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 16 of 16 for “"Mission concept"”.
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An Investigation of General Criteria for Assessing Space Flight Systems of Diverse Mission Concept Designs
… risk factors of proposed space science missions at the mission concept stage. According to the National Aeronautics and Space Administration (NASA) Space Flight Program and Project Management Handbook (NASA, 2012), the mission concept review objectives are “To evaluate the feasibility of …
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Quantification of the spatial structure and temporal variability of Earth's exosphere using optical tomography
… Imaging Neutral-atom Spectrometers (TWINS) mission have obtained routine measurements of solar Lyman-Alpha (Ly-a) photons at 121.56 nm that are resonantly scattered by exospheric H atoms. This thesis presents a new means of global, three-dimensional quantification of exospheric H density …
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AeroSandbox: A Differentiable Framework for Aircraft Design Optimization
… work presents a new computational framework for conceptual aircraft design called AeroSandbox. This framework leverages modern techniques for automatic differentiation developed in the optimal control and machine learning communities. By combining these efficient gradient calculations with robust …
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System of Systems conceptual design methodology for space exploration
… to interact and cooperate in order to complete a mission), based on models, methods and tools, to support the decision makers during the space exploration scenarios design and evaluation activity in line with the concurrent design philosophy. Considering all combinations of system parameters (such …
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On-Orbit Cryogenic Propellant Storage Optimization
… Storage (CPS) system enables human exploration missions by reducing launch vehicle mass to orbit requirements and providing an extensible approach for human spaceflight missions to near-Earth asteroids, the moon, and Mars. The optimal CPS sun-shield design and attitude control approach …
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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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Propulsive and logistical feasibility of alternative future human-robotic Mars exploration architectures
… extends the work on a shared human and robotic mission to the Martian system presented at the Revolutionary Aerospace Systems Concepts Academic Linkage (RASC-AL) 2010 competition by a team of MIT graduate students. Particular attention is paid to the transportation infrastructure and its ability …
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Understanding the Development and Implementation of Heuristics and Biases in Design
… with participants ranging from space mission concept design, advanced manufacturing, and graduate student design teams. A framework for documenting and updating heuristic knowledge over time is formed based on statistically significant correlations of heuristic attributes, specifically …
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Uranus orbiter and probe mission : Project Upsilon
… NASA Flagship Class, Uranus Orbiter and Probe mission concept to investigate Uranus' planetary magnetic field and atmosphere. Three spacecraft - the Upsilon-0 Propulsion Module, the Upsilon-1 Science Orbiter, and the Upsilon-2 Atmosphere Probe - shall be implemented to meet needs, goals, and …
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Conceptual design of HADES a CubeSat conducting radio astronomy in lunar orbit
The “HI Absorption in the Dark agES” (HADES) mission proposes a novel CubeSat architecture to address one of the most significant challenges in modern cosmology: the detection of the redshifted 21 cm neutral hydrogen signal from the Cosmic Dawn and Epoch of Reionization. Observations in the 1 to …
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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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Evaluation of multi-vehicle architectures for the exploration of planetary bodies in the Solar System
Planetary exploration missions are becoming increasingly complex and expensive due to ever more ambitious scientific and technical goals. On the other hand, budgets in planetary science have suffered from dramatic cuts over the past decade and projections estimate a flat budget of approximately …
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Solar Sailing Adaptive Control Around the Earth-Moon Lagrange Point L4 for Stellar Observations
… points and solar radiation pressure. To assess mission feasibility, the spacecraft's trajectory is initially designed using low-thrust propulsion in a nonlinear optimal control problem.</p> <p>We further transition solar sailing periodic orbits to a higher-fidelity ephemeris model to account for …
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Molecular-Level Understanding of Electrochemical Reaction Mechanisms and Electrode Interphases in Metal-CFx Batteries
… medical devices, marine, military, and aerospace missions. Notably, Li/CF<sub>x</sub> batteries are lead candidates for space exploration and planetary science, such as the Europa lander mission concept, owing to their high gravimetric energy density (2180 Wh kg⁻¹) and low self-discharge rates. …
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FRAMEWORK FOR CUBESATS MISSION MANAGEMENT, DESIGN, AND OPTIMIZATION
… for the design and management of CubeSat missions. In recent years, CubeSats have moved from their original intent of educational nanosatellites to platforms that can deliver high scientific and commercial value. This mission performance improvement comes with a rise in their complexity. …
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Novel probabilistic and distributed algorithms for guidance, control, and nonlinear estimation of large-scale multi-agent systems
… simulation based on an Asteroid Redirect Mission concept. The new algorithms proposed in this dissertation will facilitate the development of versatile autonomous multi-agent systems that are capable of performing a variety of complex tasks in a robust and scalable manner.