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Road simulator Dyno Tec
Pekar, Marek ; Růžička, Bronislav (referee) ; Mazůrek, Ivan (advisor)
This Bachelor thesis is concerned about reconstruction of road simulators, which is located in Institute of Machine and Industrial Design. At the beginning of this thesis I was interested in overview of current road simulators and undercarriage testers. In the second section I engaged in current state of simulators and I paid attention to various proposals of cover construction and reinforcing of a drum carriage frame. In the next section I have stated a solution for the ideal option of cover construction and a cart attachment. In the conclusion of my bachelor thesis I have compared calculated and experimental values of drum carriage frame frequency. I have also compared the frequency before and after reinforcing of carriage frame of the drum.
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Modal Analysis of the Swirl Turbine Rotor Blades
Pekar, Marek ; Chromek, Lukáš (referee) ; Lošák, Petr (advisor)
The aim of this diploma thesis is to determine and compare modal properties of four swirl turbine wheels, each with a different geometry. Natural frequencies and mode shapes were obtained based on computer modelling using Ansys software and they were compared with experimental modal analysis' results. The computer modelling and the experimental modal analysis were carried out for different boundary conditions and in different environments. The beginning of the thesis is dedicated to a brief overview of literature with similar issues. Then a brief introduction of a dynamics theory is mentioned in which equations of motion for a damped and an undamped single degree of freedom system are derived. The creation of a geometry model which is obtained by a reverse engineering is shown in the second part of the thesis. The geometry model was subsequently used for the computer based modelling of the modal parameters. In the third part an experimental equipment, setting, measurement and processing of data are described. The conclusion of the thesis is dedicated to the comparison of the results obtained by the experimental modal analysis and the computing modelling is presented. Moreover, influence of boundary conditions and influence of the environment on the natural frequencies are evaluated.
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Modal Analysis of the Swirl Turbine Rotor Blades
Pekar, Marek ; Chromek, Lukáš (referee) ; Lošák, Petr (advisor)
The aim of this diploma thesis is to determine and compare modal properties of four swirl turbine wheels, each with a different geometry. Natural frequencies and mode shapes were obtained based on computer modelling using Ansys software and they were compared with experimental modal analysis' results. The computer modelling and the experimental modal analysis were carried out for different boundary conditions and in different environments. The beginning of the thesis is dedicated to a brief overview of literature with similar issues. Then a brief introduction of a dynamics theory is mentioned in which equations of motion for a damped and an undamped single degree of freedom system are derived. The creation of a geometry model which is obtained by a reverse engineering is shown in the second part of the thesis. The geometry model was subsequently used for the computer based modelling of the modal parameters. In the third part an experimental equipment, setting, measurement and processing of data are described. The conclusion of the thesis is dedicated to the comparison of the results obtained by the experimental modal analysis and the computing modelling is presented. Moreover, influence of boundary conditions and influence of the environment on the natural frequencies are evaluated.
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Road simulator Dyno Tec
Pekar, Marek ; Růžička, Bronislav (referee) ; Mazůrek, Ivan (advisor)
This Bachelor thesis is concerned about reconstruction of road simulators, which is located in Institute of Machine and Industrial Design. At the beginning of this thesis I was interested in overview of current road simulators and undercarriage testers. In the second section I engaged in current state of simulators and I paid attention to various proposals of cover construction and reinforcing of a drum carriage frame. In the next section I have stated a solution for the ideal option of cover construction and a cart attachment. In the conclusion of my bachelor thesis I have compared calculated and experimental values of drum carriage frame frequency. I have also compared the frequency before and after reinforcing of carriage frame of the drum.
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