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Start Over Search Limiters Available in Library Collection Topic energy harvesting Publication Type Electronic Resources
5 results

1. Sustainable Mobility and Transport.

Author

Inkinen, Tommi, Inkinen, Tommi, Wilson, Mark, and Yigitcanlar, Tan

Subjects
Film, TV & radio, BERT, Finland, Gauteng province, Mallorca mobility, Russia, academic research, battery electric vehicle, bidirectional electric vehicle charging, business models, charging infrastructure, club convergence, deep learning, electric vehicle, electric vehicle incentives, electric vehicle policy, emission, energy harvesting, environmental impact, green transport strategy, high-speed railway, hybrid electric vehicle, income gap, journalism, life cycle analysis, logistic regression, logistics, magazine, mobile energy, mobile-energy-as-a-service (MEaaS), mobility, modal choice, natural language processing (NLP), newspaper, nonlinear time-varying factor model, passenger car, piezoelectric, regulation, regulations, renewable energy resource, research review, shared mobility, simulation, smart cities, smart city, supply chains, sustainability, sustainable mobility, topic modelling, transport, transport planning, transportation, trucks, two-wheelers, urban electromobility
Abstract

Summary: This Special Issue is dedicated to sustainable mobility and transport, with a special focus on technological advancements. Global transport systems are significant sources of air, land, and water emissions. A key motivator for this Special Issue was the diversity and complexity of mitigating transport emissions and industry adaptions towards increasingly stricter regulation. Originally, the Special Issue called for papers devoted to all forms of mobility and transports. The papers published in this Special Issue cover a wide range of topics, aiming to increase understanding of the impacts and effects of mobility and transport in working towards sustainability, where most studies place technological innovations at the heart of the matter. The goal of the Special Issue is to present research that focuses, on the one hand, on the challenges and obstacles on a system-level decision making of clean mobility, and on the other, on indirect effects caused by these changes.

2. Zero-Power AC Current Sensor

Subjects
Energy Harvesting
Abstract

In this study, a magnetic piezoelectric cantilever powered AC current and frequency sensor is proposed. This paper covers the configuration of the experimental setup, finite element modeling of the magnetic coupling, and the optimal spatial location of the magnetic proof mass in relation to the wire for smart grid applications. Solid and stranded copper wires of various gauges were used and carried current up to 30A. The magnets act as a proof mass to lower the frequency while also coupling to the magnetic field generated by the current carrying wire. The frequency of the AC current produces a sinusoidal force on the piezoelectric cantilever. Vibrational energy is then converted to electrical energy which can be used to power a wireless sensor node. Two different cantilevers with varying stiffness are considered as possible power/sensing elements in the proposed sensor. They are tuned to resonate at 60 Hz using neodymium (NdFeB) magnets.

Published
2022

3. Zero-Power AC Current Sensor

Subjects
Energy Harvesting
Abstract

In this study, a magnetic piezoelectric cantilever powered AC current and frequency sensor is proposed. This paper covers the configuration of the experimental setup, finite element modeling of the magnetic coupling, and the optimal spatial location of the magnetic proof mass in relation to the wire for smart grid applications. Solid and stranded copper wires of various gauges were used and carried current up to 30A. The magnets act as a proof mass to lower the frequency while also coupling to the magnetic field generated by the current carrying wire. The frequency of the AC current produces a sinusoidal force on the piezoelectric cantilever. Vibrational energy is then converted to electrical energy which can be used to power a wireless sensor node. Two different cantilevers with varying stiffness are considered as possible power/sensing elements in the proposed sensor. They are tuned to resonate at 60 Hz using neodymium (NdFeB) magnets.

Published
2022

4. Energy-Efficient Computing and Communication.

Author

Pack, Sangheon and Pack, Sangheon

Subjects
History of engineering & technology, 1-bit unit cell, Internet of Things (IoT), UAV, UAV network, adaptive beam focusing, buffer, clustering, coding metasurface, computation offloading, constraint Markov decision process (CMDP), cooperative communications, energy, energy efficiency, energy harvesting, energy-neutral operation, lyapunov optimization, mobile edge computing, offloading, optimization, power control, relay, simultaneous wireless information and power transfer, space division, topology control, wireless power transfer, wireless powered sensor network
Abstract

Summary: Information and communication technology (ICT) is reponsible for up to 10% of world power consumption. In particular, communications and computing systems are indispensable elements in ICT; thus, determining how to improve the energy efficiency in communications and computing systems has become one of the most important issues for realizing green ICT. Even though a number of studies have been conducted, most of them focused on one aspect-either communications or computing systems. However, salient features in communications and computing systems should be jointly considered, and novel holistic approaches across communications and computing systems are strongly required to implement energy-efficient systems. In addition, emerging systems, such as energy-harvesting IoT devices, cyber-physical systems (CPSs), autonomous vehicles (AVs), and unmanned aerial vehicles (UAVs), require new approaches to satisfy their strict energy consumption requirements in mission-critical situations. The goal of this Special Issue is to disseminate the recent advances in energy-efficient communications and computing systems. Review and survey papers on these topics are welcome. Potential topics include, but are not limited to, the following: • energy-efficient communications: from physical layer to application layer; • energy-efficient computing systems; • energy-efficient network architecture: through SDN/NFV/network slicing; • energy-efficient system design; • energy-efficient Internet of Things (IoT) and Industrial IoT (IIoT); • energy-efficient edge/fog/cloud computing; • new approaches for energy-efficient computing and communications (e.g., AI/ML and data-driven approaches); • new performance metrics on energy efficiency in emerging systems; • energy harvesting and simultaneous wireless information and power transfer (SWIPT); • smart grid and vehicle-to-grid (V2G); and • standardization and open source activities for energy efficient systems.

5. Micropower generation using buckling piezoelectric elements

Author

Counsell, Nathan Alan

Subjects
Energy Harvesting, Piezoelectric, Renewable Energy, Buckling Piezoelectrics, Monostable, Piezoelectric Ceramics, Optimised Buckling Structures
Abstract

In recent years, piezoelectric materials and structures have gained significant attention for energy harvesting purposes. This attention can be attributed to the enhancement of low-power electronics and the high energy density of piezoelectric materials compared to other forms of energy conversion and transduction. This work explores the recent contributions to the field of piezoelectric energy harvesting, contributing two novel methods that can be implemented to improve the power output and efficiency of a single piezoelectric element. The methods that have been investigated in this thesis are based on the buckling of piezoelectric material. The initial method examines a diaphragm preformed piezoelectric element, where numerical and simulation model has been carried out. This work has then been validated through experimentation, where empirical data has been collected verifying the COMSOL model and future optimising the manufacturing process of the diaphragm. This work contributes to a peer-reviewed paper "Powering lights with Piezoelectric energy-harvesting floors" published in the journal Energy Technology. This work shows that employed a diaphragm structure can increase both efficiency and power output with an increase of efficiency from 0.522% to 3.765%. The observed power output increase from 191.686µJ to 644.16µJ. The second method investigates a preloaded piezoelectric curved structure with elastic walls. The use of nonlinear materials is critical to the development of a buckling structure, allowing energy to be stored upon actuation while reducing input stresses. The result of this is a reduced buckling force, with an increased energy output and efficiency for the whole system. The findings of this work demonstrate that efficiency can be increase from 0.522% to 16.813% while achieving a greater power output from 191.686µJ to 208.577µJ. Furthermore, this work identifies that a monostable structure as opposed to a bi or multi-stable structure can significantly produce higher power outputs than conventional methods, whilst achieving long life within a small compact area. A COMSOL simulation of the mechanical behaviour coupled with the constitutive equations has been developed to enable future optimises to structure and design and validated using the empirical data. In additional, two equations have been developed using empirical data to aid in selection of buckling force and power output for an energy harvester. This is to enable developers of low-power electronics to select the optimised system for their application reducing the need for primary batteries within electrical devices.

Published
2021
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