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Effect of the environment on the dynamic properties of simple parts
Nováková, Soňa ; Himr, Daniel (referee) ; Habán, Vladimír (advisor)
The dynamic characteristics of the object are influenced by the changes of the envi-ronment. The objective of this report is to examine how the changes of the environment influ-ence the dynamic characteristics of the object. The main aim is to compare the natural fre-quencies of the object when suspended and then actuated when being surrounded by air and submerged in water. The object in question is a cylindrical pipe, which was gradually short-ened during the experiment. These changes in size also affected the natural frequencies and the mode shape, which is discussed as well. The results of the experimental modal analysis are compared to calculations run in ANSYS software.
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Exact solution of bending vibrations of beams
Machoň, Matěj ; Habán, Vladimír (referee) ; Havlásek, Michal (advisor)
The bachelor’s thesis deals with the analytical determination of eigenfrequencies and mode shapes of the prismatic beam. The solution is compared with the experimental data and validated. The analytical relations for determination of eigenfrequencies and mode shapes of prismatic beam expressed by basic functions and also by Krylov functions are the results of the thesis.
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Design of orifice plates for steam for high pressure difference
Gajdůšek, Tomáš ; Himr, Daniel (referee) ; Habán, Vladimír (advisor)
The work deals with the design of a system of orifices for high pressure difference. The task of this work is to design a device for controlled discharge of steam-gas mixture from a volume compensator with an overpressure of 12,27 MPa to a tank with an overpressure of 0,02 MPa at a constant mass flow of 40 kg/h. The first part of the thesis contains the theory and also the basic principles of calculations. In the next part of the work, the theoretical properties of flow, such as the speed of sound in wet steam, are determined. This knowledge then serves the main goal of the work, namely to design a system of orifices to release steam-gas mixture from the volume compensator.
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Design of combustion chamber control
Bábíček, Ondřej ; Repka, Martin (referee) ; Habán, Vladimír (advisor)
The subject of the diploma thesis is research of the testing process exhaust clamps. There is a description of a testing device designed to provide simulations of the real operating conditions on an exhaust assembly. The testing device is named the Hot Gas Test Bench. The thesis solves the optimization process of the test setup by determining the optimal fuel ratio, which is given by air flow as oxidizer and flow of natural gas as fuel. The input parameters which provide flow of mentioned fluids are speeds of blowers. In diploma thesis is created a design of initialization and control process to ensure the optional combustion ratio during the entire length of the test.
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Oscillation of the compressible fluid in the cylindrical space
Smolík, Adam ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
The thesis includes two main parts. The first part comprises the theoretical analysis, i.e. literary research. It has been focused on questions regarding compressive pulsation and possible damping elements. The second part focuses on the formation of mathematical model of transition of matrix gas accumulator, the hydraulic set formation by the transition matrix method, the deduction of innate and constrained values and the compressible liquid mode shapes in cylindrical space.
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Non-isothermal flow in relative frame of reference
Koblížek, Martin ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
The aim of this graduation thesis is to investigate whether it is possible to design a fluid machine that would utilize a flow resulting from different densities of processing medium, to generate electricity. The thesis focuses on the determination of relations that have influence on the efficiency. The parametres influencing the degree of efficiency have been analyzed. The aim is to reach the highest possible degree of efficiency. Depending on the results, a suitable processing medium can be selected. Within the scope of the thesis, an experiment had been proposed that verified the ground principle of the non-isothermal flow occurence. In conclusion, the outcomes are evaluated with the view of a prospective further developement of the device.
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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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Self-excited and forced pulsations of liquid in axisymmetric domain
Skopalová, Kristýna ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
The diploma thesis deals with the determination of the self-excited and forced pulsation of the real fluid in the cylindrical area and in the annulus. It also focuses on a case of resonance that has an unfavorable effect on the hydraulic circuit. The result of the thesis is the analytical relations for determination of self-excited and forced shapes of flow and pressure in the closed cylindrical area, for two selected variants of kinematic excitation. In the first variant, excitation is performed in the form of a sinus function. The second variant is expressed as a sawtooth function. A pulsation of the fluid caused by the movement of the body is described for the annulus. Further, in this area, the shapes of fluid pulsation are solved without external excitation.
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