National Repository of Grey Literature 206 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Condition Simulation in Vehicle Aerodynamics Computation
Čavoj, Ondřej ; Sloupenský, Zdeněk (referee) ; Popela, Robert (referee) ; Píštěk, Václav (advisor)
Several types of discrepancies have been examined between CFD simulations, wind tunnel measurements and real world conditions. The results of different wheel rotation methods show that while stationary approaches can often substitute real unsteady wheel rotation, they can also be very sensitive to the exact angular positioning of wheel rims. Using both measured and computed flow fields, the lower part of wheel wake was identified as a key area, showing differences between rotation methods and sources of simulation errors in general. It was also shown that the level of detail in tyre geometry and its deformation near contact patch do not have a large impact on accuracy. Due to the absence of tyre rotation, the tyre sidewall was identified as an important place of flow separation with large effect on flow field and forces. Angle of attack study confirmed that assessing purely straight-line drag causes its under prediction compared to real-world values. This judgement would however benefit from obtaining data in more adverse conditions compared to those currently available. Finally, tyre radial expansion was investigated, causing a drop in drag with increasing vehicle velocity and altering the flow around the rear bodywork. Ignoring this effect can therefore negatively influence the aerodynamic development of a vehicle.
Low Energy Nuclear Reactions
Paták, Roman ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This bachelor thesis deals with collection and arrangement of information about cold fusion. The introduction describes discovery of the cold fusion, problems associated with it and the response of the scientific community. Furthermore, there are explained the assumed basic conditions of its emergence and some of the experiments are detailly described. Finally, the possible direction of the cold fusion utilization in the future is easily outlined.
Oil fractions as a combustion engine fuel
Rejnuš, Miroslav ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This bachelor’s thesis focuses on the mechanisms of oil production, their composition, processing technology and usage in the automotive industry. The theories of oil production are contained in the first part of the thesis together with the composition and description of the distillation process. Following part deals with individual fractions used in automotive industry, such as gasoline and diesel. The last part includes alternative fuels, especially their history, production or composition.
Car security system
Horváthová, Dominika ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
The aim of my bachelor thesis is to design a safety system for cars, which consists of two main parts. The first is an internal alcohol lock that prevents a person from driving under the influence of alcohol. The second part deals with the design of a computer unit, which in case of a car accident sends all important information about the crew to the nearest rescue.
Identification of multiparameter rheological models of automotive elastomeric components
Svoboda, Jan ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
In this thesis, the goal is to describe behavior of a elastomers used in automotive indrustry. We will approximate nonlinear dynamic values using combination of linear reological models. Then we will determine these linear values using optimization algorithms.
Petrol seven-cylinder radial aircraft engine
Horváth, Tomáš ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
The aim of this diploma thesis is to propose a drive train of a seven-cylinder radial engine, including strength analysis of selected components. The basic parameters of the engine cylinder are based on the Škoda 1.2 HTP 12V 47kW AZQ engine.
Petrol five-cylinder radial aircraft engine
Donutil, Jan ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This thesis deals with configuration of radial five-cylinder engine with attention to crank mechanism. Covered topics are motion of crank mechanism with articulated connecting rod, force analysis and balancing of inertial forces. The second part discusses FEM analysis and calculation of safety factor of selected component.
Petrol three-cylinder radial aircraft engine
Břečka, Marek ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
The purpose of this thesis is to design a powertrain of petrol three-cylinder radial aircraft engine with the main parameters specified (bore, stroke, etc.), balancing inertia forces, stress analysis and determining of fatigue of the selected parts.
Six cylinder diesel engine for commercial vehicles
Pulava, Oleksandr ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
The aim of this diploma is to design a crankshaft for a six-cylinder commercial vehicle, which is one of the unified motors. The main parts are the design of the crankshaft configuration, the crankshaft balancing method for forces and moments, the crankshaft design documentation, and the crankshaft strength verification. The design of torsional vibration damping characteristics is also made and its effect on torsional vibration and crankshaft strength is determined.
Compressor elastic mounting on frame
Novák, Vít ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
Piston compressor, measurement, vibrations, FFT

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