ISEP - DM – Outros
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Browsing ISEP - DM – Outros by advisor "Almeida, José Miguel Soares de"
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- Energy Harvesting for Autonomous Underwater VehiclesPublication . Regemortel, Joram Van; Almeida, José Miguel Soares de; Neves, Betina Baere de Faria CamposIn this study, energy production for autonomous underwater vehicles is investigated. This project is part of a bigger project called TURTLE. The autonomous vehicles perform oceanic researches at seabed for which they are intended to be kept operational underwater for several months. In order to ful l a long-term underwater condition, powerful batteries are combined with \micro- scale" energy production on the spot. This work tends to develop a system that generates power up to a maximum of 30 W. Latter energy harvesting structure consists basically of a turbine combined with a generator and low-power electronics to adjust the achieved voltage to a required battery charger voltage. Every component is examined separately hence an optimum can be de ned for all, and subsequently also an overall optimum. Di erent design parameters as e.g. number of blades, solidity ratio and cross-section area are compared for di erent turbines, in order to see what is the most feasible type. Further, a generator is chosen by studying how ux distributions might be adjusted to low velocities, and how cogging torque can be excluded by adapted designs. Low-power electronics are con gured in order to convert and stabilize heavily varying three-phase voltages to a constant, recti ed voltage which is usable for battery storage. Clearly, di erent component parameters as maximum power and torque are matched here to increase the overall power generation. Furthermore an overall maximum power is set up for achieving a maximum power ow at load side. Due to among others typical low velocities of about 0.1 to 0.5 m/s, and constructing limits of the prototype, the vast range of components is restricted to only a few that could be used. Hence, a helical turbine is combined in a direct drive mode to a coreless-stator axial- ux permanent-magnet generator, from which the output voltage is adjusted subsequently by a recti er, impedance matching unit, upconverter circuit and an overall control unit to regulate di erent component parameters. All these electronics are combined in a closed-loop design to involve positive feedback signals. Furthermore a theoretical con guration for the TURTLE vehicle is described in this work and a solution is proposed that might be implemented, for which several design tests are performable in a future study.
- Mapeamento 3D com sistemas LiDAR e GNSSPublication . Cerekwicki, Maciej; Almeida, José Miguel Soares deThe project begun by collecting all the information connected with geodesy, map projections and Global Navigation Systems. In the same time theoretical part covers also manuals and specification of further used tools like FARO Laser an GNSS Receiver. After get to know about theoretical part the next step was to work with outdoor devices. Before do all surveys it has to be known all rules connected with health and safety. Then it has to be done leveling of the FARO Lasers holder. Afterwards on the top it was put GNSS Receiver. It was working for a few minutes to collect as much information as necessary to know the position. Next step was to start the scanning of laser and do the photos. The same was done with the second position on the campus. When the outdoor work was done all parts had been taken to a magazine for further users. After the outdoor work the time comes to desk work. Before this task it has to be known computer programs that will be used in the project. To do a post-processing it was chosen the RTKLIB program. For the map projecting the best option was CloudCompare. With help from manuals and tutorials the work on a map can go ahead. At least after all tasks the final map was ready for the further use.