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 130 for “"Space Systems"”.
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Kinematic morphology of space systems
… the robustness to faults of mechanical kinematic systems typical of the type applied to the locomotion sub-systems of planetary exploration vehicles. It is argued that, whereas the electronic, software and control methodologies for such kinematic systems have received extensive attention, the …
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Macro-scale space systems for geoengineering
… resources of Earth. This thesis sets out several space-based scenarios that can be implemented to reduce these pressures, namely space-based geoengineering to offset the effect of a warming climate and the use of orbiting reflectors to reduce the challenges of human exploration of the Moon. …
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Value-informed space systems design and acquisition
Investments in space systems are substantial, indivisible, and irreversible, characteristics that make them high-risk, especially when coupled with an uncertain demand environment. Traditional approaches to system design and acquisition, derived from a performance- or cost-centric mindset, …
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Limiting controls in vector state space systems
This thesis concerns the control of networked systems under actuation constraints. Focusing mostly on linear vector state space systems, we investigate how limits on the frequency of system actuation affect control policies. Two types of actuation constraints are considered. The first places a …
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Cost optimization in requirements management for space systems
When producing complex space systems, the transformation of customer needs into a realized system includes the development of product requirements. The ability to generate and manage the requirements can either enable the overall system development or drive significant cost and schedule impacts. …
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Structural Scaling Metrics For Tensioned-Blanket Space Systems
… comparing the mass performance of aircraft and spacecraft platforms. Large space structures designers and evaluators rely on metrics to compare boom, telescope, and long antenna architectures. In this work, scaling metrics are established for rectangular flexible blanket solar array structural …
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Risk management strategies for developing complex space systems
Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2001.
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Advanced methods of life cycle assessment for space systems
… is increasingly being applied within the space industry to scientifically quantify environmental impacts of space missions over their entire life cycle. This technique is particularly useful in early mission design phases since adverse life cycle impacts are more difficult to modify the …
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Supporting Space Systems Design via Systems Dependency Analysis Methodology
<p>The increasing size and complexity of space systems and space missions pose severe challenges to space systems engineers. When complex systems and Systems-of-Systems are involved, the behavior of the whole entity is not only due to that of the individual systems involved but also to the …
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An Examination of Soviet and Russian Military Space Systems
The USSR, the world's largest spacefarer, launched the first object into space, the first man, the first woman and the first anti-satellite weapon. The USSR launched thousands of vehicles during its existence and maintained the longest orbiting space station. The Russian Federation, the largest …
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Reconfigurability in space systems : architecting framework and case studies
Reconfigurability in engineered systems is of increasing interest particularly in Aerospace Systems since it allows for resource efficiency, evolvability, and enhanced survivability. Although it is often regarded as a desirable quality for a system, it has traditionally been difficult to …
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Measuring space systems flexibility : a comprehensive six-element framework
Space systems are extremely delicate and costly engineering artifacts that take a long time to design, manufacture, and launch into space and after they are launched, there is limited access to them. Millions of dollars of space systems assets lost annually, when the space system has failed to meet …
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Comparative system architecture for large, government-sponsored space systems
… architecture factors. In large government-funded space system architectures, which often span years of development/production and cost tens of billions of dollars, this difficulty is especially apparent and highlights the need for an effective method for comparative evaluation. This thesis …
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Space Systems Conceptual Design. Analysis methods for engineering-team support.
… the framework of designing methods for complex systems focused on the conceptual design phase of the systems’ life-cycle. More specifically, the methods presented here belong to the category of Operational Research methods. They aim at the creation of design and analysis tools in support of the …
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A framework for space systems architecting under stakeholder objectives ambiguity
… is one of the primary challenges of the aerospace industry, on par with the technical challenges of developing new technology. The challenge is further complicated in space exploration, by its own nature aimed at exploring the unknown. Stakeholder objectives are often unclear due to business …
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Managing uncertainty in space systems conceptual design using portfolio theory
… in conceptual design is managing the tradespace of potential architectures-choosing which design to pursue aggressively, which to keep on the table and which to leave behind. This thesis provides a framework for managing a tradespace of architectures not through traditional effectiveness …
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Tiv-Model : an empirically validated design methodology for complex space systems
In response to emergent space systems engineering industry challenges, this thesis explored work on the following; 1. The development of engineering design methodologies, following a design process and proposing a baseline of requirements for new methodologies called the “Methodology Requirements …
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A flight software development and simulation framework for advanced space systems
Distributed terrestrial computer systems employ middleware software to provide communications abstractions and reduce software interface complexity. Embedded applications are adopting the same approaches, but must make provisions to ensure that hard real-time temporal performance can be maintained. …
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Characterization of operator-reported discrepancies in unmanned on-orbit space systems
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
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