A Control-Chart Based Method For Solder Joint Crack Detection - Conference Proceeding,
2014
California Polytechnic State University - San Luis Obispo
A Control-Chart Based Method For Solder Joint Crack Detection - Conference Proceeding, Jianbiao Pan
Industrial and Manufacturing Engineering
Many researchers have used different failure criteria in the published solder joint reliability studies. Since the reported time-to-failure would be different if different failure criteria were used, it would be difficult to compare the reported reliability life of solder joints from one study to another. The purpose of this study is to evaluate the effect of failure criteria on the reported thermal fatigue life and find out which failure criterion can detect failure sooner. First, the application of the control-chart based method in a thermal cycling reliability study is described. The reported time-to-failure data were then compared based on four …
Design Of Transportation Process For Band Equipment,
2014
California Polytechnic State University - San Luis Obispo
Design Of Transportation Process For Band Equipment, Marissa N. Blustein, Chris M. Kaye
Industrial and Manufacturing Engineering
The following report documents the attempt to design a safe and reliable process for transporting Louder Space’s musical gear that requires minimal physical demand. Design specifications were derived from customer requirements as well as human factors principles. The transportation process was broken down into systematic process steps and standardized, making use of lean methodologies in order to reduce the number of non-value steps involved. Furthermore, a model portable storage unit for miscellaneous gear was developed to the specifications determined by the band using 3D modeling, as well as certain limiting constraints. Once the customer approved the prototype, the product was …
Hydrogen Fueling Stations Infrastructure,
2014
Florida Solar Energy Center
Hydrogen Fueling Stations Infrastructure, Florida Solar Energy Center, Nan Qin
FSEC Energy Research Center®
Fuel Cell Electric Vehicles (FCEVs) can provide customers with the benefits of low to zero greenhouse gas emissions, high performance, and comfort without compromising range and refill time. With three major automakers (Honda, Hyundai, and Toyota) planning to introduce consumer FCEVs by the end of 2015, FCEVs will play an increasingly important role in the electric vehicle arena. Building hydrogen fueling infrastructure has been identified as a major obstacle in FCEV commercialization. This report is part of an ongoing effort within an Electric Vehicle Transportation Center (EVTC) project: "Fuel Cell Vehicle Technologies, Infrastructure and Requirements." This report is based on …
Characterizing Phantom Arteries With Multi-Channel Laser Ultrasonics And Photo-Acoustics,
2014
Boise State University
Characterizing Phantom Arteries With Multi-Channel Laser Ultrasonics And Photo-Acoustics, Jami L. Johnson, Kasper Van Wijk, Michelle Sabick
Mechanical and Biomedical Engineering Faculty Publications and Presentations
Multi-channel photo-acoustic and laser ultrasonic waves are used to sense the characteristics of proxies for healthy and diseased vessels. The acquisition system is non-contacting and non-invasive with a pulsed laser source and a laser vibrometer detector. As the wave signatures of our targets are typically low in amplitude, we exploit multi-channel acquisition and processing techniques. These are commonly used in seismology to improve the signal-to-noise ratio of data. We identify vessel proxies with a diameter on the order of 1 mm, at a depth of 18 mm. Variations in scattered and photo-acoustic signatures are related to differences in vessel wall …
Numerical Analysis Of Cold Injury Of Skin In Cryogen Spray Cooling For Laser Dermatologic Surgery,
2014
University of Akron Main Campus
Numerical Analysis Of Cold Injury Of Skin In Cryogen Spray Cooling For Laser Dermatologic Surgery, Dong Li, Bin Chen, Wen-Juan Wu, Ya-Ling He, Lin Zhuang Xing, Guo-Xiang Wang
Mechanical Engineering Faculty Research
In laser dermatologic surgery, cryogen spray cooling (CSC) is used to avoid unwanted thermal damage such as scars from skin burning due to the melanin absorption of the laser beam. As the cryogen is fully atomized from the nozzle, temperature of the droplets can quickly drop below -60 oC because of evaporation. Such low temperature may lead to cold injury of skin. Therefore, spray cooling process should be accurately controlled during clinical practice to achieve sufficient protection and avoid cold injury. This study presents a numerical analysis for cold injury of skin in cryogen spray cooling for dermatologic laser surgery …
U-Pu-Zr Alloy Design By Ternary Potts-Phase Field Modeling,
2014
Brigham Young University - Provo
U-Pu-Zr Alloy Design By Ternary Potts-Phase Field Modeling, Jordan Jeffrey Cox
Theses and Dissertations
U-Pu-Zr nuclear fuels experience a redistribution of constituents and a number of phase transformations when subjected to the thermal gradient present in nuclear reactors. This redistribution and phase separation leads to several undesirable fuel performance issues. In an effort to better understand how different alloys compositions are affected by this thermal gradient, we utilize the recently introduced Hybrid Potts-phase Field Method to study the U-Pu-Zr system. The recently introduced Hybrid method couples microstructural and compositional evolutions of a system so that the two phenomena can be studied together rather than separately, as is frequently done. However, simulation of the U-Pu-Zr …
Experimental Study On Influence Of Pitch Motion On The Wake Of A Floating Wind Turbine Model,
2014
University of Oldenburg
Experimental Study On Influence Of Pitch Motion On The Wake Of A Floating Wind Turbine Model, Stanislav Rockel, Elizabeth Camp, Jonas Schmidt, Joachim Peinke, Raúl Bayoán Cal, Michael Höllimg
Mechanical and Materials Engineering Faculty Publications and Presentations
Wind tunnel experiments were performed, where the development of the wake of a model wind turbine was measured using stereo Particle Image Velocimetry to observe the influence of platform pitch motion. The wakes of a classical bottom fixed turbine and a streamwise oscillating turbine are compared. Results indicate that platform pitch creates an upward shift in all components of the flow and their fluctuations. The vertical flow created by the pitch motion as well as the reduced entrainment of kinetic energy from undisturbed flows above the turbine result in potentially higher loads and less available kinetic energy for a downwind …
2014 (Spring) Ensi Informer Magazine,
2014
Morehead State University
2014 (Spring) Ensi Informer Magazine, Morehead State University. Engineering Sciences Department
ENSI Informer Magazine Archive
The ENSI Informer Magazine published in the spring of 2014.
Me-Em Enewsbrief, March 2014,
2014
Michigan Technological University
Me-Em Enewsbrief, March 2014, Department Of Mechanical Engineering-Engineering Mechanics, Michigan Technological University
Department of Mechanical and Aerospace Engineering eNewsBrief
No abstract provided.
Aircraft Route Optimization For Formation Flight,
2014
Stanford University
Aircraft Route Optimization For Formation Flight, Jia Xu, Andrew Ning, Geoffrey Bower, Ilan Kroo
Faculty Publications
We quantify the fuel and cost benefits of applying extended formation flight to com- mercial airline operations. Central to this study is the development of a bi-level, mixed integer-real formation flight optimization framework. The framework has two main components: 1) a continuous domain aircraft mission performance optimization and 2) an integer optimization component that selects the best combination of optimized missions to form a formation flight schedule. The mission performance reflects the effects of rolled-up wakes, formation heterogeneity, and formation-induced compressibility. The results show that an airline can use formation flight to reduce fuel burn by 5.8% or direct operating …
Passive Biaxial Mechanical Properties And In Vivo Axial Pre-Stretch Of The Diseased Human Femoropopliteal And Tibial Arteries,
2014
University of Nebraska Medical Center
Passive Biaxial Mechanical Properties And In Vivo Axial Pre-Stretch Of The Diseased Human Femoropopliteal And Tibial Arteries, Alexey Kamenskiy, Iraklis I. Pipinos, Yuris A. Dzenis, Clay Lomneth, Syed A. Jaffar Kazmi, Nicholas Y. Phillips, Jason N. Mactaggart
Department of Mechanical and Materials Engineering: Faculty Publications
Surgical and interventional therapies for atherosclerotic lesions of the infrainguinal arteries are notorious for high rates of failure. Frequently, this leads to expensive reinterventions, return of disabling symptoms, or limb loss. Interaction between the artery and repair material likely plays an important role in reconstruction failure, but data describing the mechanical properties and functional characteristics of human femoropopliteal and tibial arteries are currently not available. Diseased superficial femoral (SFA, n=10), popliteal (PA, n=8), and tibial arteries (TA, n=3) from 10 patients with critical limb ischemia were tested to determine passive mechanical properties using planar biaxial extension. All …
Assessing The Impact Of Water Filters And Improved Cook Stoves On Drinking Water Quality And Household Air Pollution: A Randomised Controlled Trial In Rwanda,
2014
London School of Hygiene and Tropical Medicine
Assessing The Impact Of Water Filters And Improved Cook Stoves On Drinking Water Quality And Household Air Pollution: A Randomised Controlled Trial In Rwanda, Ghislaine Rosa, Fiona Majorin, Sophie Boisson, Christina Barstow, Michael Johnson, Miles Kirby, Fidele Ngabo, Evan A. Thomas, Thomas Clasen
Mechanical and Materials Engineering Faculty Publications and Presentations
Diarrhea and respiratory infections remain the biggest killers of children under 5 years in developing countries. We conducted a 5-month household randomised controlled trial among 566 households in rural Rwanda to assess uptake, compliance and impact on environmental exposures of a combined intervention delivering high-performance water filters and improved stoves for free. Compliance was measured monthly by self-report and spot-check observations. Semicontinuous 24-h PM2.5 monitoring of the cooking area was conducted in a random subsample of 121 households to assess household air pollution, while samples of drinking water from all households were collected monthly to assess the levels of thermotolerant …
Decreasing The Power Consumption Of Hybrid Electric Vehicle Architectures,
2014
Embry-Riddle Aeronautical University
Decreasing The Power Consumption Of Hybrid Electric Vehicle Architectures, Domenic Leo Barsotti
Doctoral Dissertations and Master's Theses
This paper presents the challenges seen by current automotive manufacturers in their investigation of more fuel efficient vehicles. The two main areas for improvement are aerodynamics and passive cooling of electrical systems. Aerodynamics of an Ahmed body is investigated with a drag reduction system proposed utilizing slot jets at the rear of the bluff body . Two separate systems show a decrease in drag of 16 and 25%. The paper also investigates the use of a phase change material for a hybrid electric vehicles energy storage system cooling. Phase change materials take advantage of the latent heat of fusion to …
Hemocompatibility Comparison Of Biomedical Grade Polymers Using Rabbit Thrombogenicity Model For Preparing Nonthrombogenic Nitric Oxide Releasing Surfaces,
2014
University of Georgia
Hemocompatibility Comparison Of Biomedical Grade Polymers Using Rabbit Thrombogenicity Model For Preparing Nonthrombogenic Nitric Oxide Releasing Surfaces, Hitesh Handa, Terry C. Major, Elizabeth Brisbois, Kagya Amoako, Mark E. Meyerhoff, Robert E. Bartlett
Mechanical and Industrial Engineering Faculty Publications
Nitric oxide (NO) is an endogenous vasodilator as well as natural inhibitor of platelet adhesion/ activation. Nitric oxide releasing (NOrel) materials can be prepared by doping an NO donor species, such as diazeniumdiolated dibutylhexanediamine (DBHD/N2O2), within a polymer coating. The inherent hemocompatibility properties of the base polymer can also influence the efficiency of such NO release coatings. In this study, four biomedical grade polymers were evaluated in a 4 h rabbit model of thrombogenicity for their effects on extracorporeal circuit thrombus formation and circulating platelet count. At the end of 4 h, Elast-Eon E2As was found to preserve 58% of …
Frequency-Limited Adaptive Control Of A Generic Transport Model In The Presence Of System Uncertainty And Losses In Control Effectiveness,
2014
Missouri University of Science and Technology
Frequency-Limited Adaptive Control Of A Generic Transport Model In The Presence Of System Uncertainty And Losses In Control Effectiveness, Gerardo De La Torre, Tansel Yucelen, Wassim M. Haddad, Eric N. Johnson
Mechanical and Aerospace Engineering Faculty Research & Creative Works
While adaptive control has been used in numerous applications to achieve system performance without excessive reliance on dynamical system models, the necessity of high-gain learning rates for safety-critical systems to achieve fast adaptation can be a serious limitation of most adaptive controllers. In order to address this problem, two novel adaptive control approaches developed recently aim to limit the bandwidth of the closed-loop adaptive control system in order to suppress the high-frequency content contained in the system error dynamics and adaptation algorithms. Specifically, this key feature of these frameworks allows for robust and fast adaptation by utilizing high-gain learning rates …
Methods, Systems, And Devices For Surgical Access And Inserton,
2014
University of Nebraska - Lincoln
Methods, Systems, And Devices For Surgical Access And Inserton, Tom Frederick, Shane Farritor, Jack Mondry, Eric Markvicka, Dmitry Oleynikov, Jacob Greenburg
Department of Mechanical and Materials Engineering: Faculty Publications
The various embodiments herein relate to systems, devices, and/or methods relating to Surgical procedures, and more specifically for accessing an insufflated cavity of a patient and/or positioning Surgical systems or devices into the cavity.
Energy And Peak Power Reduction From Air Misting Products Applied To Commercial Condensing Units In Hot And Humid Climates,
2014
Florida Solar Energy Center
Energy And Peak Power Reduction From Air Misting Products Applied To Commercial Condensing Units In Hot And Humid Climates, Florida Solar Energy Center, Charles Withers, Jr.
FSEC Energy Research Center®
A proprietary research project was conducted to evaluate the potential annual and peak energy reduction resulting from the addition of a water misting system applied to supermarket condenser coils in the Florida Power and Light service territory. Tests were performed to evaluate the performance of a mist system under various outdoor conditions over an eight-month period in a hot and humid climate zone. The project measured an average of 2.8% percentage energy savings and average 3.2% utility peak demand reduction. The report discusses why hot and humid climates can expect much lower savings compared to hot and arid climates. One …
Development Of A Method Of Obtaining Fluid Temperature Measurements Using A Laser,
2014
Brigham Young University
Development Of A Method Of Obtaining Fluid Temperature Measurements Using A Laser, Scott L. Thomson, Dr. Dan Maynes
Journal of Undergraduate Research
Developing a method of measuring fluid temperature using a laser-based system was the goal of this research project. The following paragraphs summarize the research procedure, results, and plans for future development.
Development Of A One-Piece, Aramid-Polyurethane Bumper System For Automobiles,
2014
Brigham Young University
Development Of A One-Piece, Aramid-Polyurethane Bumper System For Automobiles, Brent Zollinger, Dr. Christopher Rotz
Journal of Undergraduate Research
The automobile bumper system—consisting primarily of a decorative fascia, structural cross-beam, and energy absorber—is an ideal candidate for redesign using advanced technology. This report examines a concept that integrates the three main components of the bumper system into one by using high-performance materials. A one-piece, aramid-polyurethane composite bumper system that can be manufactured using the SRIM process offers possible weight reductions, cost reductions, and styling versatility, while maintaining manufacturability.
Fluidic Compression In A Scramjet Engine,
2014
Brigham Young University
Fluidic Compression In A Scramjet Engine, Jeff S. Noall, Dr. Russell L. Daines
Journal of Undergraduate Research
A scramjet (supersonic-combustion ramjet) is a theoretical engine which, like a ramjet, converts the velocity of the inlet air into pressure. This “ram” pressure compresses the fluid stream entering the engine prior to fuel injection and combustion. In a ramjet, the incoming air is slowed to subsonic speeds (speeds less than the speed of sound) before combustion occurs. In a scramjet, the air stream remains supersonic throughout the process. This feature gives the scramjet potential in high-speed applications such as hypersonic aircraft and space-transport systems. One of the main problems facing scramjet development is controlling the behavior of the shock …
