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Gewählte Doctoral Thesis:

Franz Holzleitner (2013): Analyzing time and fuel consumption of timber harvesting and transport processes based on long-term machine data.
Doctoral Thesis - Institut für Forsttechnik (FT), BOKU-Universität für Bodenkultur, pp 60. UB BOKU obvsg

Data Source: ZID Abstracts
For analyzing and optimizing processes and trip times, the knowledge of every process and its attributes, such as time and fuel consumption, within the work flow is an important factor. Existing supply chains still show weak points concerning costs, organizational effort and applicability under mountainous conditions. This study aims at analyzing productivity and costs, using time and fuel consumption of timber harvesting and transport processes, based on long-term machine data. For chip transport the main factors of productivity are transport distance, load volume and bulk density of the material. At a distance of 50 km and a bulk density with 370 kg m3 loose a productivity of 11.1 m3 loose/PSH15 can be achieved. The difference of supply costs is highest at a distance with 30 km due to waiting time of trucks at the chipper to be served. At 60 km the direct loading concept gets cheaper than the self-loading concept. For round wood transport the distance from the forest to the sawmill averaged out 51 km. Average share on forest roads within a route to the sawmill was 14.2 % with an average speed of 13.5 km/h. Transport costs from the forest site to the sawmill with a truck and trailer were 11 €/ m3 solid timber, based on an average load size of 25 m3. An average 100 l of fuel per 100 km was consumed during a round trip including all work phases. The average distance between chipping sites and plants was approx. 54 km. Fuel consumption from transport reached 50 l/100 km. The chipping unit reached a productivity of 12.8 odt/ PSH15 and had a fuel consumption of 58 liters per operating hour. The average annual utilization of all skidders was approx. 1,150 PMH15 per year. Skidders consumed an average 7.3 liters/PMH15 with repair costs of 11.4 €/ PMH15. For the fully mechanized harvesting system, the harvester achieved 2,040 PMH15/year and the forwarders 2,070 PMH15/year. The annual utilization of cable yarding systems is between 560 PMH15 and 1,500 PMH15.

Betreuer: Stampfer Karl

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