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    Wyświetlanie 1-3 z 3
    Tytuł:
    Semi-Markov approach for reliability modelling of light utility vehicles
    Autorzy:
    Oszczypała, Mateusz
    Ziółkowski, Jarosław
    Małachowski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/24200838.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    semi-Markov model
    reliability modelling
    readiness
    maintenance analysis
    transportation system
    Opis:
    Vehicles are important elements of military transport systems. Semi-Markov processes, owing to the generic assumption form, are a useful tool for modelling the operation process of numerous technical objects and systems. The suggested approach is an extension of existing stochastic methods employed for a wide spectrum of technical objects; however, research on light utility vehicles complements the subject gap in the scientific literature. This research paper discusses the 3-state semi-Markov model implemented for the purposes of developing reliability analyses. Based on an empirical course of the operation process, the model was validated in terms of determining the conditional probabilities of interstate transitions for an embedded Markov chain, as well as parameters of time distribution functions. The Laplace transform was used to determine the reliability function, the failure probability density function, the failure intensity, and the expected time to failure. The readiness index values were calculated on ergodic probabilities.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 2; art. no. 161859
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of options to meet transport needs using the MAJA multi-criteria method
    Autorzy:
    Małachowski, Jerzy
    Ziółkowski, Jarosław
    Oszczypała, Mateusz
    Szkutnik-Rogoż, Joanna
    Lęgas, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/1833620.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transport
    multi-criteria method
    transport costs
    optimization
    decision problem
    metoda wielokryterialna
    koszty transportu
    optymalizacja
    problem decyzyjny
    Opis:
    The problem of choosing the way to move people is often encountered both in scientific research and in everyday life. The difficulty of this process depends on the availability of many variants and the pursuit of satisfying transport needs at the minimum cost, in the shortest possible time and in the most comfortable conditions. The publication presents a decision problem of choosing the best transport option using multi-criteria methods. At the beginning authors presented the widely used methods of solving decision problems in the literature. Subsequently, based on the example of the Warsaw-Wroclaw connection, the MAJA multi-criteria assessment method algorithm was analysed. Both road, rail and air transport options were considered. Six possible variants of solutions were indicated, which were assessed in three sub-criteria: cost, time and comfort of travel. Then, the results of the analysis were compared with the results obtained using other multi-criteria decision-making support methods, i.e. ELECTRE I, AHP, TOPSIS, PROMETHEE, SAW, PVM. The considered methods were divided according to the way the result was presented, as a result of which the methods based on the relation of superiority (which included the MAJA method) and methods using ranking were distinguished, and then an intra-group comparison was made. On the basis of the constructed compliance matrix of the relation of superiority, it was found that domination methods exhibited convergence of the obtained results. However, in order to compare the convergence of the results of the ranking methods, the Spearman's linear correlation coefficient was used. The applied MAJA multi-criteria method has made it possible to determine non-dominated solutions considered optimal taking into account the adopted weights of criteria and compliance and non-compliance thresholds. Its unquestionable advantage is the possibility of using many partial criteria expressed in different measurement units. In the presented example, the best options were the premium express rail transport and airplane. The summary defines the direction of further research and possibilities of modification of the presented method.
    Źródło:
    Archives of Transport; 2021, 57, 1; 25-41
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the Bloch-Schmigalla Method to Optimize the Organization of the Process of Repairing Unmanned Ground Vehicles
    Autorzy:
    Małachowski, Jerzy
    Ziółkowski, Jarosław
    Szkutnik-Rogoż, Joanna
    Lęgas, Aleksandra
    Oszczypała, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/103154.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    logistics
    Bloch-Schmigalla method
    equilateral triangles method
    logistyka
    Metoda Blocha-Schmigalli
    metoda trójkątów równobocznych
    Opis:
    The aim of this paper was to present the application of the Bloch-Schmigalla method in order to deploy work stations and create a military equipment repair model under field conditions. Proper allocation of repair stations is of crucial importance from the point of view of a given material’s flow optimization. The aim of proper object allocation is such use of space that enables continuous, efficient and safe work. On the basis of numerical data, the advantages of using the Bloch-Schmigalla method for the optimal location of repair positions were presented. The proposal to optimize the organization of the repair process with using the Bloch-Schmigalla method entails multiple advantages e.g. decreasing the volume of transport activity size or time saving resulting from the rational arrangement of repair stations for unmanned ground vehicles.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 3; 39-48
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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