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Design of Resonance Mechanism for Rolling Mass Energy Harvester
Kvaššay, Miroslav ; Věchet, Stanislav (referee) ; Hadaš, Zdeněk (advisor)
A significantly important part in sea monitoring is to find the right choice of electric generator to power sensors in ocean buoys. This Bachelor’s thesis introduces a design of resonance mechanism for rolling mass energy harvester running on very low excitation frequencies, which are present in a marine environment. Firstly, there is research about energy harvesters based on planar motion, from which a prototype of resonance mechanism has been designed, based on a proof of mass, rolling in an internal gear. Second, after a proper analysis of proposed mechanism, a final resonance mechanism design for a rolling mass energy harvester has been made, with a natural frequency of 0,84 Hz. This mechanism can be adjusted by changing the gear or steel tube parameters to fit different objectives. Third, a physical prototype realization of the proposed mechanism was generated and successfully tested on a robot arm. To generate an electricity the energy harvester utilizes electromagnetic induction, which was tested on two pairs of coils. The prototype produced on average 1,81 mW of power undergoing harmonic excitations with an amplitude of ±20° around the Z axis at resonance frequency in serial wired coils with 332 resistance. The conclusion of the experimental measurements suggests that a proposed energy harvester is suitable for self-powered ocean buoys and can generate more electricity when a coil is fully optimized.
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Multi-body system of structures with electro-mechanical resonators
Tichý, Jiří ; Lošák, Petr (referee) ; Hadaš, Zdeněk (advisor)
This thesis is dealing with creation of computation model of energy harvestors. Harvestors based on translational motion and planar motion were modeled. These models were created in MSC Adams. Proposed harvestors are tranforming mechanical vibrations into electrical energy by electromagnetical induction. To achieve better electrical output, harvestors were tuned to natural frequency suitable for chosen aplication. First proposed harvestor is meant for railway track. For validation of its usability in intended application, model of railway track section is also proposed. Force generated by passing train is used for excitation of the track model. Second harvestor is nonlinear electromechanical oscilator proposed for use on unanchored sea buoy (drifter). After retuning previously proposed concept of energy harvestor to natural frequency 1.6 Hz, computation model for simulation purposes was created. After the simulation of sinusoidal excitation, the excitation based on real sea data was simulated. When excited by regular sea, the peak electric power 9 W was achieved. When excited by irregular sea the peak electrical power of the generator was 7.5 mW.
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Simulation and modeling of free body dynamic inside sea drifter
Moravec, Jakub ; Věchet, Stanislav (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with the development of a simulation model of an energy harvester based on the electromagnetic resonator principle. The introduction focuses on a search of the devices created so far for the conversion of kinetic energy of the sea into electrical energy. Furthermore, a model of the resonator design tuned to a frequency of 1.6 Hz is created in the body dynamics program MSC Adams. Simulations are performed in this program to analyze the resonator properties. Finally, the model is tested by real sea excitation. From these simulations, the electrical power obtained by this device is then predicted. Under regular sea excitation, the harvester power reached instantaneous peak values of 5 W and in case of irregular sea excitation the peak power values reached up to 16 mW.
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Simulation and modeling of free body dynamic inside sea drifter
Moravec, Jakub ; Věchet, Stanislav (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with the development of a simulation model of an energy harvester based on the electromagnetic resonator principle. The introduction focuses on a search of the devices created so far for the conversion of kinetic energy of the sea into electrical energy. Furthermore, a model of the resonator design tuned to a frequency of 1.6 Hz is created in the body dynamics program MSC Adams. Simulations are performed in this program to analyze the resonator properties. Finally, the model is tested by real sea excitation. From these simulations, the electrical power obtained by this device is then predicted. Under regular sea excitation, the harvester power reached instantaneous peak values of 5 W and in case of irregular sea excitation the peak power values reached up to 16 mW.
|
|
|
Design of Resonance Mechanism for Rolling Mass Energy Harvester
Kvaššay, Miroslav ; Věchet, Stanislav (referee) ; Hadaš, Zdeněk (advisor)
A significantly important part in sea monitoring is to find the right choice of electric generator to power sensors in ocean buoys. This Bachelor’s thesis introduces a design of resonance mechanism for rolling mass energy harvester running on very low excitation frequencies, which are present in a marine environment. Firstly, there is research about energy harvesters based on planar motion, from which a prototype of resonance mechanism has been designed, based on a proof of mass, rolling in an internal gear. Second, after a proper analysis of proposed mechanism, a final resonance mechanism design for a rolling mass energy harvester has been made, with a natural frequency of 0,84 Hz. This mechanism can be adjusted by changing the gear or steel tube parameters to fit different objectives. Third, a physical prototype realization of the proposed mechanism was generated and successfully tested on a robot arm. To generate an electricity the energy harvester utilizes electromagnetic induction, which was tested on two pairs of coils. The prototype produced on average 1,81 mW of power undergoing harmonic excitations with an amplitude of ±20° around the Z axis at resonance frequency in serial wired coils with 332 resistance. The conclusion of the experimental measurements suggests that a proposed energy harvester is suitable for self-powered ocean buoys and can generate more electricity when a coil is fully optimized.
|
|
|
Multi-body system of structures with electro-mechanical resonators
Tichý, Jiří ; Lošák, Petr (referee) ; Hadaš, Zdeněk (advisor)
This thesis is dealing with creation of computation model of energy harvestors. Harvestors based on translational motion and planar motion were modeled. These models were created in MSC Adams. Proposed harvestors are tranforming mechanical vibrations into electrical energy by electromagnetical induction. To achieve better electrical output, harvestors were tuned to natural frequency suitable for chosen aplication. First proposed harvestor is meant for railway track. For validation of its usability in intended application, model of railway track section is also proposed. Force generated by passing train is used for excitation of the track model. Second harvestor is nonlinear electromechanical oscilator proposed for use on unanchored sea buoy (drifter). After retuning previously proposed concept of energy harvestor to natural frequency 1.6 Hz, computation model for simulation purposes was created. After the simulation of sinusoidal excitation, the excitation based on real sea data was simulated. When excited by regular sea, the peak electric power 9 W was achieved. When excited by irregular sea the peak electrical power of the generator was 7.5 mW.
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