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Exchange Rates in the Global Crisis: the Role of Fundamentals
Růžičková, Pavla ; Teplý, Petr (advisor) ; Průša, Jan (referee)
This thesis studies the equilibrium real effective exchange rates and the degree of misalignment of currencies. It focuses on the real effective exchange rates of Icelandic króna and Chinese renminbi, with special attention paid to the evolution of these exchange rates in the period of crisis. It identifies key factors influencing the real effective exchange rates of króna and renminbi, calculates their equilibrium level and confirms that these currencies were misaligned in the pre-crisis period. It stresses the impact of real interest rate differential in the case of króna and of sterilization operations applied by the People's Bank of China in the case of renminbi. It further examines whether the relationship between real exchange rates and economic fundamentals was distorted in the crisis. Finally, the thesis provides an insight into whether the crisis led to narrowing the degree of misalignment of renminbi and króna.
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Strain-stress analysis of gear coupling
Vondra, Róbert ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This thesis deals with the contact analysis study of crown gear couplings during the simulation of its working conditions. The toothed coupling transmits high torque, even when the input and output shafts are misaligned due to outside tooth shape. For this reason, it is necessary to design the gear shape correctly. The inherent use of toothed couplings results in a wide range of working speeds and load transfers. This can cause several problems, if the parameters are selected incorrectly. Among the most significant of these is the generation of vibrations during gear engagement, accompanied by noise and the excessive loading of components, such as shafts and bearings. It is not possible to completely reduce uneven running, even with knowledge of the latest trends in the field of gear development. For this reason, it is necessary to eliminate the paths where the vibrations can propagate during the design itself. Inefficient and costly experiments are often used to determine the correct shape of gear teeth. For this purpose, a computational approach to describe a contact pressure on the teeth of couplings at different misalignment and loads is proposed. The model helps to understand the composition of the contact pressure during the working mode of misalignment and its behaviour within the rotation of the gear coupling. The introductory part of thesis presents the current state of knowledge of gear couplings and a description of load distribution issues, regarding the angular misalignment, torque and friction. In the following chapter, three possible approaches to the problem are described - analytical, experimental and computational. The following work offers the introduction and creation of two different computational models, varying in different tooth shape on the hub and the sleeve. Each geometry was subjected to a different load moment, a misalignment of the hub, or the rotation of the gear coupling as a whole. The main monitored parameter was the course of contact pressure in each step, when changing the degree of misalignment or the rotation of the model. Finally, three main sets of contact pressure on the teeth are presented, in connection with the reduced pressure plotted on the toothed rings. There is derivation of results and mutual comparison of each load case. The computation approach in FEM program Ansys Workbench was used to solve the problem.
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Exchange Rates in the Global Crisis: the Role of Fundamentals
Růžičková, Pavla ; Teplý, Petr (advisor) ; Průša, Jan (referee)
This thesis studies the equilibrium real effective exchange rates and the degree of misalignment of currencies. It focuses on the real effective exchange rates of Icelandic króna and Chinese renminbi, with special attention paid to the evolution of these exchange rates in the period of crisis. It identifies key factors influencing the real effective exchange rates of króna and renminbi, calculates their equilibrium level and confirms that these currencies were misaligned in the pre-crisis period. It stresses the impact of real interest rate differential in the case of króna and of sterilization operations applied by the People's Bank of China in the case of renminbi. It further examines whether the relationship between real exchange rates and economic fundamentals was distorted in the crisis. Finally, the thesis provides an insight into whether the crisis led to narrowing the degree of misalignment of renminbi and króna.
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