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Surface treatment of a composite part
Bahenský, Štěpán ; Žák, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This diploma thesis focuses on composite materials and the possibility of their surface treatment with a focus on painting. The aim was to create a layer on the surface of the material that would serve as protection against UV radiation and subsequent degradation. The first theoretical part is devoted to the material composition. In the subsections, the different types of functional components of the composites are presented. Their possible applications as well as their advantages and disadvantages are described. In addition, the theoretical part is supplemented by the types of methods used for the production of composite materials and the subsequent surface preparation in order to improve the adhesion properties of the material to the paint. The second part, which was developed in cooperation with GDP Koral, s. r. o., deals with the chosen type of surface treatment for composite materials produced by the pultrusion method. The UV coating method was chosen, where the wet layer of the varnish is cured by UV radiation. Two sets of samples were created, which differ in both the method of varnish application and the parameters of the curing process. Mechanical tests were then performed on each sample to verify the resulting adhesion capability of the paint system. The practical part also includes the design of possible technologies for the implementation of the surface treatment in the production line. In the third part, a techno-economic evaluation is presented, which focuses on the cost comparison of standard painting and painting with UV varnishes. The final section contains a summary of the findings and an evaluation of the chosen type of coating with respect to the results of mechanical tests and the possibilities of application in a pultrusion production process.
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Electric drives in commercial vehicles and buses
Bahenský, Štěpán ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This bachelor thesis focuses on electric and hybrid powertrains, which are used in utility vehicles and buses. According to this bachelor thesis is divided into two main parts. The first part deals with pure electric drives and its basic components. The subchapters describe various types of engines that are commonly used, but also the features and technologies of batteries. The second part deals with hybrid technologies, division according to the arrangement of components in vehicles, advantages and disadvantages of these solutions. Attention is also paid to the possibilities of battery systems. At the end of both parts, there are examples of commercial vehicles and buses with appropriate motorization, their comparison with competing models and a list of chosen technical parameters. The final chapter summarizes the current direction of the market and its further possible development in the future.
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Surface treatment of a composite part
Bahenský, Štěpán ; Žák, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
This diploma thesis focuses on composite materials and the possibility of their surface treatment with a focus on painting. The aim was to create a layer on the surface of the material that would serve as protection against UV radiation and subsequent degradation. The first theoretical part is devoted to the material composition. In the subsections, the different types of functional components of the composites are presented. Their possible applications as well as their advantages and disadvantages are described. In addition, the theoretical part is supplemented by the types of methods used for the production of composite materials and the subsequent surface preparation in order to improve the adhesion properties of the material to the paint. The second part, which was developed in cooperation with GDP Koral, s. r. o., deals with the chosen type of surface treatment for composite materials produced by the pultrusion method. The UV coating method was chosen, where the wet layer of the varnish is cured by UV radiation. Two sets of samples were created, which differ in both the method of varnish application and the parameters of the curing process. Mechanical tests were then performed on each sample to verify the resulting adhesion capability of the paint system. The practical part also includes the design of possible technologies for the implementation of the surface treatment in the production line. In the third part, a techno-economic evaluation is presented, which focuses on the cost comparison of standard painting and painting with UV varnishes. The final section contains a summary of the findings and an evaluation of the chosen type of coating with respect to the results of mechanical tests and the possibilities of application in a pultrusion production process.
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Electric drives in commercial vehicles and buses
Bahenský, Štěpán ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This bachelor thesis focuses on electric and hybrid powertrains, which are used in utility vehicles and buses. According to this bachelor thesis is divided into two main parts. The first part deals with pure electric drives and its basic components. The subchapters describe various types of engines that are commonly used, but also the features and technologies of batteries. The second part deals with hybrid technologies, division according to the arrangement of components in vehicles, advantages and disadvantages of these solutions. Attention is also paid to the possibilities of battery systems. At the end of both parts, there are examples of commercial vehicles and buses with appropriate motorization, their comparison with competing models and a list of chosen technical parameters. The final chapter summarizes the current direction of the market and its further possible development in the future.
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