Advanced Inflatable De-Orbit Solutions For Derelict Satellites And Orbital Debris, 2019 University of Arizona
Advanced Inflatable De-Orbit Solutions For Derelict Satellites And Orbital Debris, Aman Chandra, Greg Wilburn, Jekan Thanga
Space Traffic Management Conference
The exponential rise in small-satellites and CubeSats in Low Earth Orbit (LEO) poses important challenges for future space traffic management. At altitudes of 600 km and lower, aerodynamic drag accelerates de-orbiting of satellites. However, placement of satellites at higher altitudes required for constellations pose important challenges. The satellites will require on-board propulsion to lower their orbits to 600 km and let aerodynamic drag take-over. In this work we analyze solutions for de-orbiting satellites at altitudes of up to 3000 km. We consider a modular robotic de-orbit device that has stowed volume of a regular CubeSat. The de-orbit device would be ...
End To End Satellite Servicing And Space Debris Management, 2019 Univ. of Arizona
End To End Satellite Servicing And Space Debris Management, Aman Chandra, Himangshu Kalita, Roberto Furfaro, Jekan Thanga
Space Traffic Management Conference
There is growing demand for satellite swarms and constellations for global positioning, remote sensing and relay communication in higher LEO orbits. This will result in many obsolete, damaged and abandoned satellites that will remain on-orbit beyond 25 years. These abandoned satellites and space debris maybe economically valuable orbital real-estate and resources that can be reused, repaired or upgraded for future use. Space traffic management is critical to repair damaged satellites, divert satellites into warehouse orbits and effectively deorbit satellites and space debris that are beyond repair and salvage. Current methods for on-orbit capture, servicing and repair require a large service ...
Lasers For Communication And Coordination Control Of Spacecraft Swarms, 2019 University of Arizona
Lasers For Communication And Coordination Control Of Spacecraft Swarms, Himangshu Kalita, Leonard Dean Vance, Vishnu Reddy, Jekan Thanga
Space Traffic Management Conference
Swarms of small spacecraft offer whole new capabilities in Earth observation, global positioning and communications compared to a large monolithic spacecraft. These small spacecraft can provide bigger apertures that increase gain in communication antennas, increase area coverage or effective resolution of distributed cameras and enable persistent observation of ground or space targets. However, there remain important challenges in operating large number of spacecrafts at once. Current methods would require a large number of ground operators monitor and actively control these spacecraft which poses challenges in terms of coordination and control which prevents the technology from scaled up in cost-effective manner ...
Ultrafine Aluminium: Quench Collection Of Agglomerates, 2019 DEFENCE RESEARCH AND DEVELOPMENT ORGANISATION
Ultrafine Aluminium: Quench Collection Of Agglomerates, Tejasvi K, Y Pydi Setty, Vemana Venkateswara Rao
International Journal of Aviation, Aeronautics, and Aerospace
Combustion of aluminized solid propellants exhibits phenomena associated with accumulation, agglomeration, ignition, and combustion of ultra-fine aluminium particles. In this study, agglomeration phenomenon of ultra-fine aluminium in solid propellant combustion is investigated using quench collection experimental technique over the pressure ranges from 2MPa to 8MPa. The ultra-fine aluminium powder synthesized by Radio Frequency Induction Plasma technique having harmonic mean size of 438nm is used for agglomeration study. The quenching distance is varied from 5mm to 71mm from the propellant burning surface to estimate the effect on agglomerate size. The morphology and chemical compositions of the collected products were then studied ...
Additively-Manufactured Hybrid Rocket Consumable Structure For Cubesat Propulsion, 2018 Utah State University
Additively-Manufactured Hybrid Rocket Consumable Structure For Cubesat Propulsion, Britany L. Chamberlain
All Graduate Theses and Dissertations
Three-dimensional, additive printing has emerged as an exciting new technology for the design and manufacture of small spacecraft systems. Using 3-D printed thermoplastic materials, hybrid rocket fuel grains can be printed with nearly any cross-sectional shape, and embedded cavities are easily achieved. Applying this technology to print fuel materials directly into a CubeSat frame results in an efficient, cost-effective alternative to existing CubeSat propulsion systems. Different 3-D printed materials and geometries were evaluated for their performance as propellants and as structural elements. Prototype "thrust columns" with embedded fuel ports were printed from a combination of acrylonitrile utadiene styrene (ABS) and ...
Liquid Jet Penetration And Breakup In A Free Supersonic Gas Jet, 2018 Louisiana State University and Agricultural and Mechanical College
Liquid Jet Penetration And Breakup In A Free Supersonic Gas Jet, Hansen Jones
LSU Master's Theses
In the testing of today’s rocket engines, both on large scale vertical test stands and smaller subscale horizontal component testing stands, it is extremely important to be able to accurately quantify and mitigate the thermal and acoustic loads the engines will generate on test stand infrastructure. Due to the large number of parameters that must be considered for many cases, development of a multi-phase computational code is under way to properly analyze and design water spray cooling systems used at NASA’s Stennis Space Center (SSC) and across other NASA centers. As such, a small-scale experiment has been conducted ...
Design Of A Heavy Lift Rc Aircraft - Society Of Automotive Engineers (Sae) Aero Design® West Competition Team, 2018 Embry-Riddle Aeronautical University
Design Of A Heavy Lift Rc Aircraft - Society Of Automotive Engineers (Sae) Aero Design® West Competition Team, Jiyoung Hwang, Phillip Nielsen
Undergraduate Research Symposium - Prescott
The SAE Aero West design competition challenges undergraduate students to design and build an RC aircraft that will fly with the maximum number of passengers and luggage possible. The ERAU SAE team focuses on simulation-based research and project methods such as Computational Fluid Dynamics (CFD), aircraft optimization, and Finite Element Analysis (FEA). Designing and manufacturing a well-designed heavy lift aircraft and competing with other groups will give experience in solving engineering problems. The Aerodynamics team is currently focusing on score optimization, aircraft performance and configuration. The propulsion team is constructing a test rig to test various propellers and motors to ...
Design Of A Thrust Stand For Low Power Electric Propulsion, 2018 Embry-Riddle Aeronautical University
Design Of A Thrust Stand For Low Power Electric Propulsion, John Norton
Undergraduate Research Symposium - Prescott
Electric propulsion (EP) has been gaining popularity due to the high efficiencies and specific impulse. These thrusters all follow the same general idea of converting stored electrical potential energy to kinetic energy for the craft; typically, this is accomplished by the acceleration of gas particles through three main methods, electrothermal, electromagnetic, and/or electrostatic. The specific impulse is the change of momentum per unit of propellant expended. While chemical propulsion produces a high change in momentum, they use much more propellant mass than an electric thruster. EP devices will typically produce very low thrust, which makes it difficult to measure ...
Investigation Of A Pressure Wave Supercharger For An Industrial Diesel Engine, 2018 Air Force Institute of Technology
Investigation Of A Pressure Wave Supercharger For An Industrial Diesel Engine, Brian A. Beasley
Theses and Dissertations
Internal combustion engines suffer from decreased performance as altitude is in- creased. This performance decrease can be overcome by increasing the pressure in the engine's intake manifold. Typically, this is accomplished with a turbocharger or supercharger. However, mechanical compression devices such as these suffer from decrease compression efficiency as the size of the device decreases. The size of the compression device scales with the amount of mass ow through the device, and the amount of mass ow is proportional to the size of the engine. This means a small turbocharger for a small engine is less efficient than a ...
Application Of Spectral Solution And Neural Network Techniques In Plasma Modeling For Electric Propulsion, 2018 Air Force Institute of Technology
Application Of Spectral Solution And Neural Network Techniques In Plasma Modeling For Electric Propulsion, Joseph R. Whitman
Theses and Dissertations
A solver for Poisson's equation was developed using the Radix-2 FFT method first invented by Carl Friedrich Gauss. Its performance was characterized using simulated data and identical boundary conditions to those found in a Hall Effect Thruster. The characterization showed errors below machine-zero with noise-free data, and above 20% noise-to-signal strength, the error increased linearly with the noise. This solver can be implemented into AFRL's plasma simulator, the Thermophysics Universal Research Framework (TURF) and used to quickly and accurately compute the electric field based on charge distributions. The validity of a machine learning approach and data-based complex system ...
Clean-Fuel E-Vtol Air Mobility Vehicles For Unmanned And Manned Operations, 2018 Alakai Technologies
Clean-Fuel E-Vtol Air Mobility Vehicles For Unmanned And Manned Operations, Larry D. Mccarroll, Brian Morrison, Bruce J. Holmes D.E., Faiaa, Fraes, Henry Vu
National Training Aircraft Symposium (NTAS)
Imagine for a moment, having your very own safe, affordable, clean-fuel, point-to-any point vehicle for travel in the 21st-century 3-dimensional airspace system. Your ultra-reliable e-VTOL allows commuters to leave behind the constraints of hub-and-spoke airports, and the congestion of interstates, turnpikes and freeways. Facilitating Inter- and Intra-urban travel, such as downtown-to-airport, or metropolis-to-metropolis, or home-to-work. Perfect for dense urban environments worldwide. And all while offering the clean power of hydrogen for zero-emission travel.
This vision for efficient, clean, delay-free mobility has been talked about for decades, but always waived aside as some kind of futurist vision. This future requires tackling ...
Experimental Evaluation Of A Krypton Propellant Arrangement In A T-100-3 Hall-Effect Thruster, 2018 Purdue University
Experimental Evaluation Of A Krypton Propellant Arrangement In A T-100-3 Hall-Effect Thruster, Adam Patel, Javier Cortina Fernandez, Justin Chow, Osvaldo Alejandro Martin, Alexey Shashurin
The Summer Undergraduate Research Fellowship (SURF) Symposium
Stationary Hall thrusters are electric, moderate-specific impulse propulsion systems developed in Russia. These devices manipulate electric and magnetic fields to expel ionized gas (plasma) components, resulting in thrust. The success of Hall-effect engines in USSR satellite-transfer missions quickly sparked western interest in the design. Extensive government and academic study commenced shortly after the dissolution of the Soviet Union, when the technology was made available to the United States. The common SPT-100 model was the primary subject of such studies. Unfortunately, limited literature exists for rare and uncommon Hall thruster models. The T-100-3 stationary plasma thruster suffers from this gap; few ...
Fuel Flow Reduction Impact Analysis Of Drag Reducing Film Applied To Aircraft Wings, 2018 Southern Methodist University
Fuel Flow Reduction Impact Analysis Of Drag Reducing Film Applied To Aircraft Wings, Damon Resnick, Chris Donlan, Nimish Sakalle, Cody Pinkerman
SMU Data Science Review
In this paper, we present an analysis of flight data in order to determine whether the application of the Edge Aerodynamix Conformal Vortex Generator (CVG), applied to the wings of aircraft, reduces fuel flow during cruising conditions of flight. The CVG is a special treatment and film applied to the wings of an aircraft to protect the wings and reduce the non-laminar flow of air around the wings during flight. It is thought that by reducing the non-laminar flow or vortices around and directly behind the wings that an aircraft will move more smoothly through the air and provide a ...
Electrode Geometry Effects In An Electrothermal Plasma Microthruster, 2018 California Polytechnic State University, San Luis Obispo
Electrode Geometry Effects In An Electrothermal Plasma Microthruster, Harrison Raymond King
Master's Theses and Project Reports
Nanosatellites, such as Cubesats, are a rapidly growing sector of the space industry. Their popularity stems from their low development cost, short development cycle, and the widespread availability of COTS subsystems. Budget-conscious spacecraft designers are working to expand the range of missions that can be accomplished with nanosatellites, and a key area of development fueling this expansion is the creation of micropropulsion systems. One such system, originally developed at the Australian National University (ANU), is an electrothermal plasma thruster known as Pocket Rocket (PR). This device heats neutral propellant gas by exposing it to a Capacitively Coupled Plasma (CCP), then ...
Development Of Digital Diary For Enhanced Parental School Involvement In Tanzania, 2018 University of Dar es Salaam
Development Of Digital Diary For Enhanced Parental School Involvement In Tanzania, Sekione R. Jeremiah, Joel S. Mtebe Phd
The African Journal of Information Systems
The study examined the use of digital diary as a tool for enhancing parental school involvement in Tanzania. The development of the digital diary followed eXtreme Programming agile method where 87 parents and 6 teachers from St. Florence school were involved. Parents and teachers were given six months to use the tool before testing for its effectiveness using data from 7 teachers and 156 parents through semi-structured interviews and questionnaires respectively. The study found that the majority of respondents (84.4% of parents and 96.7% of teachers) indicated that the digital diary was useful tool as enabled them to ...
Depot For Martian And Extraterrestrial Transport Resupply (Demetr), 2018 University of Tennessee-Knoxville
Depot For Martian And Extraterrestrial Transport Resupply (Demetr), Emily Beckman, Ethan Vogel, Caleb Peck, Nicholas Patterson
University of Tennessee Honors Thesis Projects
No abstract provided.
Additive Manufacturing Of High Solids Loading Hybrid Rocket Fuel Grains, 2018 Olivet Nazarene University
Additive Manufacturing Of High Solids Loading Hybrid Rocket Fuel Grains, Stephen P. Johnson
Scholar Week 2016 - present
Hybrid rocket motors offer many of the benefits of both liquid and solid rocket systems. Like liquid engines, hybrid rocket motors are able to be throttled, can be stopped and restarted, and are safer than solid rocket motors since the fuel and oxidizer are in different physical states. Hybrid rocket motors are similar to solid motors in that they are relatively simple and have a high density-specific impulse. One of the major drawbacks of hybrid rocket motors is a slower burning rate than solid rocket motors. Complex port geometries provide greater burning surface area to compensate for lower burning rates ...
Algal Biofuel: The Future Of Green Jet Fuel In Air Transportation, 2018 Embry-Riddle Aeronautical University
Algal Biofuel: The Future Of Green Jet Fuel In Air Transportation, Rajee Olaganathan
The aviation industry is one of the major contributors for the greenhouse gases. As air travel has become inevitable in this modern era, and fossil fuel usage is not sustainable, it is essential to produce renewable fuel and commercialize it to reduce the greenhouse gas emissions. In order to produce an alternate aviation biofuel a lot of industrial and academic collaborations have been developed worldwide. The main concern of this collaborative research is to produce aviation biofuel from renewable resources with low environmental impacts, and which is sustainable at an economically viable price. This mini-review briefly discusses the biotechnological approaches ...
Laser Ablation Synthesis Of Energetic Graphitic Coated Aluminum Nanoparticles, 2018 University of Tennessee, Knoxville
Laser Ablation Synthesis Of Energetic Graphitic Coated Aluminum Nanoparticles, Camille E. Bergin
EURēCA: Exhibition of Undergraduate Research and Creative Achievement
This poster presents a research initiative in collaboration with the US Army Research Lab (ARL) to synthesize carbon-coated aluminum (Al) nanoparticles (NPs) as energetic materials via laser ablation in organic solutions. Nanomaterials have gained widespread attention recently from an array of scientists and engineers for their desired physical and chemical properties believed to be a product of their high ratio of surface area to volume, thus making them favorable for a wide variety of applications. Specifically, here Al NPs are favored for their energetic characteristics and usually employed as solid-state propellants. However, it is challenging and unsafe to preserve pristine ...
Pseudo Linear Hall Effect Thruster Characterization Through Potential, Magnetic, And Optical Measurements, 2018 Air Force Institute of Technology
Pseudo Linear Hall Effect Thruster Characterization Through Potential, Magnetic, And Optical Measurements, Braeden A. Sheets
Theses and Dissertations
Electric propulsion systems are a more mass efficient method for providing a change in velocity, ΔV, to on-orbit spacecraft, than their chemical counterparts. In comparison, electric systems generally have a much higher specific impulse, Isp, than chemical systems. One option within the realm of electric propulsion is Hall Effect Thrusters, which have moderately high specific impulse values. From their advent in the 1960s, Hall Effect Thrusters have been used for orbit station keeping, attitude control, and orbit transfer. Although the discharge cavity is conventionally circular, pseudo-linear or racetrack shaped cavities have been developed. Even though Hall thrusters have decades of ...