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 9 of 9 for “"Lunar gravity"”.
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Lunar Surface Navigation Using Gravity and Star Tracker Measurements
… and analyzes a method that uses measured gravity and starlight vectors to provide position and attitude estimates, given a predefined high-fidelity lunar gravity field. The gravity field uses provided values for the surface gravity magnitude and the East-West (EW) and North-South (NS) …
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THERMOSYPHON FLOODING IN REDUCED GRAVITY ENVIRONMENTS
… parabolic flight campaign to achieve the Reduced Gravity Environments (RGE) needed to obtain empirical data for analysis. Current correlation models of Faghri and Tien and Chung do not agree with the data. A new model is presented that predicts the flooding limits for thermosyphons in earth’s …
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The Collisional Evolution of Orbital Debris in Geopotential Wells and Disposal Orbits
… including the geopotential, solar and lunar gravity, and solar radiation pressure forces. This thesis is based on a prior paper and additionally seeks to address an issue in simulating East-West trapped objects. The results show that this propagator successfully simulates the presence …
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Geophysical insights into the histories of Venus, Mercury and the Moon
Gravity and topography data provide a powerful tool for studying the interiors of rocky planetary bodies. In this thesis I study three such bodies - Venus, Mercury and the Moon - and I use the gravity and topography data returned by recent NASA planetary science missions to model their structure …
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The geophysical evolution of impact basins and volcanic structures on Mercury and the Moon
… parameters of the impact and the rheology of the lunar mantle; and that the tremendous sizes at which lunar lava tubes can be stable open up both new ways of interpreting GRAIL observations of the lunar gravity field and new possibilities for human exploration of the Moon.</p>
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Spacecraft Orbit Design in the Circular Restricted Three-Body Problem Using Higher-Dimensional Poincaré Maps
… of a high-altitude Earth orbit perturbed by lunar gravity are correlated with the shape and evolution of the surface of a deformed torus on a four-dimensional map.</p>
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Conceptual design of HADES a CubeSat conducting radio astronomy in lunar orbit
… This thesis evaluates the feasibility of a lunar-orbiting 12U CubeSat designed to leverage the Moon’s far side as a natural shield against terrestrial and solar noise, targeting the detection of the global spectral distortion in the cosmic microwave background. A comprehensive high-fidelity …
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Lunar Mission Analysis for a Wallops Flight Facility Launch
… This thesis explores the mechanics behind a lunar mission and the costs and benefits of different approaches. To constrain this problem, the launch criteria are those of Wallops Flight Facility (WFF), which has expressed interest in launching small spacecraft to the Moon for exploration and …
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MULTI-PHYSICS DESIGN AND ANALYSES OF LONG LIFE REACTORS FOR LUNAR OUTPOSTS
… operate steadily throughout the long ~27.3 day lunar rotational period, irrespective of location. Nuclear power systems can potentially open up the entire lunar surface for future exploration and development. Desirable features of nuclear power systems for the lunar surface include passive …