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Strength Analysis of Turbocharger Rotor of Stationary Internal Combustion Engine
Kejval, Dan ; Kudláček, Petr (referee) ; Novotný, Pavel (advisor)
Turbocharger rotors are highly stressed components exposed to significant thermo-mechanical loads. This thesis provides a literature review of this issue concerning turbocharger rotors and focuses on the thermal field analysis and structural analysis of the turbocharger rotor of a stationary internal combustion engine under different steady-state operating conditions, especially under maximum thermo-mechanical load. The analysis was conducted using Ansys Mechanical software, which allows for the calculation of the thermal field as well as the identification and evaluation of critical areas of the rotor using the finite element method. The result of the thesis is an assessment of the rotor's safety, including the risk of loosening the rings preloaded on the rotor shaft.
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Methodology for Identification of Turbocharger Noise and Vibration Sources
Valenta, Otakar ; Kocman, František (referee) ; Novotný, Pavel (advisor)
Malfunctions of machines and machine components are usually accompanied by an increase in vibration and noise. By analysing these vibrations and noises, it is possible to assess their overall condition, diagnose problems and detect possible anomalies and malfunctions. For a successful and practical analysis of turbocharger sounds and vibrations, it is necessary to distinguish turbocharger sounds and vibrations from ambient noise and obtain their characteristics in real time. In the thesis there is performed detailed analysis of the turbocharger noises and vibrations, the sources and reasons for the occurrence of individual vibrations and noises are described, their dependencies on the characteristics of the turbocharger and their allocation to the frequency band. In Matlab Simulink environment, a mobile phone software is developed to provide real-time analysis of the turbocharger sound and to display the probable cause of the turbocharger noises and failure in a graphical interface. The software was tested using sound recordings of Garrett GTD2056 and PBST TCR16 turbocharger sounds. The software is developed using a student version of Matlab and may serve as a foundation for the development of commercial software applications.
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Conversion of a gasoline engine to burn hydrogen
Prchal, David ; Böhm, Michael (referee) ; Drápal, Lubomír (advisor)
The master’s thesis deals with the hydrogen combustion in reciprocating internal combustion engines, a topic that is becoming more important with the planned transition to low-emission mobility. basic physical properties of hydrogen, which are compared with conventional hydrocarbon fuels. Differences in terms of mixture formation, heat release rate, heat transfer, performance, emissions and other operating parameters are described. Based on the information found, a theoretical proposal for the conversion of the 1.5 TSI evo2 gasoline engine to hydrogen combustion is made, with emphasis on achieving sufficient power, a suitable torque curve, low emissions and the lowest possible conversion costs. Data from other hydrogen spark ignition engines are analysed and few different combustion models for hydrogen are developed. A simplified 1D model of the baseline engine is created and modified for hydrogen applications. A new intake cam profile is designed for the high engine load, the approximate size of the required turbocharger is recommended, intake air cooling requirements are determined and minor structural modifications to the cylinder head are proposed. The result meets the stated objectives and demonstrates that modern spark ignition internal combustion engines can be used in combination with hydrogen as a low-emission fuel with low conversion costs.
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Analysis of deformation of control arm of turbocharger mechanism
Dvořák, Martin ; Vobejda, Radek (referee) ; Šebek, František (advisor)
This thesis is of a development character and foremostly focused on operation of a control arm inside of a turbocharger. The thesis is divided into two crucial parts. The first part is a theoretical introduction where general context, regarding function of turbochargers, is processed. The second one is the deformation analysis of control arm of turbocharger mechanism on which the whole thesis is based. The last part is final optimization. The results show that the deformation is similar when spots with low stress are removed. This fact is a key factor to achieve mass reduction for any part when the deformation stays the same.
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Výukový model turbodmychadla silničních vozidel
LIŠKA, Radek
This thesis deals with making 3D model of turbocharger, with possibility of using in teaching. Model will be designed with an attention on details a demonstration of the function itself in program Solidworks, where were all parts and assembly made. The work includes research in the field of air filling of the combustion engines, comparing the differences between atmospheric filling and supercharging. Overall, this work will contribute to better understanding and demonstration of the possibilities of usage in modern combustion engines.
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Thermodynamic 1-D model of the turbocharger of an internal combustion engine
Mrázková, Kristýna ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
Master thesis deals with 1D heat transfer simulation of turbine housing laying emphasis on temperature of exhaust gas leaving the turbine. The thesis covers construction and thermodynamics of turbochargers, exhaust gas aftertreatment and heat transfer simulation software. Then the thesis focuses on exploring turbine housing 3D model discretization, building physical turbocharger model for 1D simulation of exhaust gas output temperature and heat transfer through turbine housing. Heat transfer coefficients were calibrated for transient simulation predicting temperature of output exhaust gas in compliance with NEDC cycle. Results analysis and optimization follow, a suggestion on model integration into the virtual turbocharger system is also included.
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Increasing Performance of Honda 1.6 Engine
Opluštil, Vít ; Beran, Martin (referee) ; Svída, David (advisor)
The aim of this thesis is the description and performance of four-stroke internal combustion engine, an analysis of the options and finding the most effective treatment for a given engine type. In the next section the author deals with computational design turbochargers, chosen for the turbocharged engine modification. Next chapter of work is a design calculation for the choice of the turbocharger, is then constructed a mathematical model of a given engine in the Lotus Engine Simulation software and final results are presented.
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Modelling the Oil Lubrication System of Turbocharger
Breckl, Lukáš ; Hliník, Juraj (referee) ; Novotný, Pavel (advisor)
The diploma thesis contains a research part focused on turbocharger construction, engine lubrication system and turbocharger, basic physical properties of lubricating oils and hydrodynamics. The purpose of this thesis is to create analytical and CFD computational model of turbocharger lubrication system. Output pressures and the loss of specific energy are determined.
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Lubricant Gap Shape Optimization of the Hydrodynamic Thrust Bearing
Ochulo, Ikechi ; Vacula, Jiří (referee) ; Novotný, Pavel (advisor)
The objective of this Master's thesis is to find, using genetic algorithm (GA), an optimal profile for lubricating gap of a thrust bearing of a turbocharger. Compared to the analytical profile, the optimal profile is expected to have minimized friction for an equivalent load capacity. Friction minimization is one way to increase the efficiency of the thrust bearing; it reduces the friction losses in the bearing. An initial problem was given: a thrust bearing with Load capacity 1000 N, inner and outer radii of 30mm and 60mm respectively, rotor speed of 45000 rpm and angle of running surface of $0.5^0$. Lubricant properties were also provided for the initial problem: oil density of $ 840 kg/m^3$, dynamic viscosity $(\eta)$ of 0.01 Pa.s With this data, the numerical solution of the Reynolds equation was computed using MATLAB. To obtain more information, the minimum lubricating gap thickness was also computed using MATLAB. With this information, the shape of the analytical profile, and its characteristics were found. The analytical profile was then used a guide to create a general profile. The general profile thus obtained is then optimized using GA. The characteristics of the generated profile is then computed and compared to that of the analytical profile.
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Design of Turbocharger Bearing for Low Viscosity Oils
Plánka, Jakub ; Dlugoš, Jozef (referee) ; Novotný, Pavel (advisor)
The first part of the thesis describes journal bearings characteristics, their function and lubrication. The second part of the thesis is about a rotor-dynamics issue and how to use numerical and experimental methods for verification of a new bearing design. The practical part of the thesis is focused on analyse a current design of bearings in MBS. In the last part has been made and verified a new bearing design.
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