|
|
Practical Demonstrator for Maritime Navigation
Michálek, Aleš ; Pospíšil, Jan (referee) ; Mašek, Pavel (advisor)
This bachelor thesis deals with the issue of naval buoys and their types. The theoretical part is about the history, physical construction of buoys, different types of colors, and the rhythm of lights. In the second, practical part is described the process of creating a 3D model of a buoy, miniaturized HW for electrifying the buoy model, and programming the code for a given microcontroller. In the end, the possibility of further expansion options is outlined.
|
|
|
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.
|
|
|
Automatic Detection of a Vessel Mooring at an Anchor Buoy in LPWAN Networks
Kejík, Petr ; Klusáček, Stanislav (referee) ; Kopečný, Lukáš (advisor)
This Master’s thesis deals with the design and construction of a maintenance-free unit for the detection of vessel mooring to an anchor buoy. The unit is powered by a battery with the possibility of running from another alternative source of power, in this particular case a solar panel. For wireless communication, the unit uses LoRa and NB-IoT technologies working in the LPWAN networks. During the designing phase, emphasis is placed on aspects such as maintenance-free duty, minimal consumption and the possibility of mounting on any type of buoy. The thesis also deals with the mechanical design of the device and design of the prototype of the detection element. The work is created in a cooperation with Netlia IoT s.r.o., which mainly deals with the custom production of devices using smart sensors and LPWAN communication technologies.
|
|
|
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.
|
|
|
Practical Demonstrator for Maritime Navigation
Michálek, Aleš ; Pospíšil, Jan (referee) ; Mašek, Pavel (advisor)
This bachelor thesis deals with the issue of naval buoys and their types. The theoretical part is about the history, physical construction of buoys, different types of colors, and the rhythm of lights. In the second, practical part is described the process of creating a 3D model of a buoy, miniaturized HW for electrifying the buoy model, and programming the code for a given microcontroller. In the end, the possibility of further expansion options is outlined.
|
|
|
Function and strategies of a neonatal sibling competition during access to teats in domestic pigs
Věchetová, Markéta ; Illmannová, Gudrun (advisor) ; Hejcmanová, Pavla (referee)
Domestic pigs have a high piglet mortality up to 20% during the first days post partum. It is unclear whether piglet mortality is caused by neonatal litter competition. Piglets are precocial and capable of active competition within minutes of birth on access to teats. There is very little known about this theme. The aim of the study is to review the behavioural mechanism of neonatal sibling competition during teat access and their consequences in domestic pigs. Factors which influence the level of neonatal litter competition should be considered. The consequences of the neonatal sibling competition should be reviewed on the survival and life history of individual piglets. Based on the knowledge from the literature an experimental design should be suggested for further experiments which clarify unknown aspects of litter competition.
|
guest ::
