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Řezníček, Pavel ; Dlugoš, Jozef (referee) ; Zháňal, Lubor (advisor)
This diploma thesis deals with possibility of using a mobile phone to measure vehicle dynamics and determine the accuracy of this measurement. In the research part, it is first mentioned what methods are used to produce sensors for mobile phones. Next, a description of individual sensors that can be used for vehicle dynamics measurement, the principle by which the sensors record measured values and their inaccuracies. The practical part shows with which professional device the accuracy of the mobile phone is compared, how data can be collected from both devices and how the comparison measurement was performed. This section also describes the ways in which the measured data of the mobile phone can be improve for better accuracy, and finally the comparison of the measured values from both devices from different points of view.
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Computational analysis of operational deformations of the diesel engine cylinder unit
Zalibera, Tomáš ; Řehák, Kamil (referee) ; Dlugoš, Jozef (advisor)
Submitted diploma thesis deals about operational deformations in the cylinder unit of turbocharged diesel engine used in commercial vehicles. Introductory part analyses combustion engines computational modelling based on finite element method. The next step is the creation of computational models for thermal-structural analyses of the piston and engine block. In order to determine material characteristics of the head gasket, experiment is performed on the OEM gasket to determine its real behaviour under compressive load. The results shows strong nonlinear behaviour which justifies the decision of making such an experiment in the first place. The results of computational models are radial deformations of the piston and cylinder liners during load conditions. The last chapter deals with the application of these results to an advanced computational piston assembly dynamics model.
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The pistons of four-stroke engines and their application
Jelínek, David ; Fojtášek, Jan (referee) ; Dlugoš, Jozef (advisor)
This thesis deals with historical development of pistons for four-stroke combustion engines and their application for machines using both diesel and petrol fuel. The beginning explains how the four-stroke combustion engines works and what role the piston plays that. The following is about the description of the individual parts of the piston, the important attribute the piston should have and how the piston is loaded by the forces in the combustion process. The next part deals with the historical development of the piston, especially in the first half of the 20th century, when the combustion engines had the greatest rise. In this chapter are summarized the design methods, the types of material and the Wankel engine. Below is a summary of the modern methods of producing pistons, their types of use, types of materials, coatings and cooling methods.
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Development of combustion engine turbochargers
Franc, Vladimír ; Dlugoš, Jozef (referee) ; Řehák, Kamil (advisor)
This bachelor's thesis is a research project focused on the development of turbocharger technology for diesel and gasoline engines. The work is divided into four chapters. The first chapter is a general description of the construction, basic principles and key components of turbochargers. Next, the history of turbocharging will be briefly summarized. The third chapter is devoted to particular construction methods and finally new development trends will be discussed too.
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Scooter testing bench
Kostka, Marek ; Dlugoš, Jozef (referee) ; Zháňal, Lubor (advisor)
This Master’s thesis deals with measuring of acting forces from rider to footbike during the ride, followed by the construction of test stand to draw an equivalent load. Measurements and subsequent analysis of acting forces from the rider to the footbike were made. These results were then used for complete design of the test stand. The frame of the test stand was subdued to a stress analysis. A complete automatic control system, including a pneumatic control circuit, was also designed. The proposed automatic test stand was then manufactured and put into operation.
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Turbocharger Rotors using Rolling Bearings
Šárovec, Marek ; Dlugoš, Jozef (referee) ; Novotný, Pavel (advisor)
The main purpose of this diploma thesis is to design turbocharger rotor using rolling element bearings. The diploma thesis is compiled from two specialized search parts dealing with turbocharger rotor and rolling element bearing computation, respectively. The application of the particular rotor using the multi body system Adams – View is described in the following chapter. In the last chapter, one can find the comparison between rotor using bearing with steal and hybrid ceramic rolling element. Also, there is compariosn between rolling element bearing and journal bearing. In the maximum rotor speed, the decrease of more than 50 % in power loss, due to usage of rolling element bearing, resulted from this comparison.
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Radial Slide Bearing Analysis Using Advanced Computational Methods
Orbán, Tomáš ; Dlugoš, Jozef (referee) ; Novotný, Pavel (advisor)
This master’s thesis introduces a slide bearing analysis using the MBS software tool of FEV Virtual Engine, including real surface topography based on 3D roughness measurements. The first half of the thesis gives a brief overview about gasoline combustion engines, slide bearing usage in engines, slide bearing construction and about essential approaches for the characterization of elasto-hydrodynamic behavior. In the second half, the process of model building, rough surface measurement and preparation of analyses are described. At the end of this thesis, the results of the analyses are shown and discussed.
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Determination of Hydrogen Mixture Influence on Internal Combustion Engine
Roušar, Jiří ; Dlugoš, Jozef (referee) ; Novotný, Pavel (advisor)
The aim of the Bachelor thesis is comparing a hydrogen combustion engine with conventional combustion engines and comparing the advantages and disadvantages of the hydrogen combustion engine. The features of hydrogen are introduced, as well as its production, transportation and storage. The work contains a research of construction designs of a conventional engine modifications to the hydrogen engine. The realisation of technically possible modifications to the conventional engine is included in the thesis.
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Design of thread connection of turbocharger turbine wheel and rotor shaft
Oboňa, Matúš ; Novotný, Pavel (referee) ; Dlugoš, Jozef (advisor)
This diploma thesis is focused on the concept of threaded connection of the turbine wheel and shaft. At the beginning are described current welding methods of the turbine wheel and shaft connections as well as methods of the compressor wheel and shaft connections. Four possible concepts were designed and evaluated, and the best concept was chosen. For this concept was calculated tightening torque and concept was evaluated in terms of turbocharger operating conditions.
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Variable turbocharger turbine geometry
Řezáč, Vojtěch ; Dlugoš, Jozef (referee) ; Drápal, Lubomír (advisor)
This thesis is dedicated to design of turbocharger’s boost pressure regulation using variable turbine geometry. In this thesis are mapped commonly used methods of turbine flow regulation. With respect to all information collected there were created new designs which were compared between each other and with currently used Garrett VNT system focusing on performance, flow area and operating forces which were obtained using advanced numerical methods in ADAMS View software. At the end of this thesis are presented benefits and drawbacks of each design. In the very end are presented next steps in further development.
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