the voyage. It improves the safety of ship operation propelled by single engine propulsion plant.
    Źródło:
    Journal of KONES; 2010, 17, 4; 407-413
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of ship propeller torsional vibrations
    Autorzy:
    Rosłanowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/242958.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transformation of energy
    operation of engine
    dimensional space
    dimensional functions
    Opis:
    The article presents identification methods of ship propeller torsional vibrations in dimensional space and ways for their dumping. Propeller torsional vibrations are caused by static, dynamic and hydrodynamic unbalance of propeller itself and its operation in non-uniform velocity field of ship hull. The propeller working in uneven velocity field of the hull creates cyclic thrust forces, peripheral vibrations of shaft as well as flexural and torsional load of propeller shaft. Vibrations cause additional thrust load on shaft bearings and shaft bending moment. Vibrations of ship hull, particularly its stern section cause variation of pressure field created by propeller. Amplitude of particular parts of the hull comes from the action of cyclic forces created by working ship propeller. They can be very large. Therefore, the ways to reduce vibrations caused by running propeller are very important. Given in the article methods of vibration dumping calculations conduct to determination of vibration dumping coefficients. Calculation results are comparable to measuring results in spite of fact they were determined under assumption of different velocity fields of water flowing through propeller circle. Amplitudes of vibrations depend on number of propeller blades and pulsate with the basic frequency equal to product of the rotational speed and number of blades. Causes of such vibrations and additional load of vessel stern are described in the article. An attention was paid to assure the greatest possible uniformity of velocity field by adequate design of stern shape and accessories. The ways to reduce torsional vibrations of propeller by the appropriate selection of blades number and their accurately machining are also given in the article.
    Źródło:
    Journal of KONES; 2015, 22, 2; 177-184
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of nondimensional arguments in dimensional functions of ship propulsion engine operation
    Autorzy:
    Rosłanowski, J.
    Charchalis, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246528.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    ship propulsion engine operation dimensional analysis
    dimensionless arguments in dimensional functions
    Opis:
    The following article describes different ways for determining dimensionless arguments in dimensional functions of ship propulsion engine operation. Dimensional space has also been characterized in relation to properties it possesses. An attention has been paid to the fact that it creates Abelian group, where involution fulfils multiplication axiom by scalar, and positive numbers that belong to dimensional space create dimensionless subspace. The conception of dimensional dependence has also been explained. There are also described conditions, which should be fulfilled by dimensional quantities to be dimensionally independent. Fundamental theorems of dimensional analysis have also been characterized. There is also given the definition of dimensional function of ship propulsion engine operation concerning values and dimensional arguments. It has been explained what requirements are to be fulfilled. One can also learn what limitations are imposed on dimensional function of ship propulsion engine operation concerning dimensional homogeneity and invariance. The ways of dimensional function transformation into a numerical one have been described. In addition, some conditions have been given which must be applied at given method of dimensional function transformation. An attention has been paid to the fact that dimensionless arguments are similarity invariant as a result of transformation by the similarity method of mathematical model of ship propulsion engine operation. In this study, the ship propulsion engine performance is expressed by product of Joule and second interpreted as transfer of energy in the form of work. Identification of ship propulsion engine operation by dimensional analysis performed in terms of its usefulness for diagnosis of ship propulsion engines. The basic problem of marine diesel exploitation is the monitoring of its technical condition. Diagnosis of marine diesel propulsion increases the safety of the ship and thus protects the marine environment against pollution.
    Źródło:
    Journal of KONES; 2015, 22, 2; 185-190
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Motion Planning, Equivalence, Infinite Dimensional Systems
    Autorzy:
    Rouchon, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/908322.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    metoda elementów skończonych
    układ sterowania
    system opóźniania
    infinite dimensional control systems
    motion planning
    flatness
    absolute equivalence
    Pfaffian systems
    delay systems
    Gevrey functions
    Opis:
    Motion planning, i.e., steering a system from one state to another, is a basic question in automatic control. For a certain class of systems described by ordinary differential equations and called flat systems (Fliess et al., 1995; 1999a), motion planning admits simple and explicit solutions. This stems from an explicit description of the trajectories by an arbitrary time function y, the flat output, and a finite number of its time derivatives. Such explicit descriptions are related to old problems on Monge equations and equivalence investigated by Hilbert and Cartan. The study of several examples (the car with n-trailers and the non-holonomic snake, pendulums in series and the heavy chain, the heat equation and the Euler-Bernoulli flexible beam) indicates that the notion of flatness and its underlying explicit description can be extended to infinite-dimensional systems. As in the finite-dimensional case, this property yields simple motion planning algorithms via operators of compact support. For the non-holonomic snake, such operators involve non-linear delays. For the heavy chain, they are defined via distributed delays. For heat and Euler-Bernoulli systems, their supports are reduced to a point and their definition domain coincides with the set of Gevrey functions of order 2.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2001, 11, 1; 165-188
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Robust Logistic Regression Specification for Classification of Multi‑dimensional Functional Data in Presence of Outlier
    Zastosowanie odpornej regresji logistycznej do klasyfikacji wielowymiarowych danych funkcjonalnych
    Autorzy:
    Krzyśko, Mirosław
    Smaga, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/657746.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    analiza regresji dla danych funkcjonalnych
    estymacja odporna
    model regresji logistycznej
    rozwinięcie funkcji w bazie funkcyjnej
    wielowymiarowe dane funkcjonalne
    zagadnienie klasyfikacji
    basis functions representation
    classification problem
    functional regression analysis
    logistic regression model
    multi‑dimensional functional data
    robust estimation
    Opis:
    W niniejszym artykule rozważany jest problem dwuetykietowej klasyfikacji wielowymiarowych danych funkcjonalnych. Zaproponowane rozwiązanie tego problemu oparto na technikach regresyjnych i modelu regresji logistycznej dla danych funkcjonalnych. Model ten został przekształcony do szczególnego modelu regresji logistycznej za pomocą rozwinięcia (będących funkcjami) współczynników regresji i zmiennych objaśniających w bazie funkcyjnej. Na podstawie tego modelu skonstruowana została reguła klasyfikacyjna. W przypadku występowania obserwacji odstających rozważane są również metody odpornej estymacji nieznanych parametrów. Eksperymenty numeryczne sugerują, że proponowane metody mogą z powodzeniem być wykorzystane w praktycznych zagadnieniach.
    In this paper, the binary classification problem of multi‑dimensional functional data is considered. To solve this problem a regression technique based on functional logistic regression model is used. This model is re‑expressed as a particular logistic regression model by using the basis expansions of functional coefficients and explanatory variables. Based on re‑expressed model, a classification rule is proposed. To handle with outlying observations, robust methods of estimation of unknown parameters are also considered. Numerical experiments suggest that the proposed methods may behave satisfactory in practice.
    Źródło:
    Acta Universitatis Lodziensis. Folia Oeconomica; 2018, 2, 334
    0208-6018
    2353-7663
    Pojawia się w:
    Acta Universitatis Lodziensis. Folia Oeconomica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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