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Articles 11941 - 11970 of 30096

Full-Text Articles in Mechanical Engineering

Semi-Annual Program Progress Performance Report For University Transportation Systems Pppr#9, Florida Solar Energy Center, Richard Raustad Apr 2018

Semi-Annual Program Progress Performance Report For University Transportation Systems Pppr#9, Florida Solar Energy Center, Richard Raustad

FSEC Energy Research Center®

The Electric Vehicle Transportation Center (EVTC) supports the U.S. Department of Transportation's strategic goal of planning for near-term integration of alternative fuel vehicles as a means to build a sustainable transportation system. The project objectives are to evaluate technologies, standards, planning and policies to ensure seamless integration of electric vehicles (EVs) into a complex transportation network and electricity grid. The EVTC bridges the gap between deployment of electric vehicles and the traditional transportation system.

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Battery Technologies For Mass Deployment Of Electric Vehicles, Florida Solar Energy Center, R. Paul Brooker Apr 2018

Battery Technologies For Mass Deployment Of Electric Vehicles, Florida Solar Energy Center, R. Paul Brooker

FSEC Energy Research Center®

Electric vehicle (EV) batteries have significantly improved since their inception. However, lifetime of these batteries is still strongly dependent on the usage profiles. This report describes aspects of EV battery utilization, and their impact on battery lifetime. Additionally, this report will describe potential future uses of EV batteries, particularly in vehicle-to-grid applications.

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Design And Implementation Of A Virtual Reality Laboratory For Mechanical Maintenance, Adolfo Enrique Samudio Cano Apr 2018

Design And Implementation Of A Virtual Reality Laboratory For Mechanical Maintenance, Adolfo Enrique Samudio Cano

Morehead State Theses and Dissertations

A thesis presented to the faculty of the College of the College of Business and Technology at Morehead State University in partial fulfillment of the requirements for the Degree Master of Science by Adolfo Enrique Samudio Cano on April 27, 2018.

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Novelis Teaching Table, Phillip Laplante, Robert Hemker, Taylor Mcgriff, Juan Restrepo, Shelly Abraham Apr 2018

Novelis Teaching Table, Phillip Laplante, Robert Hemker, Taylor Mcgriff, Juan Restrepo, Shelly Abraham

KSU Journey Honors College Capstones and Theses

Novelis is a company that specializes in metal casting, recycling, and rolling. They primarily focus on aluminum rolling for cans and car bodies but are an industry leader in numerous related areas. As the rolling process is not taught in most general engineering courses, Novelis periodically teaches new engineers and technicians about the specifics of this relatively mathematically complex process. Most of the current teaching methods are through PowerPoint presentations and group exercises, with minimal hands-on involvement. One of the most useful tools for teaching the rolling process is an actual jeweler’s rolling mill, which Novelis currently possesses, but is …

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In Situ Defect Detection Using Three Color Spectroscopy In Laser Powder Bed Additive Manufacturing, Andrew Drieling Apr 2018

In Situ Defect Detection Using Three Color Spectroscopy In Laser Powder Bed Additive Manufacturing, Andrew Drieling

The University Honors Program

Additive Manufacturing (AM) provides a way to create parts that would be extremely difficult or impossible with conventional manufacturing processes. However, AM also introduces defects, which are detrimental to the mechanical performance. These defects are potentially unknown until post-processing inspection and testing, wasting time and resources on an unusable part or initiating unexpected failure. Historically, spectroscopy has successfully been used for in situ monitoring of laser welding, using changing parameters in the generated plume to predict defects. In situ monitoring using a visible spectrometer for fabrication of Alloy 718 on a test bed laser powder bed fusion system is performed. …

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Rare Earth - Free Permanent Magnetic Material, Laura H. Lewis, Jeffrey E. Shield, Katayun Barmak Viziri Apr 2018

Rare Earth - Free Permanent Magnetic Material, Laura H. Lewis, Jeffrey E. Shield, Katayun Barmak Viziri

Department of Mechanical and Materials Engineering: Faculty Publications

The invention provides rare earth - free permanent magnetic materials and methods of making them . The materials can be used to produce magnetic structures for use in a wide variety of commercial applications , such as motors , generators , and other electromechanical and electronic devices . Magnets fabricated using the materials can be substituted for magnets requiring rare earth elements that are costly and in limited supply . The invention provides two different types of magnetic materials . The first type is based on an iron - nickel alloy that is doped with one or more doping elements …

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Implantable Fluid Delivery System, Ihab Saab, Nathan Waters, Joel Carne, Lanie R. Belloli, Massoud Tavakoli Apr 2018

Implantable Fluid Delivery System, Ihab Saab, Nathan Waters, Joel Carne, Lanie R. Belloli, Massoud Tavakoli

Mechanical Engineering Patents

An implantable system for delivering fluids , such as drugs , to one or more anatomical structures in a patient ' s ( i . e . , human or animal ) body . A number of medical conditions require continual and / or periodic administration of fluids ( e . g . , drugs ) to target regions ( e . g . , anatomic organs ) of the body . Accessibility to those target regions might be limited technically for ex . and not limited to : frequent endoscopic , radiologically guided or surgical approaches . The system …

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Understanding The Thermal Properties Of Precursor-Ionomers To Optimize Fabrication Processes For Ionic Polymer-Metal Composites (Ipmcs), Sarah Trabia, Kisuk Choi, Zakai Olsen, Taeseon Hwang, Jae-Do Nam, Kwang J. Kim Apr 2018

Understanding The Thermal Properties Of Precursor-Ionomers To Optimize Fabrication Processes For Ionic Polymer-Metal Composites (Ipmcs), Sarah Trabia, Kisuk Choi, Zakai Olsen, Taeseon Hwang, Jae-Do Nam, Kwang J. Kim

Mechanical Engineering Faculty Research

Ionic polymer-metal composites (IPMCs) are one of many smart materials and have ionomer bases with a noble metal plated on the surface. The ionomer is usually Nafion, but recently Aquivion has been shown to be a promising alternative. Ionomers are available in the form of precursor pellets. This is an un-activated form that is able to melt, unlike the activated form. However, there is little study on the thermal characteristics of these precursor ionomers. This lack of knowledge causes issues when trying to fabricate ionomer shapes using methods such as extrusion, hot-pressing, and more recently, injection molding and 3D printing. …

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Method Of Fabricating A Continuous Nanofiber, Yuris Dzenis Apr 2018

Method Of Fabricating A Continuous Nanofiber, Yuris Dzenis

Department of Mechanical and Materials Engineering: Faculty Publications

A method of fabricating a continuous nanofiber is described . The method includes preparing a solution of one or more polymers and one or more solvents and electrospinning the solution by discharging the solution through one or more liquid jets into an electric field to yield one or more continuous nanofibers . The electrospinning process ( i ) highly orients one or more polymer chains in the one or more continuous nanofibers along a fiber axis of the one or more continuous nanofibers , and ( ii ) suppresses polymer crystallization in the one or more continuous nanofibers . The …

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Evaluation Of A Novel Finite Element Model Of Active Contraction In The Heart, Xiaoyan Zhang, Zhan-Qiu Liu, Kenneth S. Campbell, Jonathan F. Wenk Apr 2018

Evaluation Of A Novel Finite Element Model Of Active Contraction In The Heart, Xiaoyan Zhang, Zhan-Qiu Liu, Kenneth S. Campbell, Jonathan F. Wenk

Mechanical Engineering Faculty Publications

Finite element (FE) modeling is becoming a widely used approach for the investigation of global heart function. In the present study, a novel model of cellular-level systolic contraction, which includes both length- and velocity-dependence, was implemented into a 3D non-linear FE code. To validate this new FE implementation, an optimization procedure was used to determine the contractile parameters, associated with sarcomeric function, by comparing FE-predicted pressure and strain to experimental measures collected with magnetic resonance imaging and catheterization in the ventricles of five healthy rats. The pressure-volume relationship generated by the FE models matched well with the experimental data. Additionally, …

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Uncertainty Evaluation In The Design Of Structural Health Monitoring Systems For Damage Detection, Christine Schubert Kabban, Richard Uber, Kevin Lin, Bin Li, Md Yeasin Bhuiyan, Victor Giurgiutiu Apr 2018

Uncertainty Evaluation In The Design Of Structural Health Monitoring Systems For Damage Detection, Christine Schubert Kabban, Richard Uber, Kevin Lin, Bin Li, Md Yeasin Bhuiyan, Victor Giurgiutiu

Faculty Publications

The validation of structural health monitoring (SHM) systems for aircraft is complicated by the extent and number of factors that the SHM system must demonstrate for robust performance. Therefore, a time- and cost-efficient method for examining all of the sensitive factors must be conducted. In this paper, we demonstrate the utility of using the simulation modeling environment to determine the SHM sensitive factors that must be considered for subsequent experiments, in order to enable the SHM validation. We demonstrate this concept by examining the effect of SHM system configuration and flaw characteristics on the response of a signal from a …

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Modeling Residual Stress Development In Hybrid Processing By Additive Manufacturing And Laser Shock Peening, Guru Charan Reddy Madireddy Apr 2018

Modeling Residual Stress Development In Hybrid Processing By Additive Manufacturing And Laser Shock Peening, Guru Charan Reddy Madireddy

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

The term “hybrid” has been widely applied to many areas of manufacturing. Naturally, that term has found a home in additive manufacturing as well. Hybrid additive manufacturing or hybrid-AM has been used to describe multi-material printing, combined machines (e.g., deposition printing and milling machine center), and combined processes (e.g., printing and interlayer laser re-melting). The capabilities afforded by hybrid-AM are rewriting the design rules for materials and adding a new dimension in the design for additive manufacturing paradigm. This work focuses on hybrid-AM processes, which are defined as the use of additive manufacturing (AM) with one …

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Effect Of Shot Peening On Stress Corrosion Behavior Of Biodegradable Magnesium We43, Tejaswita Patil Apr 2018

Effect Of Shot Peening On Stress Corrosion Behavior Of Biodegradable Magnesium We43, Tejaswita Patil

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

Conventionally used metals for orthopedic devices made of titanium, stainless steel, and Co-Cr alloys are designed to be permanently implanted. However, long-term complications arise and a secondary implant removal surgery is often necessary. A mismatch in stiffness between the bone and implant results in stress shielding that negatively affects bone density. To overcome these problems, magnesium alloys (e.g., WE34) are favored due to a lower Young’s modulus (45 GPa) and biodegradability. The critical technical barrier with magnesium alloys is their high corrosion rate in physiological (salt-based) environments. One solution is to use surface treatments, such as shot peening (SP), to …

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Numerical Simulation Of A High Strain Rate Biaxial Compression Apparatus, Michael Lagieski Apr 2018

Numerical Simulation Of A High Strain Rate Biaxial Compression Apparatus, Michael Lagieski

McKelvey School of Engineering Graduate Student Theses & Dissertations

Few experimental methods today are capable of exploring the strength of materials at high strain rates (105 s-1). Those that are capable, such as the Split Hopkinson Bar, Taylor Anvil and Plate Impact suffer from instability and are generally limited to one dimensional wave propagation. Of particular interest is material response under biaxial compression, similar to that seen in inertial confinement fusion. Laser fusion fuel pellets typically undergo large strain rates as well as plastic deformation and non-linear behavior. This work briefly outlines an experimental procedure designed to replicate these large strain rates under biaxial compression using …

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The Use Of Fe3o4/Carbon Composite Fibers As Anode Materials In Lithium Ion Batteries, Howard Campos, Jonathan Ayala, Carolina Valdes, Jason Parsons, Mataz Alcoutlabi Apr 2018

The Use Of Fe3o4/Carbon Composite Fibers As Anode Materials In Lithium Ion Batteries, Howard Campos, Jonathan Ayala, Carolina Valdes, Jason Parsons, Mataz Alcoutlabi

Mechanical Engineering Faculty Publications

In the present work, results on the synthesis and mass production of polymer/ceramic composite fibers through Forcespinning® (FS) are reported. Magnetite (Fe3O4), has been considered as a good anode material for Lithium‒Ion Batteries (LIBs) due to its high theoretical capacity (~924 mAhg-1), low cost, and low toxicity. The Fe3O4/carbon composite, in the present study, was achieved through Forcespinning iron (III) acetylacetonate /polyacrylonitrile (PAN) precursor solution with stabilization in air at 280°C followed by carbonization at 600°C under argon. The electrochemical cyclic performance of Fe3O4/C composite fibers was investigated by galvanostatic charge/discharge experiments. The results showed the Fe3O4/C composite fiber anode …

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Computational Validation Of Aerodynamic Paramenters On A Multi-Sided Cylinder, Christopher Ong Apr 2018

Computational Validation Of Aerodynamic Paramenters On A Multi-Sided Cylinder, Christopher Ong

Master's Theses

There are fundamental problems in fluid dynamics. One common problem is fluid flow around cylinder-shaped bodies which range from circular to multi-sided polygons. These basic geometric shapes are found in various applications. With the increased availability of computational power, the use of Computational Fluid Dynamics (CFD) becomes an avenue for studying fluid flow around theses shapes. The fluid flow over cylindrical bodies is a widely studied problem used to validate the accuracy and reliability of CFD codes before working on more complex engineering problems. This validation is done by comparing selected flow parameters to experimental results to determine the accuracy …

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Structural Reinforcement Of Streamline Tubing, Peter Grohs Apr 2018

Structural Reinforcement Of Streamline Tubing, Peter Grohs

Honors Theses

Structural integrity of suspension components is important to the safety and the longevity of vehicles. Streamline tubing, an aerodynamically shaped material used in high performance vehicle controls, can be prone to failure if not properly analyzed for its asymmetric geometry. The component was redesigned as a composite structure using modern materials to make a highly aerodynamic product stiffer, stronger, and lighter per unit weight than a conventional all steel design. Finite element analysis was conducted and five prototypes using different materials were constructed and tested. This method of maximizing component lightness and stiffness using the beneficial properties of each material …

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Design Of Force Versus Displacement Test Stand, Andrew Fritchley Apr 2018

Design Of Force Versus Displacement Test Stand, Andrew Fritchley

Honors Theses

Performing mechanical design around sensors is a critical skill which all engineering students should be familiar with. Of equal importance is gathering and correctly interpreting electrical data from engineering tests. The aim of this project is to design a force versus displacement test stand for applications related to the measurement of spring force-displacement correlation. The design uses a strain gauge load cell, and a magnetic linear encoder to provide accurate, repeatable force and travel measurements. A mechanical design to mount each sensor was created based initial project constraints. Finite element analysis was performed on all critical components to ensure that …

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Evolution Of Mg Az31 Twin Activation With Strain: A Machine Learning Study, Andrew D. Orme Apr 2018

Evolution Of Mg Az31 Twin Activation With Strain: A Machine Learning Study, Andrew D. Orme

Undergraduate Honors Theses

Machine learning is being adopted in various areas of materials science to both create predictive models and to uncover correlations which reveal underlying physics. However, these two aims are often at odds with each other since the resultant predictive models generally become so complex that they can essentially be described as a black box, making them difficult to understand. In this study, complex relationships between microstructure and twin formation in AZ31 magnesium are investigated as a function of increasing strain. Supervised machine learning is employed, in the form of J-48 decision trees. In one approach, strain is incorporated as an …

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The Water Entry Of Multi-Droplet Streams And Jets, Nathan B. Spiers, Zhao Pan, Jesse Belden, Tadd T. Truscott Apr 2018

The Water Entry Of Multi-Droplet Streams And Jets, Nathan B. Spiers, Zhao Pan, Jesse Belden, Tadd T. Truscott

Mechanical and Aerospace Engineering Faculty Publications

Water entry has been studied for over a century, but few studies have focused on multiple droplets impacting on a liquid bath sequentially. We connect multi-droplet streams, jets and solid objects with physical-based scaling arguments that emphasize the intrinsically similar cavities. In particular, the cavities created by the initial impact of both droplet streams and jets on an initially quiescent liquid pool exhibit the same types of cavity seal as hydrophobic spheres at low Bond number, some of which were previously unseen for jets and droplet streams. Low-frequency droplet streams exhibit an additional three new cavity seal types unseen for …

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Hawai'i Wildlife Fund V. County Of Maui, Lowell J. Chandler Apr 2018

Hawai'i Wildlife Fund V. County Of Maui, Lowell J. Chandler

Public Land & Resources Law Review

In Hawai’i Wildlife Fund v. County of Maui, the Ninth Circuit held that the plain language of the Clean Water Act provides jurisdiction over indirect discharges of pollutants from a point source into groundwater that is shown to be connected to navigable waters. The court found that studies confirmed pollutants entering the Pacific Ocean were fairly traceable to the County of Maui’s sewage disposal wells. In affirming the district court’s ruling, the Ninth Circuit held that Maui County violated the Clean Water Act by discharging pollutants into a navigable water without the required permit. The court also concluded the …

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Virtual Reality Power Chair Simulator For Human Operator Modeling And Tremor Filtering, Rick Meyer Apr 2018

Virtual Reality Power Chair Simulator For Human Operator Modeling And Tremor Filtering, Rick Meyer

Faculty Research and Creative Activities Award (FRACAA)

Approximately 180,000 persons who have a need for a powered wheelchair (PWC) suffer from Parkinson's’ hand tremor that makes it difficult, even potentially dangerous, for them to operate it. Persons with hand tremor that attempt to operate a PWC have to try to compensate for their tremor, which may not be realistically possible if the tremor is severe enough. Hand tremor can lead to sudden changes in PWC joystick commands that could result in unsafe PWC movements and collisions resulting in injury and/or property damage. These tremor sufferers are candidates for an assistive PWC. As a step toward assistive PWC, …

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Exploring The Use Of 3d Scanning To Determine Whole-Body Volume While Wearing A Triathlon Wetsuit, Leland Barker, Diego Medoza, John A. Mercer Apr 2018

Exploring The Use Of 3d Scanning To Determine Whole-Body Volume While Wearing A Triathlon Wetsuit, Leland Barker, Diego Medoza, John A. Mercer

Kinesiology and Nutrition Sciences Faculty Research

Background: Commercial 3 Dimension (3D) scanners are relatively new to anthropometry. The purpose of this study was to explore ability of using a 3D imaging instrument to measure body volume with and without wearing a wetsuit. Three experiments were conducted to achieve this purpose: (1) to determine if the 3D imaging instrument could accurately measure volume of static objects; (2) to determine the resolution of accuracy of measuring volume of static objects; and (3) to compare whole-body volume of wearing a wetsuit using 3D imaging as well as another body volume measure (air displacement technique). Methods: Three experiments were performed: …

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Reducing Stress In 3d Printed Parts Made With Laser Engineered Net Shaping, Shaun Ross Whetten Apr 2018

Reducing Stress In 3d Printed Parts Made With Laser Engineered Net Shaping, Shaun Ross Whetten

Mechanical Engineering ETDs

Thermal cycling and repeated melting/solidification cycles characteristic of 3D metal printing processes causes buildup of residual stress in 3D printed parts. Using laser engineered net shaping (LENS®), residual stresses are formed leading to deformation and possible cracking of the 3D printed metal components. The LENS process offers opportunities for rapid prototyping, alternative manufacturing processes, and repair of worn/broken components so it is important to be able to minimize the effects of residual stress. Work was performed to understand the benefit of substrate heating on reducing residual stress in metal parts made using the LENS process. Substrate deformation, and destructive methods …

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Method For Data - Driven Learning - Based Control Of Hvac Systems Using High - Dimensional Sensory Observations, Amir-Massoud Farahmand, Saleh Nabi, Piyush Grover, Daniel Nikolaev Nikovski Apr 2018

Method For Data - Driven Learning - Based Control Of Hvac Systems Using High - Dimensional Sensory Observations, Amir-Massoud Farahmand, Saleh Nabi, Piyush Grover, Daniel Nikolaev Nikovski

Department of Mechanical and Materials Engineering: Faculty Publications

A controller for controlling an operation of an air - conditioning system conditioning an indoor space includes a data input to receive state data of the space at multiple points in the space , a memory to store a code of a reinforcement learning algorithm and a history of the state data and a history of control commands having been applied to the air - conditioning system , wherein the history of the control commands is associated with the state data and history of rewards , a processor coupled to the memory determines a value function outputting a cumulative value …

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Uncertainty In Optical Particulate Counting Sensors, Jared Todd Blanchard Apr 2018

Uncertainty In Optical Particulate Counting Sensors, Jared Todd Blanchard

Undergraduate Honors Theses

To mitigate the health problems and environmental damage caused by the burning of biomass in homes across the developing world, there is an international effort to design clean burning cookstoves that burn with greater efficiency and emit fewer harmful substances. An important tool for gauging the effectiveness of these alternate stoves is the optical particulate counting (OPC) sensor, which comes in many varieties. To facilitate comparison between measurements from different models, a mathematical model and uncertainty analysis method for OPC’s have been developed. These may be applied to any light-scattering OPC. In addition, a low-cost physical system was developed to …

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Design Optimization For A Cnc Machine, Alin Resiga Apr 2018

Design Optimization For A Cnc Machine, Alin Resiga

Dissertations and Theses

Minimizing cost and optimization of nonlinear problems are important for industries in order to be competitive. The need of optimization strategies provides significant benefits for companies when providing quotes for products. Accurate and easily attained estimates allow for less waste, tighter tolerances, and better productivity. The Nelder-Mead Simplex method with exterior penalty functions was employed to solve optimum machining parameters. Two case studies were presented for optimizing cost and time for a multiple tools scenario. In this study, the optimum machining parameters for milling operations were investigated. Cutting speed and feed rate are considered as the most impactful design variables …

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Scalable Patterning Using Laser-Induced Shock Waves, Saidjafarzoda Ilhom, Khomidkhodza Kholikov, Peizhen Li, Claire Ottman, Dylan Sanford, Zachary Thomas, Omer San, Haluk E. Karaca, Ali O. Er Apr 2018

Scalable Patterning Using Laser-Induced Shock Waves, Saidjafarzoda Ilhom, Khomidkhodza Kholikov, Peizhen Li, Claire Ottman, Dylan Sanford, Zachary Thomas, Omer San, Haluk E. Karaca, Ali O. Er

Mechanical Engineering Faculty Publications

An advanced direct imprinting method with low cost, quick, and minimal environmental impact to create a thermally controllable surface pattern using the laser pulses is reported. Patterned microindents were generated on Ni50Ti50 shape memory alloys and aluminum using an Nd: YAG laser operating at 1064 nm combined with a suitable transparent overlay, a sacrificial layer of graphite, and copper grid. Laser pulses at different energy densities, which generate pressure pulses up to a few GPa on the surface, were focused through the confinement medium, ablating the copper grid to create plasma and transferring the grid pattern onto …

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Systematic Design And Experimental Demonstration Of Bianisotropic Metasurfaces For Scattering-Free Manipulation Of Acoustic Wavefronts., Junfei Li, Chen Shen, Ana Díaz-Rubio, Sergei A Tretyakov, Steven A Cummer Apr 2018

Systematic Design And Experimental Demonstration Of Bianisotropic Metasurfaces For Scattering-Free Manipulation Of Acoustic Wavefronts., Junfei Li, Chen Shen, Ana Díaz-Rubio, Sergei A Tretyakov, Steven A Cummer

Henry M. Rowan College of Engineering Departmental Research

Recent advances in gradient metasurfaces have shown that by locally controlling the bianisotropic response of the cells one can ensure full control of refraction, that is, arbitrarily redirect the waves without scattering into unwanted directions. In this work, we propose and experimentally verify the use of an acoustic cell architecture that provides enough degrees of freedom to fully control the bianisotropic response and minimizes the losses. The versatility of the approach is shown through the design of three refractive metasurfaces capable of redirecting a normally incident plane wave to 60°, 70°, and 80° on transmission. The efficiency of the bianisotropic …

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Numerical Investigation Of Performance Of Ducted Dual Rotor Wind Turbine, Ahmed Elbaz Apr 2018

Numerical Investigation Of Performance Of Ducted Dual Rotor Wind Turbine, Ahmed Elbaz

Mechanical Engineering

Dual rotor wind turbine system presents higher energy extraction rates from wind.  In the present study, it is proposed to utilize the dual rotor configuration in a ducted system using wind lens in order to enable its applications at regions of low wind speeds. The aerodynamic performance of ducted dual rotor wind turbine is investigated using CFD modelling to solve 3-D turbulent-steady incompressible flow. Mesh independent study was made to ensure the accuracy and validate the results. Detailed investigations of the effect of lens on wind turbine performance in different configurations are presented and analyzed. Power curves are presented and …

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