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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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Modelling and Verification of Piezoelectric Generator
Lán, Radek ; Singule, Vladislav (referee) ; Hadaš, Zdeněk (advisor)
This master's thesis deals with the development and verification of the model of the piezoelectric generator, incl. determination of its parameters. This mathematical model should be used as a tool for development of new devices, especially for analysis of applicability of available energy source (vibration) and for design of device itself. At first the review of energy harvesting is described deeply. Subsequently piezoelectric generators and the ways how we can model them, are depicted in details. The methodology of parameters estimation and model development is presented in state space or in MATLAB/Simulink environment and applied on the commercial generator Midé V21BL. A device has been made within the scope of the thesis, which can be used as an universal tool in experiments with generator. Finally the model is applied on the analysis of energy yield from man's walk and there is also brief introduction to model modifications.
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Redesign of Vibration Power Generator with Respect to Overall Volume and Weight
Vaněček, Michal ; Dušek, Daniel (referee) ; Hadaš, Zdeněk (advisor)
This work deals with improvement construction already of the vibration power generator design. The improvement his feature and search ideal construction with reference to material, proportions and power. Gain here mechanical properties, to come to what best tune up and development of new construction for improved check out characteristics as is achievement. Tuning up of correct parameters proceed by the simulation and modelling in ANSYS and MATLAB environment.
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Model of composite cantilever with piezoelectric layer
Hons, Richard ; Kšica, Filip (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with the generating electrical energy from vibrations from piezoelectric composite cantilever beam. A review of the piezoelectric materials is made. Then the analytical model of piezoelectric cantilever beam is presented, then the influence of parameters is inves-tigated. Case study with theoretic design of parameters on the specific source of vibration is also provided. Last part is the extension of model for the variable width of layers at cantilever
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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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Oscillatory Power Generator Base on Mechanical Resonant Element
Mihalík, Vlastimil ; Houška, Pavel (referee) ; Hadaš, Zdeněk (advisor)
This work deals with the power supply of wireless sensors. When using a wireless sensor is desirable application of alternative energy sources, because the primary cells or batteries may reduce the extent or length of service of the sensor itself. Ambient energy can be used as a suitable alternative source. This energy must be in an appropriate form, which allows its conversion to electric energy. These appropriate, already used types include: solar en., temperature gradient en., en. of flowing liquids, vibration, etc. The advantage of vibrations is its presence in almost all mechanical systems. One of the possibilities for using the vibration of machine systems for power supply wireless sensors is using the vibration power generator with oscillating component. The generator must be designed so that its resonance frequency coincides with the frequency of vibration in the machine system. This method can be used only if the machinery system vibrations at least partially constant. Another option is to use the vibrations caused by, for example, transit transport, or different step acting factor. In this case, it is desirable that the generator is designed with variable resonant frequency, which can partly be achieved, for example, integrating several oscillating component in the body of generator. After the general analysis of the problem, graduation theses will be concerned with the possibility of use of energy from the short damped oscillation and step impulse. Focusing on a proposal of multi-element structures.
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Solution of flow and formation of vortex structures behind a free-standing pillar
Pluskal, Tomáš ; Pochylý, František (referee) ; Fialová, Simona (advisor)
The instability of the flow and the formation of vortices when surrounding free-standing pillars is a problem that has been solved for a long time. In most engineering applications we try to minimize their influence. However, some newer applications require them to be maximized. This deals with the study of these effects on the public street lamp using computer modelling in the Ansys Fluent and their use for the production of electricity. The information obtained in this way is then used for the design of a vibration generator, which is then used to transform the energy from mechanical vibrations to electricity.
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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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