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Damping of pressure pulsations and noise reduction in pipeline systems
Čepl, Ondřej ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
The diploma thesis deals with pressure pulsations in pipeline system with dynamic muffler. There is presented original geometry of side-branch resonator. Pressure pulsations are solved by a created mathematical model, numerical simulations and verified by an experimental approach. The influence of dynamic and bulk viscosity is involved in derived governing equations. A system of nonlinear equations is solved by genetic algorithm and frequency dependent relationship of bulk viscosity of air is determined afterwards. The correct function of used pressure sensors is tested. The processing of experimental data is performed by the fast Fourier transform with coherent sampling. Finally, a comparison of analytical, numerical and experimental approaches is introduced for different geometric variants of presented muffler.
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Use of the dynamic damper in hydrodynamics
Vrána, Jiří ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
The master thesis deals with the possibility of using dynamic damper in hydrodynamics. Specifically, the assessment of the impact of dynamic damper on the dynamic stability of the fluid system when the system exhibited unstable behaviour prior to damper installation due to self-excited vibration. In the thesis is presented the algorithm for the calculation of pressure and flow pulsations based on the transfer matrix method, the transition matrices for different damper designs variants are derived. Using the algorithm, the effect of a damper placed in a stable and unstable fluid system is solved. The output of this work is software for solution of pressure and flow pulsations in the system with serially arranged hydrodynamic elements created in the MATLAB program.
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Design of dynamic vibration absorber
Hilšer, Pavel ; Musil, Filip (referee) ; Hadraba, Petr (advisor)
Firs part of bachelor's thesis deals with vibrations, main quantities, damping and methods of solving dynamics models. In second part, description of tuned mass damper is carried out. Then tuned mass damper is designed using matlab, simulik for given entity. Values, calculated using this method are compared with finite element method. After that the entity is realized and measured using modal hammer and accelerometer. Calculated values are compared with values measured values.
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Damping of pressure pulsations and noise reduction in pipeline systems
Čepl, Ondřej ; Pochylý, František (referee) ; Habán, Vladimír (advisor)
The diploma thesis deals with pressure pulsations in pipeline system with dynamic muffler. There is presented original geometry of side-branch resonator. Pressure pulsations are solved by a created mathematical model, numerical simulations and verified by an experimental approach. The influence of dynamic and bulk viscosity is involved in derived governing equations. A system of nonlinear equations is solved by genetic algorithm and frequency dependent relationship of bulk viscosity of air is determined afterwards. The correct function of used pressure sensors is tested. The processing of experimental data is performed by the fast Fourier transform with coherent sampling. Finally, a comparison of analytical, numerical and experimental approaches is introduced for different geometric variants of presented muffler.
|
|
|
Use of the dynamic damper in hydrodynamics
Vrána, Jiří ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
The master thesis deals with the possibility of using dynamic damper in hydrodynamics. Specifically, the assessment of the impact of dynamic damper on the dynamic stability of the fluid system when the system exhibited unstable behaviour prior to damper installation due to self-excited vibration. In the thesis is presented the algorithm for the calculation of pressure and flow pulsations based on the transfer matrix method, the transition matrices for different damper designs variants are derived. Using the algorithm, the effect of a damper placed in a stable and unstable fluid system is solved. The output of this work is software for solution of pressure and flow pulsations in the system with serially arranged hydrodynamic elements created in the MATLAB program.
|
|
|
Design of dynamic vibration absorber
Hilšer, Pavel ; Musil, Filip (referee) ; Hadraba, Petr (advisor)
Firs part of bachelor's thesis deals with vibrations, main quantities, damping and methods of solving dynamics models. In second part, description of tuned mass damper is carried out. Then tuned mass damper is designed using matlab, simulik for given entity. Values, calculated using this method are compared with finite element method. After that the entity is realized and measured using modal hammer and accelerometer. Calculated values are compared with values measured values.
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