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Surface hardening os steels by YbYAG fiber laser
Hromada, Martin ; Daněk, Ladislav (referee) ; Mrňa, Libor (advisor)
Diploma thesis is focused on laser hardening by Yb:YAG fiber laser. Experiment is based on hardening of testing pieces made of steel 12 050 with different parameters of distance and movement speed of laser head. In theoretical part are described principle of laser, types of lasers, laser technology in industry, types of lasers, types of hardening and types of hardness measuring. In practical part are firstly evaluated macrostructure and microstructure photos and Vickers hardness. In conclusion are analyzed the results of laser hardening and after that the best laser hardening parameters were selected.
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Aerodynamic Wind Tunnels in the Automotive
Hromada, Martin ; Zháňal, Lubor (referee) ; Vančura, Jan (advisor)
The aim of bachelor thesis is research themed the aerodynamics wind tunnels in the automotive. Thesis contains overview of historical evolution of wind tunnels and their categorization. Following chapter describes main parts of wind tunnel, ways of measurement in wind tunnels and problems during testing.
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APPLICATION OF MACHINE LEARNING IN CIVIL ENGINEERING
Pálková, Martina ; Hromada, Martin (referee) ; Řehák,, David (referee) ; Podroužek, Jan (advisor)
This thesis deals with the issue of machine learning in modeling of movement of pedestrians, the possibilities of its use and its limitations. The problem is shown on two real examples from practice. Digitization of industry and related use of advanced computing methods, such as artificial intelligence, has undergone unprecedented progress in the last ten years. Nevertheless, the construction industry lags behind other industries. This topic offers a lot of scope for research, the results of which can be very well applied in practice. Machine learning has the potential to be cheap and efficiently process large data sets with high accuracy, almost in real-time. In order for this to be possible, it is necessary to solve questions such as the appropriate choice for the given problem method, its architecture and parameter optimization. Another important direction of research is pre-processing of data, its format and division into training and test sets. This the topic, despite the great progress in the field of machine learning, is still discussed without uniform conclusions. These are the directions in which this work goes.
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Application of pedestrian evacuation and fire spreading models for specific buildings safety improvement
Okřinová, Petra ; Hromada, Martin (referee) ; Dvořák, Zdeněk (referee) ; Apeltauer, Tomáš (advisor)
The current trend in the construction industry is construction “without limits”. In projects and implementations, we encounter non-traditional combinations of operational solutions, geometry and materials, which are still approached mainly using the classic standards from the fire safety point of view. The latter does not allow to comprehensively cover all aspects of these specific buildings without a greater degree of subjective simplification. This raises the question of whether, even in these cases, it is still appropriate and safe to use only a standards approach, or whether buildings deviating from traditional construction should be assessed differently – for example, by so-called fire analysis using numerical models. Currently, users still have very little information about the use of these models, and even in the Czech legislation, there is no document recommending how to proceed when using them for the purposes of building fire safety solutions. Numerical models of evacuation and fire analysis are thus currently the most effective tool for impact analysis and preliminary verification of the effectiveness of proposed safety measures. Therefore, it is necessary to deal with their validation and use, with the goal of innovating existing approaches and standardizing numerical models for fire safety assessment of buildings. Furthermore, it is necessary to compare their possibilities and limitations concerning ČSN and to put together a comprehensive information background as a basis for their more active implementation in practice. The presented work thus focuses on the above-mentioned issue and demonstrates its use of application examples of real specific buildings and a set of compiled studies. The work also points out specific shortcomings and simplifications of standard approach methods, based on which verified procedures and recommendations for the incorporation and use of numerical models in fire safety practice are then established.
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Surface hardening os steels by YbYAG fiber laser
Hromada, Martin ; Daněk, Ladislav (referee) ; Mrňa, Libor (advisor)
Diploma thesis is focused on laser hardening by Yb:YAG fiber laser. Experiment is based on hardening of testing pieces made of steel 12 050 with different parameters of distance and movement speed of laser head. In theoretical part are described principle of laser, types of lasers, laser technology in industry, types of lasers, types of hardening and types of hardness measuring. In practical part are firstly evaluated macrostructure and microstructure photos and Vickers hardness. In conclusion are analyzed the results of laser hardening and after that the best laser hardening parameters were selected.
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Aerodynamic Wind Tunnels in the Automotive
Hromada, Martin ; Zháňal, Lubor (referee) ; Vančura, Jan (advisor)
The aim of bachelor thesis is research themed the aerodynamics wind tunnels in the automotive. Thesis contains overview of historical evolution of wind tunnels and their categorization. Following chapter describes main parts of wind tunnel, ways of measurement in wind tunnels and problems during testing.
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