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    Wyświetlanie 1-2 z 2
    Tytuł:
    Zastosowanie programowania liniowego do optymalizacji zrywki drewna w trzebieżach
    Application of the linear programming to optimizing wood extraction in thinnings
    Autorzy:
    Jabłoński, K.
    Stempski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/989674.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    trzebieze
    zrywka drewna
    skladnice drewna
    lokalizacja
    optymalizacja
    programowanie liniowe
    linear programming
    simplex algorithm
    wood extraction
    Opis:
    Improvement cuttings conducted simultaneously on a few closely located areas, often face problems about how to prepare places that would serve as temporary landings for the harvested wood. This results from insufficient wood storing space in the forest and limited accessibility of the road network to wood hauling trucks, and leads to solutions, suggesting where small landings at tree−stand edge must be established, often in places rather distant form the thinning plots. When the wood is harvested on several thinning plots and should be transported to several small landings, a problem appears, where (i.e. to which landing) should the wood from a particular thinning plot be sent. The paper presents a model to solve this problem using the simplex algorithm, which is used in linear programming, a method applied in operations research. The wood was sourced from 15 thinning plots and 11 wood landings were located. In the model, the objective function presented total transportation work, to be spent on the wood extraction. The objective function was minimized. The problem was set up on the Excel spreadsheet and then resolved with the solver application. The model enabled to direct the harvested wood from different thinning plots to different landings in an optimal way. The results enabled to design the optimal wood extraction routes and to determine the allowable changes in the amounts of wood harvested from each thinning plot, which would not change the optimal solution. The model enabled also to calculate the minimum amount of transportation work, which would be spent during the optimized transportation of wood form particular thinning plots to particular wood landings.
    Źródło:
    Sylwan; 2016, 160, 01; 3-10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optymalizacja zrywki drewna według kryterium minimalizacji pracy transportowej
    Optimization of wood extraction from a clear-cut area according to the minimum transportation labour criterion
    Autorzy:
    Jabłoński, K.
    Stempski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/989792.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    zrywka drewna
    optymalizacja
    prace transportowe
    minimalizacja
    programowanie liniowe
    wood extraction
    linear programming
    transportation labour
    Opis:
    The objective of the study was to optimize wood extraction from a clear−cut area to several upper landings located at roads suited for wood haulage in a situation where the room for storing the wood was limited. The optimization process was to divide the clear−cut area into zones, from which the wood assortments should be transported to the different landings, so that the total transportation labour would be minimized. The research was conducted in Oborniki Forest District (western Poland) on a clear−cut area where the harvest of 2027 m³ of wood in four assortments was planned. The optimization method used presented a linear programming problem, which was formulated and solved with the Solver tool, available with a common spreadsheet. The clear−cut area was divided into a number of elementary plots, for which the quantities of the wood to be extracted and distances to the specified landings were determined. Altogether 189 such plots were defined, mostly square in shape and with 20 m long side. Three upper landings for each wood assortment, located at roads accessible to long−distance vehicles were also determined (fig. 1). The minimization of the transport labour needed for the extraction of different wood assortments was set as the criterion for the objective function. The results of the calculations, after putting them on the forest clear−cut area map (fig. 2), provided information about parts of the clear−cut area to which the wood should be extracted to. As it was expected, in the majority of cases, the model directed the wood to the landings, which were the closest, but in case of one assortment, the wood was directed to the landing located a bit further away than to the closest one. The model enabled to minimize the transportation labour spent on wood extraction from the clear−cut area. The calculations did not require any specific applications, enabling users of commonly available spreadsheets, equipped with a Solver tool to perform such calculations.
    Źródło:
    Sylwan; 2015, 159, 07; 540-548
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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