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Oil flow simulation in gearbox
Blažek, Martin ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
Lubrication is one of the most important features of designing the transmission and has a great influence on the correct function and long lifetime of bearings and gears of geared transmission. This thesis was focused on the influence of shape of single-speed gearbox case with splash lubrication on oil distribution and churning loss of gear wheel and pinion. Experiences from previous simulation were used to perform oil flow simulations of automotive gearbox test rig. The Particleworks software using the moving particle semi-implicit method was used to simulate and visualize the results. The results of this work can be used as indicators of the influence of the shape of gearbox casing on churning loss and oil distribution, and also as a design idea for appropriate placement of inspection windows in gearbox test rigs.
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Design of the central housing for very low turbocharger support - sideways oil output
Slovák, Jan ; Novotný, Pavel (referee) ; Knotek, Jiří (advisor)
This diploma thesis is about lowering installation height of turbocharger without significant increase of the oil pressure inside the housing at the piston rings. At the beginning of the thesis is research about supercharging and turbocharging, construction and parts that are placed inside a turbocharger. Next chapter is short brief about CFD. Further chapters are about design and changes at the central housing and about simulations. From simulations were the results obtained.
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Numerical simulation of oil flow in the gearbox
Činčár, Vojtěch ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
Component design, subsequent functional verification and possible optimization are an integral part of any production process. Based on increasing customer requirements, the aim is to achieve the smallest possible dimensions and the lowest possible price, while maintaining safety. Incorporating both aspects can be achieved using advanced computational approaches, while this work focuses on the area of flow simulation. Specifically, it deals with the analysis of oil flow in a railway vehicle gearbox using computational fluid dynamics or CFD. The flow simulations were performed using ParticleWorks software, which works with the semi-implicit moving particle method MPS, whose suitability was verified by short analysis works. By monitoring the flow in the workspace, the geometry of the gearbox housing was first verified. However, the critical areas are the bearings whose lubrication quality was analysed using a series of computational models that included the service conditions that may occur. In addition to summarizing the overall evaluation, the paper concludes by outlining a possible suggestion for the potential improvement of bearing distribution and lubrication quality.
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Numerical simulation of oil flow in bearing housing
Zogata, Filip ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This thesis is concerned with the development of a computational model of the bearing node, since in the development of a synchronous generator, great emphasis is placed on the proper design of the bearing node, as this complex component has a direct effect on the overall efficiency of the generator. A large number of engineering experiments need to be used to test on the physical model, but it is also necessary to test using the numerical model, as the production of the prototype itself for testing is very costly, and therefore it is advisable to verify the prototype itself before production by a series of numerical simulations. Another important feature is the possibility to investigate even unfavourable or even extreme conditions, which are already very difficult, sometimes impossible, to test physically in the laboratory, and these numerical simulations can be divided according to several parameters, but in the field of bearing nodes we mainly encounter structural, dynamic, temperature or flow problems. This thesis in particular is focused on establishing a basic overview of computational fluid dynamics in the oil flow domain, while this knowledge is used in practice, as another objective is to develop a numerical model of lubrication of the aforementioned bearing node. However, this is a very complex problem, and therefore a study is first carried out to investigate the key components, and only by gradually adding different elements is the numerical model created in the Particleworks software environment, while a sensitivity study is carried out focusing on particle size. Subsequently, the individual partial results are summarized in the conclusion of this paper.
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Design of the central housing for very low turbocharger support - sideways oil output
Slovák, Jan ; Novotný, Pavel (referee) ; Knotek, Jiří (advisor)
This diploma thesis is about lowering installation height of turbocharger without significant increase of the oil pressure inside the housing at the piston rings. At the beginning of the thesis is research about supercharging and turbocharging, construction and parts that are placed inside a turbocharger. Next chapter is short brief about CFD. Further chapters are about design and changes at the central housing and about simulations. From simulations were the results obtained.
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