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Comparison of joints for plastic parts
Matzke, Patrik ; Benč, Marek (referee) ; Harant, Martin (advisor)
The bachelor thesis deals with technologies for joining plastic parts in the field of headlight construction. The aim is to focus on and compare staking and self-tapping screw technologies for the application of joining optical parts made of plastic with printed circuit boards containing LEDs. In addition, to provide a comprehensive overview of these technologies and to make a comparison from a technical and economic point of view. In the practical part, a comparison of these technologies in terms of strength is made, for which a tensile test was used. From an economic point of view, the requirement is to propose a preliminary economic calculation, used for design proposals depending on the number of pieces produced, which is applied to a specific example.
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The effect of manufacturing inaccuracies on the final light intensity distribution of an automotive headlamp
Březnová, Tereza ; Lysa, Bohuslav (referee) ; Novotný, Jan (advisor)
The thesis deals with the issue of headlamp defects arising during production and their impact on the resulting light trail. The thesis describes and analyses defects arising during individual correction loops. Their analysis was carried out in order to provide measures for other projects. The main defects that have been assessed include the position of the light source, the quality of the optical surfaces and the associated quality of the plating, inaccuracies of the optical surfaces, dimensional variations due to installation technology and defects on the cover glass. The proposed measures concern the pressing tool, accuracy of machining and surface polishing. The thesis also includes designing solutions for quick identification of the surface quality of the cover glass by remote projection. Individual defects were described by their originators, their seriousness and their reparability. Based on this information, recommendations for production are proposed.
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Design and optimization of a low beam LED headlamp reflector
Varhaníková, Alžbeta ; Kapusta, Martin (referee) ; Novotný, Jan (advisor)
The diploma thesis deals with the optical design of low beam LED reflector. The thesis aims to optimize the existing low beam LED reflector with an emphasis on achieving a legal and homogeneous light distribution. The theoretical part contains the essay of light sources and optical systems used in headlights, as well as the description of the production technology of LED reflector for different polymeric materials. The experimental part presents a detailed methodology for the optical design of low beam LED reflector in the company software. The thesis also contains a description of the original low beam LED reflector and its problematic parts. The optimization of LED reflector was performed by changing its construction and by the replacement of the light source which increased the robustness of the whole system. In the conclusion, the optimization of LED reflector is evaluated by comparing final light distributions for individual LED reflectors.
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The mounting jig concept for mounting the LED headlight module
Žlebek, Jan ; Kohout, Marek (referee) ; Zeizinger, Lukáš (advisor)
The aim of this thesis is to propose the concept of a universal preparation for mounting the LED module of the headlamp. The first part of the thesis is devoted to individual components of the headlamp, such as printed circuit boards, coolers, optical elements, etc. Furthermore, the thesis provides an overview of the types of modules currently used, from basic reflector technology to the most modern projection modules. The next part of the thesis is focused on conceptual designs for mounting the modules on pallets. It continues by the design of the pallet, which was further verified by the FEM method whether it complies with the given parameters. The last part of the thesis summarizes the advantages and disadvantages in the implementation of the proposed method into the production.
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Analysis of the effect of damping on the magnitude of the response during dynamic headlamp excitation
Lukáš, Jan ; Biskup, Martin (referee) ; Vosynek, Petr (advisor)
The aim of the submitted diploma thesis is the magnitude determination of the headlamp response to the dynamic excitation. Currently it is necessary to measure this response, because it is one of the assessed criteria of quality of the headlamp. When comparing results of the experimental measurement and the computational modelling, a good consensus of resonant frequencies is observed, but there are significant differences in acceleration amplitudes. The cause of this is the variable damping value. The theoretical part of the thesis deals with polymeric materials, basics of oscillation and damping. It serves to understand the mechanisms, which influence the results of the experimental measurement. The practical part is dedicated to the procedure of the computational modelling and the experimental measurement implementation. The analysis of the experimental measurement results leads to an ascertainment of nonlinearities, which influence the headlamp behaviour. The results of a sensitivity analysis of the computational modelling are used to create curves, on the basis of which the damping is estimated. The inclusion of the estimated damping into computational modelling leads to reduction of the compared differences of the acceleration amplitudes. The conclusion of the thesis contains the recommendation for the damping determination during the computational modelling of the headlamp.
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Active cooling of the car headlight
Žlebek, Jan ; Mauder, Tomáš (referee) ; Štětina, Josef (advisor)
The main goal of this bachelor thesis is to design the cooling of the headlamp by using a Peltier module. The first chapter is to acquaint the reader with the possibility of heat transfer. Further work is focused on various types of heatsinks and printed circuit board. The third part describes the principle of functions of Peltier's module. The last part of the work contains the design of the heatsink assembly and the design solution of fixing the cooling assembly in the housing.
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