Defect Detectability Improvement For Conventional Friction Stir Welds, 2013 University of Alabama in Huntsville
Defect Detectability Improvement For Conventional Friction Stir Welds, Chris Hill
Von Braun Symposium Student Posters
No abstract provided.
Flightlines, Vol. 20, No. 2, 2013 St. Cloud State University
Flightlines, Vol. 20, No. 2, Jeffrey A. Johnson
Flightlines Newsletter
No abstract provided.
Interplanetary Hitchhiking To Support Small Spacecraft Missions Beyond Earth Orbit, 2013 SelectedWorks
Interplanetary Hitchhiking To Support Small Spacecraft Missions Beyond Earth Orbit, Donovan Torgerson, Anders Nervold, Jeremy Straub, Josh Berk, Ronald Marsh, Scott Kerlin
Jeremy Straub
The development of small spacecraft in educational institutions has traditionally been hampered by the high costs and integration complexities of launches. NASA’s Educational Launch of Nanosatellites program (ELaNa), kick started the concept of hitchhiking for free on a rocket launch to low-Earth or geostationary orbit. An ELaNa launch is typically provided by grouping multiple educational nanosatellites together in a rocket that is already carrying a larger and more expensive primary payload. In essence, providing the nanosats with a free hitchhike to space. The program promotes research and education by giving participants first-hand experience in spacecraft design and development.
Although the …
Orbital Position, Transmission Path And Spacecraft Attitude Determination For A Solar Power Spacecraft, 2013 SelectedWorks
Orbital Position, Transmission Path And Spacecraft Attitude Determination For A Solar Power Spacecraft, Jeremy Straub, Corey Bergsrud
Jeremy Straub
A constellation of solar power spacecraft (SPS) to provide power to orbital assets or ground locations (on Earth or another planet) requires software to determine what the most efficient configuration of the spacecraft is (to service all required clients with the required service level) and how to achieve this configuration.
This paper presents an algorithm for attitude control and constellation design and implementation for these spacecraft. This algorithm makes trade-offs between servicing multiple (possibly conflicting) orbital consumer needs, attitude change costs and constellation sustainability. The paper concludes by considering the processing requirements imposed on the spacecraft by this software, across …
Identifying And Correcting First Order Effects In Explanatory Variables For Longitudinal Real Time Parameter Identification Methods In Atmospheric Turbulence, 2013 University of Tennessee, Knoxville
Identifying And Correcting First Order Effects In Explanatory Variables For Longitudinal Real Time Parameter Identification Methods In Atmospheric Turbulence, Borja Martos
Doctoral Dissertations
The use of real time parameter estimation methods for dynamic flight modeling in atmospheric turbulence was studied. Real time parameter estimation results of flight data in atmospheric turbulence and in a calm atmosphere were used to explain the problem and identify potential error sources. The use of indirect atmospheric turbulence measurements for real-time parameter estimation in a linear longitudinal dynamics model was studied to account for atmospheric turbulence. It is shown that measuring the air data angles correctly makes it possible to account for atmospheric turbulence as a measured explanatory variable in the parameter estimation problem. Commercial off-the-shelf sensors were …
A Study Of The Collisional Evolution Of Orbital Debris In Geopotential Wells And Geo Disposal Orbits, 2013 California Polytechnic State University, San Luis Obispo
A Study Of The Collisional Evolution Of Orbital Debris In Geopotential Wells And Geo Disposal Orbits, Christina R. Diaz
Master's Theses
This thesis will present the effects of the orbital debris evolution in two key areas: the geosynchronous disposal orbit regime known as “graveyard” and the two geopotential wells found in 105◦ W and 75◦ E longitude bins. After developing a GEO specific orbit propagator for NASA Johnson Space Center’s Orbital Debris Of- fice, collisions were simulated throughout these regimes using a low velocity breakup model. This model considered the effects of perturbations particularly non-spherical Earth effects (specifically sectorial and zonal harmonics), lunar effects, third body effects and solar radiation pressure effects. The results show that CDPROP does well in simulating …
Thermal Analysis Of A Monopropellant Micropropulsion System For A Cubesat, 2013 California Polytechnic State University, San Luis Obispo
Thermal Analysis Of A Monopropellant Micropropulsion System For A Cubesat, Erin C. Stearns
Master's Theses
Propulsive capabilities on a CubeSat are the next step in advancement in the Aerospace Industry. This is no longer a quest that is being sought by just university programs, but a challenge that is being taken on by all of the industry due to the low-cost missions that can be accomplished. At this time, all of the proposed micro-thruster systems still require some form of development or testing before being flight-ready. Stellar Exploration, Inc. is developing a monopropellant micropropulsion system designed specifically for CubeSat application.
The addition of a thruster to a CubeSat would expand the possibilities of what CubeSat …
The Feasibility And Application Of Observing Small Leo Satellites With Amateur Telescopes, 2013 California Polytechnic State University, San Luis Obispo
The Feasibility And Application Of Observing Small Leo Satellites With Amateur Telescopes, Brock Schmalzel
Master's Theses
This thesis demonstrates that any individual can provide relevant observational data to further research efforts within the Aerospace community, through the use of amateur telescopes. A Meade LX200 12 in. telescope and Lumenera Skynyx 2.0 camera were utilized to observe small LEO satellites, using a well-documented point-and-wait staring method. Over a period of three months, a total of 186 observation attempts were made resulting in 97 successful captures. From the gathered data, three possible aerospace applications were analyzed: validation of a satellite brightness prediction model, angles-only orbit determination including extended Kalman filtering, and temporal error growth in TLE-based orbit propagation. …
An Interoperable Executive Library For Loosely Coupled Physics Systems, 2013 University of Tennessee - Knoxville
An Interoperable Executive Library For Loosely Coupled Physics Systems, Andrew Austin Kail
Masters Theses
The complexity of simulating any system-wide process involving biomedical processes or thermal-fluid systems goes beyond the reach of a single computer code. In this document I present an Interoperable Executive Library (IEL) that has been designed to run, in parallel, a collection of multi-component physics simulations. The IEL is a light-weight integrator responsible for managing the distribution of data and memory, coordinating communication among parallel processes, and direct execution of a set of loosely coupled numerical and physics tasks HPC resources
Presented are two case studies utilizing the IEL. The first case simulates conjugate heat transfer coupled with a potential …
Ramjet Combustion Chamber, 2013 California Polytechnic State University, San Luis Obispo
Ramjet Combustion Chamber, Paul Cameron Stone
Aerospace Engineering
A ramjet combustion chamber is designed and some initial assembly fabrication and test completed as a component of a ramjet graduate project for California Polytechnic State University, San Luis Obispo Supersonic Wind Tunnel. The combustor design is driven by a theoretical model created by a Cal Poly graduate student, Harrison Sykes. Temperature, pressure, and fuel flow will be measured.
Paschen Breakdown In A Co2 Atmosphere, 2013 California Polytechnic State University, San Luis Obispo
Paschen Breakdown In A Co2 Atmosphere, Matthew T. Stumbo
Aerospace Engineering
This report observes and analyzes the effect the pressure and gap distance have on the minimum positive breakdown potential between two parallel plate copper electrodes in both air and CO2. Two gap distances, 0.57 cm and 2.44 cm, were used. Paschen Curves generated in air from these distances had a strong positive correlation with a Spearman correlation coefficient of 0.97. Curves generated in CO2 had a Spearman correlation coefficient of 0.87. The strong correlation for both gases verifies Paschen's Law. The minimum breakdown potential in air was 361 ± 2 V at a pressure x gap distance …
Thermal Vacuum Chamber Operation And Testing, 2013 California Polytechnic State University, San Luis Obispo
Thermal Vacuum Chamber Operation And Testing, Leila Tebyani
Aerospace Engineering
The purpose of this senior project is to understand the capabilities of the thermal vacuum chamber in the Space Environments Laboratory at California Polytechnic State University and compare the performance to thermal vacuum chambers used in the aerospace industry. The lowest temperature attained inside the chamber during an experiment at ambient pressure was -33°C. The lowest pressure reached by the vacuum chamber at the time of this project was 5e-5 Torr. This report also yields recommendations for integrating a demonstation of the effects of thermal variation in space on spacecraft components for the class AERO 471. A lit LED can …
Synergistic Effects Of Atomic Oxygen And Ultraviolet Radiation Exposure On Various Spacecraft Materials, 2013 California Polytechnic State University, San Luis Obispo
Synergistic Effects Of Atomic Oxygen And Ultraviolet Radiation Exposure On Various Spacecraft Materials, Adrian L. Doan
Aerospace Engineering
The Aerospace Engineering Space Environments Laboratory at California Polytechnic State University features a ground-based system capable of generating atomic oxygen (AO) and vacuum ultraviolet (VUV) radiation environments, constructed by Max Glicklin in 2012. Experiments using three different spacecraft materials were conducted to test the individual and synergistic effects of these naturally occurring phenomena. Kapton HN functioned as a means to provide initial validation of the presence of AO and VUV radiation. Kapton HN also functioned as a test-fluence standard during testing of two other materials. These materials included aluminized beta cloth, with the non-aluminized side being tested, and Indium-Tin-Oxide (ITO) …
Redesigned Aerospace Control System Platform For Laboratory Re-Purposing, 2013 California Polytechnic State University, San Luis Obispo
Redesigned Aerospace Control System Platform For Laboratory Re-Purposing, Ryan W. Moskaluk
Aerospace Engineering
This senior project encompasses using an aircraft model in conjunction with the 3' by 4' low speed wind tunnel at Cal Poly San Luis Obispo. The aircraft model is controlled through piezoelectric actuators embedded inside the flexible tail structure via a PID controller. The objective for this project is to demonstrate the effect of tuning the individual PID controller gains with the aircraft model inside the low speed wind tunnel and to create an easy to use graphical user interface for doing so.
Enabling Interplanetary Small Spacecraft Science Missions With Model Based Data Analysis, 2013 SelectedWorks
Enabling Interplanetary Small Spacecraft Science Missions With Model Based Data Analysis, Jeremy Straub
Jeremy Straub
Small spacecraft operating outside of Earth orbit are significantly constrained by the communica- tions link available to them. This is particularly true for stand-alone craft that must rely on their own antenna and transmission systems (for which gain and available power generation are limited by form factor); it is also applicable to ‘hitchhiker’-style missions which may be able to utilize (quite likely very limited amounts of) time on the primary spacecraft’s communications equip- ment for long-haul transmission.
This poster presents the adaptation of the Model-Based Transmission Reduction (MBTR) frame- work’s Model-Based Data Analysis (MBDA) component for use on an interplanetary …
Open Beyond Orbit: Using The Designs From The Open Prototype For Educational Nanosats Outside Of Earth Orbit, 2013 SelectedWorks
Open Beyond Orbit: Using The Designs From The Open Prototype For Educational Nanosats Outside Of Earth Orbit, Jeremy Straub
Jeremy Straub
This paper presents an overview of the Open Prototype for Educational NanoSats (OPEN) and its prospective use in interplanetary missions. OPEN is framework to facilitate the low-cost creation of CubeSat-class spacecraft via using publically available (provided by the OPEN project) de- signs, software, fabrication instructions and test plans. The base open configuration is designed to be able to be produced with a parts budget of under $5,000. Despite this low cost, it is a very ro- bust spacecraft (with capabilities meeting or exceeding many of the vendor-kit solutions which cost eight-or-more times this amount).
Two approaches for using the OPEN …
Micrometeoroid Fluence Variation In Critical Orbits Due To Asteroid Disruption, 2013 California Polytechnic State University, San Luis Obispo
Micrometeoroid Fluence Variation In Critical Orbits Due To Asteroid Disruption, Eliot Dan Aretskin-Hariton
Master's Theses
Micrometeoroids and orbital debris (MMOD) is a growing issue with international importance. Micrometeoroids are naturally occurring fragments of rock and dusk that exist throughout the solar system. Orbital debris is human made material like rocket bodies, paint flakes, and the effluent of spacecraft collisions. Even small MMOD particles on the order of 1 cm in diameter have the potential to destroy critical spacecraft systems. Because of this, MMOD is a threat to all spacecraft in orbit. Even governments that most sternly oppose US international policy have a stake when it comes to minimizing MMOD flux. Space-based assets are essential to …
Improvement Of Electromagnetic Railgun Barrel Performance And Lifetime By Method Of Interfaces And Augmented Projectiles, 2013 California Polytechnic State University, San Luis Obispo
Improvement Of Electromagnetic Railgun Barrel Performance And Lifetime By Method Of Interfaces And Augmented Projectiles, Aleksey D. Pavlov
Master's Theses
Several methods of increasing railgun barrel performance and lifetime are investigated. These include two different barrel-projectile interface coatings: a solid graphite coating and a liquid eutectic indium-gallium alloy coating. These coatings are characterized and their usability in a railgun application is evaluated. A new type of projectile, in which the electrical conductivity varies as a function of position in order to condition current flow, is proposed and simulated with FEA software. The graphite coating was found to measurably reduce the forces of friction inside the bore but was so thin that it did not improve contact. The added contact resistance …
Design, Fabrication, And Testing Of An Emr Based Orbital Debris Impact Testing Platform, 2013 California Polytechnic State University, San Luis Obispo
Design, Fabrication, And Testing Of An Emr Based Orbital Debris Impact Testing Platform, Jeffrey J. Maniglia Jr.
Master's Theses
This paper describes the changes made from Cal Poly’s initial railgun system, the Mk. 1 railgun, to the Mk. 1.1 system, as well as the design, fabrication, and testing of a newer and larger Mk. 2 railgun system. The Mk. 1.1 system is developed as a more efficient alteration of the original Mk. 1 system, but is found to be defective due to hardware deficiencies and failure, as well as unforeseen efficiency losses. A Mk. 2 system is developed and built around donated hardware from the Naval Postgraduate School. The Mk. 2 system strove to implement an efficient, augmented, electromagnetic …
The Development Of The Turbojet Engine In Britain And Germany As A Lens For Future Developments, 2013 University of Tennessee, Knoxville
The Development Of The Turbojet Engine In Britain And Germany As A Lens For Future Developments, Ethan Zachariah Cansler
Chancellor’s Honors Program Projects
No abstract provided.