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Analysis of hysteresis behavior of vertical headlight adjustment in an automobile
Holec, Radek ; Hadač, Ondřej (referee) ; Vosynek, Petr (advisor)
The thesis deals with the occurrence of mechanical hysteresis in the vertical adjustment mechanism of car headlights. The adjustment mechanism contains certain inaccuracies that can result in mechanical hysteresis, a phenomenon in which the light source does not return to its original position and the direction of the light rays is deviated from the intended direction. The first part of the paper deals with contacts and friction in the connectors in the Abaqus software. Then the development of the computational model is described. This model is further compared with the measured values of the actual headlamp. A DOE (Design of Experiment) was performed and these results were processed using regression and sensitivity analysis. The effect of clearances and high friction moments was found to be the most significant. The paper concludes by describing the principles by which hysteresis arises and quantifying the various parameters that affect hysteresis.
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Heat transfer in modern automotive lights
Holec, Radek ; Klimeš, Lubomír (referee) ; Štětina, Josef (advisor)
The beginning of this thesis is dedicated to light in general and all different types of vehicle lightning, also deals with various types of light sources and specifically about LED where it describes the temperature change behaviour. Second part deals with heat transfer by conduction, convection, and radiation, it describes quantities and relationships needed for next capitols. In the penultimate part is described thermal management of headlights, therefore different options of cooling and causes of heat generation, and different types of PCBs that are used in automotive. In the last part is proposed the heatsink, which should be used for cooling LED chips of daytime running lights.
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Heat transfer in modern automotive lights
Holec, Radek ; Klimeš, Lubomír (referee) ; Štětina, Josef (advisor)
The beginning of this thesis is dedicated to light in general and all different types of vehicle lightning, also deals with various types of light sources and specifically about LED where it describes the temperature change behaviour. Second part deals with heat transfer by conduction, convection, and radiation, it describes quantities and relationships needed for next capitols. In the penultimate part is described thermal management of headlights, therefore different options of cooling and causes of heat generation, and different types of PCBs that are used in automotive. In the last part is proposed the heatsink, which should be used for cooling LED chips of daytime running lights.
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