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    Wyświetlanie 1-7 z 7
    Tytuł:
    Some comments on compositional analysis in management and production engineering
    Autorzy:
    Vives-Mestres, M.
    Martín-Fernández, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/406810.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    production composition
    log ratio analysis
    clr-biplot
    CoDa dendrogram
    ternary diagram
    simplex
    Opis:
    This paper introduces the most basic concepts of the compositional analysis of data with a simple but real example form the Management and Production Engineering (MPE) field. Compositional Data (CoDa) are vectors of positive elements that represent parts of a whole and are widely found in MPE, i.e. production times, resource composition, percentage utilization of work stands, waste components. . . The need for an analysis based on ratios of components (or better log-ratios of components) is illustrated step by step, and findings are compared to the corresponding standard methods applied to raw compositions. The paper also exposes the principles of CoDa analysis and presents two basic descriptive tools suitable for CoDa: the clr-biplot and the CoDa dendrogram. The example is a time series, from 1994 to 2013, of motor vehicle production in 8 countries and regions.
    Źródło:
    Management and Production Engineering Review; 2015, 6, 2; 63-72
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of a combined cycle power plant due to auxiliary heating from the combustion chamber of the gas turbine topping cycle
    Autorzy:
    Khan, Mohammad Nadeem
    Powiązania:
    https://bibliotekanauki.pl/articles/1845501.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pressure ratio
    air-fuel ratio
    supplement heating
    exergy analysis
    energy analysis
    Opis:
    Energy demand is increasing exponentially in the last decade. To meet such demand there is an urgent need to enhance the power generation capacity of the electrical power generation system worldwide. A combined-cycle gas turbines power plant is an alternative to replace the existing steam/gas electric power plants. The present study is an attempt to investigate the effect of different parameters to optimize the performance of the combined cycle power plant. The input physical parameters such as pressure ratio, air fuel ratio and a fraction of combustible product to heat recovery heat exchanger via gas turbine were varied to determine the work output, thermal efficiency, and exergy destruction. The result of the present study shows that for maximum work output, thermal efficiency as well as total exergy destruction, extraction of combustible gases from the passage of the combustion chamber and gas turbine for heat recovery steam generator is not favorable. Work output and thermal efficiency increase with an increase in pressure ratio and decrease in air fuel ratio but for minimum total exergy destruction, the pressure ratio should be minimum and air fuel ratio should be maximum.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 1; 147-162
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-camera system for measuring paper deformations based on image analysis
    Autorzy:
    Pełczyński, Paweł
    Szewczyk, Włodzimierz
    Bieńkowska, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1849045.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital image processing
    characteristic point tracking
    paper physical properties
    deformation analysis
    Poisson’s ratio
    Opis:
    The article presents a new technique for measuring paper deformation in unidirectional tensile tests, based on recording and analysis of a series of specimen images. The proposed technique differs from the DIC-based deformation measurement in that the cross-correlation of image data has been replaced with linear filtering. For this purpose, a regular grid of markers is printed on the sample. Filtering the image creates local maxima in the places where markers occur. The developed algorithm finds their location with sub-pixel accuracy. Printing a grid of markers on tested paper and use of reference objects visible in the same image as the paper sample, freed from the need to mechanically connect the camera and the universal testing machine and from the necessity to electronically synchronize their work. The obtained deformation distributions and Poisson’s ratios are in accordance with the literature data which confirms the correctness of the developed measurement technique.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 509-522
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-camera system for measuring paper deformations based on image analysis
    Autorzy:
    Pełczyński, Paweł
    Szewczyk, Włodzimierz
    Bieńkowska, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1849002.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital image processing
    characteristic point tracking
    paper physical properties
    deformation analysis
    Poisson’s ratio
    Opis:
    The article presents a new technique for measuring paper deformation in unidirectional tensile tests, based on recording and analysis of a series of specimen images. The proposed technique differs from the DIC-based deformation measurement in that the cross-correlation of image data has been replaced with linear filtering. For this purpose, a regular grid of markers is printed on the sample. Filtering the image creates local maxima in the places where markers occur. The developed algorithm finds their location with sub-pixel accuracy. Printing a grid of markers on tested paper and use of reference objects visible in the same image as the paper sample, freed from the need to mechanically connect the camera and the universal testing machine and from the necessity to electronically synchronize their work. The obtained deformation distributions and Poisson’s ratios are in accordance with the literature data which confirms the correctness of the developed measurement technique.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 509-522
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-camera system for measuring paper deformations based on image analysis
    Autorzy:
    Pełczyński, Paweł
    Szewczyk, Włodzimierz
    Bieńkowska, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1849104.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital image processing
    characteristic point tracking
    paper physical properties
    deformation analysis
    Poisson’s ratio
    Opis:
    The article presents a new technique for measuring paper deformation in unidirectional tensile tests, based on recording and analysis of a series of specimen images. The proposed technique differs from the DIC-based deformation measurement in that the cross-correlation of image data has been replaced with linear filtering. For this purpose, a regular grid of markers is printed on the sample. Filtering the image creates local maxima in the places where markers occur. The developed algorithm finds their location with sub-pixel accuracy. Printing a grid of markers on tested paper and use of reference objects visible in the same image as the paper sample, freed from the need to mechanically connect the camera and the universal testing machine and from the necessity to electronically synchronize their work. The obtained deformation distributions and Poisson’s ratios are in accordance with the literature data which confirms the correctness of the developed measurement technique.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 509-522
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Influence of Parameters of Micro-electrical Discharge Machining on Wear of Tool Electrode
    Autorzy:
    Puthumana, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/139636.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro-EDM
    tool wear ratio
    process inputs
    statistical methods
    main effects
    interactions
    regression analysis
    mikro-EDM
    wskaźnik zużycia narzędzia
    wejścia procesowe
    metody statystyczne
    efekty główne
    interakcje
    analiza metodą regresji
    Opis:
    To achieve better precision of features generated using the micro-electrical discharge machining (micro-EDM), there is a necessity to minimize the wear of the tool electrode, because a change in the dimensions of the electrode is reflected directly or indirectly on the feature. This paper presents a novel modeling and analysis approach of the tool wear in micro-EDM using a systematic statistical method exemplifying the influences of capacitance, feed rate and voltage on the tool wear ratio. The association between tool wear ratio and the input factors is comprehended by using main effect plots, interaction effects and regression analysis. A maximum variation of four-fold in the tool wear ratio have been observed which indicated that the tool wear ratio varies significantly over the trials. As the capacitance increases from 1 to 10 nF, the increase in tool wear ratio is by 33%. An increase in voltage as well as capacitance would lead to an increase in the number of charged particles, the number of collisions among them, which further enhances the transfer of the proportion of heat energy to the tool surface. Furthermore, to model the tool wear phenomenon, a regression relationship between tool wear ratio and the process inputs has been developed.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 2; 149-163
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Choosing a proper method for strengthening WPC beams with grooving method using SWARA-EDAS
    Autorzy:
    Chini, Mahdi
    Arefi Lale, Shahid
    Zolfani Hashemkhani, Sarfaraz
    Ustinovicius, Leonas
    Powiązania:
    https://bibliotekanauki.pl/articles/962280.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kompozyt drewno-polimer
    WPC
    odklejenie
    rowkowanie
    tworzywo sztuczne wzmocnione włóknem
    FRP
    analiza stopniowa
    współczynnik oceny masy
    SWARA
    odległość od średniej rozwiązania
    EDAS
    wood polymer composites
    debonding
    grooving
    fibre-reinforced plastic
    step-wise analysis
    weight assessment ratio
    distance from average solution
    Opis:
    Wood plastic composite (WPC) is a lightweight material, resistant against corrosion and damage, with recyclability of consuming materials. These materials usually used in marine structures frequently due to their unique features. In order to strengthen beams made by this material, usually Fibre-reinforced plastic (FRP) sheets are used, and one of the fracture modes in these beams is debonding of FRP sheet from the surface of the beams. To deal with this problem some grooves are used in the surface of the beam to improve the contact surface. The grooves include longitudinal, transverse and diagonal grooves. The main goal of this study is to assess different grooving methods in WPC-FRP beams. In this regard, primarily criteria (improving resistance, performance speed, performance complexity, performance costs, displacement and absorbing energy) were determined through interviews with experts in this field in order to assess the beams. Then, SWARA method employed to evaluate criteria with a policy based perspective and finally EDAS method applied for evaluating related alternatives. Based on obtained results, the longitudinal groove method is the best way of strengthening WPC beams to prevent debonding.
    Źródło:
    Archives of Civil Engineering; 2018, 64, 4/I; 161-174
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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