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 33 for “"mission scenarios"”.
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Architecting a family of space tugs based on orbital transfer mission scenarios
… prevent satellites from prematurely ending their missions. It was found to be more realistic to design a tug (or tugs) that service groups of satellites with similar orbital and physical characteristics, rather than to design a "monster" vehicle expected to traverse the huge distances between LEO …
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DEFENSE INSTALLATION ENERGY RESILIENCE FOR CHANGING OPERATIONAL REQUIREMENTS
… to determine the impact of different potential mission scenarios upon energy resilience for mission-critical loads attached to a military base’s microgrid infrastructure. This process applies to any institution with changing operational states whose energy resilience requirements necessitates …
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Optimal Allocation of Satellite Network Resources
… simplifications, such as the limitation of the mission scenarios to Low Earth Orbiting satellites, allows the effective application of the rigorous methods of the Greedy Activity-Selector algorithm. Tools such as Analytical Graphic's Satellite Tool Kit and MATLAB 5.0 are integrated to assist in …
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Astronaut-centric analysis of a jetpack with integrated control-moment gyroscopes for enhanced extravehicular activity performance
… the surface environments encountered on such missions would limit the independent mobility of astronauts, a maneuvering unit that offers counter reaction forces and torques during movements and tasks will likely be required. The next-generation maneuvering and stability system proposed in this …
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Towards Earth independence - tradespace exploration of long-duration crewed Mars surface system architectures
… spaceflight activities. A review of past Mars mission planning efforts, however, reveals that while numerous analyses have studied the challenges of transporting people to the red planet, relatively little analyses have been performed in characterizing the challenges of sustaining humans upon …
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Fine-pointing system development and photometric precision assessment for the transiting exoplanet survey satellite
… Explorer-class planet finder with the primary mission of detecting transiting exoplanets in a 2-year all-sky survey. The TESS instrument consists of four wide-field optical cameras, mounted in a stacked configuration. During science operations, TESS uses the instrument cameras in the loop for …
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A systems engineering process to evaluate and enhance the disaster communication capabilities of the American Red Cross
… engineering tools such as the Life Cycle, mission scenarios, and models.
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Vision-Based Aerial Navigation Using Satellite Offline Maps
… In The Loop (SITL) simulations over varied mission scenarios at Virginia Tech's Kentland Farm demonstrate an R95 accuracy of 4.5 m to 5.5 m, with effective drift bounding even in low-texture environments. Remaining challenges include uncertainty calibration, particularly over tree-covered …
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Use and sizing of rocket hoppers for planetary surface exploration
… mobility for planetary surface exploration missions. Hoppers offer higher exploration versatility than landers, rovers, or other surface exploration systems through their ability to quickly traverse difficult terrain in a variety of planetary environments. Furthermore, using a hover hop …
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Implementation of a Multi-Criteria Decision Analysis (MCDA) Toolkit to Aid in Ranking Naval Mission Vessel Combinations With Uncertainty
… maker (DM) preferences to aid in selection of mission scenarios.</p>
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Mission design and trajectory analysis for inspection of a host spacecraft by a microsatellite
The trajectory analysis and mission design for inspection of a host spacecraft by a microsatellite is motivated by the current developments in designing and building prototypes of a microsatellite inspector vehicle. Two different, mission scenarios are covered in this thesis - a host spacecraft in …
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Evaluation of phase change material thermal control architectures for a WaferSatellite using integrated design and optimization techniques
… system resource constraints. Two reference mission scenarios are explored. First, a minimum mass solution is obtained for a fixed-attitude case. Next, a scenario of varied WaferSat attitudes is shown to reduce the required phase change material mass. Finally, design implications and future …
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Mission design for safe traverse of planetary hoppers
… questions of this research are: - What types of missions will hoppers perform and how does a hopper traverse as part of these missions? - How does a hopper traverse from its current location to a new landing site safely? This thesis: - describes various hopper mission scenarios and considerations …
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Architecture Flow Optimization - Refinement and Application for Naval Ship Concept Design
… across multiple intact and damaged operational scenarios. The total ship system is described by physical and logical architectures in a network structure comprised of vital component nodes and arcs. These elements form the basis of a linear system of equations in matrix form, the manipulation of …
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Robust distributed planning strategies for autonomous multi-agent teams
… vehicles (UAVs) and ground rovers, for complex missions has motivated the development of autonomous task allocation and planning methods that ensure spatial and temporal coordination for teams of cooperating agents. The basic problem can be formulated as a combinatorial optimization …
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Generating Exploration Mission-3 Trajectories to a 9:2 NRHO Using Machine Learning
… platform that provides expanded knowledge of mission availability through a launch season by improving trajectory resolution and introducing launch mission forecasting. The specific scenario addressed in this paper is one in which data is provided for four deterministic translational maneuvers …
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Approximate dynamic programming with applications in multi-agent systems
… theoretical methods that enable an autonomous mission system to manage real-time multi-agent operations. To meet this goal, we begin by discussing aspects of the real-time multi-agent mission problem. Next, we formulate this problem as a Markov Decision Process (MDP) and present a system …
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Rendezvous approach guidance for uncooperative tumbling satellites
… satellite servicing, but is extendable to other mission scenarios. The author tests the algorithm in an RPO simulation with an uncooperative tumbling satellite near Geo-stationary Orbit (GEO) starting at a relative distance of 50 m and ending at a relative distance of 5 m. Examples of potential …
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Autonomous Underwater Vehicle (AUV) Propulsion System Analysis and Optimization
… underwater vehicles (AUV's) that have specific mission scenarios is the propulsive efficiency. The propulsive efficiency affects the amount of power storage required to achieve a specific mission. As the efficiency increases the volume of energy being stored decreases. The decrease in volume …
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Station-keeping and orbital transfers in the vicinity of the Moon exploiting quasi-periodic orbit dynamics
… vicinity of the Moon with robotic exploration missions and crewed space vehicles. Not only is returning to the Moon an inspiring challenge but also and more importantly a return to the Moon opens the possibility to prove new technologies, gain scientific knowledge, and identify key requirements …
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