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 19 of 19 for “"electric propulsion system"”.
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A submarine electric propulsion system with large hub propeller
… Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Aero-propulsive characteristics of an overwing distributed electric propulsion system with vectored thrust
… on a quasi-2D S8036 airfoil with a distributed electric propulsion (DEP) system. An overwing ducted fan system was tested with varied thrust angles achieved by deflecting the fan exit flow direction. The DEP system was comprised of five electric fans mounted on the upper surface of the airfoil …
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Utilizing an ExB probe for obtaining ion velocity distribution function for an electric propulsion system
Electric propulsion (EP) has been a key technology for contemporary and future space missions owing to its superior specific impulse and propellant efficiency relative to chemical propulsion. As EP applications expand from commercial constellations to deep-space exploration, the transition toward …
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Design and comparison of two brushless DC drives for an electric propulsion system of solar-power unmanned aerial vehicles
The electrical propulsion system as the core component of solar-power Unmanned Aerial Vehicles (UAVs) for long duration flight requires high power density and stable drive technology. Brushless DC motors (BLDCM) with high power and torque density and control algorithms suitable for drive system are …
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In-Flight control simulation of a proposed, future microsatellite for the African Resource Management Constellation (ARMC)
… learn to control and build their own satellite systems. The University of Cape Town has been sponsored by a European consortium of academic and industry partners and has received a satellite testbench. The satellite testbench is a fully functional digital twin of the “Flying Laptop” satellite. …
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Nuclear electric propulsion : assessing the design of Project Prometheus.
The high fuel efficiency of electric propulsion makes it a viable alternative for long-distance space travel. Project Prometheus was a NASA-led project that sought to demonstrate that distant electric propulsion missions were achievable by planning an expedition to characterize the Jovian moons of …
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Trade-Space Analysis of Liquid Hydrogen Propulsion Systems for Electrified Aircraft
… the feasibility 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 …
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Design of low-thrust missions to asteroids with analysis of the missed-thrust problem
<p>Small bodies in the Solar System, such as asteroids and dwarf planets, are ideal targets for electric propulsion missions because of the high delta-V required to rendezvous with these targets. We study trajectories to the asteroid belt, including a human mission to Ceres and a sample return …
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Progress in colloid propulsion
… the development of the Colloid Thruster as an electric propulsion system for spacecraft. In spite of the effort by the end of the 70s the programs were stopped in the USA and Europe before any design had gotten to fly in space. An exhaustive study of the literature has been performed to …
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Modeling and Test of the Efficiency of Electronic Speed Controllers for Brushless DC Motors
<p>Small electric uninhabited aerial vehicles (UAV) represent a rapidly expanding market requiring optimization in both efficiency and weight; efficiency is critical during cruise or loiter where the vehicle operates at part power for up to 99% of the mission time. Of the four components (battery, …
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Computational and experimental analysis of HIIPER MPD propulsion system
… Electrostatic Rocket (HIIPER) is a deep space electric propulsion system developed on the principles of inertial electrostatic confinement (IEC) fusion and helicon plasma injection. It is a stepping stone towards a variable impulse pulsed fusion rocket. HIIPER involves a three-stage mechanism …
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State of the Art of Piloted Electric Airplanes, NASA's Centennial Challenge Data and Fundamental Design Implications
… study was to determine the current state of the electric airplane as primarily defined by results from NASA's Green Flight Challenge Competition. New equations must be derived in order to determine the endurance and range for electric airplanes since the standard equations depend upon weight …
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Microthrusters based on the T5 and T6 hollow cathodes
… also be beneficial in the development of all-electric spacecraft whereby the normally separate reaction control system and primary electric propulsion system were able to operate from a common propellant management system.<br/><br/>In recent years experiments on a T6 hollow cathode have …
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Electrospray Thrusters in Chemical-Electric Multimode Propulsion for Small Satellites
Propulsion for small spacecraft is typically one of two modes, chemical or electric. These modes offer complementary propulsive performance: chemical propulsion provides high thrust and low specific impulse, while electric propulsion provides the inverse. As such, having access to both modes on the …
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Supersonic Constricted Plasma Flows
… electrothermal microthruster is a miniaturised electric propulsion system designed for nanosatellites operating in space. A weakly ionised capacitively coupled plasma is ignited in the flowing Ar gas propellant within a constricted discharge chamber at 1 Torr using less than 10 W of …
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Supersonic Constricted Plasma Flows
… electrothermal microthruster is a miniaturised electric propulsion system designed for nanosatellites operating in space. A weakly ionised capacitively coupled plasma is ignited in the flowing Ar gas propellant within a constricted discharge chamber at 1 Torr using less than 10 W of …
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Fracture analysis in marine batteries by peridynamic theory
Hybrid propulsion system (HPS) has become popular in marine industry due to increasingly strict emission control standards. Hence, as one component in the system, marine batteries become attractive in marine design. Solid Oxide Fuel Cells (SOFCs) and lithium ion battery are the most promising …
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Deep-Space Exploration Enabled by CubeSats with Staged Electrospray Propulsion
… as companions to enhance large missions or using propulsion to reach science orbits near the destination of the primary mission (e.g. to Mars or around the Moon). More CubeSat companions are planned on future high-profile missions and the concept is likely to continue to gain popularity, but is …
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Management and control of energy storage systems for stationary and automotive applications
… a number of scenarios in which Energy Storage Systems (ESSs) can be usefully employed for increasing energy system performances. Particularly, after introducing the State-of-the-Art of ESS technologies (Chapter 1), reference has been made to some stationary and automotive applications. …