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Articles 1 - 15 of 15
Full-Text Articles in Engineering
Triboelectric Energy Harvester With Large Bandwidth Under Harmonic And Random Excitations, Alwathiqbellah Ibrahim, Abdallah Ramini, Shahrzad Towfighian
Triboelectric Energy Harvester With Large Bandwidth Under Harmonic And Random Excitations, Alwathiqbellah Ibrahim, Abdallah Ramini, Shahrzad Towfighian
Mechanical Engineering Faculty Publications and Presentations
This paper investigates an approach to impact vibration energy harvesting using a triboelectric mechanism under harmonic and random excitation. The harvester consists of a clamped–clamped beam with a stiff plate in the middle to realize the impact electrification process when subjected to external vibrations. The harvester uses stiffening in the clamped–clamped beam introduced by the impact between two triboelectric layers to increase the frequency bandwidth. A piecewise theoretical model is used to model the harvester for two scenarios of motions, before and after impact. The harvester is tested experimentally under different harmonic excitation to validate the theoretical model. The outcomes …
Data And Analysis Toolbox For Modeling The Nexus Of Food, Energy, And Water, Mojtaba Sadegh, Arvin Farid
Data And Analysis Toolbox For Modeling The Nexus Of Food, Energy, And Water, Mojtaba Sadegh, Arvin Farid
Civil Engineering Faculty Publications and Presentations
Energy, water, and food resources are highly interdependent. Agricultural irrigation accounts for 84% of global consumptive freshwater use, the food supply chain demands up to 30% of global primary energy use, and roughly 80% of global electricity generation depends on water for cooling (an average of nearly 100 L of water withdrawn per kWh). Improving understanding of the complex interactions of this resource nexus is, therefore, a top priority for human well-being, sustainable development, and policymaking. Here, we present an interactive analysis toolbox, Nexus of Food, Energy, and Water (NeFEW), that synthesizes available global data to …
Cost Analysis Of Optimized Islanded Energy Systems In A Dispersed Air Base Conflict, Jay F. Pearson, Torrey J. Wagner, Justin D. Delorit
Cost Analysis Of Optimized Islanded Energy Systems In A Dispersed Air Base Conflict, Jay F. Pearson, Torrey J. Wagner, Justin D. Delorit
Faculty Publications
The United States Air Force has implemented a dispersed air base strategy to enhance mission effectiveness for near-peer conflicts. Asset dispersal places many smaller bases across a wide geographic area, which increases resupply requirements and logistical complexity. Hybrid energy systems reduce resupply requirements through sustainable, off-grid energy production. This paper presents a novel hybrid energy renewable delivery system (HERDS) model capable of (1) selecting the optimal hybrid energy system design that meets demand at the lowest net present cost and (2) optimizing the delivery of the selected system using existing Air Force cargo aircraft. The novelty of the model’s capabilities …
An Assessment Of Renewable Energy Technology Implementation In Storrs, Connecticut: Emissions Reduction And Feasibility Of A Microgrid System At Uconn, Sophie Macdonald
An Assessment Of Renewable Energy Technology Implementation In Storrs, Connecticut: Emissions Reduction And Feasibility Of A Microgrid System At Uconn, Sophie Macdonald
Honors Scholar Theses
The purpose of this project is to design a clean energy-sourced microgrid for UConn’s main campus that would reduce the university’s energy emissions while remaining within the geographic boundaries of viable UConn-owned land. Economic cost was not considered in this analysis; instead, emissions and space constraints were the optimized measures of value and feasibility. Sources of energy that were considered include photovoltaics (PV), wind turbines, hydrokinetic systems, and fuel cells. Energy storage capacity was included in the analysis as well. The overall system was optimized first by ignoring space constraints and for a minimum of 10% reduction from the current …
Energy Conservation With Open Source Ad Blockers, Joshua M. Pearce
Energy Conservation With Open Source Ad Blockers, Joshua M. Pearce
Michigan Tech Publications
Internet-related electricity consumption is rising rapidly as global Internet users spend more than 6.5 h per day online. Open source ad blockers have the potential to reduce the time and thus electricity spent using computers by eliminating ads during Internet browsing and video streaming. In this study, three open source ad blockers are tested against a no-ad blocker control. Page load time is recorded for browsing a representative selection of the globally most-accessed websites, and the time spent watching ads on videos is quantified for both trending and non-trending content. The results show that page load time dropped 11% with …
Ultrahigh Energy Storage Properties In (Sr0.7bi0.2)Tio3-Bi(Mg0.5zr0.5)O3 Lead-Free Ceramics And Potential For High-Temperature Capacitors, Xi Kong, Letao Yang, Zhenxiang Cheng, Shujun Zhang
Ultrahigh Energy Storage Properties In (Sr0.7bi0.2)Tio3-Bi(Mg0.5zr0.5)O3 Lead-Free Ceramics And Potential For High-Temperature Capacitors, Xi Kong, Letao Yang, Zhenxiang Cheng, Shujun Zhang
Australian Institute for Innovative Materials - Papers
2020 by the authors. Due to the enhanced demand for numerous electrical energy storage applications, including applications at elevated temperatures, dielectric capacitors with optimized energy storage properties have attracted extensive attention. In this study, a series of lead-free strontium bismuth titanate based relaxor ferroelectric ceramics have been successfully synthesized by high temperature solid-state reaction. The ultrahigh recoverable energy storage density of 4.2 J/cm3 under 380 kV/cm, with the high efficiency of 88%, was obtained in the sample with x = 0.06. Of particular importance is that this ceramic composition exhibits excellent energy storage performance over a wide work temperature up …
Outage Probability And Throughput Analyses In Full-Duplex Relaying Systems With Energy Transfer, Jiaman Li, Le Chung Tran, Farzad Safaei
Outage Probability And Throughput Analyses In Full-Duplex Relaying Systems With Energy Transfer, Jiaman Li, Le Chung Tran, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part B
In this article, we consider a dual-hop full-duplex (FD), amplify-and-forward, orthogonal frequency division multiplexing (OFDM) relaying network, where the relay operates based on a time-switching architecture to harvest energy from radio frequency signals. We use a polarization-enabled digital self-interference cancellation (PDC) scheme to cancel the self-interference signal at the relay in order to achieve FD communications. The paper provides a comprehensive analysis of the system performances in terms of outage probability and throughput over multipath Rayleigh fading channels. Furthermore, the optimal time split between the duration of energy harvesting and signal transmission to maximize the system throughput is numerically calculated. …
Progress In Piezoelectric Material Based Oceanic Wave Energy Conversion Technology, Mahbubur Kiran, Omar Farrok, Md Abdullah-Al-Mamun, Md Rabiul Islam, Wei Xu
Progress In Piezoelectric Material Based Oceanic Wave Energy Conversion Technology, Mahbubur Kiran, Omar Farrok, Md Abdullah-Al-Mamun, Md Rabiul Islam, Wei Xu
Faculty of Engineering and Information Sciences - Papers: Part B
Recently, electrical engineers are paying great attention to develop oceanic wave energy conversion technologies based on the piezoelectric materials because of their excellent conveniences. Piezoelectric oceanic wave energy converters (OWECs) have several benefits over the others such as its small size, lightweight, no requirement of using intermediate device as well as having less negative impacts on the oceanic environment. Various review and research papers focus on the piezoelectric devices, their operation and application for oceanic energy conversion. But, to the best of the authors’ knowledge, none of the existing research or review papers present detailed scheme of piezoelectric device based …
An Adaptive Feed-Forward Phase Locked Loop For Grid Synchronization Of Renewable Energy Systems Under Wide Frequency Deviations, Aravind Chellachi Kathiresan, Jeyaraj Pandiarajan, Asokan Sivaprakash, Thanikanti Sudhakar Babu, Md Rabiul Islam
An Adaptive Feed-Forward Phase Locked Loop For Grid Synchronization Of Renewable Energy Systems Under Wide Frequency Deviations, Aravind Chellachi Kathiresan, Jeyaraj Pandiarajan, Asokan Sivaprakash, Thanikanti Sudhakar Babu, Md Rabiul Islam
Faculty of Engineering and Information Sciences - Papers: Part B
Synchronization is a crucial problem in the grid-connected inverter’s control and operation. A phase-locked loop (PLL) is a typical grid synchronization strategy, which ought to have a high resistance to power system uncertainties since its sensitivity influences the generated reference signal. The traditional PLL catches the phase and frequency of the input signal via the feedback loop filter (LF). In general, to enhance the steady-state capability during distorted grid conditions generally, a filter tuned for nominal frequency is used. This PLL corrects large frequency deviations around the nominal frequency, which increases the PLL’s locking time. Therefore, this paper presents an …
Increase In Volumetric Electrical Power Density Of A Linear Generator By Winding Optimization For Wave Energy Extraction, Selim Molla, Omar Farrok, Abidur Rahman, Md Samiul Bashir, Md Rabiul Islam, Abbas Z. Zouzani, M. A Parvez Mahmud
Increase In Volumetric Electrical Power Density Of A Linear Generator By Winding Optimization For Wave Energy Extraction, Selim Molla, Omar Farrok, Abidur Rahman, Md Samiul Bashir, Md Rabiul Islam, Abbas Z. Zouzani, M. A Parvez Mahmud
Faculty of Engineering and Information Sciences - Papers: Part B
In this article, a method of winding optimization of the linear generator is proposed to increase the electrical power generation from the oceanic wave. A linear generator is designed in the ANSYS/Maxwell environment to analyze the proposed winding optimization method. The electrical and magnetic properties of the generator are extensively analyzed. The cross-sectional area and the number of turns of the copper conductor are optimized to maximize the output power. Load characteristics are also considered for different conductor sizes and turn numbers to determine a suitable operating point. A cooling system is also incorporated in the optimized linear generator to …
Homes With Higher Energy Ratings Sell For More. Here’S How Australian Owners Could Cash In, Daniel J. Daly
Homes With Higher Energy Ratings Sell For More. Here’S How Australian Owners Could Cash In, Daniel J. Daly
Faculty of Engineering and Information Sciences - Papers: Part B
Everybody wants an energy-efficient home. After all, an energy-efficient home is comfortable to live in, without large energy bills. These can be important factors for prospective home owners or renters. Our review of international research found energy-efficient homes typically fetch a higher price.
Green And Secure Computation Offloading For Cache-Enabled Iot Networks, M. Ishtiaque A. Zahed, Iftekhar Ahmad, Daryoush Habibi, Quoc Viet Phung
Green And Secure Computation Offloading For Cache-Enabled Iot Networks, M. Ishtiaque A. Zahed, Iftekhar Ahmad, Daryoush Habibi, Quoc Viet Phung
Research outputs 2014 to 2021
The ever-increasing number of diverse and computation-intensive Internet of things (IoT) applications is bringing phenomenal growth in global Internet traffic. Mobile devices with limited resource capacity (i.e., computation and storage resources) and battery lifetime are experiencing technical challenges to satisfy the task requirements. Mobile edge computing (MEC) integrated with IoT applications offloads computation-intensive tasks to the MEC servers at the network edge. This technique shows remarkable potential in reducing energy consumption and delay. Furthermore, caching popular task input data at the edge servers reduces duplicate content transmission, which eventually saves associated energy and time. However, the offloaded tasks are exposed …
Recent Progress In Electrical Generators For Oceanic Wave Energy Conversion, Abidur Rahman, Omar Farrok, Md Rabiul Islam, Wei Xu
Recent Progress In Electrical Generators For Oceanic Wave Energy Conversion, Abidur Rahman, Omar Farrok, Md Rabiul Islam, Wei Xu
Faculty of Engineering and Information Sciences - Papers: Part B
Oceanic wave energy extraction through electrical generator is one of the most interesting topics in the field of power engineering. Almost all the existing relevant review paper focus on electrical generator with the working principle of electromagnetic induction or piezoelectric or triboelectric effect. In this paper, all the existing types (based on principle of operation) of electrical generator used for wave power harvesting are discussed. This paper not only covers recent progress in electrical power generation by electro-magnetic induction, piezoelectric generator, and electrostatic induction, but also presents critical comparative review as well where suitable use and weakness of each type …
An Iot- Based Decision Support Tool For Improving The Performance Of Smart Grids Connected With Distributed Energy Sources And Electric Vehicles, Md Rabiul Islam, Haiyan Lu, M J. Hossain, Li Li
An Iot- Based Decision Support Tool For Improving The Performance Of Smart Grids Connected With Distributed Energy Sources And Electric Vehicles, Md Rabiul Islam, Haiyan Lu, M J. Hossain, Li Li
Faculty of Engineering and Information Sciences - Papers: Part B
vThe growing penetration of distributed energy sources (DES), such as photovoltaic (PV) solar power, battery energy systems and electric vehicles (EVs) into low voltage distribution networks is creating serious challenges for distribution network operators. Uncertain nature of these DES and EV charging is a key factor to cause unbalance, which degrade network performance in terms of energy loss, voltage unbalance, and voltage profile of the distribution network, etc. Some methods were proposed to mitigate such negative impact of these uncertain DES and EV charging from both centralized and decentralized approaches by controlling charging or discharging power of EVs. However, these …
Design And Optimization Of A Novel Dual-Port Linear Generator For Oceanic Wave Energy Conversion, Omar Farrok, Md Rabiul Islam, Kashem M. Muttaqi, Danny Sutanto, Jianguo Zhu
Design And Optimization Of A Novel Dual-Port Linear Generator For Oceanic Wave Energy Conversion, Omar Farrok, Md Rabiul Islam, Kashem M. Muttaqi, Danny Sutanto, Jianguo Zhu
Faculty of Engineering and Information Sciences - Papers: Part B
All the existing linear generators used for oceanic wave energy conversions are basically a single-port linear electrical generators (SPLEGs). The conventional SPLEG transfers electrical power to the load/grid discontinuously due to its working principle and the intermittent nature of oceanic waves. This paper proposes a new dual-port linear electrical generator (DPLEG) topology, which is capable to transfer electrical power with an adequate voltage even at zero vertical velocity of the oceanic wave. The analysis shows that the efficiency and the performance of the DPLEG depend greatly on the stator tooth design. For this reason, the proposed DPLEG is optimized using …