School of Mechanical Engineering Theses and Dissertations
Original work in partial fulfillment of a graduate degree in the School of Mechanical Engineering.
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Recent Submissions
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Comparison of radiation damage effects in organic and silicon photodetectors
(Georgia Institute of Technology, 2019-04-30)Field deployment of radiation detectors for use in nuclear material verification and in portal monitors requires rugged systems capable of withstanding high fluences of mixed-field radiation. As the use of solid-state ... -
Design, control, and human subject evaluation of powered hip exoskeletons
(Georgia Institute of Technology, 2019-04-30)Powered lower-limb exoskeletons have potentials to revolutionize many fields such as industrial, military, and clinical industries. Most lower-limb exoskeletons are complex multi-joint devices that are often limited by ... -
Developing Aerosol Jet Printable Regenerated Silk Fibroin Solutions
(Georgia Institute of Technology, 2019-04-30)Regenerated silk fibroin (RSF) solutions have gained a lot of attention due to its strong mechanical properties, biocompatibility and biodegradability. To exploit these unique properties, for applications such as drug ... -
Numerical Modeling of a Solid Oxide Fuel Cell for use in Real-Time Simulation and Cyber-Physical Systems
(Georgia Institute of Technology, 2019-04-26)Cyber-physical systems provide a mechanism with which to investigate the physical phenomena and behavior of traditionally cost-prohibitive or otherwise fragile equipment. For the National Energy Technology Laboratory (NETL), ... -
CHARACTERIZATION OF ENCAPSULANT AND EDGE SEAL MATERIALS FOR FLEXIBLE SOLAR CELL PACKAGING
(Georgia Institute of Technology, 2019-04-25)Flexible photovoltaic devices have the potential to be an attractive alternative to conventional PV technologies if they can be made environmentally stable and reliable. Therefore there is a need to develop encapsulation ... -
Analysis of Surrogate Post-detonation Urban Debris (SPUD) Gamma Rays and Self-Attenuation
(Georgia Institute of Technology, 2019-04-29)Despite the importance of post-detonation nuclear forensics, there is a dearth of Standard Reference Materials (SRMs) suitable for such measurements that are traceable back to a national standard. Accordingly, the nuclear ... -
Examining the effect of design for additive manufacturing rule presentation on part redesign quality
(Georgia Institute of Technology, 2019-04-25)The main goal of this thesis is to the study the way design for additive manufacturing (DfAM) rule presentation affects a designer’s ability to utilize those rules. To that end a pair of studies were carried out. The first ... -
Rotation Calculation in Tokamak Plasma
(Georgia Institute of Technology, 2019-04-30)Rotation is important in tokamaks because of its effect on confinement and stability. This purpose of this thesis is to evaluate the effectiveness of neoclassical gyroviscous theory on determining the toroidal rotation ... -
A Voxelized Framework for Simulating Cutting Tool and Workpiece Interaction
(Georgia Institute of Technology, 2019-04-30)In this manuscript, a voxel based model for the interaction between cutting teeth of an arbitrary end mill geometry and a workpiece is developed that allows for the virtual machining of workpiece volumes with generated ... -
Visualization of nucleation of supercritical carbon dioxide flow through a nozzle
(Georgia Institute of Technology, 2019-04-25)Interest in fundamental properties of carbon dioxide near the critical point led to an investigation of supercritical CO2 flow through a converging-diverging nozzle. To study a phase change and flow behavior of supercritical ... -
Advanced Solutions for Thermal Management and Reliability of Gallium Nitride-Based High Electron Mobility Transistors on Diamond Substrates
(Georgia Institute of Technology, 2019-04-24)Recent advancements in material growth, processing technologies, device architecture, and reliability testing have propelled AlGaN/GaN HEMTs to the forefront of high-power radio frequency (RF) electronics applications ... -
Experimental Methods to Inform Thermal Interface Engineering in High Power GaN Devices
(Georgia Institute of Technology, 2019-03-28)Current limitations in high-power GaN technologies exist due to thermal resistances in the device structures which impact heat dissipation during operation. Often, the thermal boundary resistance (TBR) between the GaN and ... -
Optimization of Activation Foil Passive Neutron Detectors
(Georgia Institute of Technology, 2019-03-27)Passive neutron detectors, including activation foils, use neutron absorption reactions with known cross sections to determine a level of neutron radiation received over time. Activation foils are chosen for a specific ... -
Effects of initial conditions and Mach number on turbulent mixing transition of shock-driven variable-density flow
(Georgia Institute of Technology, 2019-03-25)This thesis presents results on the effects of initial conditions (single- and multi-mode) and incident shock wave Mach numbers (M) on several mixing characteristics in Richtmyer-Meshkov instability (RMI) evolution. These ... -
The Development and Application of Design and Optimization Methods for Energy Intensive Mechanical Systems for Challenging Environments as Applied to a Concentrated Solar Power Particle Lift System
(Georgia Institute of Technology, 2019-03-21)This dissertation investigated improved methods and tools for the design and optimization of energy intensive mechanical systems with specific application to high temperature particle transport for use in a particle heating ... -
Revisiting the Theory of Alloy Thermal Conductivity
(Georgia Institute of Technology, 2019-03-25)Current understanding of phonons is based on the phonon gas model (PGM). According to the PGM, the vibrational modes in a material are assumed to be plane-waves, hence they can be modeled as a gas of particles that exchange ... -
Characterization of Plastic Deformation Mechanisms in Ultrafine Grained FCC Metals Using MEMS Based Nanomechanical Testing Methods
(Georgia Institute of Technology, 2019-03-14)A MEMS-based in-situ TEM nanomechanical testing technique was developed to characterize mechanisms of plastic deformation in ultrafine-grained FCC metals via transient mechanical tests. Advances were made to an existing ... -
Direct Servo Control of Positional Derivatives for 5-Axis CNC Machine Tools Using Densely-Sampled Toolpaths
(Georgia Institute of Technology, 2019-03-25)Ever-increasing quality and complexity requirements for machined parts have led to the development of computer-numerical control (CNC) machine tools with high numbers of servo axes capable of tightly coordinated motion. ... -
Burn Control Mechanisms in Tokamak Fusion Reactors
(Georgia Institute of Technology, 2019-01-11)The D-T fusion cross section has a significantly positive temperature dependence in the range of temperatures that ITER is expected to operate in. As a result, ITER must have active and preferably also passive control ... -
Two-Scale Command Shaping for Feedforward Control of Nonlinear Systems
(Georgia Institute of Technology, 2019-01-08)This research proposes a two-scale command shaping (TSCS) approach for tailoring control inputs to nonlinear, flexible systems aimed at reducing undesirable residual vibrations. These systems exhibit control complexities ...
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