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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Ověření výkonnosti harvestorové technologie rozdílných pracovních činností při těžbě lesních dřevin
 LIEBL, Karel
This Master's thesis deals with harvester technology used for forest harvesting, mainly with its efficiency (performance). The thesis describes various types of harvesting in which harvesters are used the most and compares their usage for forest harvesting with the usage of chainsaws. Efficiency is very closely related to the series of inner and outer factors, which influence it both positively and negatively. The impact of these factors is evaluated based on the individual cycles during the harvest and field observations during the variety of harvesting operations. Amongst the most prominent factors are for example operator's experience, type of harvested wood and its characteristics, engine power, performance of hydraulic systems, type of chassis, terrain quality or the influence of meteorological conditions. The aim of this Master's thesis is to perform all necessary measurements and, while using corrected coefficients, alter the calculation of theoretical efficiency to correlate with the actual efficiency.
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The determination of needed power of chainsaw, depending on the type of sawn timber
 LIEBL, Karel
This bachelor thesis deals with a power measurement of chainsaw engines. Their performance is determined by the type and condition of the sawn timber, version of the chainsaw, the chainsaw's power and also with the worker's experience. The main purpose of this bachelor thesis was to make all the necessary measurements required to determine the value of needed cutting power in connection with all the determining factors. Amongst the main factors are power and displacement of the chainsaw's engine, the worker's experience, embodiment of the clutch, the chainsaw's age and also the type and condition of sawn timber, as well as the used chain and the condition of its sharpening. Furthermore, I describe in my work what are the options considering the timber harvesting and during which operations are chainsaws mostly used.
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