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Aplikace evolučního algoritmu na optimalizační úlohu vibračního generátoru
Nguyen, Manh Thanh ; Kovář, Jiří (referee) ; Hadaš, Zdeněk (advisor)
This thesis will deal with the use of artificial intelligence methods for solving optimization problems with multiple variables. A theorethical part presents problems of global optimization and overview of solution methods. For practical reasons, special attention is paid to evolutionary algorithms. The subject of optimization itself is energy harvester based on a piezoelectric effect. Its nature and modeling is devoted to one chapter. A part of the thesis is the implementation of the SOMA algorithm for finding the optimal parameters of the generator for maximum performance.
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Proposal of piezo-generator inside button
Kučera, David ; Houška, Pavel (referee) ; Hadaš, Zdeněk (advisor)
This bachelor’s thesis deals with proposal of piezo-generator inside button. There are described types of piezo-generators, explained piezoelectric effect, types of piezoelectric material with focus on piezoceramics. The properties of piezoelectric ceramics are described. Proposal of piezo-generator inside button is described at the end of this thesis.
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Vibrational energy harvesting demonstrator
Uhliar, Marek ; Götthans, Tomáš (referee) ; Mrnka, Michal (advisor)
The aim of the thesis is to solve the problem of energy collection from vibrations, transformation into electric energy, which can be suitably used by the end device. In the next section, the reader is acquainted with possible circuits that can be used to process the collected electrical energy. The last part of the thesis deals with the design of the auxiliary circuits for energy collection and with the design of the demonstration device, which will use the converted energy to measure the air temperature and humidity. The measured values will then be displayed on the LCD.
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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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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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Flexible generators of electrical energy
Tesařová, Tereza ; Holcman, Vladimír (referee) ; Tofel, Pavel (advisor)
This bachelor thesis is focused on actual research part of energy harvesting technologies – flexible electrical generators, which mean the special generating of electricity using specific flexible materials. The net charge result is affected by the incidental mechanism to transform certain energy form into electrical power and is influenced of material range, which determines what will be harnessed as a source of energy. The energy harvesting is aiming at producing alternative and efficient ways instead of harmful and strained manufacture processing.
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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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Flexible generators of electrical energy
Tesařová, Tereza ; Holcman, Vladimír (referee) ; Tofel, Pavel (advisor)
This bachelor thesis is focused on actual research part of energy harvesting technologies – flexible electrical generators, which mean the special generating of electricity using specific flexible materials. The net charge result is affected by the incidental mechanism to transform certain energy form into electrical power and is influenced of material range, which determines what will be harnessed as a source of energy. The energy harvesting is aiming at producing alternative and efficient ways instead of harmful and strained manufacture processing.
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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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