|
|
Magnetic Energy Harvesting Device for Low Excitation Vibration
Szabó, Hugo ; Singule, Vladislav (referee) ; Rubeš, Ondřej (advisor)
This bachelor theasis is focused on a concept of a magnetic energy harvesting device for low exitation frequencies. The device is made out of mechanical and electrical part where mechanical part is made out of two levitating magnets that repent each other and an electrical part is made out of magnetic circuit and a coil whose relative motion induces voltage in the coil. Mathematical model is made in Matlab, Simulink and FEMM. Construction model is made in Inventor.
|
|
| |
|
| |
|
|
MEMS based energy harvesting
Klempa, Jaroslav ; Prášek, Jan (referee) ; Gablech, Imrich (advisor)
This work is dedicated to principles of energy harvesting or scavenging from free energy around us. Energy harvesting principles are described in the first part. Following chapter is devoted to description of piezoelectricity and piezoelectric materials. Next part researches already reported results on piezoelectric energy harvesters. Following chapter shows simulations on designed structures in ANSYS® Workbench. Next the fabrication of the structures is described. Measurement are made regarding to maximum generated power.
|
|
| |
|
|
Walking as alternative source of electrical energy
Smilek, Jan ; Hejč, Tomáš (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with problematics of using the Energy Harvesting principles for generating power from the human walking. Own acceleration measurement during walking was made on various locations of human body to provide data for self-developed MATLAB/Simulink energy balance script. The script clearly sets the possibilities and limits of vibration generator used in this application. Conclusions of the energy balance were used to specify requirements for development of vibration generator and few possible conceptions, working on frequencies close to 2 Hz and acceleration amplitudes 0,3 g, were presented, or simulated.
|
|
|
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.
|
|
|
Pyroelectric conversion and pyroelectric generators
Kaše, Jakub ; Pospíšil, Jiří (referee) ; Brázdil, Marian (advisor)
Presented bachelor thesis deals with pyroelectric conversion and pyroelectric generator applications. The principle of pyroelectric phenomenon and its origin in materials are described and known materials exhibiting significant pyroelectric properties are compared. Furthermore, pyroelectric generator constructions are presented and compared, an overview of implemented pyroelectric devices is created and possible future applications of pyroelectric generators are described. Following this, a comparison of pyroelectric conversion to alternative conversion methods is made and pyroelectric generators’ potential is evaluated with special focus on waste heat utilization. Current pyroelectric devices are able to reach thermal to electric conversion efficiency of 1,3 % or power density of 120 W/m2 while powered by a heat source with maximum temperature of 250 °C or lower. With regard to these results, this technology is potentially useable and further development and applications can be predicted in the future.
|
|
|
The system of load matching to the energy converter
Halama, Petr ; Mandlík, Michal (referee) ; Drexler, Petr (advisor)
This master’s thesis deals with energy harvesting from the mechanical energy sources. The mechanical energy may be converted into the electrical by means of a vibrational microgenerator. The thesis deals also with the production of energy from different renewable sources. There have been identified conditions for effective transformation of the remaining energy. In order to satisfy these conditions a circuit for load matching to energy harvester has to be used. Four variants of matching circuit have been designed and analyzed in PSpice or LTspice. It has been designed a system of power factor correction controlled by circuit with discrete components and also by microcontroller. For one of these variants a specific integrated circuit has been used. The designed circuits have been built and their parameters haven been determined by measurement.
|
|
|
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.
|
guest ::
