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    Wyświetlanie 1-4 z 4
    Tytuł:
    Choice of rational diameters of pipelines for hydraulic system of city quarter water
    Vybor racionalnykh diametrov truboprovodov gidravlicheskojj sistemy vodosnabzhenija gorodskogo kvartala
    Autorzy:
    Akimov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/793305.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    mathematical model
    hydraulic characteristics
    water supply system
    rational parameter
    pipeline
    pipe diameter
    integration
    economic effect
    water consumption
    city area
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of MLP and RBF Neural Networks in the Task of Classifying the Diameters of Water Pipes
    Autorzy:
    Gvishiani, Zurab
    Dawidowicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2174907.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    water distribution system
    hydraulic calculation
    selection of diameter
    water pipe
    artificial neural network
    radial basis function
    multilayer perceptron
    Opis:
    Hydraulic calculations of water distribution systems are currently performed using computer programs. In addition to the basic calculation procedure, modules responsible for evaluating the obtained calculation results are introduced more and more often into the programs. This article presents the results of research on artificial neural networks with a radial base function (RBF) and a multilayer perceptron (MLP), aimed at determining whether they can be used to model the relationship between the variables describing the computational section of the water distribution system and the diameter of the water pipe. The classification capabilities of the RBF and MLP networks were analyzed according to the number of neurons in the hidden layer of the network. A comparative analysis of RBF networks with multilayer perceptron (MLP) networks was performed. The results showed that the MLP networks have much better classification properties and are better suited for the task of assessing the selected diameters of the water pipes.
    Źródło:
    Rocznik Ochrona Środowiska; 2022, 24; 505--519
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization model the pipe diameter in the drinking water distribution network using multi-objective genetic algorithm
    Autorzy:
    Sulianto, -
    Setiono, Ernawan
    Yasa, I. Wayan
    Powiązania:
    https://bibliotekanauki.pl/articles/1844381.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    diameter
    genetic algorithm
    network
    Newton Raphson method
    optimum
    pipe
    Opis:
    Under conditions of gravity flow, the performance of a distribution pipe network for drinking water supply can be measured by investment cost and the difference in real and target pressures at each node to ensure fairness of the service. Therefore, the objective function for the optimization in the design of a complex gravity flow pipe network is a multi-purpose equation system set up to minimize the above-mentioned two parameters. This article presents a new model as an alternative solution to solving the optimization equation system by combining the Newton–Raphson and genetic algorithm (GA) methods into a single unit so that the resulting model can work effectively. The Newton–Raphson method is used to solve the hydraulic equation system in pipelines and the GA is used to find the optimal pipe diameter combination in a network. Among application models in a complex pipe network consisting of 12 elements and 10 nodes, this model is able to show satisfactory performance. Considering variations in the value of the weighting factor in the objective function, opti-mal conditions can be achieved at the investment cost factor (ω1) = 0.75 and the relative energy equalization factor at the service node (ω2) = 0.25. With relevant GA input parameters, optimal conditions are achieved at the best fitness value of 1.016 which is equivalent to the investment cost of USD 56.67 thous. with an average relative energy deviation of 1.925 m.
    Źródło:
    Journal of Water and Land Development; 2021, 48; 55-64
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation analysis of the effect of inlet pipe diameter on the cylinder filling of compression-ignition engine
    Autorzy:
    Lisowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/247788.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    inlet pipe diameter
    in-cylinder mass
    numerical model
    inlet system
    simulation
    combustion engines
    Opis:
    In this paper are presented the basic problems accompanying the flow of charge through compression-ignition engine inlet system. The flow of medium through inlet pipe to cylinder was assumed to be one-dimensional and described with mass, momentum and angular momentum conservation eąuations and energy consLrvation law. On the other hand, a zero-dimensional model described by mass-energy conservation equations was used to determine parameters of the medium in total cylinder volume. Simulations were carried out with the use of numerical programme in which McCormack's explicit method was applied to solve differential equations describing the flow of charge in inlet system. The McCormack explicit technique was used due to the fact that an earlier attempt at solving a numerical problem with the method of lines had not yielded desired effects in view of high instability. Simulation aimed at determining the mass of air remaining in engine cylinder after inlet valve closure. Simulation results are presented in the form of in-cylinder air mass versus crank angle characteristics for different inlet pipe diameters. The study results are also presented in the form of a summary table and a summary diagram, the latter enabling a comparison of results for different inlet pipe diameters.
    Źródło:
    Journal of KONES; 2010, 17, 4; 295-302
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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