The paper presents the work performance analysis of timber harvesting with the use of Highlander harvester produced by KONRAD Forsttechnik GmbH. The analysis was performed based on the timing of the working day. We also assessed the organization of the machine operation in the research area and its functional capability. The study was conducted in Miçdzylesie Forest Department, Nowu Wieś Forestry in fresh mixed mountain forest, where the machine acquired spruce. Timing was perfonned based on the registration of the machine operation on a video camera and the measurements of collected assortment. Based on the results of measurements it was found that organization of the machine operation was not the best. A one-shift work system and short duration of a shift caused that the effective working time occupied only 67.9% of the shift time (about 4 hours). This resulted in reduction of the operating perfonnance on a working day which was only 12,7 m3·h−1, while an effective high-efficiency was 18.7 m3·h−1.
The article presents analysis of operation of Fao Far 6840 mini harvester for machine wood harvesting. Analysis was made based on working day timing. The investigations were carried out on the area of Lubliniec Forest Inspectorate, Bór Forestry on the habitat forest site − fresh mixed forest where pine wood was obtained with the use of a harvester. Timing was carried out based on the registration of the exploitation time of a harvester with the use of a video camera and stopwatch and measurements of the obtained size grade. Based on the obtained results low values of performance in the exploitation change time 9.61 m3·h−1, and effective performance 12.14 m3·h−1 were reported. Low machine performance was affected mainly by conditions of harvesting, low log volume (at the average 0.62 m3) and concentration of trees. The head structure (applied feed system), weak work organization (short time of a single 6 hour shift) and weak skills of the machine operator were additional factors that reduced the performance
The paper presents analysis of efficiency of the logging unit comprising Belarus 820 farm tractor and PD80 logging trailer equipped with Ryś-1 crane. Analysis was made based on the working day timing. The unit logged 1- meter long tree pieces (hornbeam, oak, birch) from the area where material for logging was distributed irregularly on the entire felling site. Unfavourable atmospheric conditions were reported during the working day (a thick layer of snow, low temperature, not frozen soil) which could have influenced the unit operation performance. Despite that the performance of the logging unit was comparable to similar logging units described in the literature. Determined coefficient of use of the operating time of the machine K02 was 0.93, coefficient of use of the shift working time K04 − 0.9, coefficient of use of the shift exploitation time K07 − 0.8. Hourly performance in the shift exploitation time was 4.98 m3·h−1, efficiency in the shift working time W02 − 4.80 m3·h−1 and performance in the general shift time W07 − 4.30 m3·h−1.