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Influence of rotating wheels on vehicle aerodynamic characteristics
Oslizlo, Aleš ; Svída, David (referee) ; Vančura, Jan (advisor)
The diploma thesis is focused on computational examination of influence of boundary condition settings in CFD software on the final aerodynamic characteristics of a vehicle. The flow analysis is carried out around a vehicle with and without the rotation of the wheels and along with the stationary and moving road. Furthermore, there is demonstrated the method of the CFD model composition and there is described the influence of rotating wheels on vehicle aerodynamic characteristics.
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Vortical structures with cavitating core
Švaňhal, Radek ; Štigler, Jaroslav (referee) ; Rudolf, Pavel (advisor)
The master's thesis focuses on vortical structures with cavitating core, which might develop in Francis turbines at non-optimal discharges in a form of unstable vortex cord. The cavitating vortex core is to be generated in a lab by flow rotation and a convergent nozzle. The objective of this thesis is to compare experimental results with mathematical model of pressure drop in vortical flow and with numerical calculation in Fluent based on finite volumes method. Other objective is to messure high frequency pressure vibrations generated by cavitating vortex core and spectrally analyze the data.
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Migration to selected EU countries: Labor market integration
Kaclíková, Roberta ; Šaroch, Stanislav (advisor) ; Němcová, Ingeborg (referee)
The aim of this master thesis is to analyse the labor market of European Union and its certain countries in relation to the immigration with the backgound of various social welfare models. The paper is analysing the topic of labor market of European Union, integration of immigrants on this market, with focus on economies and labour markets of Sweden, United Kingdom and Germany as countries with high level of immigration that are representing three different social welfare models, such as Nordic model, Liberal model and Conservative model. The main objective of this thesis is the analysis of labor markets in selected countries of the European Union in relation to immigration and their subsequent comparison using the background of different social welfare models. The result is the evaluation of effectivness of the various social models based on statistical data, acquired knowledge and performed comparisons. The thesis is divided into four chapters and contains 13 tables and 8 charts.
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Kinematic model of blade rotating mechanism of turbocharger
Tomanec, Filip ; Zháňal, Lubor (referee) ; Porteš, Petr (advisor)
This master’s thesis deals with kinematics model of blade rotating mechanism of turbocharger, which is called as VNT (“Variable nozzle turbine”). The first section treat of turbochargers generally, why we use them, summary description of construction and parts. In the next section deals with supercharge control, about types of controlling and theirs principles, of their vantages or disadvantages and comparison. Following section is about building kinematics model in software ADAMS. First step is analytics solving of mechanism, because it was necessary for parametric model. After this is described main model building. In the last section is kinematics model used on real turbocharger for checking results.
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Design of manipulation table for workpiece rotating
Horák, Jiří ; Opl, Miroslav (referee) ; Pavlík, Jan (advisor)
This master’s thesis deals with the design of the manipulator for rotating objects, especially workpieces, semifinished products, or complete products around horizontal axis. It’s the manipulator for objects where is needed change orientation during production process. This thesis describes step by step construction of individual components of the manipulator and calculations of propulsive units. At the beginning the conveyor roller with propulsive unit is designed. The next step is construction of scissor lift table and choice of the propulsive unit. There is also made FEM analysis for the scissor mechanism. The next unit is aimed to the construction and computation of rotating and telescopic jaw. Then hydraulic circuit with computation of the propulsive unit is designed. As the final step the appropriate type of sensors are chosen and the step diagram of the manipulator is made. The manipulator is designed in the 3D model program and there are also made some assembly drawings.
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Fluid flow modeling in rotating engines
Joch, Lukáš ; Šen, Hugo (referee) ; Pospíšil, Jiří (advisor)
This thesis deals with modelling of flow in rotating engines. The introduction of the thesis discusses the principles of CFD modelling, such as mathematical flow model, numerical solution methods and model of turbulence. Next, the thesis is engaged in possibilities of a calculation model creation and its setting for a used model of steam turbine regulatory stage. The last part contains evaluation of calculation models and their comparison with different input parameters, regarding the fact that the aim is to get the most suitable setting for reaching the peak efficiency.
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The model of adaptive behavior for the development of Czech assessment scales for children
Chadimová, L. ; Urbánek, Tomáš ; Seifert, M. ; Ivanková, K.
We introduce results of cluster analysis conducted during the development of Czech assessment scales of adaptive behavior in children and adolescents. Within the frame of National Institute of Education we organized the group of experts on the topic of adaptive behavior, both from the academical and practical areas. Every member of the expert group obtained 300 items inspired by local or foreign methods of adaptive behavior assessment. The experts were instrued to cathegorize the items, which they found meaningful with regard to the construct of adaptive behavior and its manifestation on the Czech background. Based on results we compiled consequent model of adaptive behavior, that becomes the base structure for newly developed assessment scales. We compare this structure with the model of adaptive behavior used by DSM-V.\n
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Thermal Effects in Physics and Dynamics of Small Bodies of the Solar System
Čapek, David
Thermal Effects in Physics and Dynamics of Small Bodies of the Solar System Abstract of the Ph.D. thesis \s David Capek It has been shown, that the thermal effects are very important in the dynamics of small Solar System bodies. A phenomenon which is known as the Yarkovsky effect is able to secularly change the semimajor axis of an orbit, while the YORP effect affects the rotation state of a body. The Yarkovsky effect and the YORP effect were previously calculated with many constraining assumptions like spherical shapes of asteroids, circular orbits, small variations of the surface temperature, principal axis rotation, constant thermal parameters, etc. We developed a sophisticated numerical model of the Yarkovsky/YORP effect without such simplifications. With this model, we have been able to describe the shape, the orbit, the rotation and the thermal behaviour of an asteroid in a very precise way. The YORP effect was studied on a sample of artificially generated shapes, roughly resembling Main Belt asteroids, and also on several shapes of real asteroids. The depen- dence of YORP on the obliquity and the thermal parameters of the surface were studied (Vokrouhlicky and Capek, 2002; Capek and Vokrouhlicky, 2004). A wide variety of pos- sible YORP evolution paths of the spin state was found. The possibility of...
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