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Articles 2701 - 2730 of 11196
Full-Text Articles in Aerospace Engineering
The Chime Fast Radio Burst Population Does Not Track The Star Formation History Of The Universe, Rachel C. Zhang, Bing Zhang
The Chime Fast Radio Burst Population Does Not Track The Star Formation History Of The Universe, Rachel C. Zhang, Bing Zhang
Physics & Astronomy Faculty Research
The redshift distribution of fast radio bursts (FRBs) is not well constrained. The association of the Galactic FRB 200428 with the young magnetar SGR 1935+2154 raises the working hypothesis that FRB sources track the star formation history of the universe. The discovery of FRB 20200120E in association with a globular cluster in the nearby galaxy M81, however, casts doubts on such an assumption. We apply the Monte Carlo method developed in a previous work to test different FRB redshift distribution models against the recently released first CHIME FRB catalog in terms of their distributions in specific fluence, external dispersion measure …
Pro Tips For Cfis: The Secret Life Of Stalls, Nihad E. Daidzic
Pro Tips For Cfis: The Secret Life Of Stalls, Nihad E. Daidzic
Aviation Department Publications
FAA Safety webinar (GL1590721) held online at 7:00 CST on Wednesday, January 5, 2022.
Social Representations Of Space Travel, Asli D. A. Tasci, Alan Fyall, Xiaoxiao Fu
Social Representations Of Space Travel, Asli D. A. Tasci, Alan Fyall, Xiaoxiao Fu
Rosen Research Review
Space tourism regularly receives media coverage, but so far, there has been little research around public opinions towards space travel. Dr. Asli D.A. Tasci, Dr. Alan Fyall and Dr. Xiaoxiao Fu from UCF Rosen College of Hospitality Management used the Social Representations Theory to investigate public attitudes to space travel and uncover how and why these attitudes are formed. They discovered that commercial space organizations have a strong influence on public opinion, which can be further enhanced if they incorporate more scientific knowledge and evidence.
A Qualitative Single-Case Exploring The Impact Of A Mentor And Cohort On Students’ Academic And Career Decisions., Kevin Adkins, Samantha Bowyer, Jorge L. D. Albelo Ph.D.
A Qualitative Single-Case Exploring The Impact Of A Mentor And Cohort On Students’ Academic And Career Decisions., Kevin Adkins, Samantha Bowyer, Jorge L. D. Albelo Ph.D.
Publications
Exposure to research is known to play a positive role in undergraduate education. However, robust research responsibilities are oftentimes not formally incorporated into a student’s academic experience until master level studies. Further, a variety of intimidation factors often inhibit many undergraduate students from participating on a research team. In this case study, the research team evaluated a unique group of undergraduate researchers who matriculated to the same university after beginning to participate in research as concurrently enrolled students. Following matriculation, each student continued to participate in research throughout the entirety of their undergraduate studies. All of the study’s students were …
Carbon Fiber Recycling: Delamination System, Aaron Eastman
Carbon Fiber Recycling: Delamination System, Aaron Eastman
All Undergraduate Projects
The production of composite wings at Boeing causes carbon fiber waste and CWU Mechanical Engineering Technology students have been tasked in designing a carbon fiber recycling system. This project was brought forth and funded by the Joint Center for Aerospace Technology Innovation (JCATI). There are three subsystems that make up the carbon fiber recycling system, the delamination system, shredding system, and the oven. The purpose of this project was to increase the efficiency and effectiveness of the delamination system of the carbon fiber recycling system. The old system reached approximately 30-40 percent delamination with one pass through the system, and …
Jcati Carbon Fiber Shredder 2022, Parker Sudderth
Jcati Carbon Fiber Shredder 2022, Parker Sudderth
All Undergraduate Projects
This project is a potential solution to keep the carbon fiber waste from airplane manufacturing to a minimum, sponsored by the Joint Center for Aerospace Technology Innovation (JCATI). The design and assembly will be scalable for future industry application. The overall design of the whole carbon fiber recycler consists of a crusher, shredder, and oven. This report is on the caron fiber shredder module. The shredder is tasked with being able to shred the delaminated carbon fiber scrap that directly comes from the crusher. The operation must produce shreds in the proper size to be gathered and delivered to the …
Uas Obstacle Database For University Traffic Management System, Casey Calamaio
Uas Obstacle Database For University Traffic Management System, Casey Calamaio
Summer Community of Scholars (RCEU and HCR) Project Proposals
No abstract provided.
Design And Development Of Active Flow Effectors, Konstantinos Kanistras
Design And Development Of Active Flow Effectors, Konstantinos Kanistras
Summer Community of Scholars (RCEU and HCR) Project Proposals
No abstract provided.
Design And Development Of An Online Wind Tunnel, Konstantinos Kanistras
Design And Development Of An Online Wind Tunnel, Konstantinos Kanistras
Summer Community of Scholars (RCEU and HCR) Project Proposals
No abstract provided.
Jcati Carbon Fiber Recycler: Oven Enclosure, Margarita Romero
Jcati Carbon Fiber Recycler: Oven Enclosure, Margarita Romero
All Undergraduate Projects
Central Washington University partners with Boeing and is funded by the Joint Center of Aerospace Technology Innovation (JCATI) to develop a mechanism that takes carbon fiber wing trimmings from Boeing that are resin coated and recycles carbon fiber. This is done by crushing the wing trimmings and then putting it into a 500°C oven to melt off the resin. This project focuses on the enclosure for the oven and making sure precautions are met such as having the outside surface be less than 45c through heat transfer analysis, argon fills enclosure in 13 minutes through fluid dynamics analysis, and 99% …
Analysis Of Nozzle Expansion Characteristics In Supersonic Retro-Propulsion, Gonzalo Montoya
Analysis Of Nozzle Expansion Characteristics In Supersonic Retro-Propulsion, Gonzalo Montoya
Honors Undergraduate Theses
Supersonic retro-propulsion (SRP) is defined as rocket propulsion used to decelerate aerospace vehicles at supersonic speed. SRP is often used as a method of high-speed deceleration on space vehicles. The main method of propulsion used in the application of SRP is rocket propulsion. Rocket engine thrust and performance changes with altitude and expansion ratio. Changing altitudes across the trajectory of a rocket affect how the exhaust plume shock waves expand. Being able to identify how different expansion ratios affect the exhaust plume flow fields would provide useful data on how SRP performance can be predicted. This research projects aims at …
Thermoforming Of Thin-Ply Composite Structures Via In-Situ Heating, Bojan Bijelic
Thermoforming Of Thin-Ply Composite Structures Via In-Situ Heating, Bojan Bijelic
Honors Undergraduate Theses
This thesis investigates thermoforming of thin-ply thermoplastic composites via in-situ heating for in-space manufacturing applications. The proposed composite concept is based on combining conductive carbon nanotube (CNT) films and high-temperature thermoplastic matrix. The CNT film is made of randomly aligned carbon nanotubes, which possesses outstanding electrical, thermal, and mechanical properties. When combined with polymer matrix, it becomes a multifunctional composite structure. The thermoplastic chosen is polyether ether ketone (PEEK), which is a semicrystalline high-performance thermoplastic that has exceptional physical and mechanical properties at high temperatures. The composite structure studied is consists of a layer of CNT film sandwiched between two …
Flame-Generated Turbulence For Flame Acceleration And Detonation Transition, Rachel Hytovick
Flame-Generated Turbulence For Flame Acceleration And Detonation Transition, Rachel Hytovick
Electronic Theses and Dissertations, 2020-2023
Detonations are a supersonic mode of combustion witnessed in a variety of applications, from next-generation propulsion devices to catastrophic explosions and the formation of supernovas. Detonations are typically initiated through the deflagration to detonation transition (DDT), a detailed process where a subsonic flame undergoes rapid acceleration increasing compressibility until a hotspot forms on the flame front inciting a detonation wave to form. Due to the complex nature of the phenomena, DDT is commonly investigated in three stages – (i) preconditioning, (ii) detonation onset, and (iii) wave propagation and stability. The research presented explores each of these stages individually, with a …
Design And Analysis Of A Foldable Propeller Blade, Annan Mashin
Design And Analysis Of A Foldable Propeller Blade, Annan Mashin
Electronic Theses and Dissertations, 2020-2023
Deployable structures have made an immense impact in the engineering world. The concept of the deployable structure has been able to reduce costs and sizing limits across a variety of use cases. However, sizing and cost reduction are not the only reasons that deployable structures are prominent. There are unique propeller blades that have entered into the world of deployable structures, where the ability to be stowed away and deployed to a much larger diameter can increase launch flexibility, and the engine efficiencies of aircraft. Although, most of the deployable propeller blades that have been designed in studies have the …
Extreme-Pressure Ignition Studies Of Methane And Natural Gas With Co2 With Applications In Rockets And Gas Turbines, Cory Kinney
Extreme-Pressure Ignition Studies Of Methane And Natural Gas With Co2 With Applications In Rockets And Gas Turbines, Cory Kinney
Electronic Theses and Dissertations, 2020-2023
Although concerns about carbon dioxide (CO2) emissions and their impact on climate change has led to an increase in renewable energy electricity generation, natural gas power plants remain the dominant source of electricity generation in the United States. Until the capacity of renewable energy sources can meet growing electricity demand, natural gas power generation will likely remain an important source of electricity generation. Supercritical CO2 (sCO2) power generation cycles offer an alternative to traditional gas turbines by reusing and sequestering CO2 from the combustion process to prevent its release into the atmosphere. This study seeks to understand natural gas ignition …
Thermal Testing And Simulation Of Lunar And Martian Isru-Based Materials, Andres Campbell
Thermal Testing And Simulation Of Lunar And Martian Isru-Based Materials, Andres Campbell
All Undergraduate Theses and Capstone Projects
Upon the eventual return of humans to the lunar surface, leveraging local resources to construct landing pads and other infrastructure is an essential component to minimize cost and risk. The inability to accurately model landing and launch scenarios to predict damage to lunar structures poses risks to astronaut and equipment safety. The following experiment is an investigation of using simulation software and temperature sensors to model lunar and Martian regolith simulant-based concrete exposed to thermal loads. The basis of this experiment is built upon standards defined by the American Society for Testing and Materials, the fundamental axioms of structural health …
A Monolithic Solid-State Interferometer For Real-Time Multi-Environment Measurements, Aaron J. Pung
A Monolithic Solid-State Interferometer For Real-Time Multi-Environment Measurements, Aaron J. Pung
Space Dynamics Laboratory Publications
The high degree of precision offered by optical interferometry makes it an ideal tool in many applications, including vibration detection, wind tunnel aerodynamics, surface topology measurements, and environmental sensing. In the latter case, real-time measurement of real-world environments is crucial to ensuring the health and safety of individuals operating within domestic and industrial domains. Currently, these measurements are made possible with portable fiber-based interferometer systems – systems that are also limited by high cost, fragility, coupling loss, and low power. This work presents a lightweight free-space interferometer that is versatile, modular, and compact. The interferometer is monolithic, geometrically simple, easy …
A Two-Layer Constellation Scheduling Approach For Imaging And Communication, Skylar Cox, Justin Whitaker, John Humble, Greg Droge
A Two-Layer Constellation Scheduling Approach For Imaging And Communication, Skylar Cox, Justin Whitaker, John Humble, Greg Droge
Space Dynamics Laboratory Publications
Spacecraft constellations continue to grow in numbers, capability, and sophistication, requiring in creased levels of automation to properly cooperate in achieving their objectives. This paper develops a constellation scheduling capability for collecting images of points of interest (POI) and communicating the imagery data through the constellation to established ground station terminals. Various levels of coordination are considered. First, satellites coordinate to avoid duplicate efforts for imaging POIs; second, ground stations only service a single satellite at a time for downlinking; and third, satellites may crosslink data within the constellation to enable a more timely delivery of high-valued information as well …
Modeling And Experimentation Of Buckling Of Composite Deployable Booms Under Bending, Christopher D. Rehberg
Modeling And Experimentation Of Buckling Of Composite Deployable Booms Under Bending, Christopher D. Rehberg
Electronic Theses and Dissertations, 2020-2023
This thesis presents experimental and finite element analysis results of eccentrically loaded carbon-fiber composite booms that can deploy solar sails. Using the collapsible tubular mast design along with the geometry from the upcoming Advance Composite Solar Sail System mission, short composite booms segments were manufactured for testing. New clamps were also designed to allow a column bending test to achieve eccentric loading. As buckling through eccentric loading has not previously seen much research, the geometry and composite layups were simplified to allow for ease of manufacturing and verification. The work presented here shows that a finite element simulation, using a …
Energy Based Diagnostics Of Cfd: Revealing New Insights To Complex Aerodynamics, George Loubimov
Energy Based Diagnostics Of Cfd: Revealing New Insights To Complex Aerodynamics, George Loubimov
Electronic Theses and Dissertations, 2020-2023
This thesis documents a new approach to assess the aerodynamics of complex fluid dynamic systems using modern assessment methods associated with computational fluid dynamics (CFD). The method is developed to extract novel and additional insight in the context of a higher-fidelity modeling tool. Although the methods are based on classical control volume techniques balancing fluid momentum and energy, the approach uses the detailed data provided by CFD to expand on it. Classical methods typically use a fixing control volume defined at simple control surfaces, whereas this assessment method utilizes CFD to provide complex integrals on the control surfaces and uses …
Characteristics Of Rotating Detonation Engines For Propulsion And Power Generation, Robert Burke
Characteristics Of Rotating Detonation Engines For Propulsion And Power Generation, Robert Burke
Electronic Theses and Dissertations, 2020-2023
Conventional engines are limited by the efficiency of their combustion mode. Compared to present constant pressure deflagration-based engines, detonation-based systems can realize a higher thermodynamic cycle efficiency, making them an attractive candidate for next generation propulsion systems that will take humanity to hypersonic speeds and even to Mars. For all its performance gains, detonation engines are still far off from implementation. One system, the rotating detonation engine (RDE) is promising as a detonation-based engine concept for its stability, simplicity, and versatility. For these reasons, RDEs have been the subject of studies internationally in efforts to understand their operation and integration …
The Effects Of Supersonic Reacting Flow Over A Wedge, Taylor R. Brown
The Effects Of Supersonic Reacting Flow Over A Wedge, Taylor R. Brown
Honors Undergraduate Theses
There is a growing need for a fundamental understanding of how detonations are formed and sustained as propulsion technology advances toward the use of detonation-based engines. The deflagration-to-detonation transition (DDT) phenomenon is studied to better understand both the fundamentals of detonation physics and the conditions surrounding how detonations are formed and sustained. This research aims to study the effects of a wedge on DDT and detonation formation. A hydrogen-air mixture is pumped into a chamber and ignited by a spark plug. Turbulence-driven flame acceleration is induced by turbulators in the chamber through which the flame propagates. The flame then flows …
Thrust Augmentation Of Rotating Detonation Rocket Engines, Alexander G. Rodriguez
Thrust Augmentation Of Rotating Detonation Rocket Engines, Alexander G. Rodriguez
Honors Undergraduate Theses
This thesis aims to perform a detailed analysis on a 5th Order Polynomial Nozzle, verifying its effectiveness in improving the thrust performance of a Rotating Detonation Rocket Engine. Rotating detonation engines are a promising engine type that uses detonations as a means of combustion rather than traditional conflagration. Through this method, these engines can produce significant amounts of energy while burning less fuel in the process. However, exhaust flow instabilities and swirl limit the engine's potential for use as a means of propulsion. The 5th Order Polynomial Nozzle was previously demonstrated to reduce and control this swirl; however, analysis was …
Vibrations Of Rotationally Periodic Structures: A Metric For Mistuning Characterization And Vibration Localization, Andres Rodriguez
Vibrations Of Rotationally Periodic Structures: A Metric For Mistuning Characterization And Vibration Localization, Andres Rodriguez
Electronic Theses and Dissertations, 2020-2023
Blisk components are an integral part of jet engines and power generation systems. Composed of a single monolithic structure, integral blisks combine the blade-and-disk portion of primary components such as the fan, compressor stage, or turbine stage. This design modification increases the aerodynamic performance while decreasing the cost and eliminating time of assembly. However, these benefits come with the loss of blade-disk connection interfaces, which greatly reduces the structure's damping and its ability to attenuate unwanted structural vibrations. Blisk dynamics are impacted by mistuning, which is a disruption of the periodic symmetry of otherwise identical bladed sections. This disruption degrades …
Generic Behavior Framework Of Sx And Ds Nickel-Base Superalloys With Applications To Constitutive And Life Prediction Modeling, Firat Irmak
Electronic Theses and Dissertations, 2020-2023
Selection of materials to be used for components experiencing extreme conditions is a critical process in the design phase. Nickel-base superalloys have been frequently used for hot gas path components in the turbomachinery industry. These components are required to withstand both fatigue and creep at extreme temperatures during their service time. In general, the extreme temperature materials mostly embody polycrystalline, directionally solidified, and single crystal superalloys. It is essential for design engineers to predict accurate damage behavior and lifespan for these components to prevent catastrophic failures. This dissertation presents a new framework to represent mechanical behavior of Nickel-base superalloys under …
The State Of The Art Of Information Integration In Space Applications, Zhuming Bi, K. L. Yung, Andrew W.H. Ip., Yuk Ming Tang, Chris W.J. Zhang, Li Da Xu
The State Of The Art Of Information Integration In Space Applications, Zhuming Bi, K. L. Yung, Andrew W.H. Ip., Yuk Ming Tang, Chris W.J. Zhang, Li Da Xu
Information Technology & Decision Sciences Faculty Publications
This paper aims to present a comprehensive survey on information integration (II) in space informatics. With an ever-increasing scale and dynamics of complex space systems, II has become essential in dealing with the complexity, changes, dynamics, and uncertainties of space systems. The applications of space II (SII) require addressing some distinctive functional requirements (FRs) of heterogeneity, networking, communication, security, latency, and resilience; while limited works are available to examine recent advances of SII thoroughly. This survey helps to gain the understanding of the state of the art of SII in sense that (1) technical drivers for SII are discussed and …
Drone Cage Design And Implementation To Enable Small Drone Architecture Testing, Marco Fagetti, Emily M. Suh
Drone Cage Design And Implementation To Enable Small Drone Architecture Testing, Marco Fagetti, Emily M. Suh
Undergraduate Student Works
Geometric mechanics is a dynamical formalism that allows for simultaneous treatment of rotational and translational motion without the drawbacks of attitude parameterization sets. While geometric mechanics is well suited to deal with full six degree-of-freedom motion or significant position-attitude coupling, this formalism has yet to be extensively applied to hardware systems. The broader research goals of this work aim to prove the practical viability of this theoretical framework by applying it to a class of Crazyflie drones, which are frequently used to assess Guidance, Navigation, and Control schemes. To efficiently achieve these goals, a reliable, collapsible drone cage is required …
Evaluation Of Onboard Detect-And-Avoid System For Suas Bvlos Operations, Jon M. Loffi, Samuel M. Vance, Jamey Jacob, Luke Spaulding, Jared C. Dunlap
Evaluation Of Onboard Detect-And-Avoid System For Suas Bvlos Operations, Jon M. Loffi, Samuel M. Vance, Jamey Jacob, Luke Spaulding, Jared C. Dunlap
International Journal of Aviation, Aeronautics, and Aerospace
No abstract provided.
Effect Of The Extended Rigid Flapping Trailing Edge Fringe On An S833 Airfoil, Hongtao Yu, Zifeng Yang
Effect Of The Extended Rigid Flapping Trailing Edge Fringe On An S833 Airfoil, Hongtao Yu, Zifeng Yang
Mechanical and Materials Engineering Faculty Publications
A 2D numerical simulation was conducted to investigate the effect of an extended rigid trailing edge fringe with a flapping motion on the S833 airfoil and its wake flow field, as an analogy of an owl’s wing. This study aims to characterize the influence of the extended flapping fringe on the aerodynamic performance and the wake flow characteristics downstream of the airfoil. The length (Le) and flapping frequencies (fe) of the fringe are the key parameters that dominate the impact on the airfoil and the flow field, given that the oscillation angular amplitude is fixed at 5◦. The simulation results …
Influence Of Nonlinear Multiaxial Matrix Viscoelasticity On Piezoresistivity Of Carbon Nanotube Polymer Composites, Wolfgang Klimm
Influence Of Nonlinear Multiaxial Matrix Viscoelasticity On Piezoresistivity Of Carbon Nanotube Polymer Composites, Wolfgang Klimm
Electronic Theses and Dissertations, 2020-2023
Nanocomposites are prominent candidates to extend the capabilities in areas of established fiber reinforced composites. Carbon nanotubes (CNT) with their outstanding mechanical, electrical, and thermal properties are of particular interest. Especially polymers profit from the addition of CNTs, and can be rendered significantly stiffer, stronger, and even electrically conductive. The resulting electrical conductance is deformation-sensitive, known as piezoresistivity, and is utilized in strain sensing applications. However, the polymer matrix introduces time- and temperature-dependency into the mechanical behavior, known as viscoelasticity, and thus affects the relationship between deformation and electrical conductivity over time. Although piezoresistivity and polymer viscoelasticity have been studied …