3,550 research outputs found
Design of Ad Hoc Wireless Mesh Networks Formed by Unmanned Aerial Vehicles with Advanced Mechanical Automation
Ad hoc wireless mesh networks formed by unmanned aerial vehicles (UAVs)
equipped with wireless transceivers (access points (APs)) are increasingly
being touted as being able to provide a flexible "on-the-fly" communications
infrastructure that can collect and transmit sensor data from sensors in
remote, wilderness, or disaster-hit areas. Recent advances in the mechanical
automation of UAVs have resulted in separable APs and replaceable batteries
that can be carried by UAVs and placed at arbitrary locations in the field.
These advanced mechanized UAV mesh networks pose interesting questions in terms
of the design of the network architecture and the optimal UAV scheduling
algorithms. This paper studies a range of network architectures that depend on
the mechanized automation (AP separation and battery replacement) capabilities
of UAVs and proposes heuristic UAV scheduling algorithms for each network
architecture, which are benchmarked against optimal designs.Comment: 12 page
Wireless sensors and IoT platform for intelligent HVAC control
Energy consumption of buildings (residential and non-residential) represents approximately 40% of total world electricity consumption, with half of this energy consumed by HVAC systems. Model-Based Predictive Control (MBPC) is perhaps the technique most often proposed for HVAC control, since it offers an enormous potential for energy savings. Despite the large number of papers on this topic during the last few years, there are only a few reported applications of the use of MBPC for existing buildings, under normal occupancy conditions and, to the best of our knowledge, no commercial solution yet. A marketable solution has been recently presented by the authors, coined the IMBPC HVAC system. This paper describes the design, prototyping and validation of two components of this integrated system, the Self-Powered Wireless Sensors and the IOT platform developed. Results for the use of IMBPC in a real building under normal occupation demonstrate savings in the electricity bill while maintaining thermal comfort during the whole occupation schedule.QREN SIDT [38798]; Portuguese Foundation for Science & Technology, through IDMEC, under LAETA [ID/EMS/50022/2013
Flexible Integration of Alternative Energy Sources for Autonomous Sensing
Recent developments in energy harvesting and autonomous sensing mean that it is now possible to power sensors solely from energy harvested from the environment. Clearly this is dependent on sufficient environmental energy being present. The range of feasible environments for operation can be extended by combining multiple energy sources on a sensor node. The effective monitoring of their energy resources is also important to deliver sustained and effective operation. This paper outlines the issues concerned with combining and managing multiple energy sources on sensor nodes. This problem is approached from both a hardware and embedded software viewpoint. A complete system is described in which energy is harvested from both light and vibration, stored in a common energy store, and interrogated and managed by the node
Wireless Charging of Mobile Systems
This project designs and implements a wireless charging system for small industrial mobile applications. A quick, efficient charging system allows for maximum resource utilization and minimized down time. Resonant inductive power transfer is demonstrated for this purpose. The efficiency of such a system is analyzed, and the results are promising, however there are significant opportunities for improvement
A Wireless Power Transfer Based Implantable ECG Monitoring Device
Implantable medical devices (IMDs) enable patients to monitor their health anytime and receive treatment anywhere. However, due to the limited capacity of a battery, their functionalities are restricted, and the devices may not achieve their intended potential fully. The most promising way to solve this limited capacity problem is wireless power transfer (WPT) technology. In this study, a WPT based implantable electrocardiogram (ECG) monitoring device that continuously records ECG data has been proposed, and its effectiveness is verified through an animal experiment using a rat model. Our proposed device is designed to be of size 24 x 27 x 8 mm, and it is small enough to be implanted in the rat. The device transmits data continuously using a low power Bluetooth Low Energy (BLE) communication technology. To charge the battery wirelessly, transmitting (Tx) and receiving (Rx) antennas were designed and fabricated. The animal experiment results clearly showed that our WPT system enables the device to monitor the ECG of a heart in various conditions continuously, while transmitting all ECG data in real-time.11Ysciescopu
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
Energy Storage Reservoir Management System For Wsn With Solar Harvesting
Most of the study in managing power on wireless sensor network node (WSN) is mainly on how to minimize current of the sensor node by using different types of algorithm applied to the radio transmission technique and on how to minimize power consumed by the sensing elements without affecting the accuracy of the data collected. Other research applied algorithm on radio transmission technique are by turning off the radio whenever possible to obtain energy savings. In other hand the sensoring element chosen must be very low energy consumed. The approach taken in this thesis is slightly different compared to other studies. The approach is to focus on the energy storage reservoir. Technically a parallel combination between two different types of energy storage chosen are the rechargeable lithium ion battery and supercapacitor. Supercapacitor are connected in series by using a simple cell balancer, a current regulator is created to give a balance charge and discharge current and charge voltage between the two series. Pulse load which is WSN radio will be supplied by supercapacitor since the capability of supercapacitor in handling pulse current faster due to the ability of faster charged and discharge characteristic giving a more balanced charge and discharge of the battery. The approach here is to create an on/off charging environment, giving the combination of energy storage device (ESD) time to being charged from solar panel through available charger without disturbance from the load. The on/off control from the timer is also used to control the power flow from the ESD, for power enhancement, and to deliver the power to the load efficiently. This improves the battery usage time and WSN nodes operation times. Experiments taken under four different approaches, the first one is control using the initial condition of the load without energy management and three designs with energy managements. The experimental results show that with the combination of on/off technique and the hybrid ( battery and supercapacitor) can achieve much longer runtime for the WSN node. The hybrid are built with one lithium ion battery and six 10F supercapacitor. The supercapacitor is connected two in series in three parallel combination giving total of 15F capacitance. An improvement of 160 % of the operating time for the WSN node is observed. The design presented in this research can be scaled to larger or smaller power capacities for a variety of other applications
Design and Implementation of a Wireless Charging-Based Cardiac Monitoring System Focused on Temperature Reduction and Robust Power Transfer Efficiency
Wireless power transfer systems are increasingly used as a means of charging implantable medical devices. However, the heat or thermal radiation from the wireless power transfer system can be harmful to biological tissue. In this research, we designed and implemented a wireless power transfer system-based implantable medical device with low thermal radiation, achieving 44.5% coil-to-coil efficiency. To suppress thermal radiation from the transmitting coil during charging, we minimized the ESR value of the transmitting coil. To increase power transfer efficiency, a ferrite film was applied on the receiving part. Based on analyses, we fabricated a cardiac monitoring system with dimensions of 17 x 24 x 8 mm(3) and implanted it in a rat. We confirmed that the temperature of the wireless charging device increased by only 2 degrees C during the 70 min charging, which makes it safe enough to use as an implantable medical device charging system.11Ysciescopu
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