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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Numerická předpěťová modální analýza kmene
 Skokan, Vojtěch
This work is investigating the effect of prestress on the results of the numerical modal analysis of tree stem and the effects of the degree of simplification of the geometry of the numerical model on the values of natural frequencies and modes of natural oscillation. The work aims to create credible numerical models of trunks and to use prestress to induce such a change in the diameter of the trunk that occurs in trees during the diumal cycle, thus simulating the transpiration stress in the trunk. During the work, three different methods of inducing prestress in the trunk are investigated and their impact on the values of the observed frequencies of strain models is assessed. In addition to artificial prestress, the work also assesses the impacts of the co-effect of gravity on the values of natural frequencies. This work is one of the first attempts to investigate the effect of mechanical stress caused by the transpiration flow using numerical simulation and can thus lay the foundation for future research in this field.
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Vliv vlhkosti na velikost řezné síly při obrábění nativního dřeva
 Skokan, Vojtěch
This bachelor's thesis deals with the influence of water content in wood on the energy parameters of oak wood machining. The main parameters under research were cutting force and specific cutting resistance. The results of experimental measurement of these parameters were compared with the results of theoretical calculation methods, Technological-statistical and Analytical methods. The results and statistical tests carried out determined the effect of moisture on the size of the cutting force and specific cutting resistance. In conclusion, the values of the cutting force increase with increasing humidity to FSP, and as humidity increases above FSP, the values decrease. The specific cutting resistance increased to FSP as the moisture of the patterns under viewed increased and decreased as humidity increased further above this limit.
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