集材架線の最適架設位置に関する研究

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The end of the study is to determine the optimum location of the skyline for the cable crane by using the electronic computer (HITAC 8700) from the technical and economical point of view. First of all, the topographic map, on a scale of 1:2500, including the harvesting area is prepared and matrix is laid out on the map. The harvesting area can be approximately enclosed by tens of straight lines connecting boundary points, i.e. A, B, C,...... (Fig. 4). The configuration of the terrain surface is represented by the cubic curved face. So the elevation at any point in the area is computed on the basis of the elevation at adjacent intersection points. Many lines are drawn from the head tree (H) through the harvwsting area (Fig. 5). Those lines are assumed to be called "planning line". On each planning line, the possibility of setting the tail tree is examined. And if possible, the optimum point for the tail tree on the line is determined. Then, the possibility of the timber yarding in lateral direction is examined in accordance with the configuration of the ground surface along the lateral yarding lines, and also the limiting load of one yarding operation from each point of the harvesting area is determined by calculating the tension of the skyline and operating lines. The yarding time at every point can be calculated in accordance with the yarding distance and the limiting load in one yarding operation. The total required time of each planning line should be calculated as integration of the yarding time at every point in order to find the optimum skyline setting. The total required time for yarding operation is determined by the position of each tail tree. The optimum position of each skyline can be found as the position where the total required time for yarding is minimized. The optimum setting number of the skyline is determined as the number to make the total required time for yarding and the time for replacing the skyline system minimize. Figure 12 is a topographic map on a scale of 1:2500 on which the timber harvesting area and the position of the head tree are laid out. Figure 13,14 and 15 illustrate the optimum position of the tail tree (s) for one skyline setting, two and three respectively. The numeral values printed out by computer in Fig. 13, 14 and 15 show the difficulty of the yarding operation, e.g. 1:Very easy, 8:Very difficult. Comparing the three cases, printer output tells that the optimum number of skyline setting is two settings. Figure 16 illustrates the yarding range of each skyline.
東京大学大学院農学生命科学研究科附属演習林,The Tokyo University Forests,東京大学農学部林学科,Department of Forestry, Faculty of Agriculture, University of Tokyo.の論文

集材架線の最適架設位置に関する研究

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