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Use of 3D printing in the production of functional prototypes for automotive
Mikulášek, Marek ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This thesis deals with the 3D printing of composite materials. The constant development of this technology has enabled the application of this method for the production of prototypes, but also functional components. The theoretical part deals with the study of composite materials and the principle of production using additive technology. In the practical part, an analysis of the suitability of part processing using the 3D printing method is performed on a specific component and than applicated to the assembly hall located in ŠKODA AUTO a.s.
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Concept Design of Turbocharger Regulation to Separate Flue Gas Flow
Rajhel, Martin ; Řehák, Kamil (referee) ; Novotný, Pavel (advisor)
This bachelor’s thesis focuses on the research of existing principles of turbocharger regulation. It is trying to create a concept of turbocharger modification of design to separate the flue gas flow. This concept is applied to a turbocharger which was designed by company Honeywell s.r.o – HTS CZ o.z. The change of shape was realised by using program CATIA v5. In conclusion there is evaluation of the results.
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Design of the Gear Coupling for Railway Vehicle Application
Pelíšek, Vojtěch ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The aim of this work was to create a design of a gear coupling for railway vehicle application. The work presents a comprehensive view of this issue. First of all, a brief theoretical introduction to the issue is made. The practical part follows, where the design of the whole coupling and especially the newly designed solutions are described in detail. The strength analysis performed deal with the key components that are necessary to ensure safe operation. These analyses can be applied not only for this particular case, but also to gear couplings of different designs, because in principle these calculations do not differ much. In the last chapter, which deals with the dynamic model, all the theoretical assumptions are verified, especially the coupling movements and the applied loads. If the reader deals with the issue of gear couplings, not only in the railway industry, this work presents a comprehensive view of this component. The designed coupling and all performed simulations are really usable in operation.
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Analysis of state of stress in press and shrink fits
Dudek, Milan ; Řehák, Kamil (referee) ; Horníková, Jana (advisor)
This thesis is focused on calculation of overlap in press fit depending on vield strength. There are used methods of analytic elasticity. The counted values are implemented into the technologic process as updated technologic specification. The practical values of overlap depend on exactness of available technology. The evaluation is done at the end of thesis (economic evaluation as well)
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Gear failures
Paška, Josef ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This bachelor thesis is focused on gears. The first part of the thesis informs about the sorting of each type of gears. In the second part, there is a detailed overview of possible gears failures, including their causes, manifestation and their potential solutions for correction. The last part of the thesis handles technical experiment, which aims to performance of vibrodiagnostic of the gear system, tested on the test state. Measured data were subsequently processed by commercially accessible software, where the vibrations of transmission were recorded – firstly at the beginning of measuring when the gears were without damage and afterwards at the end of testing, when the state of damaged teeth was detected.
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Design of a rubber coupling for railway applications
Blach, Jiří ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
The diploma thesis deals with the design and stress-strain analysis of a flexible coupling composed of individual rubber-textile segments. This concept allows the manufacturer to simplify and unify the production thanks to the ability to use a single segment design for multiple coupling configurations and thus leads to a reduction in costs on the part of the manufacturer. From the consumer side this allows only mechanically or chemically damaged segments to be replaced instead of the entire coupling and saves costs for the potential user. The coupling assembly is primarily designed according to the parameters of intercity electric units and locomotives, however, the individual flexible segments are not limited by this use. When designing a coupling assembly, it is necessary to place requirements primarily on the high safety of all components. The operating mode, in which the relative displacement of the input and output shafts can occur, indicates a relatively wide range of transmitted loads which, if any assembly part is improperly designed, can cause problems leading to temporary putting the entire machine/vehicle out of order. The most critical areas of the assembly include the flexible segments, the bolt connections, the strength of the hubs and the spline joint for torque transfer. Last but not least, the requirements for the non-complex production of components must be taken into account, together with the assembly and maintenance without collision of the components and the necessary tools. In order to verify the above-mentioned requirements, stress-strain analyses are performed simulating the variation of operating load conditions. Due to the reduction of hardware requirements and computational time, together with the absence of experimentally measured data of rubber and PES codes, the flexible segments were modelled at a lower level with a reduced material model favouring the tensile properties of PES cords. However, this reduction provides a more conservative approach, as this use causes higher stresses on the steel components of the assembly. Subsequently, a stress analysis of the splined joint is performed. Due to the absence of specific shaft geometry models of commercial motors and gearboxes, a parallel splines were chosen for this purpose and designed according to the specified maximum torque. The last part of the thesis is focused on verifying the tensile properties of an individual flexible segment.
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NVH of electric vehicles
Dufek, Martin ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
There is no internal combustion engine in electric cars and although this is a positive shift in development, it presents new challenges in terms of NVH sources. In these days electric cars seem to be the future of the automotive industry so it is necessary to pay attention to it. In the first part the work is focused on the distribution and description of NVH sources, comparison of their importance in the electric car compared to a car with an internal combustion engine and proposing a possible solution for their damping. The second part of the work is then focused on the importance and implementation of numerical simulations and technical experiments for individual parts of EV used in their development nowadays.
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Design of the Tractor's Cabin Suspension
Rekem, Jakub ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
Diploma thesis is devoted to tractor cabin's suspension. First part of the work consists of the overview of used suspension designs and their various modifications. Next, law requirements for roll-over protective structure are described. Subsequently, the suspension design for small-sized tractor is explored. Law compliance is revised via ROPS procedure simulation using finite element method. In the last part of the work, virtual prototype of agricultural tractor in Multi-body environment is built and it is used for studying the dynamic characteristics of proposed cabin suspension design.
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Design of Unconventional Suspension of Tractor's Cabin
Kuric, Michal ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The Master’s thesis deals with the design of unconventional tractor cab suspension. It contains overview of current conceptions, mensions description of single components, takes closer look at torsion bar calculations and strength analysis. Subsequently, there is dynamic analysis of suspension in the thesis, performed with use of Adams View software aimed at ride over bump. Last section describes strength analysis of whole construction according to OECD methodics with use of numerical simulations in ANSYS Workbench software. Part of the thesis is also complete drawing documentation.
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