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 10 of 10 for “"launch systems"”.
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An Examination of Post-Cold War American and Russian Space Launch Systems
… meanwhile, has been more subtle. Plans for new launch systems have been scrapped and NASA's budget is in danger of suffering deep cuts at a time when current launch systems are approaching the end of their operational lives. By examining the policies and acquisitions of both space programs …
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Experimental Investigation and CFD Simulation of Active Damping Mechanism for Propellant Slosh in Spacecraft Launch Systems
… separation and trajectory correction of the launch vehicle is known as propellant slosh. If unchecked, propellant slosh can reach resonance and lead to complete loss of the spacecraft stability, it can change the trajectory of the vehicle or increase consumption of propellant from the …
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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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Designing sustainable heavy lift launch vehicle architectures adaptability, lock-in, and system evolution
… on the development of a sustainable heavy lift launch vehicle (HLLV). But what exactly is sustainability in the context of launch systems and how can it addressed in the design process? A HLLV must balance myriad technical and programmatic factors such as performance, reliability, cost, …
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Influence Map Methodology For Evaluating Systemic Safety Issues
… of accident investigations and safety reporting systems. Organizations must balance efforts to identify causes of specific accidents with efforts to evaluate systemic safety issues in order to become more proactive about improving safety. This research successfully addressed two problems: (1) …
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Experimental investigation of microfabricated bipropellant rocket engines
… missions begin to require smaller satellites, launch systems and attitude control thrusters of reduced mass will be required. Microrocket engines could provide a low mass, high specific impulse, modular answer to these needs. These small rocket engines would produce thrust of order of 10's of …
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A framework for safe system design in space launch vehicles
… analysis for the test firing of NASA's Space Launch System core stage is performed using a systems-based alternative to the traditional reliability-based method. The method used, Systems-Theoretic Process Analysis (STPA), is shown to be a versatile and powerful tool in this application and by …
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Developing Hybrid Near-Space Technologies For Affordable Access To Suborbital Space
… more expensive, albeit more accurate, ground launch systems. With the increased development of nano-satellites and atmospheric sensors, combined with rising interest in global atmospheric data, there is an increase in desire for affordable access to extreme altitudes that does not necessarily …
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Optimal Engine Selection and Trajectory Optimization using Genetic Algorithms for Conceptual Design Optimization of Resuable Launch Vehicles
Proper engine selection for Reusable Launch Vehicles (RLVs) is a key factor in the design of low cost reusable launch systems for routine access to space. RLVs typically use combinations of different types of engines used in sequence over the duration of the flight. Also, in order to properly …
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Orbit and Attitude Control for (non-) Rotating Space-Based Telescopes Utilizing Reflectivity Control Devices
… may be incompatible with current and proposed launch systems. Mission lifetime limitations due to propellant is of particular concern for satellites operating in unstable orbits such as the Sun-Earth Lagrange points. Therefore, there exists a need for novel methods that allow space telescopes …