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The process of decompression in hydraulic systems of forming machines
Havelka, Milan ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
This thesis consists of two main parts. The first part is a theoretical analysis, or a literary research, it is focused on the physical properties of the fluid, which have direct impact on the decompression. The aim of the second part is to evaluate the measurement of the forging valve and subsequently simulate the issue by means of CFD. The first simulations were performed for the maximal valve stroke and used for the CFD solver setup calibration. The subsequent analyses dealt with possible openings of the valve. In the final chapter the theoretical impact of the liquid compressibility and of the undissolved air is discussed. The results of the thesis can prove useful for the new valve setting in hydraulic circuit or for possible geometry modification.
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Principles and types of hydrodynamic valves
Havelka, Milan ; Himr, Daniel (referee) ; Pochylý, František (advisor)
This thesis deals with characteristics of the most commonly used valves in hydraulic systems. The aim was to create an overview of available features and define their brief characteristics. The emphasis was placed on their function and principles of task performance in a hydraulic circuit. The second part of the thesis is aimed at solving the issue of valves oscillation and subsequent optimization of constants that function as factor dampping.
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The process of decompression in hydraulic systems of forming machines
Havelka, Milan ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
This thesis consists of two main parts. The first part is a theoretical analysis, or a literary research, it is focused on the physical properties of the fluid, which have direct impact on the decompression. The aim of the second part is to evaluate the measurement of the forging valve and subsequently simulate the issue by means of CFD. The first simulations were performed for the maximal valve stroke and used for the CFD solver setup calibration. The subsequent analyses dealt with possible openings of the valve. In the final chapter the theoretical impact of the liquid compressibility and of the undissolved air is discussed. The results of the thesis can prove useful for the new valve setting in hydraulic circuit or for possible geometry modification.
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Principles and types of hydrodynamic valves
Havelka, Milan ; Himr, Daniel (referee) ; Pochylý, František (advisor)
This thesis deals with characteristics of the most commonly used valves in hydraulic systems. The aim was to create an overview of available features and define their brief characteristics. The emphasis was placed on their function and principles of task performance in a hydraulic circuit. The second part of the thesis is aimed at solving the issue of valves oscillation and subsequent optimization of constants that function as factor dampping.
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Comparison of marketing statistic analysis
Havelka, Milan ; Vrabec, Michal (advisor) ; Průša, Milan (referee)
Práce je zaměřena na výzkum trhu rychlo-obrátkového zboží denní spotřeby. Snaží se porovnat dva přístupy k problematice marketingového výzkumu, z pohledu výzkumu maloobchodníků a výzkumu osob, nebo také výzkumu veřejného mínění. Práce je rozdělena do jednotlivých částí, jak každý obdobný výzkum postupuje. V každém oddíle se snažím přiblížit jednotlivá specifika každého výzkumu, snažím se najít společné a odlišné vlastnosti obou výzkumů. Celá studie spočívá v pochopení přístupu k výzkumu obou firem. Jak výzkum postupuje, kde jsou jeho silné a slabé stránky. Záměrem je nalezení společného obou výzkumů. Při pochopení obou přístupů je možnost vytvoření nové báze výzkumu, který vychází z obou přístupů. Také má vymezit využití obou druhů výzkumů v reálném životě firem.
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