Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 79 for “"rockets"”.
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Guidance and control of sounding rockets
… Astronomical Observatory (SAAO). Sounding rockets carry instruments with which to take measurements in the Earth’s atmosphere in sub-orbital flight. The South African Astronomical Observatory (SAAO) requires a flight computer for their sounding rockets. This flight computer is to replace …
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Reconstructing rockets--the politics of developing military technology in Brazil, India, and Israel
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Political Science, 1993.
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Design, Development, and Calibration of an Electric Field Probe for Use on Sounding Rockets
… being conducted through high-altitude sounding rockets. These rockets allow for in-situ measurements of the physical parameters of the upper atmosphere which in turn helps in the answering of important questions in space science. In order to quantify the force a charged particle in space will …
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Effects of a Slow Gas-Phase Reaction on the L(*) Instability in Solid-Propellant Rockets
L*-instability stemming from the interaction between the thermal relaxation in the solid propellant and the bulk-mode gas motion inside the combustion chamber is examined theoretically and numerically. The explosion reaction, following the quasisteady fizz reaction occurring near the burning …
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X-ray searches for decaying sterile neutrinos with the Micro-X and XQC sounding rockets
The nature of dark matter is a major question in modern physics. Cosmological measurements have motivated the existence of matter beyond the standard model, but thus far there has not been a definitive observation of any particular candidate. One proposed particle is the sterile neutrino, a …
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Modeling dispersions in initial conditions for air-launched rockets and their effect on vehicle performance
Growing interest in air-launched rockets as a method for lofting satellites into orbit motivates the need to investigate the unique challenges that air launch presents. This thesis explores how uncertainties in an air-launched rocket's state at ignition can affect system performance and …
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A feasibility study of the use of microwaves to measure radical and differential burning rates in solid propellant rockets
The subject investigation demonstrated that it is feasible to use the microwave technique to measure radial burning rates ,and differential burning rates in solid propellant rocket motors. A simulator, consisting of a spiral rotating in an oil bath, was used to represent the curved burning surface …
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Redefining “Space Sustainability” for Launch Vehicles: Forecasting the Atmospheric Impact of the Commercial Space Launch Industry in 2050
… the black carbon emitted by kerosene and methane rockets causes an indirect increase in stratospheric ozone due to the removal of NOx, with ozone column change averaging 5.07 Dobson Units (DU) and 1.26 DU respectively; hydrogen rockets cause a net decrease in ozone column averaging -0.11 DU. The …
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Hybrid Rocket Motor Scaling Process
… promise for the next generation of sounding rockets and small launch vehicles. This paper seeks to provide details on the process of developing hybrid propulsion systems to the academic and amateur rocket communities to assist in future research and development. Scaling hybrid rocket motors …
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Low Cost Magnetometer Calibration and Distributed Simultaneous Multipoint Ionospheric Measurements from a Sounding Rocket Platform
… in the ionosphere, either onboard sounding rockets or on CubeSats. The Space and Atmospheric Instrumentation Laboratory (SAIL) at Embry-Riddle Aeronautical University has launched a multitude of sounding rockets in recent history: one night-time mid-latitude rocket from Wallops Flight …
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COST ANALYSIS FOR 3D PRINTED COUNTER-UNMANNED AERIAL SYSTEM (C-UAS) GUIDED ROCKET PROTOTYPE
… the United States is to develop its own low-cost rockets that are capable of successfully engaging and downing UAS. USINDOPACOM is currently working on a viable prototype that leverages off the shelf parts and 3D printed components that could pave the path for viable alternatives. However, …
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Estimating launch vehicle trajectories and atmospheric emissions
… were part of national security concerns, rockets have not been subjected to environmental regulation. The few studies in the 1990s due to the decreasing number of launches have helped rockets avoid any policy regulation. However, the development of commercial launches and the evolution of …
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A nonequilibrium plasmadynamics model for nitrogen/hydrogen arcjets
… temperatures and specific impulse than chemical rockets. Despite the relative simplicity of the basic design, many complex physical processes are poorly understood. Less than 50% of the electrical power is converted to thrust kinetic power.
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Design, analysis, and control of a nitinol shape memory alloy rotary actuator for spacecraft deployable structures
… and in academia. The new availability of rockets such as SpaceX's Falcon 9 or even dedicated CubeSat rockets such as Rocket Lab's Electron rocket have provided a new opportunity for many organizations to launch satellites. Depending on the goals of each satellite, they can be configured …
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A Study into Data Analysis of Varying Types of Langmuir Probes
… platforms, including experimental sounding rockets for measurements in mesosphere-lower-thermosphere, and also onboard satellites to obtain data sets over an extended period of time in the ionosphere. To accommodate such different situations, many different variations of the Langmuir probe …
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Development, modeling and testing of thermal protection systems in small, slow-burning solid rocket motors
… of previous research in slow, end burning solid rockets, this problem is approached through both experimental and computational means. Experimental tests are performed on a full-scale model of an end-burning motor. Experimental results are used to validate a computational model of ablation. The …
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Real-Time Trajectory Optimization for High-Performance Guidance & Control
… agile autonomous systems—such as reusable rockets—that mandate high-performance guidance & control.
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Exploration and Development of Electrically Controllable Gel and Solid Propellants
… of rocket motors in particular solid rockets. Traditional solid rockets do not have the capability to modify the burning rate on demand during operation, which greatly limits operational capabilities. The research outlined in this dissertation explores the fundamentals in the creation …
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Solid amine-boranes as high performance hypergolic hybrid rocket fuels
<p>Hypergolic hybrid rockets have the potential of providing systems that are simple, reliable, have high performance, and allow for energy management. Such a propulsion system can be applied to fields that need a single tactical motor with flexible mission requirements of either high speed to …
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