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Articles 1 - 4 of 4
Full-Text Articles in Engineering
Thermoanalytical Studies On The Decomposition Of Energetic Ionic Liquids, Alan Esparza
Thermoanalytical Studies On The Decomposition Of Energetic Ionic Liquids, Alan Esparza
Open Access Theses & Dissertations
Hydrazine has been extensively used as a propellant for space applications for more than half a century. However, its hazardous characteristics cause high storage and handling costs. For this reason, the search for alternatives, the so-called “green monopropellants,” is of great interest. Most green monopropellants are mixtures of an oxidizer and a fuel, and several ionic liquids (ILs) have been proposed for this application. Among them, hydroxylammonium nitrate (HAN) and 2-hydroxylethylhydrazinium nitrate (HEHN) are promising oxidizer and fuel, respectively. The objective of the present work was to clarify the decomposition kinetics of both HAN and HEHN, using thermogravimetric analysis (TGA), …
Bio-Inspired Method For Close-Proximity Operations On A Near-Earth Asteroid, Rene Alberto Valenzuela Najera
Bio-Inspired Method For Close-Proximity Operations On A Near-Earth Asteroid, Rene Alberto Valenzuela Najera
Open Access Theses & Dissertations
Space maneuvers in the vicinity of small celestial bodies and achieving a soft landing over the surface of small celestial bodies are essential movements to advance the status of exploration, collection of geographical data, measurement of physical properties among other on-orbit tasks. Before a spacecraft reaches hovering position over an asteroid in order to perform orbital tasks, close-proximity operations must be done. Since the movements of the spaceships depend on the acceleration forces provided by the thrusters and external disturbances forces, the correct planning of execution of the close-up trajectories on the celestial body orbit and trajectory to land on …
Development Of A Cold Gas Propulsion System For A 1u Cube Satellite, Norma Alicia Perea
Development Of A Cold Gas Propulsion System For A 1u Cube Satellite, Norma Alicia Perea
Open Access Theses & Dissertations
In efforts to further the development test capabilities of nanosatellites on earth, NASA White Sands Test Facility (WSTF) is developing a Magnetic Levitation Table (MLT) for ground testing of nanosatellites. Testing of the table requires dedicated test articles that employ space-like systems, but those that can be used in the confines of a small lab testing area. In collaboration with WSTF, the University of Texas at El Paso (UTEP) Center for Aerospace Exploration Technology Research (cSETR) is developing an 1U cold gas propulsion cube-satellite demonstrator (CGD) to test capabilities of the levitation table. A 1U cube satellite was designed with …
Planar Motion Control Of A Cube Satellite Using Cold Gas Thrusters, Christian Lozoya
Planar Motion Control Of A Cube Satellite Using Cold Gas Thrusters, Christian Lozoya
Open Access Theses & Dissertations
This Thesis presents a mathematical model developed for the computational simulation ofCubeSat movement using four thrusters that permit uniaxial translation and rotation. Arbitrary functions are fit to boundary conditions to simulate the force, acceleration, velocity, and displacement of the CubeSat along a plane. The model is used to derive a motion control algorithm assuming constant pressure and mass. A single model describes both translation and rotation. This Thesis also explores the relationship between propellant consumption and the time required to complete a displacement implied by the model.