|
|
Experimental study of journal bearings dynamics
Tkadlec, Josef ; Vimmr, Jan (referee) ; Omasta, Milan (advisor)
This work deals with experimental analysis of fluid film instability in rotor bearing systems stored in hydrodynamic plain bearings with focus on bearing surface modification. The experiments were performed on a journal bearing dynamics simulator. The aim was to determine the influence of individual operating parameters on the occurrence and course of turbulence instability. The emphasis here was on the effect of surface micro textures. The work also included the preparation of textured samples. Experiments were divided into experiments monitoring the influence of temperature, pressure, bearing geometry and surface modification. The output of the individual experiments were the values of the threshold speed of formation and termination of instability or the magnitude of the amplitude depending on the above described parameters. These values were plotted in graphs. This data was then confronted with previously published articles. The results showed that instabilityin rotor systems is very sensitive to temperature, pressure and bearing geometry changes. The fundamental influence on the unstable behavior of the rotor system has been demonstrated by the use of textured surfaces, where the threshold speed was significantly shifted to a higher speed range compared to the non-textured bearing.
|
|
| |
|
|
Simulation of the Drive with Synchronous Machine and its Evaluation using a Real System
Tkadlec, Josef ; Veselý, Libor (referee) ; Václavek, Pavel (advisor)
Práce se zabývá modelováním PMSM, jeho parametry a jejich získáváním. Dále je v práci popsán model měniče beroucí v potaz dead-time efekt. Tyto modely jsou implementovány společně s dalšími bloky v prostředí Matlab/Simulink a dohromady tvoří knihovnu pro vektorové řízení motorů FSL_MC_TOOL. Součástí práce je také měření a identifikace parametrů skutečného PMSM. Dále byly vytvořeny příklady simulací, v nichž je použit motor s těmito parametry a vyhodnocena přesnost simulace. Tímto jsou simulace ověřeny na reálném systému.
|
|
|
Analytical model of gun firing mechanism dynamics
Tkadlec, Josef ; Strecker, Zbyněk (referee) ; Šperka, Petr (advisor)
This bachelor thesis is devoted to creation of the analytical model of the dynamics of gun firing mechanism, that is used for design of individual parts of the mechanism, allowing the primer to be initiated properly. This analytical model has been verified by experimental measurement of the real mechanism operation from Brno Combo shotgun using a high speed camera Vision Research Phantom v710. In addition, the minimal energy, needed for initiation of FOCCHI 616 (.209 TYPE) primer, was experimentally measured using the test device and the high-speed camera. The results of experimental measurement of minimal initiation energies were compared with the experimental data from Sellier & Bellot primer producer.
|
|
| |
|
|
Experimental study of journal bearings dynamics
Tkadlec, Josef ; Vimmr, Jan (referee) ; Omasta, Milan (advisor)
This work deals with experimental analysis of fluid film instability in rotor bearing systems stored in hydrodynamic plain bearings with focus on bearing surface modification. The experiments were performed on a journal bearing dynamics simulator. The aim was to determine the influence of individual operating parameters on the occurrence and course of turbulence instability. The emphasis here was on the effect of surface micro textures. The work also included the preparation of textured samples. Experiments were divided into experiments monitoring the influence of temperature, pressure, bearing geometry and surface modification. The output of the individual experiments were the values of the threshold speed of formation and termination of instability or the magnitude of the amplitude depending on the above described parameters. These values were plotted in graphs. This data was then confronted with previously published articles. The results showed that instabilityin rotor systems is very sensitive to temperature, pressure and bearing geometry changes. The fundamental influence on the unstable behavior of the rotor system has been demonstrated by the use of textured surfaces, where the threshold speed was significantly shifted to a higher speed range compared to the non-textured bearing.
|
|
|
Analytical model of gun firing mechanism dynamics
Tkadlec, Josef ; Strecker, Zbyněk (referee) ; Šperka, Petr (advisor)
This bachelor thesis is devoted to creation of the analytical model of the dynamics of gun firing mechanism, that is used for design of individual parts of the mechanism, allowing the primer to be initiated properly. This analytical model has been verified by experimental measurement of the real mechanism operation from Brno Combo shotgun using a high speed camera Vision Research Phantom v710. In addition, the minimal energy, needed for initiation of FOCCHI 616 (.209 TYPE) primer, was experimentally measured using the test device and the high-speed camera. The results of experimental measurement of minimal initiation energies were compared with the experimental data from Sellier & Bellot primer producer.
|
|
| |
|
| |
|
|
Simulation of the Drive with Synchronous Machine and its Evaluation using a Real System
Tkadlec, Josef ; Veselý, Libor (referee) ; Václavek, Pavel (advisor)
Práce se zabývá modelováním PMSM, jeho parametry a jejich získáváním. Dále je v práci popsán model měniče beroucí v potaz dead-time efekt. Tyto modely jsou implementovány společně s dalšími bloky v prostředí Matlab/Simulink a dohromady tvoří knihovnu pro vektorové řízení motorů FSL_MC_TOOL. Součástí práce je také měření a identifikace parametrů skutečného PMSM. Dále byly vytvořeny příklady simulací, v nichž je použit motor s těmito parametry a vyhodnocena přesnost simulace. Tímto jsou simulace ověřeny na reálném systému.
|
guest ::
RSS feed.