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Optimizing the shape of the mower´s cover in terms of airflow at different arrangement of blades
Mihula, Lukáš ; Novák, Petr (advisor) ; Chyba, Jan (referee)
The aim of this thesis is to create a contemporary overview on the issue mulching using contemporary Czech and foreign literature. In the chapter Mulching is described in this technology and distribution mulchers and theoretical principle of their function and possible uses. The section Methodology already contains the actual description of the construction of the model shredder Vertical axis and a theoretical description of the pressure measurement using pressure strips on the mower housing. The actual results of the measurements and their interpretation, see chapter "Measurement Results". Subsequent comparison of measured values is described in Comparison of results. In the last chapter, Economic assessment is a calculation of unit costs set mower with energy means.
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Influence of rotary mowers configuration on energy demands
Harkot, Mikuláš ; Chyba, Jan (advisor) ; Novák, Petr (referee)
This thesis aims to acquaint with the problems of mulching with vertical rotation axis. Emphasis is laid on energy demands and influences that may affect it. Especially arranging of knives of various construction types. In this thesis are introduced the characteristic of mulching machines and their comparison, a description of power indicators and losses and, ultimately, characteristic of elements of energy intensity.
The practical application of the thesis describes the methodology of work and measurements, which were carried out on the model of mulching machine. This part of the work also deals with the evaluation of the results from the measurement of power and torque depending on speed. In this thesis is carried out a statistical evaluation of measured values to validate the results. The results confirmed the existence of the effects of the arrangement of working tools on the energy intensity of mulcher. The last part of the thesis deals with the calculation of unit costs mulching machines per unit area and determination of fuel savings by changing the RPM.
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Monitoring of rolling greens methods and frequency impact on green speed on selected courses
Fichtl, Lukáš ; Kumhála, František (advisor) ; Chyba, Jan (referee)
This diploma thesis is focused on monitoring of golf green rolling methods and its frequency impact on green speed on selected courses. In the first part of this thesis issues relating to golf, global history of golf and history of golf in Czech Republic are analyzed, also are described golf green construction methods here. There is also described golf green rolling and the effects of rolling. The next part presents methodology of experiments and presents the results of these experiments. The analyzed data showed that the green speed did not decrease too much during the day. The results of another experiment showed that the different types of used rollers have just a little effect on a final green speed increase. In other words, the differences in green speed increasimg, caused by using of different green rollers, cannot be detected by any golf player.
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