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Využití přístrojových metod k hodnocení stavu stromů
Vančurová, Klára
The bachelor thesis is focused on the topic: Use of instrumental methods to evaluate the condition of trees. The first part of the literature review describes the vitality of trees and explains why they are evaluated. Subsequently, the work deals with the division of individual methods and devices into visual and instrumental evaluation. These are then further categorized according to their principle of use.Totaly were evaluated four instrumental methods of physiological vitality and for biomechanical vitality six visual and eighteen instrumental method. In the next part, based on the description of these instrumental methods, an analysis of companies in the Czech Republic was created, which provide measurement and evaluation of expert opinions with these instruments.
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Srovnání hodnot stability stromu zjištěných různými přístrojovými metodami
Šíma, Marek
The thesis is focused on the comparison of tree stability values and break resistance of stem against fracture using various instrumental methods. The accuracy and suitability of individual methods is discussed in the literature review. At the selected locality, the trees were visually evaluated and subsequently the break resistance of stem was measured. The methods used were acoustic tomography and pulling test. The basic value of the stability of a healthy tree under wind load and the stability value with respect to stem damage by defect or rotting are compared.
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Numerický model odezvy stromu během tahové zkoušky
Vojáčková, Barbota
The numerical simulation of the tree pulling test was carried out in the thesis. ANSYS Parametric Design Language was used for the simulation. The parametric design enables use of simulation for variations of tree dimensions, material properties and device positions. Results from numerical solution were compared with a field experiment and analytical solution in cases of three oaks. To found significant influence of input parameters probabilistic analysis was carried out. The analysis found that there is a significant correlation among stem diameter, root volume and tree inclination and nodes displacement on the tree stem. The influence of stem defect and root-plate damage on ability of devices was found as well. Numerical model can be used for the simulation of tree pulling test in wide variety of different configurations, for example change of geometry, material properties and defects extension and position of stem and root-plate system. The practical impact of results and further development of numerical simulation are discussed at the end.
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