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Articles 16411 - 16440 of 30252

Full-Text Articles in Mechanical Engineering

Molten Metal Loop Driven By Electromagnetic Pump, Dominic Espiritu, Dor Granek, Jerald Moore, Scott Torres Jan 2015

Molten Metal Loop Driven By Electromagnetic Pump, Dominic Espiritu, Dor Granek, Jerald Moore, Scott Torres

Capstone Design Expo Posters

The first challenge of this proposed study was the gauges for the loop, which were not functioning properly and giving off inaccurate data due to a loop flow issue. Therefore a new loop design, including gauges, was created to gather accurate data for the electromagnetic pump. The electromagnetic pump used in this experiment differs from the standard electromagnetic motors by using rare earth magnets set into opposing steel plates that rotate simultaneously. Accurate data from the velocity and pressure gauges is necessary so the correlation between the EM pump’s speed and the flow velocity could be calculated. This technology could …

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Fsae Rear Diffuser Team, Zarwan Waqar, Sohail Hossini, Saman Usodan Jan 2015

Fsae Rear Diffuser Team, Zarwan Waqar, Sohail Hossini, Saman Usodan

Capstone Design Expo Posters

To generate additional force that is applied to the rear of the FSAE race car The importance of the rear diffuser is to add a rear force to the vehicle. The rear force is generated from the airflow coming from underneath the vehicle. The way the airflow creates a force is through generating a pressure differential in which the air exiting the rear of the race car is now causing a downward force from the diffuser. The use of a diffuser is known to be of use at high speeds and if designed correctly creating the aerodynamics needed to keep …

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Multi-Period Cell Loading And Job Sequencing In A Cellular Manufacturing System, Gokhan Egilmez, Gürsel A. Süer Jan 2015

Multi-Period Cell Loading And Job Sequencing In A Cellular Manufacturing System, Gokhan Egilmez, Gürsel A. Süer

Mechanical and Industrial Engineering Faculty Publications

In this paper, a multi-period cell loading problem is addressed, where the objectives are to minimise the number of tardy jobs (nT) in a multi-period planning horizon and optimise the scheduling of tardy jobs. Three cell loading and job scheduling strategies are proposed and tested with two newly developed mixed integer programming models. Additionally, three types of due dates (tight, medium and loose) and three different demand levels were considered. Finally, two tardy job assignment methods were proposed to observe the impact on nT. Case problems were solved based on minimising nT, Tmax …

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Main Body Aerodynamics, Michael Al-Badini, Christopher Buettner, Wesley Russell, Steven Summerville, Marcus Wardlow Jan 2015

Main Body Aerodynamics, Michael Al-Badini, Christopher Buettner, Wesley Russell, Steven Summerville, Marcus Wardlow

Capstone Design Expo Posters

Our senior design project entails designing, analyzing the front upper aerodynamic nose for the Formula SAE at VCU’s race team. Currently there are no provisions on the chassis to provide relief for parasitic loss of speed & efficiency due to drag. Since Formula SAE is focused on building a engineered, safe, and efficient vehicle our aerodynamic design will help with handling, downforce, and fuel economy all while reducing drag. Our Aerodynamic design will play a key role not only in how the Formula car is perceived aesthetically, but our calculations will be a large determining factor in the cars overall …

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Lower Body Exoskeleton Powered By Epidermal Electronics Systems, Francis Azari, Forrest Baber, Saswat Mishra, Karan Patel, Juan Soto Jan 2015

Lower Body Exoskeleton Powered By Epidermal Electronics Systems, Francis Azari, Forrest Baber, Saswat Mishra, Karan Patel, Juan Soto

Capstone Design Expo Posters

The purpose of our design revolves around the concept of enhancing the human body through the use of a lower body exoskeleton. The most applicable demographics for our design consists of paraplegics and non-paraplegics. The various uses we hope to include would allow the user to: walk again, lift heavier loads with the ability to move forward, back and be seated. Although lower body exoskeletons already exist on the market, they still have shortcomings that prevent widespread use among the general public. Our hope is to improve upon the design of existing exoskeletons with the integration of epidermal electronic systems …

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Methods Of Extrusion On Demand For High Solids Loading Ceramic Paste In Freeform Extrusion Fabrication, Wenbin Li, Amir Ghazanfari, Ming Leu, Robert Landers Jan 2015

Methods Of Extrusion On Demand For High Solids Loading Ceramic Paste In Freeform Extrusion Fabrication, Wenbin Li, Amir Ghazanfari, Ming Leu, Robert Landers

Faculty Publications, Mechanical Engineering

Fabrication of highly dense parts with complex geometry by paste-extrusion-based solid freeform fabrication processes requires a precise control of the extrusion flow rate to dispense material on demand, which is often referred as Extrusion-On-Demand (EOD). The extrusion process for aqueous ceramic pastes is complex and difficult to control due to their non-Newtonian behavior, compressibility and inhomogeneity. In this study, three methods of EOD (based on ram extruder, needle valve, and auger valve) are introduced and investigated for the extrusion of high solids loading (i.e., >50%, volumetric) aqueous alumina paste. Optimal extrusion process parameters for these methods are determined through printing …

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Optimal Rastering Orientation In Freeform Extrusion Fabrication Processes, Amir Ghazanfari, Wenbin Li, Ming Leu, Robert Landers Jan 2015

Optimal Rastering Orientation In Freeform Extrusion Fabrication Processes, Amir Ghazanfari, Wenbin Li, Ming Leu, Robert Landers

Faculty Publications, Mechanical Engineering

Many researchers have tried to optimize the build direction of additively manufactured parts to minimize the vertical staircase effect. However, the horizontal staircase effect should also be considered when fully dense parts are to be fabricated. In this paper, part inaccuracy due to the horizontal staircase effect is considered in order to determine the optimal rastering orientation in building the part. An algorithm is developed to estimate this inaccuracy and a technique is proposed to minimize it. The effect of rastering orientation on staircase errors is examined, and the particle swarm optimization method is used to determine the optimum rastering …

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Thermally Induced Motion, Collision And Mixing Of Levitated Droplets, Ashkan Davanlou Jan 2015

Thermally Induced Motion, Collision And Mixing Of Levitated Droplets, Ashkan Davanlou

Electronic Theses and Dissertations

This dissertation investigates the motion of a levitated droplet experimentally and analytically against the Marangoni flow in an immiscible outer fluid at higher speeds than is possible currently. Based on our earlier experiments, when a droplet is released from a height of 1.5 – 4 times its diameter from the liquid surface, it can overcome the impact and stay levitated at the liquid-air interface due to the existence of an air gap between the droplet and the liquid film. In order to explain this behavior of droplet traveling against the counter-current motion, we propose a simple approach: first, the Marangoni …

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Biomechanics Of Developmental Dysplasia Of The Hip - An Engineering Study Of Closed Reduction Utilizing The Pavlik Harness For A Range Of Subtle To Severe Dislocations In Infants., Victor Huayamave Jan 2015

Biomechanics Of Developmental Dysplasia Of The Hip - An Engineering Study Of Closed Reduction Utilizing The Pavlik Harness For A Range Of Subtle To Severe Dislocations In Infants., Victor Huayamave

Electronic Theses and Dissertations

Developmental Dysplasia of the Hip (DDH) is an abnormal condition where hip joint dislocation, misalignment, or instability is present in infants. Rates of incidence of DDH in newborn infants have been reported to vary between 1 and 20 per 1000 births, making it the most common congenital malformation of the musculoskeletal system. DDH early detection and treatment is critical to avoid the use of surgical treatment in infants and to prevent future complications such as osteoarthritis in adult life. To this day several non-surgical treatments involving the use of harnesses and braces have been proposed to treat DDH in infants, …

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A New Approach To Digital Generation Of Spherical Void Phase Porous Media Microstructures, Nolan J. Dyck, Anthony G. Straatman Jan 2015

A New Approach To Digital Generation Of Spherical Void Phase Porous Media Microstructures, Nolan J. Dyck, Anthony G. Straatman

Mechanical and Materials Engineering Publications

No abstract provided.

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Analytical And Numerical Validation Of Nozzle Spray Measurement Data Obtained From A Newly Developed Production System, Iddrisu Seidu Jan 2015

Analytical And Numerical Validation Of Nozzle Spray Measurement Data Obtained From A Newly Developed Production System, Iddrisu Seidu

ETD Archive

A newly developed production test stand for measuring the spray angle of a pressure swirl atomizer was constructed and used to measure a product line of these pressure swirl atomizers -- the macrospray atomizer. This new test stand, utilizing constant temperature hot wire anemometers, captures the spray angle data based on the voltage drop the hot wire probes see as they traverse the spray cone of the atomizer and as fluid droplets impinge upon the wire. Datasets acquired from the experiments are compared and correlated with computational fluid dynamics (CFD) simulation data. In addition, angles obtained from another type of …

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Dynamic Model Of A Non-Linear Pneumatic Pressure Modulating Valve Using Bond Graphs, Christopher L. Brubaker Jan 2015

Dynamic Model Of A Non-Linear Pneumatic Pressure Modulating Valve Using Bond Graphs, Christopher L. Brubaker

ETD Archive

This research develops a mathematical model of the dynamic pressure response to a variable travel input of a pneumatic pressure modulating valve intended for use in a vehicle air brake system. Generically, the valve is a multi-domain system consisting of a mechanical portion and a pneumatic portion. Included in the mechanical portion of the model are compliance of the springs, inertia of the components, and resistance of the sliding components. The pneumatic portion of the model includes capacitance due to the compressibility of the gas, flow resistance through connected plumbing, and flow resistance through the valve control orifices. The development …

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Optimal Design And Control Of A Lower-Limb Prosthesis With Energy Regeneration, Holly E. Warner Jan 2015

Optimal Design And Control Of A Lower-Limb Prosthesis With Energy Regeneration, Holly E. Warner

ETD Archive

The majority of amputations are of the lower limbs. This correlates to a particular need for lower-limb prostheses. Many common prosthesis designs are passive in nature, making them inefficient compared to the natural body. Recently as technology has progressed, interest in powered prostheses has expanded, seeking improved kinematics and kinetics for amputees. The current state of this art is described in this thesis, noting that most powered prosthesis designs do not consider integrating the knee and the ankle or energy exchange between these two joints. An energy regenerative, motorized prosthesis is proposed here to address this gap. After preliminary data …

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Chloride Incorporation Process In Ch3Nh3Pbi3-XClX Perovskites Via Nanoscale Bandgap Maps, Jungseok Chae, Qingfeng Dong, Jinsong Huang, Andrea Centrone Jan 2015

Chloride Incorporation Process In Ch3Nh3Pbi3-XClX Perovskites Via Nanoscale Bandgap Maps, Jungseok Chae, Qingfeng Dong, Jinsong Huang, Andrea Centrone

Department of Mechanical and Materials Engineering: Faculty Publications

CH3NH3PbI3-xClx perovskites enable fabrication of highly efficient solar cells. Chloride ions benefit the morphology, carrier diffusion length and stability of perovskite films; however, whether those benefits stem from the presence of Cl− in the precursor solution or from their incorporation in annealed films is debated. In this work, the photothermal induced resonance (PTIR), an in situ technique with nanoscale resolution, is leveraged to measure the bandgap of CH3NH3PbI3-xClx films obtained by a multicycle coating process that produces high efficiency (≈16 %) solar cells. Because chloride …

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Role Of Interphase In The Mechanical Behavior Of Silica/Epoxy Resin Nanocomposites, Yi Hua, Linxia Gu, Sundaralingam Premaraj, Xiaodong Zhang Jan 2015

Role Of Interphase In The Mechanical Behavior Of Silica/Epoxy Resin Nanocomposites, Yi Hua, Linxia Gu, Sundaralingam Premaraj, Xiaodong Zhang

Department of Mechanical and Materials Engineering: Faculty Publications

A nanoscale representative volume element has been developed to investigate the effect of interphase geometry and property on the mechanical behavior of silica/epoxy resin nanocomposites. The role of interphase–matrix bonding was also examined. Results suggested that interphase modulus and interfacial bonding conditions had significant influence on the effective stiffness of nanocomposites, while its sensitivities with respect to both the thickness and the gradient property of the interphase was minimal. The stiffer interphase demonstrated a higher load-sharing capacity, which also increased the stress distribution uniformity within the resin nanocomposites. Under the condition of imperfect interfacial bonding, the effective stiffness of nanocomposites …

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Voigt, Reuss, Hill, And Self-Consistent Techniques For Modeling Ultrasonic Scattering, Christopher M. Kube, Joseph A. Turner Jan 2015

Voigt, Reuss, Hill, And Self-Consistent Techniques For Modeling Ultrasonic Scattering, Christopher M. Kube, Joseph A. Turner

Department of Mechanical and Materials Engineering: Faculty Publications

An elastic wave propagating in a metal loses a portion of its energy from scattering caused by acoustic impedance differences existing at the boundaries of anisotropic grains. Theoretical scattering models capture this phenomena by assuming the incoming wave is described by an average elastic moduli tensorC0ijkl (x) that is perturbed by a grain with elasticityCijkl (x ') where the scattering event occurs when x = x’. Previous models have assumed that C0ijkl (x) is the Voigt average of the singlecrystal elastic moduli tensor. However, this assumption …

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Acoustic Attenuation Coefficients For Polycrystalline Materials Containing Crystallites Of Any Symmetry Class, Christopher M. Kube, Joesph A. Turner Jan 2015

Acoustic Attenuation Coefficients For Polycrystalline Materials Containing Crystallites Of Any Symmetry Class, Christopher M. Kube, Joesph A. Turner

Department of Mechanical and Materials Engineering: Faculty Publications

This letter provides a theoretical extension to the elastic properties of polycrystals in order to describe elastic wave scattering from grain boundaries. The extension allows the longitudinal and shear attenuation coefficients for scattering to be derived and is valid for polycrystals containing crystallites of any symmetry class. Attenuation curves are given for polycrystalline SiO2, ZrO2, and SnF2, which contain monoclinic crystallites. This work will allow ultrasonic techniques to be applied to new classes of materials containing nontrivial microstructures.

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Helmholtz Equation Least Squares Based Near-Field Acoustic Holography With Laser, Wu Zhu Jan 2015

Helmholtz Equation Least Squares Based Near-Field Acoustic Holography With Laser, Wu Zhu

Wayne State University Dissertations

This dissertation presents the HELS based NAH with laser and use normal surface velocity as input in near-field acoustic holography. The conventional HELS based NAH uses acoustic pressure as input to reconstruct sound field quantities, while this modified HELS based NAH with laser utilizes the normal surface velocities measured by LDV to reconstruct the acoustic quantities at interested positions. Theoretical principles of the HELS based NAH with laser have been fully developed and the method has been verified in theoretical perspective. Two theoretical examples verify that HELS based NAH with laser can obtain exactly the same results as analytic solution. …

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Multifunctional Nanomaterials For Biomedical Engineering: Unique Properties, Fabrications, And Diverse Applications, Jen-Jie Chieh, Sharmila M. Mukhopadhyay, Yali Cui Jan 2015

Multifunctional Nanomaterials For Biomedical Engineering: Unique Properties, Fabrications, And Diverse Applications, Jen-Jie Chieh, Sharmila M. Mukhopadhyay, Yali Cui

Mechanical and Materials Engineering Faculty Publications

Nanomaterials possess many unique properties useful for biomedical applications ranging from preoperative and intraoperative imaging to coatings, assays, and cell scaffolds. Their popularity and production value are full of competitiveness. Their related methodologies and instruments are also created or emphasized as the mainstream. Since multifunctional nanomaterials attract interests and attention of researchers, engineers, and businessmen in biomedical engineering, this journal is set up to publish a special issue devoted to this topic. The result is a collection of five original research articles, whose authors belong to academic or research institutions of five different countries from Asia, Europe, and America. Papers …

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Interface Property Of Collagen And Hydroxyapatite In Bone And Developing Bioinspired Materials, Clint Paul Jan 2015

Interface Property Of Collagen And Hydroxyapatite In Bone And Developing Bioinspired Materials, Clint Paul

Inquiry: The University of Arkansas Undergraduate Research Journal

Bone at the nanoscale consists of type I collagen and hydroxyapatite (HAP). Type I collagen and HAP [Ca10(PO4)6(OH)2] are responsible for most of the structural integrity of bone. Collagen fibrils contain HAP platelets of varying size dispersed between the collagen. We investigate heterotrimeric collagen interaction with HAP using Steering Molecular Dynamics to obtain the force-displacement relation as the collagen is undergoing shearing and peeling on the surface of HAP. Results indicate that the collagen requires 40% less force to separate form the HAP surface under peeling, when compared to shear loading conditions. In both shearing and peeling, the number of …

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Test 2126a: New Holland T8.435, Nebraska Tractor Test Lab Jan 2015

Test 2126a: New Holland T8.435, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

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Operating Principles, Common Questions, And Performance Data For An Atmospheric Driven Atmos Clock, David Moline, John Wagner Jan 2015

Operating Principles, Common Questions, And Performance Data For An Atmospheric Driven Atmos Clock, David Moline, John Wagner

Publications

The elegance of the Atmos clock and the curiosity of mankind in self-operational mechanical systems have propelled this time device into our collective desire for more knowledge. The search for a self-winding time piece, based on normal atmospheric fluctuations, was pursued for centuries by horologists with the well-known clock proposed by J. L. Reutter and commercialized by Jaeger LeCoultre. This clock has generated numerous discussions throughout the years as noted in past Bulletin articles and other correspondences within the time keeping community. In this paper, the operating principles of the Atmos clock will be reviewed using fundamental science and engineering …

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Three-Dimensional Indeterminate Impacts In Legged Robotic Locomotion, Abhishek Chatterjee Jan 2015

Three-Dimensional Indeterminate Impacts In Legged Robotic Locomotion, Abhishek Chatterjee

Mechanical and Aerospace Engineering Theses - Archive

Legged robotic systems undergo a large number of impacts during walking or running tasks. These impacts occur over the surface of contact between the feet and the ground. If a rigid body assumption is held, these impacts can be analyzed by selecting a certain number of points on the impacting bodies. A minimum of three points are required for analyzing a surface contact on a plane. However, using a minimum number of points for analyzing surface impact would require an additional analysis for appropriately selecting these points. On the other hand, if a large number of evenly distributed impact points …

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Biomechanical Analysis Of The Cornea To Improve Post Surgical Outcomes Through Finite Element Analysis, Salman Nasir Khan Jan 2015

Biomechanical Analysis Of The Cornea To Improve Post Surgical Outcomes Through Finite Element Analysis, Salman Nasir Khan

Mechanical and Aerospace Engineering Dissertations - Archive

Vision deterioration is a major healthcare concern. It is estimated that one in three persons develops some form of vision reducing eye disease by the age of 65 and these numbers are expected to increase. Deterioration in visual acuity is due to ocular diseases that change the shape or clarity of the cornea. Health/shape of the cornea is extremely important as it determines the refractive power of the eye.This work studies ocular surgeries from a mechanical/structural engineering perspective. It begins by discussing laser in-situ keratomileusis (LASIK) surgery and explains the role of lasers in modifying the corneal shape to improve …

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Design Of Cooling And Ventilation Of Telecommunication Shelter At High Altitude, Palak Patel Jan 2015

Design Of Cooling And Ventilation Of Telecommunication Shelter At High Altitude, Palak Patel

Mechanical and Aerospace Engineering Theses - Archive

Telecommunication shelters house information technology (IT), networking, power, and cooling equipment such as racks, power cabinets, batteries, fans, etc. For reliable operation of the IT and networking equipment, shelters need to satisfy or exceed minimum environmental guidelines for all equipment they contain. These guidelines typically contain specified operational temperature, maximum gaseous and particular contaminant levels. In this work, cooling and ventilation needs of a telecommunication shelter at an altitude of 9,678 feet are studied by modeling the system and simulating various operational and weather scenarios using FloVENT 10.1, a computational fluid dynamics (CFD) tool. The shelter contains two compartments: the …

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Experimental And Computatonal Analysis Of The Effect Of Pcb Layer Copper Thickness And Prepreg Layer Stiffness On Solder Joint Reliability, Sanjay Mahesan Revathi Jan 2015

Experimental And Computatonal Analysis Of The Effect Of Pcb Layer Copper Thickness And Prepreg Layer Stiffness On Solder Joint Reliability, Sanjay Mahesan Revathi

Mechanical and Aerospace Engineering Theses - Archive

The emphasis of this study is to find out how the solder joints of the BGA package are affected with change in the stack up PCB layer copper thickness and the prepeg layer stiffness. In general the effect of the PCB layer thickness is to increase the stress and strain range and to decrease the thermal fatigue life. Basically a PCB consists of different layers with different material properties (Eg: Cu, FR4 etc.).In this paper we deal with the PCB with 1-6-1 configuration (6 core layers and 1 prepeg layer on the top and bottom). A Prepeg is a fiber …

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Study Of Hotspot Cooling For Integrated Circuits Using Electrowetting On Dielectric Digital Microfluidic System, Govindraj Shreyas Bindiganavale Jan 2015

Study Of Hotspot Cooling For Integrated Circuits Using Electrowetting On Dielectric Digital Microfluidic System, Govindraj Shreyas Bindiganavale

Mechanical and Aerospace Engineering Dissertations - Archive

Thermal management in electronics is an ever-growing challenge which needs constant innovations to regulate hotspots in integrated circuits for safe operation within its Thermal Design Power (TDP) envelope. As the number of transistors increase due to advancements in photolithography to enable die shrink, portable electronics are on the rise and so is the demand for microscale cooling systems because conventional cooling components like heat sinks, heat pipes and fans are not capable of meeting design requirements for cooling solutions. In addition to the benefits enjoyed by microscale cooling systems like compact and lightweight design along with simple operation, electrowetting on …

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Accurate Three-Dimensional Characterization Of The Nonlinear Material Constitutive Properties For Laminated Composite Materials, Julia Elaine Cline Jan 2015

Accurate Three-Dimensional Characterization Of The Nonlinear Material Constitutive Properties For Laminated Composite Materials, Julia Elaine Cline

Mechanical and Aerospace Engineering Dissertations - Archive

Accurate and efficient full three-dimensional characterization of mechanical properties of composite materials, including stress-strain curves and strength characteristics, is essential for understanding complex deformation and failure mechanisms of composites and optimizing material qualification efforts. Non-contact full-field deformation measurement techniques such as digital image correlation (DIC) allowing for assessment of all surface strain components on the entire specimen surface, enable simpler experimental setups and material specimen designs for more efficient and accurate material characterization. This work presents a new method enabling simultaneous assessment of the shear stress-strain curves in all three principal material planes. The method uses a small rectangular plate …

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Structural Integrity Of Tsvs In 3d Package Under Thermal Loading, Parinda Patel Jan 2015

Structural Integrity Of Tsvs In 3d Package Under Thermal Loading, Parinda Patel

Mechanical and Aerospace Engineering Theses - Archive

In this advanced technological era, all electronic equipments tend to be light in weight, and have high performance with low power consumption and low prices. Gain in both performance and cost via Moore's law is starting becoming difficult post 28nm technology node. Three dimensional chips staking with TSV technology has gained momentum to meet such requirements of significant miniaturization and power reduction which result in increased performance. Vertically interconnected TSVs provide the shorter effective electrical interconnect path, resulting in reduced signal latency between strata and greater signal bandwidth. Moreover, TSVs offer high density integration, increased number of input/output terminals and …

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Considerations For Generating Accurate Linear Transfer Functions For Laminar Flow Transmission Line Dynamics, Sina Jasteh Jan 2015

Considerations For Generating Accurate Linear Transfer Functions For Laminar Flow Transmission Line Dynamics, Sina Jasteh

Mechanical and Aerospace Engineering Theses - Archive

Modeling fluid lines for applications such as hydraulic fracturing has been studied for many years, and we know that the inverse frequency method presents very accurate solutions for systems with lines in almost all laminar flow cases. However, utilizing this method is not easy for all users, and requires experience and understanding of the method. In this study a simplified method is introduced for accurately modeling the transients in lines which requires minimum experience in utilizing inverse frequency methods; the accuracy and limits of this simplified method are studied. Also, alternative approaches are presented which improved the accuracy of the …

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