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 71 for “"aerospace systems"”.
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Hybrid Control For Aerospace Systems
Hybrid dynamical systems are dynamical systems in which continuous and discrete evolutions coexist and interact. Their twofold nature makes them particularly powerful for both describing and synthesizing complex dynamical behaviors. In this work we exploit this capability for designing innovative …
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Adaptive Augmentation of Non-Minimum Phase Flexible Aerospace Systems
… system as an analogue of a large flexible aerospace structure such as a launch vehicle or aircraft. To that end, a robot was constructed as a control system testbed. This robot, named “Penny,” contains the command and data acquisition capabilities necessary to influence and record system …
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Unified modelling of aerospace systems: a bond graph approach
Systems Integration is widely accepted as the basis for improving the efficiency and performance of many engineering products. The aim is to build a unified optimised system not a collection of subsystems that are combined in some ad hoc manner. This moves traditional design boundaries and, in so …
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Cultivating Creativity in Aerospace Systems Engineering to Manage Complexity
<p>In recent decades, complexity in aerospace programs has been increasing, leading to large budget and schedule overruns. Many of the risks of complex system development can be attributed to the inadequacy of linear methods when applied to nonlinear domains, i.e., oversimplification in a program …
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Robust decision-making with model uncertainty in aerospace systems
Actual performance of sequential decision-making problems can be extremely sensitive to errors in the models, and this research addressed the role of robustness in coping with this uncertainty. The first part of this thesis presents a computationally efficient sampling methodology, Dirichlet Sigma …
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Development of Fault Tolerant Adaptive Control Laws for Aerospace Systems
… designed to maintain healthy performance of aerospace systems subjected to malfunctions, external parameter changes and/or unmodeled dynamics. The dissertation is focused on the development of novel adaptive control configurations that rely on non-linear functions that appear in the immune …
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Development of optical sensors and diagnostics algorithms for aerospace systems
L'abstract è presente nell'allegato / the abstract is in the attachment
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The utilization and loss of available energy in aerospace systems
… volume-based energy availability methodology for aerospace vehicles are developed; applications are made to jet-propelled and rocket-propelled vehicles as well as to stand-alone engine systems. Energy availability utilization characteristics of a modeled turbojet engine are studied across a wide …
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Acquisition strategies for commonality across complex aerospace systems-of-systems
… through reuse of existing components and systems, and forward-thinking investment in future commonality opportunities is unlikely. New strategies which involve less emphasis on competition between contractors in favor of greater continuity with experienced contractors are recommended to …
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A framework for the architecting of aerospace systems portfolios with commonality
… of future and legacy exploration life support systems, for the historical Saturn launch vehicle portfolio, and for a portfolio of future lunar and Mars surface pressurized mobility systems. The case studies demonstrate the broad applicability of the methodology and provide insights into the …
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Knowledge integration for problem solving in the development of complex aerospace systems
… integration in the development of complex systems in a large-scale organizational context is proposed in this thesis using an extensive review of the pertinent literature. The framework consists of the main channels, strategies, practices and mechanisms most commonly used to transfer, share …
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Design for affordability in defense and aerospace systems using tradespace-based methods
Program failures have plagued the defense and aerospace industry for decades, as unanticipated cost and schedule overruns have rendered the development of systems ineffective in terms of time and cost considerations. This raises the need to holistically include performance, cost and schedule …
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Nonlinear Estimation and Control Methods for Mechanical and Aerospace Systems under Actuator Uncertainty
… field control is of crucial importance in aerospace applications to prevent the potentially destabilizing effects of phenomena such as cavity ow oscillations, flow separation, flow-induced limit cycle oscillations (LCO) (flutter), vorticity, and acoustic instabilities. Flow control is also …
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Utilizing Multiple Attribute Tradespace Exploration with Concurrent Design for creating aerospace systems requirements
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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Modeling the Transient Effects of High Energy Subsystems on High-Performance Aerospace Systems
… transients quickly heat downstream onboard systems. Real-time heat rejection causes temperature spikes in avionic and environment systems that exceed allowable operation constraints. The addition of thermal storage to the thermal management system mitigates thermal impacts downstream of the …
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Compact and efficient power electronics with applications to solar PV, automotive, and aerospace systems
… of a power converter has many benefits for systems integration. Aspects such as thermal management, weight, conformation to mounting locations, and the footprint of the converter all become critical factors as systems continue to scale down in size. The flying-capacitor multilevel (FCML) …
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Service bulletin inventory management and modeling for aerospace parts in customer service organization
… of United Technology Corporation (UTC) Aerospace System is primarily responsible for providing spare parts, repair services, training, and technical support for products that UTC Aerospace Systems develops. The goal for spares turn-around time is a 7-day or less and for repair …
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Information inference for cyber-physical systems with application to aviation safety and space situational awareness
… on sensors and processors, engineering systems have become more complex and highly automated to meet ever stringent performance and safety requirements. These systems are usually composed of physical plants (e.g., aircraft, spacecraft, ground vehicles, etc.) and cyber components (e.g., …
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