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Power inverter with active rectifier
Dvořáček, Daniel ; Červinka, Dalibor (referee) ; Rubeš, Ondřej (advisor)
This thesis deals with the principle of functions, constructions and possibilities of the control of inductions machines. There is also briefly described the issue of the power transducers from which the frequency converters are coming out, as well as is described here the process of designing of the power part of the converter.
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Design of vibration energy harvester with blade joint
Beňo, Martin ; Hadaš, Zdeněk (referee) ; Rubeš, Ondřej (advisor)
This bachelor thesis deals with the design of vibration generator with blade joint. Firstly, its main aim is to design a working vibration generator, and secondly is to entice the reader to continue on with reading. Such a vibration generator is a handy, inexpensive to manufacture, and especially very simple. The basic design element of the vibration generator is oscillating frame connected to the blade joint and is the carrier of the magnets. The electrical part of the generator consists of a magnetic circuit and coil on the static bracket. Oscillating frame with magnet creates a changing magnetic field and induces voltage in the coil. For the design of the construction was used the program Inventor. For the calculation of the magnetic circuit has been selected, the program FEMM controlled by MATLAB. For the calculation of the static and the dynamic analysis was chosen the program ANSYS.
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Piezoelectric vibration energy harvester
Klásek, Matyáš ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
The first goal of this bachelor’s thesis is to give an overview of piezoelectric materials and their utilization in energy harvesting applications. The second goal is to examine the effect of altering model parameters on generated power and natural frequency of the system using analytical model of a bimorph piezoelectric cantilever beam in MATLAB/Simulink.
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Vibration Harvester for Aircraft Applications
Rubeš, Ondřej ; Vetiška, Vojtěch (referee) ; Hadaš, Zdeněk (advisor)
This thesis is focused on modification of a design proposal of a vibration energy harvester for autonomous aircraft applications. Vibration energy harvester is mechanism, which converts vibration energy to electric energy. Its main parts are oscillating mass, magnets and coil for electromagnetics induction. The thesis is consisted of simulations of magnetics circuits, creating 3D model of harvester and simulations of oscillations with parameters from 3D model, magnetics simulations and with input sample of exciting vibrations.
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Analysis of Vibration Energy Harvester with Free Moving Mass
Moravčík, Patrik ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
This thesis is focused on analysis of piezoelectric harvester, with unattached mass, finding out best combinations of masses, which would be the best for desing this type of generator. Adding different masses on this beam, we can see different responses to the sinusoidal harmonical signal excitation as well as the pulsating signal. The resulting most suitable combinations will also be subjected to simulations with the piezoelectric layer, the results of the output voltage and power evaluated.
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System for testing yarn quality sensors
Kubeš, Filip ; Knobloch, Jan (referee) ; Rubeš, Ondřej (advisor)
In the current situation, there are big demands for a textile production and the yarn quality. For that reason it is necessary to test the quality of the yarn, using sensors such as sensor Q30 of the Rieter company. The main goal of this thesis is to design and create a station for testing of the mentioned sensors in their development. Movement of the tested yarn is provided by three stepper motors made by the Standa Ltd. For connecting of the tested yarn and the sensor to the system, several metal parts were designed and created. Finally an app was designed to control the system. It was created using a C# programming language in the .NET framework in the Visual studio IDE. As part of the application, there were created libraries containing control commands for the controller. These libraries are usable for a different projects too.
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Design of planar electromagnetic generator for sea drifter
Almáši, Matej ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
Unfixed buoys are an important part of sea and sea current monitoring. It is important that these buoys display a great amount of self-sufficiency. Electronic components of the buoy are conventionally powered by batteries, however there is an attempt to replace them with more self-sufficient sources that utilize energy from sea waves. For this purpose, so called “energy harvesters” that utilize electro-mechanic conversion are being developed. This thesis is focused on raising the power output of an energy harvester that is currently being developed at the FME BUT by finding the ideal parameters of the generating coil. An electro-mechanic model was developed which was then utilized to perform a sensitivity analysis. The result of the analysis was a set of coil parameters that resulted in the greatest power output. Subsequently, a coil prototype was manufactured, and the power output was measured experimentally. The root mean square value of the generated power was PRMS = 152.7 µW, which less than expected by the used model, however the coil winding didn’t fill up the space dedicated to it to the expected degree.
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Equivalent electromechanical circuits for modelling of dynamic systems
Legerský, František Jozef ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with solving and modelling of dynamical systems using electromechanical analogy. A review of the use of electromechanical analogy of systems is made. Then a mechanical model of a piezoelectric beam is described by using differential equations and subsequently an equivalent circuit is made by using a voltage analogy, in which the power is simulated. A mechanical model and its equivalent circuit are made for the electromagnetic vibration generator using current analogy. The last part of the work is the modelling of complex piezoelectric and electromagnetic models and the influence of body weights on the vibrations.
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Analysis of model operation of multi-degree-of-freedom energy harvester
Witassek, Tomáš ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
The first part of this bachelor’s thesis is an overview of vibration energy harversters with multiple degrees of freedom. Several options of broadening the usefull frequency bandwidth thanks to multiple degrees of freedom are described in the overview. The following part is a model in Matlab & Simulink analyzing behaviour of a vibration-powered generator with a harmonic excitation and another one with a real excitation. The main focus is on the output electrical power and energy in relation to geometrical parameters and electromagnetic damping.
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