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 175 for “"propulsion systems"”.
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Environmental Impacts of Future Aviation Propulsion Systems
… the means of mitigating them with a focus on the propulsion system. Specifically, this thesis addresses aspects of 1) aerosol formation from aviation-attributable NOx and SOx, 2) the technical extent to which the air quality and climate impacts of aviation can be minimized, and 3) how propulsion …
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Hybrid Chemical-Electric Propulsion Systems for CubeSats
… navigation, or science, miniaturized propulsion systems have been actively developed and demonstrated in-flight to support these applications. Propulsion systems are primarily divided into two main categories. Chemical propulsion systems benefit from high thrust to perform impulsive …
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Materials for small-scale space propulsion systems
… creating emitter arrays for the ion electrospray propulsion system (iEPS), a compact, efficient, and scalable space propulsion system for use in a wide range of space missions. The increasing utilization of small, cheap, easy-to-launch satellites known as CubeSats has spurred demand for a …
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Development of Safety Standards for CubeSat Propulsion Systems
… community has begun to develop and implement propulsion systems. This movement represents a new capability which may satisfy mission needs such as orbital and constellation maintenance, formation flight, de-orbit, and even interplanetary travel. With the freedom and capability granted by …
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Assessment of propfan propulsion systems for reduced environmental impact
… burn, reduced emissions and noise. Alternative propulsion concepts include counter-rotating propfans (CRPs) which have been investigated intensively in the 1970s and 1980s and demonstrated significant reductions in fuel burn. Currently, propfans are being studied again due to their inherent …
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Novel turbomachinery concepts for highly integrated airframe/propulsion systems
… flight missions requiring integrated airframe/propulsion systems. The first concept is motivated by thermal management challenges in low-to-high Mach number (4+) aircraft. The idea of compressor cooling combines the compressor and heat exchanger function to stretch turbopropulsion system …
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Testing new potential fuels for ion electrospray propulsion systems
Electrospray thrusters are a class of electric propulsion that extract and accelerate ions from the surface of an electrically conductive liquid surface. This liquid surface is that of an ionic liquid, a room temperature molten salt, applied to a porous substrate. The substrate is etched via laser …
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A study of fish type motion and propulsion systems
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1964
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Acoustically optimized propulsion systems using a Cause-Effect Controller
… and all possible configurations for the vessel's propulsion and control systems, a finite number of unique states can be created. The ARCP uses hardware and software together with a CEC to learn the cause-and-effect relationship between the finite states of the ship and the resulting acoustic …
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Optimized power converters for electrically augmented on-orbit propulsion systems
… to operate electrically augmented on-orbit propulsion systems. The power on board satellites is greatly limited by the solar panels that collect energy and the batteries that store the energy. In addition, satellites are constantly using power to operated their mission equipment and handle …
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Performance mechanisms and integration of high-lift distributed propulsion systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Characterization on a magnetically levitated testbed for electrospray propulsion systems
… community is increasing at a very fast rate. Propulsion systems for these class of spacecraft are very limited. One promising technology is the ion Electrospray Propulsion System (iEPS) developed at the Space Propulsion Laboratory at MIT. Electrosprays accelerate ions present in the interface …
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Optimization of Hypersonic Airbreathing Propulsion Systems through Mixed Analysis Methods
… one-dimensional models of hypersonic propulsion systems are used in tandem with Sandia Labs' Dakota optimization toolbox with the goal of accelerating the design and prototyping process. Simulations were created for the various components of the propulsion system and tied together to …
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Modeling and simulation of a CubeSat with dual electric propulsion systems
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01
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Trade-Space Analysis of Liquid Hydrogen Propulsion Systems for Electrified Aircraft
… of turbo-, hybrid-, and fully-electric aircraft propulsion systems to enable more efficient air transport. A modular optimization framework was developed to quantify system performance for single-aisle transport aircraft with a mission similar to a Boeing 737 MAX 8. Various propulsion systems …
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The effects of aero-propulsive coupling on aircraft with distributed propulsion systems
… for aircraft equipped with distributed electric propulsion (DEP) systems consisting of over-wing trailing-edge mounted (OWTE) arrays of ducted fans, and to identify the influence of those effects on aircraft dynamics. The first experiment consisted of low-speed wind-tunnel testing of an NACA …
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Brushless doubly-fed reluctance machine drive for turbo-electric distributed propulsion systems
Turbo-electric distributed propulsion systems are considered to be a critical enabler for low-carbon emission in the aircraft industry. A brushless doubly-fed reluctance machine (BDFRM) is an attractive option to drive the distributed propeller fans for these megawatt-scale turbo-electric …
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