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Rotor dynamics of asynchronous generator fast fixed with water turbine
Blažek, Petr ; Donát, Martin (referee) ; Dušek, Daniel (advisor)
This Master’s thesis deals with rotordynamics analysis of asynchronous generator rigid coupling with water turbine shaft. The purpose of this thesis was to determine influence of connection of generator with water turbine by rigid coupling to reactions in bearings. This problem was solved in two ways. The first option focused on model without influence of inaccuracies whereas there were inaccuracies included in the second option. The problem was solved by computational modeling by software Ansys.
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Planar frames and curved bars. Study of the significance of the influence of normal and shear forces on deformation characteristics of the centerline
Donát, Martin ; Fuis, Vladimír (referee) ; Suchánek, Miroslav (advisor)
The Aim of this thesis is to write up the relevancy of particular resultant inner effects (further denoted as RIE) on the central line bars and plane frames deformation. The relevancy of particular RIE on the choice deformation characteristic bars in dependence on the ration of central line length and characteristic cross-section proportions, support type and bar load is analyzed in the sample examples. We solve a problem whether a bent bar should be comprehended as a shall bent or as a forte bent bar and we also analyze how does the stiffness shift influence the fractional bar deformation. When solving the sample examples we suppose that the bar expectations are fulfilled. When determining the central line deformation we use the Castiglianano’s theorem because it enables to include supplies of particular RIE.
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Analysis of mechanical behaviour of synchronous generator
Donát, Martin ; Hadaš, Zdeněk (referee) ; Dušek, Daniel (advisor)
This Master’s thesis deals with analysis of mechanical behaviour of the synchronous generator and assessment of the possibility of reducing the mass of the frame of the generator. The aims of this work were: to perform the stress-strain analysis and modal analysis of the required model of the synchronous generator, to assessment influence of single part of the frame of the generator over its stiffness and design construction modification of the frame of the generator, which reduce its mass.
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Modelling of Dynamic Tasks in SolidWorks Motion
Podzemný, Zdeněk ; Donát, Martin (referee) ; Hadaš, Zdeněk (advisor)
Aim of this thesis is creation 3D models of dynamic tasks (which were solved in subject Dynamics) in SolidWorks software and simulation in Motion module, which is part of SolidWorks Professional. Models can be used as a tutorial or educational help in Dynamics. The thesis is begun by description of Motion module and it's functions, then analytical methods of solving dynamic tasks are examined and after that is made a description of simulation in particular tasks together with simulation results. Almost every task is analytically solved and results are compared with simulation. In the conclusion of this thesis are discussed all results and simulations.
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Modelling of dynamics systems with multi degrees of freedom
Ondra, Václav ; Donát, Martin (referee) ; Dušek, Daniel (advisor)
The aim of this work is for a dynamic system with multiple degrees of freedom to assemble and solve the equations of motion. In the beginning of work are summarized the basic knowledge about the dynamic oscillating systems, their distribution, method of mathematical description etc. In the following part of work are for the given set of particles assembled equations using Lagrange equations of the second kind. The solution of equation is made in mathematical system MAPLE for frequency domain. To determine the position of particles in time was used MATLAB. Research results are graphs of amplitude and frequency characteristics and graph of positions of particles in time. There is discussion on the influence of systems parameters on oscillation. The conclusion is a comparison of analytical solution with the solution of finale elements conclusion in ANSYS.
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Creation of database of stator core stiffness of rotational electrical machines
Podzemný, Zdeněk ; Donát, Martin (referee) ; Dušek, Daniel (advisor)
In this thesis is wrote up a complete procedure of stator core stiffness determination using finite element method (FEM), subsequently, the stator core stiffness database was created according to this procedure. In the next chapter is carried out a sensitivity analysis of one chosen stator core, which led to identifying parameters that affected its stiffness the most. Finally, a modal analysis of one synchronous machine was performed using FEM, in order to determine the effect of stator core stiffness on modal characteristics of the machine. Several modal shapes and corresponding natural frequencies were computed in this analysis, then only a few shapes with the highest core effect were chosen and compared.
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Stress strain analysis of a synchronous generator
Majdič, Petr ; Donát, Martin (referee) ; Dušek, Daniel (advisor)
This master thesis deals with an impact of particular static and dynamic forces and temperature strain on horizontal synchronous generator. In connection with this, a stress distribution in construction and an assessment of security to terminal state of flexibility and weariness is being solved together with finding the most critical places on horizontal synchronous generator.
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Analysis of vertical synchronous generator modal properties
Kornherr, Milan ; Donát, Martin (referee) ; Dušek, Daniel (advisor)
This Master´s thesis deals with the analysis of modal characteristics of the vertical synchronous generator. The goal of this work is to determine influence of individual parts of the generator on modal characteristics. Another part of this thesis contains analysis of different variants for storaging the generator and also structural modifications, which lead to the improvement of the modal properties. For modelation was used cumputional modeling in ANSYS.
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Complex Analysis of Modal Properties of Rotating Electrical Machines
Donát, Martin ; Vlach, Radek (referee) ; Žiaran,, Stanislav (referee) ; Dušek, Daniel (advisor)
This dissertation thesis deals with the computational modelling of the dynamic response of the rotating electrical machine structure on the application of the magnetic forces. Apart from the dynamic response of the ideal symmetrical machine, the influence of the air gap eccentricity on the dynamics response is studied in this work. A basic type of the air gap eccentricity, which is caused by eccentric mounting of the rotor pack on the shaft of the rotor, is considered. The calculations the dependence of the magnetic forces on the time and a misalignment of the rotor pack are performed as first. The computational model of the magnetic field of the rotating electrical machine, which is based on solution of the electromagnetic coupled field analysis by finite element method, is used for this purpose. An analysis of the influence of the unbalanced magnetic pull and the stiffness of some parts of the machine on the modal properties of the machine is performed in the second part of this thesis. A third part of this thesis is focused on the calculation of the dynamic response of the machine during the steady state operation of the machine and the influence of the rotor pack misalignment on the dynamic response is studied. The obtained results showed that the tangential components of the magnetic forces, which act on the stator pack, excite significant torsional vibration of the stator. Besides the vibration of the stator of the machine, the influence of the rotor pack misalignment on the sound power of the machine, vibration of the rotor, loads of rotor bearings and air gap eccentricity is studied in this thesis.
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