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    Wyświetlanie 1-4 z 4
    Tytuł:
    Application of multiple moving approximation with polynomials in curve smoothing
    Autorzy:
    Pawletko, R.
    Polanowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/246390.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    multiple moving least-square approximation
    decomposition and separation of disturbances
    Opis:
    The paper has characterized the method of multiple moving least-square approximation with polynomials, known as the Savitzky-Golay filter. This method enables smoothing the measurement series, decomposition and separation of disturbances, generation of derivatives as well as approximate integration of measurement series. The smoothing properties of the method as well as the possibilities of separation and decomposition of disturbances are shown on the examples of treatment of the selected indicator graph. The attention was paid to the need for additional application of special filters in case of abnormal impulse deviations. The examples show that in case of the analyzed curve, the results of smoothing by means of several wave filters from Wavelet Explorer package, are worse than those received with the methods of moving approximation. On the derivatives of smoothened curve by means of wavelet filters, there are significant oscillations, what is typical of the whole-interval approximation with spline functions. One should highlight the high simplicity of algorithms of multiple moving approximation and associated with this, high speed of operation, what particularly predisposes this method of data processing in an on-line mode. The authors presented their own proposals of programs for measurement data processing with the method of multiple moving approximation with polynomials, with the possibility of selection of an approximation polynomial to the fifth degree. The programs were developed in the Excel and Delphi environment.
    Źródło:
    Journal of KONES; 2010, 17, 2; 395-401
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of movable approximation and wavelet decomposition to smoothing-out procedure of ship engine indicator diagrams
    Autorzy:
    Polanowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/260419.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    smoothing-out the runs
    least squares method
    full-interval approximation
    movable approximation
    decomposition of disturbances
    cut constraints
    glued constraints
    riveted constraints
    broken constraints
    weighting factors
    wavelet decomposition
    Opis:
    In this paper - on the basis of indicator diagram processing taken as an example - were shown possibilities of the smoothing-out and decomposing of run disturbances with the use of the movable multiple approximation based on the least squares criterion. The notion was defined of movable approximating object and constraints used to form approximation features. It was demonstrated that the multiple approximation can be used to decompose disturbances out of an analyzed run. The obtained smoothing-out results were compared with those obtained from full-interval approximation of runs by means of splines as well as wavelet decomposition with using various wavelets, Wavelet Explorer and Mathematica software. Smoothing-out quality was assessed by comparing runs of first derivatives which play crucial role in the advanced processing of indicator diagrams.
    Źródło:
    Polish Maritime Research; 2007, 2; 12-17
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of diagnostic utility of instantaneous angular speed fluctuation of diesel engine crankshaft
    Autorzy:
    Dereszewski, M.
    Charchalis, A.
    Polanowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/244646.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    two-stroke diesel engine diagnostics
    diagnostics of combustion process
    angular speed variation
    angular acceleration
    moving approximation
    Opis:
    Frequent crew rotation, a shorthand, and various levels of technical crew skills, are the facts with the ship-owners has to cope very often. Having the proper level of engine exploitation as a main objective is necessary to implement a constant engine monitoring system, in order to obtain quick and reliable diagnostic information. One cannot omit the financial aspect of monitoring system implementation, created by its price and costs of service. In this paper, the analysis of diagnostic utility of the signal deriving from a propulsion shaft fluctuation during its one revolution is presented. The angular speed of the shaft was measured using a laser sensor of torque meter ETNP-10. Diagnostic utility validation has been verified on a basis of combustion quality, in cylinders of two-stroke, turbocharged Marine Diesel Engine. Test was carried out on board of a container vessel during its sea passage. In order to evaluate the effectiveness of the method, the crew simulated engine’s malfunction by fuel injection cut-off in various cylinders (only one in the same time).The interference signals decomposition was carried out using the method of synchronous averaging and moving approximation with polynomial of 3rd exponent.
    Źródło:
    Journal of KONES; 2011, 18, 1; 123-128
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aproksymacja tablic molowego ciepła właściwego powietrza suchego dla zakresu sprężania
    Approximation of the tables of the air molar specific heat of the dry air in the range of compression
    Autorzy:
    Polanowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/133383.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    przybliżenie tablic wzorami
    ciepło właściwe powietrza suchego
    specific heat of dry air
    table approximation by formula
    Opis:
    W referacie przedstawiono metody wyłonienia modeli aproksymujących dwuwymiarowe tablice termodynamiczne Lemmona ciepła właściwego powietrza w zakresie temperatur 300–2000 K i ciśnień 0,101325–20 MPa. Rozpatrzono dwuwymiarowe modele wielomianowe oraz kombinacje liniowe wielomianów i innych funkcji elementarnych, stosując metodę najmniejszych kwadratów oraz minimalizację maksymalnych odchyleń. Najskuteczniejszym okazał się model bazujący na aproksymacji warstwicowej dla p = idem i T = idem z zastosowaniem członów mających charakter poprawek wirialnych. Opracowane wzory umożliwiają obliczanie wartości molowego ciepła właściwego przy stałym ciśnieniu i stałej objętości w podanych wyżej przedziałach ciśnień i temperatur z błędami nie większymi od 0,083% wartości tablicowej.
    The paper presents a methods for identifying models approximating two-dimensional Lemmon thermodynamic tables of the molar specific heat of the air in the temperature range 300 to 2000 K and pressures 0.101325 to 20 MPa. Generally for this purpose was used the method of least squares and minimization of the maximum deviations. Considered models are linear combinations of basic functions. There are considered two-dimensional polynomials complete and incomplete higher degrees and combinations of any of basic functions. Also there is analyzed a model based on the approximation of the contour lines for p = idem and T = idem. This allowed to emerge basis functions corresponding to the nature of the approximated data. The elaborated formulas allow calculation of the specific heat at constant pressure and at constant volume value in the above ranges of pressures and temperatures with errors of no more than 0.083% of the table values.
    Źródło:
    Combustion Engines; 2015, 54, 3; 582-586
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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