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 62 for “"launch vehicles"”.
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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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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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Developing a component reuse strategy for space launch vehicles
Launch vehicle hardware is traditionally very expensive to design, develop, produce and certify, because it must operate in extreme environments with high reliability. The result is that most hardware for NASA-funded launch vehicles is custom built to execute a specific mission on a single …
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Integrated entry guidance and control for autonomous reusable launch vehicles
… control approach employed on current reusable launch vehicles is based on classical control techniques developed for the Space Shuttle more than 20 years ago. This approach partitions the guidance and control tasks into separate loops resulting in a complex control architecture that can be …
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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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Air traffic management and conflict analysis for reusable launch vehicles
… and more economical access to space. Reusable Launch Vehicles (RLVs) are expected to take over a significant portion of the launch markets. Increased utilization of Spaceports will increase the frequency of interruptions to normal airspace operations and new methods of Aircraft-RLV separation …
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Comparative System Analysis of Reusable Rocket and Air-Breathing Launch Vehicles
… and two-stage reusable air-breathing and rocket launch vehicles to identify configurations which improve space access and merit further developmental emphasis. Investigated air-breathing configurations included both two-dimensional and inward-turning inlet geometries and horizontal and vertical …
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Onboard trajectory generation for the unpowered landing of autonomous Reusable Launch Vehicles
… the pre-defined trajectories used. in Reusable Launch Vehicle (RLV) guidance since the early days of the Shuttle era. This shift, enabled by a new breed of algorithms harnessing modern computer power, offers improvements in performance, robustness, operational cost, and safety. This thesis …
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An optimal design methodology for a class of air-breathing launch vehicles
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1980.
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Application of Novel Additive Manufacturing Techniques for Cost Reduction in Space Launch Vehicles
… (NPV) to large aluminum structures in the space launch industry. Supply chain implications from vertical integration and increased sourcing options have the potential to drive additional value. In this paper, we propose an analysis framework and apply it to one application but anticipate other …
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Development and Validation of an Aeroelastic Ground Wind Loads Analysis Tool for Launch Vehicles
… of and to estimate static and dynamic launch vehicle responses to ground wind loads (GWL). The motivation of this study was to estimate the magnitude of response of the Ares I-X launch vehicle to ground winds and wind-induced oscillation (WIO) during roll-out and on the pad. This method …
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Developing Evaluation Measures for the Second Stage Next Generation Engine on Evolved Expendable Launch Vehicles
… provides a history of the Evolved Expendable Launch Vehicle (EELV), U.S. liquid propulsion, and the RL10 LH2/LOX engine to analyze tradeoffs between major requirements in new upper stage development and to provide a recommendation of evaluation measures. The results are a proactive case …
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Coupling of Fluid & Solid Thermal Models to Correct Heat Flux Measurements Taken on Launch Vehicles
… design of thermal protection systems (TPS) for launch vehicles. These loads are measured via the cylindrical heat flux gauges that are flush mounted with the outer surface of a launch vehicle and are exposed to the in-flight external thermal and velocity boundary layers as well as thermal …
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New methodologies for onboard generation of Terminal Area Energy Management trajectories for autonomous reusable launch vehicles
… greatly increases an autonomous reusable launch vehicle's capacity for recovering from unexpected disturbances or anomalous conditions. Such capability dispenses with the routine of pre-defined, mission specific trajectories and contingencies, which has been in use since the early days of …
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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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Redefining “Space Sustainability” for Launch Vehicles: Forecasting the Atmospheric Impact of the Commercial Space Launch Industry in 2050
… centered on orbital debris, the burnup of vehicles during atmospheric reentry, and the resulting emissions. However, 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 …
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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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Hybrid Rocket Motor Scaling Process
… 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 for use in sounding …
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Parametrization of Triple Screw Pumps for Aerospace Applications
… offer steady, high-pressure flow. In very small launch vehicles or upper stages turbopumps are not practical. This paper examines the performance of triple screw pumps to determine if they may serve as an alternative to turbopumps for use in small launch vehicles or upper stages. To this end, the …
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