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    Wyświetlanie 1-4 z 4
    Tytuł:
    Optimization of information flows of logistic supply chain
    Autorzy:
    Oliskevych, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/410696.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    logistic chain
    material flow
    information flow
    time delay
    Opis:
    This research is devoted to the problem of information flows of logistic system of goods supplying. Information messages appear at moment of material flows which should be consider as discrete one. It gives an ability to research all changes that can occur to input material flow. Moreover, it makes a possibility to obtain analytic dependence of showers of effectively of system from parameter of information and material flows interaction. Logistic chain was first decomposed on four basic logistic operation such as distributing, unitizing, breaking up, speed up. Three parameters were used to characterize them. All that parameters depend of main flow of goods, packets, transport packets. The principle of solid material flows was applied. Then points of control were defined. It was researched two parts of main problem. First deals with a increasing material flows andconsequences of logistic chain adopting after that. Second deals with an decreasing flow. Control of several ways of different changes of logistic schemas depends of existed information flows which may be sent at one of defined control point. The criteria of material and information flows interaction effectiveness is total time delay per unit. The principle of streamlining is just-in-time. Deviation of appointed moment of operation starting or finishing equals to additional costs. The result consists the dependence of total delay per unit from structure of information flows. It can be used as a condition of real logistic schema optimization.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 4; 71-76
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vehicle driving cycle optimisation on the highway
    Optymalizacja ruchu pojazdu na autostradzie
    Autorzy:
    Stotsko, Z.
    Oliskevych, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/374429.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    vehicle
    highway
    transport cycle
    energy consumption
    pojazd
    autostrada
    cykl transportowy
    zużycie paliwa
    Opis:
    This paper is devoted to the problem of reducing vehicle energy consumption. The authors consider the optimization of highway driving cycle a way to use the kinetic energy of a car more effectively at various road conditions. The model of a vehicle driving control at the highway which consists of elementary cycles, such as accelerating, free rolling and deceleration under forces of external resistance, was designed. Braking, as an energy dissipation regime, was not included. The influence of the various longitudinal profiles of the road was taken into consideration and included in the model. Ways to use the results of monitoring road and traffic conditions are presented. The method of non-linear programming is used to design the optimal vehicle control function and phase trajectory. The results are presented by improved typical driving cycles that present energy saving as a subject of choice at a specified schedule.
    Artykuł poświęcony jest problemowi redukcji zużycia paliwa pojazdu. Autorzy uważają optymalizację cyklu jazdy autostradą, jako sposób na bardziej efektywne wykorzystanie energii kinetycznej samochodu w różnych warunkach drogowych. Został zaprojektowany model kontroli jazdy pojazdu na autostradzie. Składa się on z cykli elementarnych, takich jak przyspieszenie, wolne toczenie, hamowanie siłą oporu zewnętrznego. Nie został wpisany tutaj reżim hamowania, jako proces rozpraszania energii. Wpływ różnych profili podłużnych drogi został wzięty pod uwagę i uwzględniony w modelu. Jest możliwość korzystania z wyników monitorowania drogi i warunków ruchu. Aby zaprojektować funkcję kontroli pojazdu, używany był optymalny sposób programowania nieliniowego. Wyniki są przedstawiane przez ulepszone typowe cykle ruchu, które zapewniają oszczędność energii jazdy, jako wybór w określonym harmonogramie.
    Źródło:
    Transport Problems; 2016, 11, 2; 123-131
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of the load scheme of heavy vehicle for a given flow of goods
    Autorzy:
    Oliskevych, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/411122.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    road train
    loading
    cargo
    center of gravity
    pociąg drogowy
    załadunek
    środek ciężkości
    Opis:
    This research is devoted to the problem of improving the usage of heavy road trains by increasing their actual loading with cargo. The present paper proves that the extremely forced road train not always fits the permissible loading from its axles and vice versa. This contradiction is reinforced by the fact that flows of general cargoes consist of different transport options packages. They are required to be arranged into a rational scheme of loading vans. There were formulated and showed an example of solving the optimization problem of placing cargo units into five-axle road train. There were used static equations of the mechanical system, which is the tractor plus van plus the general goods. First, the piece goods are considered as reduced to the centre of mass of road train. It was showed the importance to comply with accuracy of the coordinates of the centre of gravity value and its influence on the load of vehicle. The dependence of reducing of permissible loading from the centre of gravity coordinate deviation of the estimated optimal was built. The task of optimization of loading schemes was solved in three stages. In the first stage, there was defined the centre of gravity of cargo. At the second stage, there were taken into account the weight and dimensional parameters of transport packages and made a concentrated mass distribution on the wagon platform. It was found that it is advisable to choose the weight of transport packages for optimal load circuit. Each optimal loading scheme should meet the current transport scheme process of cargo delivery. To this aim, it was formulated and solved the problem of the third stage which variables are the parameters of incoming and outgoing flows such as fronts of vehicles, size of groups of cargo in packets.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 1; 55-62
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of periodic unitary online schedule of transport tasks of highway road trains
    Autorzy:
    Oliskevych, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/961426.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    scheduling
    transport cycle
    process delay
    routing
    harmonogramowanie
    cykl transportowy
    opóźnienie procesu
    trasowanie
    Opis:
    The paper is devoted to the problem of optimization of transport tasks’ execution schedule. The exploitation of a group of interdependent highway road trains is considered. The task differs from the known ones by limitations of the duration of a cycle within which a maximum number of goods transportation orders must be fulfilled. There are also limited intervals of time when loading and unloading of vehicles is permitted at appropriate points of a transport network. The solution of the problem consists in distributing a given number of road trains between orders, finding the shortest path for each of them, and determining the time of their departure and arrival provided the absence of idle runs and with minimal time delays of the process. It is shown that a maximum numer of completed tasks are proportional to the duration of the cycle up to a certain limit only. The optimization is carried out for two options: in the absence and presence of restrictions on repeatability of freight flows from one point. The used algorithm guarantees an exact solution for an acceptable period of time for a small-dimensional task.
    Źródło:
    Transport Problems; 2018, 13, 1; 111-122
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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