Blds Articulated Mounting Feet,
2014
California Polytechnic State University - San Luis Obispo
Blds Articulated Mounting Feet, Mitchell D. Conn, Chris Mazzucco
Mechanical Engineering
This final report summarizes all of the efforts of the Senior Project aimed at creating Articulating Mounting Feet for the BLDS. The project focuses on improving the design of the mounting feet for the current Boundary Layer Data System at Cal Poly, San Luis Obispo. Dr. Russ Westphal, the project’s sponsor, wishes that our team focus primarily on a reliable and lightweight mount design for a curved wing, with only transverse curvature. Dr. Westphal is currently researching the boundary layer effects on airplane wings at Cal Poly, and the ability to mount to a multitude of surface contours would increase …
Lightweight Uav Launcher,
2014
California Polytechnic State University - San Luis Obispo
Lightweight Uav Launcher, Ben Miller, Christian Valoria, Corinne Warnock, Jake Coutlee
Mechanical Engineering
This report discusses the design, construction, and testing of a lightweight, portable UAV launcher. There is a current need for a small team of soldiers to launch a US Marine Tier II UAV in a remote location without transport. Research was conducted into existing UAV launcher designs and the pros and cons of each were recorded. This research served as a basis for concept generation during the initial design development stage. It was required that the design weigh less than 110 lbs, occupy a smaller volume than 48" x 24" 18" in its collapsed state, be portable by a single …
Rotating Test Apparatus,
2014
California Polytechnic State University - San Luis Obispo
Rotating Test Apparatus, Brian David Yale, David George Shelton
Mechanical Engineering
No abstract provided.
Local Vibrational Modes Competitions In Mn-Doped Zno Epitaxial Films With Tunable Ferromagnetism,
2014
Shandong University
Local Vibrational Modes Competitions In Mn-Doped Zno Epitaxial Films With Tunable Ferromagnetism, Qiang Cao, Maoxiang Fu, Guolei Liu, Huaijin Zhang, Shishen Yan, Yanxue Chen, Liangmo Mei, Jun Jiao
Mechanical and Materials Engineering Faculty Publications and Presentations
We reported spectroscopic investigations of high quality Mn-doped ZnO (ZnMnO) films grown by oxygen plasma-assisted molecular beam epitaxy. Raman scattering spectra revealed two local vibrational modes (LVMs) associated with Mn dopants at 523 and 712cm-1. The LVMs and magnetic properties of ZnMnO films can be synchronously modulated by post annealing processing or by introducing tiny Co. The relative intensity of two LVMs clearly shows competitions arising from uncompensated acceptor and donor defects competition for ferromagnetic and nonmagnetic films. The experimental results indicated that LVM at 523 cm-1 is attributed to Mn—(Zinc-vacancy) complexes, while LVM at 712 cm …
Automatic Evaluation Of Multidisciplinary Derivatives Using A Graph-Based Problem Formulation In Openmdao,
2014
NASA Glenn Research Center
Automatic Evaluation Of Multidisciplinary Derivatives Using A Graph-Based Problem Formulation In Openmdao, Justin Gray, Tristan Hearn, Kenneth Moore, John Hwang, Joaquim Martins, Andrew Ning
Faculty Publications
The optimization of multidisciplinary systems with respect to large numbers of design variables is best pursued using a gradient-based optimization together with a method that efficiently evaluates coupled derivatives, such as the coupled adjoint method. However, implementing such a method in a problem with more than a few disciplines is time consuming and error prone. To address this issue, we develop an automated procedure for assembling and solving the coupled derivative equations that takes into account the disciplinary couplings using the interdisciplinary dependency graph of the problem. The coupled derivatives can be computed completely analytically, if analytic derivatives are available …
Wake Interaction And Power Production Of Variable Height Model Wind Farms,
2014
Technical University of Denmark
Wake Interaction And Power Production Of Variable Height Model Wind Farms, M. H. Vested, N. Hamilton, J. N. Sørensen, Raul Bayoan Cal
Mechanical and Materials Engineering Faculty Publications and Presentations
Understanding wake dynamics is an ongoing research topic in wind energy, since wakes have considerable effects on the power production when wind turbines are placed in a wind farm. Wind tunnel experiments have been conducted to study the wake to wake interaction in a model wind farm in tandem with measurements of the extracted power. The aim is to investigate how alternating mast height influences the interaction of the wakes and the power production. Via the use of stereo-particle image velocimetry, the flow field was obtained in the first and last rows of the wind turbine array as a basis …
Pbs Quantum Dot-Based Hetrojunction Solar Cells,
2014
United Arab Emirates University
Pbs Quantum Dot-Based Hetrojunction Solar Cells, Sawsan Khader Dagher
Dissertations
This study investigates the influence of nanoparticles (NPs) size on their optical properties, and the effect of combination of lead sulfide (PbS) quantum dots (QDs), with n-type and p-type NPs, on the photogenerated charge carriers transport across the heterojunction solar cell structure. PbS QDs, of a range of sizes, were synthesized using a co-precipitation process. In this study, p-type NPs, which are poly [3,4-ethylenedioxythiophene] –poly [styrenesulfonate] (PEDOT: PSS), copper oxide (CuO) and graphene oxide (GO); and n-type NPs which are zinc oxide (ZnO), titanium dioxide (TiO2), cadmium sulfide (CdS) and bismuth sulfide (Bi2S3), were synthesized and characterized by SEM and …
Dynamics Of 1d Granular Column,
2014
New Jersey Institute of Technology
Dynamics Of 1d Granular Column, Luo Zuo
Dissertations
This dissertation is focused on a discrete element study of the dynamics of a one- dimensional column of inelastic spheres that it subjected to taps by prescribing a half sine wave pulse to supporting floor. Contact interactions obey the Walton-Braun soft-sphere model in which the loading (unloading) path is governing by linear springs of stiffness K1, thereby producing col lisional energy loss through a constant restitution coefficient e. Over a ‘short time scale’, computations are done to examine the floor pulse wave as it propagates through the column contact network. Comparisons of the simulated findings are made with experimental measurements …
Gas-Solid Transport And Reaction Via Intervened Evaporating Sprays,
2014
New Jersey Institute of Technology
Gas-Solid Transport And Reaction Via Intervened Evaporating Sprays, Pengfei He
Dissertations
Fluid catalytic cracking (FCC) is a major process used for converting heavy oils to transportation fuels and light olefins. The gas-solid transport with reaction via intervened evaporating sprays in the FCC riser is specially important but complicated, with coupled mechanisms of chemical reaction and heat, momentum and mass transfer among multiple phases (liquid, solid and gas) in the restriction of wall boundary. Recent developments in FCC process models have progressed along two lines. One aims to develop composition-based kinetic models derived from molecular characterization of petroleum fractions while overlooking the hydrodynamic effect on local catalyst to oil ratio (CTO). The …
Probing The Roles Of Polymeric Separators In Lithium-Ion Battery Capacity Fade At Elevated Temperatures,
2014
University of South Carolina - Columbia
Probing The Roles Of Polymeric Separators In Lithium-Ion Battery Capacity Fade At Elevated Temperatures, Jianchao Chen, Yongda Yan, Tao Sun, Yue Qi, Xiaodong Li
Faculty Publications
The high temperature mechanical property of separators is very important for safety of lithium-ion batteries. However, the mechanical integrity of polymeric separators in lithium-ion batteries at elevated temperatures is still not well characterized. In this paper, the temperature dependent micro-scale morphology change of PP (polypropylene)-PE (polyethylene)-PP sandwiched separators (Celgard 2325) was studied by in-situ high temperature surface imaging using an atomic force microscope (AFM) coupled with power spectral density (PSD) analysis and digital image correlation (DIC) technique. Both PSD and DIC analysis results show that the PP phase significantly closes its pores by means of dilation of the nanofibrils surrounding …
Fate Of Sessile Droplet Chemical Agents In Environmental Substrates In The Presence Of Physiochemical Processes,
2014
Kettering University
Fate Of Sessile Droplet Chemical Agents In Environmental Substrates In The Presence Of Physiochemical Processes, Homayun K. Navaz, A. L. Dang, Theresa Atkinson, Ali Zand, A. Nowakowski, K. Kamensky
Mechanical Engineering Presentations And Conference Materials
A general-purpose multi-phase and multi-component computer model capable of solving the complex problems encountered in the agent substrate interaction is developed. The model solves the transient and time-accurate mass and momentum governing equations in a three dimensional space. The provisions for considering all the inter-phase activities (solidification, evaporation, condensation, etc.) are included in the model. The chemical reactions among all phases are allowed and the products of the existing chemical reactions in all three phases are possible. The impact of chemical reaction products on the transport properties in porous media such as porosity, capillary pressure, and permeability is considered. Numerous …
Aerodynamic Improvements For Auto-Carrying Railcars,
2014
Brigham Young University - Provo
Aerodynamic Improvements For Auto-Carrying Railcars, Robert Arthur Condie
Theses and Dissertations
The railroad industry is responsible for the mass transport of a vast numbers of goods throughout the United States. As needs and capabilities of the railroad industry have changed, the interest in reducing the resistance of locomotives and railcars has increased. This has become paramount as fuel prices have increased in recent years. Resistant forces can result from friction in mechanical components and aerodynamic drag of the moving train. As the average traveling speeds of trains have increased, aerodynamics are contributing a larger fraction of the overall resistance. For this reason, the aerodynamic profiles of trains have become a topic …
Flexible Residential Test Facility: Impact Of Infiltration And Ventilation On Measured Cooling Season Energy And Moisture Levels,
2014
Florida Solar Energy Center
Flexible Residential Test Facility: Impact Of Infiltration And Ventilation On Measured Cooling Season Energy And Moisture Levels, Florida Solar Energy Center, Danny Parker
FSEC Energy Research Center®
Air infiltration and ventilation in residential buildings is a very large part of the heating loads, but empirical data regarding the impact on space cooling has been lacking. Moreover, there has been little data on how building tightness might relate to building interior moisture levels in homes in a hot and humid climate. To address this need, BA-PIRC has conducted research to assess the moisture and cooling load impacts of airtightness and mechanical ventilation in two identical laboratory homes in the hot-humid climate over the cooling season.
Environmental Stimulation Chamber For Nanosatellite Functional Testing,
2014
Santa Clara University
Environmental Stimulation Chamber For Nanosatellite Functional Testing, Taylor Donato, Nicholas Page, Joshua Summers, Brandon Wood
Mechanical Engineering Senior Theses
The goal of this project is to develop a nanosatellite thermal testing chamber for the Robotic Systems Laboratory at Santa Clara University. The nanosatellite industry has thrived in recent years and continues to grow at the level of universities and small businesses. To meet this demand, the team designed and built a testing bed capable of achieving environmental conditions adequate for testing nanosatellite hardware as a low-cost and low-maintenance alternative to more expensive and robust systems. Furthermore, the design can be fully manufactured and assembled at the university or small business level with inexpensive, sustainable, and commercially available components. The …
Microstructure Design And Experimental Characterization Of Functional Elastic Metamaterials,
2014
University of Arkansas Little Rock
Microstructure Design And Experimental Characterization Of Functional Elastic Metamaterials, Rui Zhu
Theses and Dissertations
Elastic metamaterials are of growing interest due to their dramatically increased manipulation ability as well as their novel engineering applications. The purpose of this research is to develop and model elastic metamaterials with unusual effective properties and their applications in low frequency elastic wave attenuation and vibration suppression. The working principle of the elastic metamaterials is to use man-made microstructures, local resonators, on a scale much less than its working wavelength. Therefore it is possible to describe their response by using dispersive homogenized effective media. First, we developed a retrieval method to obtain effective material properties of the metamaterial and …
Fluid Flow-Induced Mesenchymal Stem Cell Migration: Role Of Fak And Rock Mechanosensors,
2014
University of Nebraska-Lincoln
Fluid Flow-Induced Mesenchymal Stem Cell Migration: Role Of Fak And Rock Mechanosensors, Brandon D. Riehl
Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research
The study of mesenchymal stem cell (MSC) migration under mechanical stimulation conditions with investigation of the underlying molecular mechanism could lead to a better understanding and outcomes in stem cell-based regenerative medicine. MSCs having multipotent regenerative capability exist in niches in the bone marrow, muscle, vasculature, and in other tissues throughout the body, and their migration through tissues and vasculature for the repair of damaged tissue is a key process of cell and tissue homeostasis, remodeling, and regeneration. While cell migration in response to cytokines and other chemo-attractants is relatively well understood, little is revealed in regard to the effect …
Reducing Vortex-Induced Vibration Of Drilling Risers With Marine Fairing,
2014
University of New Orleans
Reducing Vortex-Induced Vibration Of Drilling Risers With Marine Fairing, Aswin Janardhanan
LSU New Orleans Theses and Dissertations
Since the offshore drilling for oil and gas is venturing into ever greater water depths, drilling risers face problems of vortex-induced vibrations due to the currents. Vortexinduced vibrations are a major fluid load and fatigue component on the long, smooth, and slender bodies placed in a fluid flow and measures must be taken to suppress the shedding of the Karman vortex sheets from its edges. One of the ways to reduce the vibration is to use marine fairings which are attached to the drilling risers with the help of weather vanes. In this thesis, CFD analysis based on solving RANS …
Adding Vision To A Quadrotor: A Design-Build-Test Adventure,
2014
Western Kentucky University
Adding Vision To A Quadrotor: A Design-Build-Test Adventure, Darren Tinker
Mahurin Honors College Capstone Experience/Thesis Projects
Quadrotors are small and exceptionally agile vehicles with maneuverability that permits both indoor and outdoor flight. The vast majority of quadrotors are flown autonomously as drones or remotely by a human-operator. Applications of quadrotors range from commercial deliveries, to military and law reconnaissance as well as research tools for various fields. Our lab at Western Kentucky University built a quadrotor in 2013, and we have been exploring various modifications to refine its performance and various applications in which it could be productively employed. Recently, research has focused on the addition of a camera to add capabilities for first person view …
An Approach To Thermocouple Temperature Measurements That Reduces Uncertainties Associated With Radiative Corrections,
2014
Washington University in St. Louis
An Approach To Thermocouple Temperature Measurements That Reduces Uncertainties Associated With Radiative Corrections, Siddharth Krishnan
McKelvey School of Engineering Graduate Student Theses & Dissertations
Obtaining accurate temperature measurements in flame environments with thermocouples is extremely challenging due to the effects of radiative heat loss. These losses are difficult to quantify and often cannot be corrected for or minimized without sacrificing spatial resolution. In this work, a new experimental methodology is presented that has shown potential to minimize the temperature correction by both increasing and controlling the effects of convection. This is accomplished through high speed rotation of the thermocouple. The rotation yields a high and known convective velocity over the thermocouple. Heat transfer can then be modeled for the thermocouple, and a functional relationship …
Engineered Plasmonic Nanostructures For Nanomedicine,
2014
Washington University in St. Louis
Engineered Plasmonic Nanostructures For Nanomedicine, Christopher Matthew Portz
McKelvey School of Engineering Graduate Student Theses & Dissertations
No abstract provided.
