National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Optimization of infill selection with an emphasis on maximum dynamic resistance
Konvalina, Michal ; Svoboda, Petr (referee) ; Jopek, Miroslav (advisor)
The thesis deals with the study of the effect of different wall thicknesses of 3D printed infill patterns at constant cross-sectional area on their final properties under static and dynamic loading. Based on literature study, two experimental methods are chosen. The quasi-static test and the Taylor anvil test. For the experiment, square and hexagonal grid specimens are printed using FDM technology from PLA material. Quasi-static test is used to measure the static properties such as maximum compressive strength, yield stress, modulus of elasticity and to derive material model of Johnson-Cook. The dynamic impact test TAT is used to evaluate different types of patterns at high impact velocities. In ANSYS, the specimens that resisted the highest impact velocities in TAT are simulated and strain rate sensitivity parameter is optimized for the specific velocity. The highest dynamic resistance was achieved by a square infill pattern with wall thickness of 0,4 mm at an impact velocity of 37 ms-1.
Forging of rotary forgings
Konvalina, Michal ; Štroner, Marek (referee) ; Lidmila, Zdeněk (advisor)
The thesis is focused on manufacturing proposal of the conveyor chain sprocket using die forging from steel C45 (12 050). Based on the literature review of eligible technologies, volume termoforming technolology has been selected here, more accurately closed die forging on a vertical crank forging press with an open flash gutter. Dimensions of forging and die are designed according to appropriate valid standards. Based on calculated tensile force of 10,83 MN will be forging performed on vertical forging press LZK 1600 P/SH. Forging die will be made of low alloy tool steel 1.2713 (19 662) and ejection of forging will be executed by three ejector pins in lower and upper finishing die.
Forging of rotary forgings
Konvalina, Michal ; Štroner, Marek (referee) ; Lidmila, Zdeněk (advisor)
The thesis is focused on manufacturing proposal of the conveyor chain sprocket using die forging from steel C45 (12 050). Based on the literature review of eligible technologies, volume termoforming technolology has been selected here, more accurately closed die forging on a vertical crank forging press with an open flash gutter. Dimensions of forging and die are designed according to appropriate valid standards. Based on calculated tensile force of 10,83 MN will be forging performed on vertical forging press LZK 1600 P/SH. Forging die will be made of low alloy tool steel 1.2713 (19 662) and ejection of forging will be executed by three ejector pins in lower and upper finishing die.
Online reporting on football matches as a format of sports journalism from a perspective of its authors
Konvalina, Michal ; Trunečka, Ondřej (advisor) ; Macková, Veronika (referee)
The Bachelor thesis Online reporting on football matches as a format of sports journalism from a perspective of its authors describes online reporting as one of new types of sports journalism in the digital era and engages in forms of online reports in chosen Czech media outlets. The main method used while completing the thesis were semi-structured interviews with deputies of chosen media outlets. The main research topics were targeted on the beginnings and present state of live reporting in the particular media outlet, specifics of online reports and what does writing online reports require from their author and the use of multimedia and statistical databases. Based on collected data, the work describes similarities and differences between online reports that are caused by different way of creating those reports by particular media outlet.
Online live blog on football matches in Czech media
Konvalina, Michal ; Trunečka, Ondřej (advisor) ; Macková, Veronika (referee)
The Bachelor thesis Online reporting on football matches as a format of sports journalism from a perspective of its authors describes online reporting as one of new types of sports journalism in the digital era and engages in forms of online reports in chosen Czech media outlets. The main method used while completing the thesis were semi-structured interviews with deputies of chosen media outlets. The main research topics were targeted on the beginnings and present state of live reporting in the particular media outlet, specifics of online reports and what does writing online reports require from their author and the use of multimedia and statistical databases. Based on collected data, the work describes similarities and differences between online reports that are caused by different way of creating those reports by particular media outlet.
Online live blog on football matches in Czech media
Konvalina, Michal ; Trunečka, Ondřej (advisor) ; Macková, Veronika (referee)
The Bachelor thesis Live online reporting on football matches in Czech media describes online reporting as one of new types of sports journalism in the digital era and engages in forms of online reports in chosen Czech media outlets. The main method used while completing the thesis were semi-structured interviews with deputies of chosen media outlets. The main research topics were targeted on the beginnings of live reporting in the particular media outlet, whether there are any internal rules about creating those reports, what does writing online reports require from their author and the use of multimedia and statistical databases. Based on collected data, the work describes similarities and differences between online reports that are caused by different way of creating those reports by particular media outlet.

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