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.
Results
Showing 1 to 20 of 955 for “"Launch"”.
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Investigating Variation in Launch Vehicle Atmospheric Impact by Launch Latitude and Season
Launch vehicles are a significant anthropogenic atmospheric emissions vector, and in the past have been shown to cause up to 50% as much global heating as aviation CO2. Despite this high magnitude of emissions impact, few studies quantify the variation in launch vehicle emissions beyond exploring …
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Nanosatellite Launch Data-Logger (Sync)
… may not survive the required absolute-worst-case launch vibration testing needed for flight certification. To help address this problem, and to better match testing conditions to real-world launch environments, this thesis introduces Sync, a compact 1/4U CubeSat payload designed to collect data on …
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Enabling effective product launch decisions
… of optimizing the performance of product launch decisions-in particular, the decisions of product development duration and manufacturing ramp-up. It presents an innovative model for measuring product launch performance and optimizing the decisions by integrating a design structure matrix …
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Enhancement and the Launch of Odyssey
<p>The Change Leadership Plan utilizes student data garnered from the Program Evaluation to assist in the creation and implementation of the 'Enhancement' program. The Enhancement program is a research-based in-school student intervention developed in response to over two-thirds of Brooks Middle …
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Space Launch Environment and Vibration Testing
… is through the one-axis-at-a-time; however, the launch vibration environment used to be a simultaneous six-axis, including three translational and three rotational. Literature suggests that the multi-axis environment induces different acceleration and stress states in the article, but fails to …
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Redefining “Space Sustainability” for Launch Vehicles: Forecasting the Atmospheric Impact of the Commercial Space Launch Industry in 2050
… few studies have examined emissions from the launches themselves. Along with reentry burnup, rocket launches are the only source of high altitude anthropogenic emissions. At such high altitudes, emitted particles can remain in circulation for years. With the annual growth rate of the …
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Implementace Launch Control na monopost Formule Student
… práce se zabývá návrhem a implementací algoritmu Launch control (Řízení prokluzu kol), který je specificky navržen pro nejlepší možnou akceleraci vozidla. Tento algoritmus je podmnožinou tzv. Trakční kontroly. Algoritmus ovládá točivý moment každého kola na základě úhlové rychlosti daného kola a …
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Commonality of ground systems in launch operations
… large-scale engineering systems used to support launch operations is relatively unknown. A broad literature review conducted for this paper did not yield a single paper specifically addressing the application of commonality for ground systems at any launch site in the United States or abroad. …
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Estimating launch vehicle trajectories and atmospheric emissions
Launch vehicles enable Earth observation, navigation or space exploration. In doing so, they cause direct anthropogenic emissions in the troposphere and above. This comes with an environmental cost. They can emit carbon dioxide (CO2), water vapor, chlorine, aluminum oxide, black carbon and nitrogen …
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Modeling Launch Vehicle Success Using Artificial Neural Networks
<p>Expendable launch vehicles in the United States currently have a reliability of 92%. The failures that do occur cost millions of dollars in spacecraft replacement, lost revenue, and other expenses. These costs are passed on in higher insurance rates and launch vehicle price. If the launch …
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Friction and Wear Performance of Lifeboat Launch Slipways
… it is necessary to use an inclined slipway to launch a large lifeboat. Lifeboat slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway of nickel/chromium coated steel, the lifeboat is released from the top of the slipway and proceeds …
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A systems study of very small launch vehicles
… the perform&ace and feasibility of very small launch vehicles (15 kg- 2000 kg liftoff mass). Gross payload performance for several vehicles was calculated with a commercial three degree of freedom trajectory code. The significance of aerodynamic drag on small vehicles is discussed. Both the …
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Unidirectional active acoustic control for launch vehicle fairings
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Vibroacoustic modeling and control for launch vehilce shrouds
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Strategies for launch and assembly of modular spacecraft
… issue of high costs for access to space. While launch vehicle trades for exploration programs are relatively well understood, on-orbit assembly has been given much less attention, but is an equally important component of the infrastructure enabling human access to space. Two separate but related …
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Enhancing the orbital utilization of expendable launch vehicles
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988, and (M.S.)--Massachusetts Institute of Technology, Technology and Policy, 1988.
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Safety-guided design & analysis of space launch vehicles
The advent of commercial launch systems has brought about a new age of space launch vehicle design. In order to survive in a competitive market, space launch providers must design systems with new technologies in shorter development times. This changing nature of space launch vehicle design …
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Controller Design for a Swirl Injection Hybrid Launch Vehicle
… on the design of controllers for stabilizing a launch vehicle with an internally originating torque. The motivation for this research arises from the new development of rocket engines which swirl combustion gases to gain combustion stability benefits, and in the case of hybrid rocket engines, …
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Stochastic Methods for Robust Design of Launch Vehicle Structures
… thin-shelled structures, commonly used on launch vehicles such as the Ariane family, has been widely studied since the 1930s. Research in this area has resulted in a variety of analytical and empirical design procedures to account for the diminished buckling loads of such shells. Some …
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