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Analysis of influence of geometric deviations of semifinished product on following bending process
Anděl, Tomáš ; Kubík, Petr (referee) ; Vosynek, Petr (advisor)
Presented diploma thesis was created in cooperation with Siemens s.r.o., and deals with the analysis of the bending of aluminium sheets which are later used as a conductors of high voltage electrical energy. These parts are completed into assemblies which serves as connectors of particular segments of an electrical network. The problem occurs as a result of incorrect bend, because it is impossible to join these sections properly. The customer would like to verify if the defined tolerances of semi-finished products are sufficient for proper bend and in case they are not, the tolerances should be modified. Due to the requirement for running numerical simulation in one of the open source software, the Salome-Meca program environment was used.
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The usage of Salome Meca workbench for task solution in the field of solid mechanics
Anděl, Tomáš ; Návrat, Tomáš (referee) ; Vosynek, Petr (advisor)
Presented bachelor’s thesis focuses on solving basics tasks in the field of solid me-chanics by the finite-element open-source software Salome Meca. The theoretical background of finite element method (FEM), general explanation of basic expressions and brief summary of today’s used open-source and commercial software too is intro-duced in the opening part of the thesis. The brief overview of Salome Meca compu-ting environment and then file of individual tasks solved by using this software are followed. Acquired results are later compared with the other numerical software (ANSYS Workbench) or with analytical solutions.
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Analysis of influence of geometric deviations of semifinished product on following bending process
Anděl, Tomáš ; Kubík, Petr (referee) ; Vosynek, Petr (advisor)
Presented diploma thesis was created in cooperation with Siemens s.r.o., and deals with the analysis of the bending of aluminium sheets which are later used as a conductors of high voltage electrical energy. These parts are completed into assemblies which serves as connectors of particular segments of an electrical network. The problem occurs as a result of incorrect bend, because it is impossible to join these sections properly. The customer would like to verify if the defined tolerances of semi-finished products are sufficient for proper bend and in case they are not, the tolerances should be modified. Due to the requirement for running numerical simulation in one of the open source software, the Salome-Meca program environment was used.
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The usage of Salome Meca workbench for task solution in the field of solid mechanics
Anděl, Tomáš ; Návrat, Tomáš (referee) ; Vosynek, Petr (advisor)
Presented bachelor’s thesis focuses on solving basics tasks in the field of solid me-chanics by the finite-element open-source software Salome Meca. The theoretical background of finite element method (FEM), general explanation of basic expressions and brief summary of today’s used open-source and commercial software too is intro-duced in the opening part of the thesis. The brief overview of Salome Meca compu-ting environment and then file of individual tasks solved by using this software are followed. Acquired results are later compared with the other numerical software (ANSYS Workbench) or with analytical solutions.
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Examination of the diversity and digging activity of dung beetles in pasture
ANDĚL, Tomáš
The survey of the diversity of coprophagous beetles (Scarabaeidae, Geotrupidae, and Hydrophilidae families) and their soil activity took place at two sites in a cattle pasture in southern Bohemia (site A: 49°29'31.720"N, 14°23'44.310"E; site B: 49°29'23.257"N, 14°23'35.964"E; 575 m a. s. l.). Baited pitfall traps with fresh cow dung (1.5 l per trap) were used to capture the beetles. During the survey of the diversity of coprophagous beetle community, a total of 29 species of beetles numbering 1,189 specimens were captured from May to September 2013. Of these, the most numerous were the beetles of the genus Aphodius, who made up 79 % of the total number of captured specimens. In terms of biomass, Geotrupes spiniger (Marsham, 1802) was significant, in that it made up 24 % of the total biomass of all of the captured beetles. This species contributes most to the decomposition of dung in the pasture. The family with the least number of specimens was Hydrophilidae. Beetles from this family made up 19 % of total number. Measurement of soil activity took place repeatedly over the course of 3 weeks, always after one-week measurement of diversity. The most numerous species (A. fimetarius, A. rufus and A. fossor) showed a linear dependence of the abundances in soil-activity traps on the abundances in diversity traps from the precedent capture period. A. sticticus was one of the most numerous species during surveys of diversity (10 %). This species, belonging to the dwellers group, was not recorded in soil-activity traps, however. Large tunnellers were represented mainly by G. spiniger in traps, for which the linear dependence was not possible to confirm.
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The sound pressure levels at tractors of the same power
ANDĚL, Tomáš
This thesis deals with the measuring of the sound pressure levels at tractors of the same performance class. Tractors of the following types: John Deere 6230, Case IH JX 95, Steyr 9094, belonging to medium-power tractors, were selected for this specific measuring. The measuring was performed in three operating states of the tractors: at the idle speed, at the maximum no-load speed and at the load of the tractor. A special methodology was developed for these measurements. The measuring results imply that the highest influence on the noise levels of the tractors is that of the motor speed. The sound pressure levels measured at the load of the tractor were by 6.8 to 8.5 dB lower than those measured at the maximum speed. This difference results especially from the operation of the loaded tractor at a lower speed than the maximum.
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