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Development of the Impact Energy Absorber Made by Metal 3D Printing
Kraicinger, Vít ; Malý, Martin (referee) ; Vrána, Radek (advisor)
Today, variously profiled parts are mainly used for energy absorption. For special cases, precise components are designed, as in the case of Formula Student, where a deformation article with a honeycomb structure is used. This bachelor thesis is focused on the design of an impact energy absorber made by SLM technology and lattice structures. For the design itself, a comprehensive overview of current knowledge in the field of deformation zones, energy absorbers and researches dealing with energy absorption was created. Based on the study, the most suitable material to produce AlSi10Mg was selected. Subsequently, the appropriate type of grid (BCC) and all parameters of the lattice structure were determined. Two energy absorbers with different struts diameters (0.4 mm and 0.8 mm) and different grid sizes (4 mm and 8 mm) were modeled for the selected parameters. At the end of the work are two simplified calculations that show the predicted final values of the proposed absorbers and the stiffness of the layers of the lattice structure with graded density.
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Optimization of turbocharger operation to reduce thermal instability in the exhaust
Kraicinger, Vít ; Ušiak, Michal (referee) ; Böhm, Michael (advisor)
This diploma thesis deals with the reduction of instability of exhaust gas temperatures with the help of optimized turbocharger operation, for the operation of the catalyst in the optimal temperature range. The introduction describes the individual effects on exhaust gas temperatures and the effect of this temperature on emissions. Furthermore, the work describes the turbocharger's function and individual parts, especially the types of regulations used. The 1.5 TSI EA211-EVO drive unit from Volkswagen is selected for the simulations and the optimization itself. Furthermore, the work contains the creation of two models with different turbocharger control (WG, VNT), and their subsequent optimization to approximate the real speed characteristics and adjustment for the possibility of simulations of transient phenomena. At the end of the work, the mentioned optimization of turbocharger operation on the emission WLTP cycle and the subsequent comparison of the reduction of exhaust temperature instability is performed.
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Optimization of turbocharger operation to reduce thermal instability in the exhaust
Kraicinger, Vít ; Ušiak, Michal (referee) ; Böhm, Michael (advisor)
This diploma thesis deals with the reduction of instability of exhaust gas temperatures with the help of optimized turbocharger operation, for the operation of the catalyst in the optimal temperature range. The introduction describes the individual effects on exhaust gas temperatures and the effect of this temperature on emissions. Furthermore, the work describes the turbocharger's function and individual parts, especially the types of regulations used. The 1.5 TSI EA211-EVO drive unit from Volkswagen is selected for the simulations and the optimization itself. Furthermore, the work contains the creation of two models with different turbocharger control (WG, VNT), and their subsequent optimization to approximate the real speed characteristics and adjustment for the possibility of simulations of transient phenomena. At the end of the work, the mentioned optimization of turbocharger operation on the emission WLTP cycle and the subsequent comparison of the reduction of exhaust temperature instability is performed.
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Development of the Impact Energy Absorber Made by Metal 3D Printing
Kraicinger, Vít ; Malý, Martin (referee) ; Vrána, Radek (advisor)
Today, variously profiled parts are mainly used for energy absorption. For special cases, precise components are designed, as in the case of Formula Student, where a deformation article with a honeycomb structure is used. This bachelor thesis is focused on the design of an impact energy absorber made by SLM technology and lattice structures. For the design itself, a comprehensive overview of current knowledge in the field of deformation zones, energy absorbers and researches dealing with energy absorption was created. Based on the study, the most suitable material to produce AlSi10Mg was selected. Subsequently, the appropriate type of grid (BCC) and all parameters of the lattice structure were determined. Two energy absorbers with different struts diameters (0.4 mm and 0.8 mm) and different grid sizes (4 mm and 8 mm) were modeled for the selected parameters. At the end of the work are two simplified calculations that show the predicted final values of the proposed absorbers and the stiffness of the layers of the lattice structure with graded density.
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