331 research outputs found
USV charging based on WPT system
With the increasing demand of water and underwater exploration, more and more
electric unmanned surface vehicles (USV) are put into use in recent years. However,
because of the present battery technology limits, these devices require to be recharged
frequently that is a challenging problem taking into account the complex water
environment where these equipments are acting. To improve safety and convenience of
USV charging a wireless power transfer (WPT) system is proposed in this dissertation.
In this case, the boat can be controlled to go to the charging facilities. During charging
by the implemented WPT system, the state of charging can be remotely monitored by
host computer.
The moving control is based on embedded system. The relative position between
transmitting coil and receiving coil is supposed to be sensed by magnetic sensor, since
the relative position has great impact on transmission efficiency.
The remote monitoring software was implemented in the host computer and was
developed in LABVIEW. A graphical user interface was developed to control the boat
moving and collect the data from the WPT and the boat sensors. The effectiveness of the
proposed system was tested for instance in the laboratory environment and in-field tests
are also planned in the near future.Com a crescente procura da exploração em ambientes aquáticos e subaquáticos , os
veículos elétricos de superfície não tripulados ("electric unmanned surface vehicle" -USV)
têm sido cada vez mais utilizados nestes últimos anos. No entanto, devido aos limites
atuais relacionados com a tecnologia utilizada nas baterias, os dispositivos precisam de
ser recarregados com frequência para poderem operar num ambiente aquático complexo.
Para melhorar a segurança e a conveniência do carregamento da bateria de um USV, um
sistema para recarregamento da bateria de um barco não tripulado através de transferência
de energia sem fios("wireless power transfer" - WPT) é proposto nesta dissertação. Neste
caso de estudo, o barco tem a capacidade de ser controlado para chegar a um ponto de
recarregamento da bateria, que se encontra fixado por uma doca mecânica. Enquanto o
sistema WPT érecarregado, os dados associados ao processo de recarregamento da
bateria podem ser monitorizados por um computador host.
O controlo da movimentação do barco é baseado num sistema embebido. A posição
relativa entre a bobina transmissora e a bobina receptora deve ser detectada pelo sensor
magnético, uma vez que a posição relativa tem um grande impacto na eficiência da
transmissão.
Em termos do computador host, foi utilizado o software LABVIEW para programar a
interface que permite controlar o movimento do barco e recolher os dados. Finalmente,
a eficácia do sistema proposto foi experimentada e testada num ambiente de laboratório
Mobihealth: mobile health services based on body area networks
In this chapter we describe the concept of MobiHealth and the approach developed during the MobiHealth project (MobiHealth, 2002). The concept was to bring together the technologies of Body Area Networks (BANs), wireless broadband communications and wearable medical devices to provide mobile healthcare services for patients and health professionals. These technologies enable remote patient care services such as management of chronic conditions and detection of health emergencies. Because the patient is free to move anywhere whilst wearing the MobiHealth BAN, patient mobility is maximised. The vision is that patients can enjoy enhanced freedom and quality of life through avoidance or reduction of hospital stays. For the health services it means that pressure on overstretched hospital services can be alleviated
State of the Art, Trends and Future of Bluetooth Low Energy, Near Field Communication and Visible Light Communication in the Development of Smart Cities
The current social impact of new technologies has produced major changes in all
areas of society, creating the concept of a smart city supported by an electronic infrastructure,
telecommunications and information technology. This paper presents a review of Bluetooth Low
Energy (BLE), Near Field Communication (NFC) and Visible Light Communication (VLC) and their
use and influence within different areas of the development of the smart city. The document also
presents a review of Big Data Solutions for the management of information and the extraction of
knowledge in an environment where things are connected by an “Internet of Things” (IoT) network.
Lastly, we present how these technologies can be combined together to benefit the development of
the smart city
Wireless Power Transfer Impact on Data Channel
Trabalho apresentado no 23rd International Symposium on Power Electronics, Electrical Drives, Automation and Motion (Speedam, 2016), 22-24 junho de 2016, Capri, ItáliaThis paper presents measurement results and analysis of the interference produced by the high-power electromagnetic field in a wireless energy transfer system. Through this analysis it is expected to be possible to evaluate the influence of the strong electromagnetic field on the data transmission channel. The wireless power transfer aimed at electric vehicles battery charging receives a great deal of attention in the recent years. However, the performance of those systems depends on the exchange of information between the transmitter and the receiver, e.g. vehicle identification, frequency, required power, payment information. Thus, it is essential to ensure that the electromagnetic interference, generated by the wireless power transfer system will not influence or disrupt the communication between the transmitter and the receiver.N/
Energy harvesting and wireless transfer in sensor network applications: Concepts and experiences
Advances in micro-electronics and miniaturized mechanical systems are redefining the scope and extent of the energy constraints found in battery-operated wireless sensor networks (WSNs). On one hand, ambient energy harvesting may prolong the systems lifetime or possibly enable perpetual operation. On the other hand, wireless energy transfer allows systems to decouple the energy sources from the sensing locations, enabling deployments previously unfeasible. As a result of applying these technologies to WSNs, the assumption of a finite energy budget is replaced with that of potentially infinite, yet intermittent, energy supply, profoundly impacting the design, implementation, and operation of WSNs. This article discusses these aspects by surveying paradigmatic examples of existing solutions in both fields and by reporting on real-world experiences found in the literature. The discussion is instrumental in providing a foundation for selecting the most appropriate energy harvesting or wireless transfer technology based on the application at hand. We conclude by outlining research directions originating from the fundamental change of perspective that energy harvesting and wireless transfer bring about
A Review of Leak Detection Systems for Natural Gas Pipelines and Facilities
Pipelines facilities, used for the transportation of natural gas in large quantities to homes and industries, remain the best economic, most reliable and safest mode of transport of energy. Despite these numerous advantages, gas pipelines have been enmeshed in various accidents and thefts, nonetheless this could be reduced if properly maintained and pipelines can last indefinitely without leaks. Pipelines are susceptible to leakages and rupture accidents as a result of age, corrosion, material defects, operational errors or other reasons. Pipeline failures may be caused intentionally (e.g. vandalism) or unintentionally (e.g. device/material failure and corrosion), which may result into irreversible damages such as financial losses, human casualties, ecological disaster and extreme environmental pollution. Leakages in natural gas facilities and installations require three vital aspects, namely: Gas Leakage Prevention, Gas Leakage Detection and Gas Leakage Mitigation. Many Gas Leak Detection methods are used for pipeline integrity management and especially for minimizing gas leakage. The performance of these methods depends on the approaches, operational conditions and pipeline networks. Also, there are some essential requirements and guidelines which must be met before we can consider any leak detection system suitable for production solutions, including sensitivity, reliability, accuracy and robustness. The attempt of this study is to carry out a critical review of these models, to ascertain the best model(s) applicable to natural gas leak detection. Keywords: Gas Leak Detection System, Leak Location, Leak Size DOI: 10.7176/JETP/13-2-02 Publication date: April 30th 202
Magnetic Flux Leakage techniques for detecting corrosion of pipes
Oil and gas pipelines are subjected to corrosion due to harsh
environmental conditions as in refinery and thermal power plants. Interesting problems such as internal and external corrosion, emerging from the increasing demand for pipeline protection have prompted this study. Thus, early detection of faults in pipes is essential to avoid disastrous outcomes.
The research work presented in this thesis comprises investigations into the use of magnetic flux leakage (MFL) testing for pipe in extreme (underwater and high temperature) conditions. The design of a coil sensor (ferrite core with coil) with a magnetic circuit is carried out for high temperature conditions. The sensor thus developed lays the ground for non-destructive evaluation (NDE) of flaws in pipes through the MFL
technique. The research focusses on the detection and characterization of MFL distribution caused by the loss of metal in ferromagnetic steel pipes.
Experimental verifications are initially conducted with deeply rusted pipe samples of varying thicknesses in air. AlNiCo magnets are used along with Giant Magneto Resistance (GMR) sensor (AA002-02). The experiment is further repeated for saltwater conditions in relation to varying electrical conductivity with radio frequency identification (RFID) technique.
A further study carried out in the research is the correlation between magnetic and underwater data communication. The study has resulted in the development and experimental evaluation of a coil sensor with its magnetic response at room and high temperatures. This makes the system effective under high temperature conditions where corrosion metal loss needs to be determined
Magnetic Flux Leakage techniques for detecting corrosion of pipes
Oil and gas pipelines are subjected to corrosion due to harsh
environmental conditions as in refinery and thermal power plants. Interesting problems such as internal and external corrosion, emerging from the increasing demand for pipeline protection have prompted this study. Thus, early detection of faults in pipes is essential to avoid disastrous outcomes.
The research work presented in this thesis comprises investigations into the use of magnetic flux leakage (MFL) testing for pipe in extreme (underwater and high temperature) conditions. The design of a coil sensor (ferrite core with coil) with a magnetic circuit is carried out for high temperature conditions. The sensor thus developed lays the ground for non-destructive evaluation (NDE) of flaws in pipes through the MFL technique. The research focusses on the detection and characterization of MFL distribution caused by the loss of metal in ferromagnetic steel pipes.
Experimental verifications are initially conducted with deeply rusted pipe samples of varying thicknesses in air. AlNiCo magnets are used along with Giant Magneto Resistance (GMR) sensor (AA002-02). The experiment is further repeated for saltwater conditions in relation to varying electrical conductivity with radio frequency identification (RFID) technique.
A further study carried out in the research is the correlation between magnetic and underwater data communication. The study has resulted in the development and experimental evaluation of a coil sensor with its magnetic response at room and high temperatures. This makes the system effective under high temperature conditions where corrosion metal loss needs to be determined
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