Mechanical And Electrical Characterization Of Carbon Fiber/Bucky Paper/Zinc Oxide Hybrid Composites,
2017
Embry-Riddle Aeronautical University
Mechanical And Electrical Characterization Of Carbon Fiber/Bucky Paper/Zinc Oxide Hybrid Composites, Suma Ayyagari
Doctoral Dissertations and Master's Theses
The quest for multifunctional carbon fiber reinforced composites (CFRPs) expedited the use of several nano reinforcements such as zinc oxide nanorods (ZnO) and carbon nanotubes (CNTs). Zinc oxide is semi-conductor with good piezoelectric and pyroelectric properties. These properties could be transmitted to CFRPs when a nanophase of ZnO is embedded within CFRPs. In lieu of ZnO nanorods, Bucky paper comprising mat of multiwall-carbon nanotubes (MWCNTs) could be sandwiched in-between laminae to construct a functionally graded composite with elevated electrical and thermal conductivities. In this study, a low temperature ( 90_C) hydrothermal synthesis method was utilized to grow ZnO nanorods on …
Aviation Propulsive Lithium-Ion Battery Packs State-Of-Charge And State-Of-Health Estimations And Propulsive Battery System Weight Analysis,
2017
Embry-Riddle Aeronautical University
Aviation Propulsive Lithium-Ion Battery Packs State-Of-Charge And State-Of-Health Estimations And Propulsive Battery System Weight Analysis, Jingsi Lilly
Doctoral Dissertations and Master's Theses
Aviation propulsive battery pack research is in high demand with the development of electric and hybrid aircraft. Accurate inflight state-of-charge and state-of-health estimations of aviation battery packs still remain challenging. This thesis puts efforts on estimating the state-of-charge, state-of-health, and remaining energy of a lithium- ion propulsive battery pack with a recursive least squares based adaptive estimator. By reading the system measurements (discharging currents and terminal voltages) with persistent excitation, the proposed estimator can determine the present internal parameters of the battery cells and further interpolate them into state-of-charge, state-of-health, and the remaining energy information. The validation results indicate that …
Aerodynamic And Performance Analysis Of A Morphing Helicopter Rotor System,
2017
Embry-Riddle Aeronautical University
Aerodynamic And Performance Analysis Of A Morphing Helicopter Rotor System, Vinay Gopal Krishnan
Doctoral Dissertations and Master's Theses
The purpose of this study was to investigate the effect of rotor morphing, specifically variable rotor speed and variable blade twist, on various parameters such as the distribution of angle of attack, lift, power, thrust and/or other metrics describing the performance of a helicopter rotor. A MATLAB based blade element theory model was developed and executed for different flight conditions. The model was validated against the flight test data of a UH-60. Effects on power, lift to drag ratio and rotor drag from variations in blade twist, rotor speed, rotor radius and blade chord was analyzed. Morphing cases were applied …
Design Of Flight Control Laws For A Novel Stratospheric Dual-Aircraft Platform,
2017
Embry-Riddle Aeronautical University
Design Of Flight Control Laws For A Novel Stratospheric Dual-Aircraft Platform, Cindy Nshuti
Doctoral Dissertations and Master's Theses
Dual-aircraft platform (DAP) is a novel concept that features two glider-like unmanned aerial systems (UAS) tethered via a thin adjustable cable allowing them to sail back-and-forth, without propulsion, using vertical wind shear. DAP offers the potential of a low-cost atmospheric satellite. This thesis presents the results of an initiative to demonstrate this novel flight concept through modeling, simulation, and flight testing at Embry-Riddle Aeronautical University (ERAU). A realistic simulation environment, described herein, was developed to support the development and testing of flight control systems. This environment includes nonlinear aerodynamic models for the aircraft, a multi-element cable dynamics model, propeller-motor thrust …
A Study On The Control, Dynamics, And Hardware Of Micro Aerial Biomimetic Flapping Wing Vehicles,
2017
Embry-Riddle Aeronautical University
A Study On The Control, Dynamics, And Hardware Of Micro Aerial Biomimetic Flapping Wing Vehicles, Siara Hunt
Doctoral Dissertations and Master's Theses
Biological flight encapsulates 400 million years of evolutionary ingenuity and thus is the most efficient way to fly. If an engineering pursuit is not adhering to biomimetic inspiration, then it is probably not the most efficient design. An aircraft that is inspired by bird or other biological modes of flight is called an ornithopter and is the original design of the first airplanes. Flapping wings hold much engineering promise with the potential to produce lift and thrust simultaneously. In this research, modeling and simulation of a flapping wing vehicle is generated. The purpose of this research is to develop a …
Experimental Study Of Global Luminescent Oil-Film (Glof) Skin-Friction Meter On Delta Wings,
2017
Western Michigan University
Experimental Study Of Global Luminescent Oil-Film (Glof) Skin-Friction Meter On Delta Wings, Patrick Nicholas Wewengkang
Masters Theses
This thesis describes how the Global Luminescent Oil-Film (GLOF) Skin-Friction Meter can be applied experimentally to extract skin-friction from a set of images. In this study, the effect of oil viscosity, experimental sample size, and step size were considered to see how they would affect the extracted skin-friction using the GLOF method. These results were then compared to published literature on skin-friction diagnostics of delta wings, based on observations of critical characteristics such as reattachment and separation lines. Delta wings of 50°, 55°, 60°, 65°, and 70° sweep angles were built and placed in the Small Wind Tunnel (SWT) at …
2017 Summer-Fall Graduate Recognition Program,
2017
The University of Alabama in Huntsville
2017 Summer-Fall Graduate Recognition Program, Propulsion Research Center, Robert Frederick
PRC Graduate Recognition
This program includes the graduate recognition program for summer and fall 2017. Includes photographs, upcoming events, recent publications, and student profiles.
Sensitivity Of Facial Organs Of Pythons As Deduced By Radiation Heat Transfer Analysis Under Varying Environmental Conditions,
2017
Florida Institute of Technology
Sensitivity Of Facial Organs Of Pythons As Deduced By Radiation Heat Transfer Analysis Under Varying Environmental Conditions, Rama Wairagkar
Theses and Dissertations
Predicting the behavior of snakes has been an interest to several scientists for the last few decades. Even though considerable amount of research has been carried out pertaining to snakes, there remains a degree of curiosity regarding their striking ability, live prey detection at locations where visual clues are unobtainable, thermosensation and the phenomena that drives these conducts. Researches carried out so far have moderately disregarded the perception of sensitivity of facial pits of snakes and its characteristics under contrasting temperature domains. This thesis attempts to undertake a computational analysis of the sensitivity of facial pits of Burmese pythons under …
System Study Of An On-Orbit Additive Manufacturing Cubesat,
2017
Florida Institute of Technology
System Study Of An On-Orbit Additive Manufacturing Cubesat, Juliette Isabelle Bido
Theses and Dissertations
The AddCube mission aims to demonstrate additive manufacturing technology in microgravity on a CubeSat platform by 3D-printing a 1-meter long rectangular beam on orbit. To accomplish this task, Made In Space Inc. (MIS) will provide the Extended Structure Additive Manufacturing Machine – CubeSat (ESAMM-C) payload. The high power required by the ESAMM-C payload creates a complex thermal problem within the spacecraft due to tight volume constraints associated with CubeSats. To cope with this problem, an in depth worst-case thermal analysis of the integrated spacecraft is conducted and an appropriate thermal management system for the mission is designed. Temperature regulation is …
Flight Testing Angle-Of-Attack Warning Combinations On Part 23 Aircraft,
2017
Florida Institute of Technology
Flight Testing Angle-Of-Attack Warning Combinations On Part 23 Aircraft, Jennifer Grey Geehan
Theses and Dissertations
The high number of accidents involving General Aviation (GA) aircraft leads to a need for improved methods to warn pilots of high angles of attack (AOA) and impending stall. Such methods must be certified by the Federal Aviation Administration (FAA) under Federal Aviation Regulations Part 23 regarding their effectiveness in preventing departures from controlled flight. Therefore, methods of compliance must be developed to certify Part 23 aircraft equipped with AOA warning or limiting systems. The research objectives were to (a) determine methods for the evaluation of AOA warning and limiting systems and to (b) evaluate the effectiveness of baseline combinations …
Implementation And Verification Of A Synthetic Eddy Method (Sem) In The Eagle3d Compressible Flow Solver,
2017
Embry-Riddle Aeronautical University
Implementation And Verification Of A Synthetic Eddy Method (Sem) In The Eagle3d Compressible Flow Solver, Patrick Kopper
Doctoral Dissertations and Master's Theses
The objective of this thesis is to implement and evaluate a Synthetic Eddy Method (SEM) into the Eagle3D compressible flow solver. Both the ability of Eagle3D to resolve unsteady turbulent ow field and capability of the SEM to reproduce given Reynolds stress profiles to start realistic turbulent behavior are verified using common academic cases. Eagle3D is a Computational Fluid Dynamics (CFD) solver using a novel combination of a Bounded Central Differencing (BCD) scheme with Weighted Essentially Non-Oscillatory (WENO) approximation to reduce numerical dissipation. SEM is a modern synthetic turbulence method able to reproduce an arbitrary Reynolds stresses specification on discretionary …
Development Of A Remotely-Piloted Vehicle Platform To Support Implementation, Verification, And Validation Of Pilot Control Systems,
2017
Embry-Riddle Aeronautical University
Development Of A Remotely-Piloted Vehicle Platform To Support Implementation, Verification, And Validation Of Pilot Control Systems, Sean O’Toole
Doctoral Dissertations and Master's Theses
This thesis presents the development of a research test bed and the use of a set of metrics for evaluating handling qualities with pilot in the loop configuration. The main objective of this study is to provide software and hardware tools to support performance evaluation of control systems designed to compensate for Pilot Induced Oscillations (PIOs). A remotely-piloted vehicle presented in this thesis consists of an RC aircraft modified to be flown from a ground station cockpit. The unmanned aerial system has a high-speed on-board processing system capable of simulating different conditions during flight such as injecting actuator failures and …
Coorstek- Spine Discectomy,
2017
Utah State University
Coorstek- Spine Discectomy, Rhett Prestwich, Logan Bolingbroke, Ryan Thomsen, Aaron Blanchard, Kayla Park
Undergraduate Honors Capstone Projects
The objective is to design improved instrumentation for performing a spine discectomy. In particular, the instrument should remove the nucleus pulposus without damaging the annulus in order to prepare the spine disc for the insertion of an artificial spacer. As more nucleus pulposus is removed from the disc, the spine will fuse more quickly and completely after the artificial spacer is inserted. The current process involves removing the nucleus pulposus piece by piece with pituitary rongeurs. This process is slow and often incomplete.
Electron Yield Measurements Of High-Yield, Low-Conductivity Dielectric Materials,
2017
Utah State University
Electron Yield Measurements Of High-Yield, Low-Conductivity Dielectric Materials, Justin Christensen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Materials exposed to the space plasma environment acquire electric charge, which can have harmful effects if it leads to arcing or electrostatic breakdown of important spacecraft components. In fact, spacecraft charging is the leading environmentally induced cause of spacecraft anomalies. This study focuses on measuring electron yield, a property of materials that describes how many electrons are ejected from a material under energetic electron bombardment, which can vary depending on the energy of incident electrons. Intrinsic electron yield is defined as the average number of electrons emitted per incident electron from an electrically neutral material. The specific aim of this …
The Influence Of Varying Fiber Stacking Sequence On The Tensile, Impact, And Water Absorption Properties Of Unidirectional Flax/E-Glass Fiber Reinforced Epoxy Composite,
2017
Utah State University
The Influence Of Varying Fiber Stacking Sequence On The Tensile, Impact, And Water Absorption Properties Of Unidirectional Flax/E-Glass Fiber Reinforced Epoxy Composite, Mohammed F. Al-Edhari
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This thesis includes the study of the mechanical performance of two different types of fibers reinforced hybrid composites. Two kinds of fibers, natural fiber (flax) and synthetic fiber (E-glass), are used to reinforce epoxy resin. To evaluate the effective properties of the hybrid composites, a micromechanical analysis of the structure genome (SG) of a unidirectional fiber hybrid composites is performed using nite element analysis (FEA). Both fibers are assumed to be circular and packed in a hexagonal pattern. The effects of varying volume fractions and fiber locations, of the two fibers, on the elastic properties of the hybrid composites are …
Transient Analysis Of Fracture Initiation In A Coupled Thermoelastic Solid,
2017
University of Kentucky
Transient Analysis Of Fracture Initiation In A Coupled Thermoelastic Solid, Louis Milton Brock
Mechanical Engineering Faculty Publications
An isotropic, thermoelastic solid is initially at rest at uniform (absolute) temperature, and contains a semi-infinite, plane crack. Application of in-plane and normal point forces to each face of the crack causes transient 3D growth. The related problem of discontinuities in temperature and displacement that exist on regions that exhibit dynamic similarity is first considered. Asymptotic expressions, whose inverses are valid near the crack edges for short times, are obtained in integral transform space. These lead to equations of the Wiener–Hopf type for the fracture problem. Analytical solutions are obtained and, upon inversion, subjected to a dynamic energy release rate …
Experimental Measurement Of Residual Stress And Distortion In Additively Manufactured Stainless Steel Components With Various Dimensions,
2017
Missouri University of Science and Technology
Experimental Measurement Of Residual Stress And Distortion In Additively Manufactured Stainless Steel Components With Various Dimensions, M. Ghasri-Khouzani, H. Peng, R. Rogge, R. Attardo, P. Ostiguy, J. Neidig, R. Billo, D. Hoelzle, M. R. Shankar
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Disk-shaped 316L stainless steel parts with various diameters and heights were additively manufactured using a direct metal laser sintering (DMLS) technique. Neutron diffraction was used to profile the residual stresses in the samples before and after removal of the build plate and support structures. Moreover, distortion level of the parts before and after the removal was quantified using a coordinate measuring machine (CMM). Large tensile in-plane stresses (up to ≈ 400 MPa) were measured near the as-built disk top surfaces, where the stress magnitude decreased from the disk center to the edges. The stress gradient was steeper for the disks …
Progress Towards An Opposed Piston Two Stroke Gasoline Aviation Engine,
2017
Southern Illinois University Carbondale
Progress Towards An Opposed Piston Two Stroke Gasoline Aviation Engine, Donald R. Morris
ASA Multidisciplinary Research Symposium
Opposed Piston Engine Technology is not new, but its application to small two-stroke gasoline engines is unexplored. This presentation explores the potential advantages of such an engine as well as progress towards a workable design.
Uas (Unmanned Aircraft Systems): Challenges And Opportunities,
2017
Southern Illinois University Carbondale
Uas (Unmanned Aircraft Systems): Challenges And Opportunities, Andy Wang
ASA Multidisciplinary Research Symposium
Experts in UAS (drones) applications and R&D will discuss new business applications, business opportunities, and latest R&D results.
Fdm Machine Learning: An Investigation Into The Utility Of Neural Networks As A Predictive Analytic Tool For Go Around Decision Making,
2017
Southern Illinois University Carbondale
Fdm Machine Learning: An Investigation Into The Utility Of Neural Networks As A Predictive Analytic Tool For Go Around Decision Making, John Bro
ASA Multidisciplinary Research Symposium
FDM MACHINE LEARNING: An investigation into the utility of neural networks as a predictive analytic tool for go around decision making.
