5 documents found, page 1 of 1
Numerical and experimental characterisation of polylactic acid (PLA) processed ...
Salgueiro, Mariana P.; Pereira, Fábio A. M.; Faria, C.L.; Pereira, E. N. B.; Almeida, João Alberto Pinheiro Pereira; Campos, Teresa D.; Fakher, ChaariIn additive manufacturing (AM), one of the most popular procedures is material extrusion (MEX). The materials and manufacturing parameters used in this process have a significant impact on a printed product’s quality. The purpose of this work is to investigate the effects of infill percentage and filament orientation on the mechanical properties of printed structures. For this reason, the characterisation of po...
Underwater energy harvesting to extend operation time of submersible sensors
Faria, C.L.; Martins, Marcos Silva; Matos, Tiago; Lima, Rui Alberto Madeira Macedo; Miranda, João M.; Gonçalves, L. M.A linear electromagnetic energy harvesting device for underwater applications, fabricated with a simple manufacturing process, was developed to operate with movement frequencies from 0.1 to 0.4 Hz. The generator has two coils, and the effect of the combination of the two coils was investigated. The experimental study has shown that the energy capture system was able to supply energy to several ocean sensors, pr...
Ocean energy harvesting device for long-term monitoring applications
Faria, C.L.; Matos, Tiago; Martins, Marcos Silva; Lima, Rui Alberto Madeira Macedo; Miranda, J. M.; Gonçalves, L. M.This work reports the development and test of an energy harvester (few centimetres sized) designed to power the miliwatts required in submersible monitoring systems, that uses water movements as energy source. The device was fabricated with moulded materials (epoxy resin and silicone), using additive manufacturing for mould fabrication. The device was characterized with movements from 0.1 Hz to 0.4 Hz, and the ...
Design of a multipoint cost-effective optical instrument for continuous in-situ...
Matos, Tiago; Faria, C.L.; Martins, Marcos Silva; Henriques, Renato; Gomes, P. A.; Gonçalves, L. M.A cost-effective optical instrument for continuous in-situ monitoring applications is presented. With a production cost in raw materials of 38 €, a power consumption of 300 A in sleep mode and 100 mA in active mode (5 ms reading), and a capacity to monitor turbidity and sedimentary displacement at eight different depths in the water column, the sensor was developed for sediment monitoring in coastal areas. Due ...
A four-probe salinity sensor optimized for long-term autonomous marine deployments
Baptista, J. P.; Matos, T.; Faria, C.L.; Magalhaes, Vitor H.; Vieira, E. M. F; Martins, Marcos Silva; Gonçalves, L. M.; Lopes, Sérgio F.; Brito, F. B.Salinity measurement in water is typically performed with conductivity sensors. However, for long-term marine deployments, loss of precision is observed, mainly due to electrode drift (oxidation and degradation occurs in the presence of water, salts and bio-fouling), which results in inaccuracy of measurements. A cost-effective, low-power, four-probe salinity sensor is presented, to accurately measure long-term...