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 199 for “"Propulsion system"”.
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HAPSS, Hybrid Aircraft Propulsion System Synthesis
<p>Hybrid Aircraft Propulsion System Synthesis (HAPSS) is a computer program that sizes and analyzes pure-series hybrid electric propulsion systems for aircraft. The development of this program began during a NASA SBIR contract, in conjunction with Empirical Systems Aerospace (ESAero), with the …
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Propulsion system concepts for silent aircraft
… to achieve a step change in airframe and propulsion system noise reduction (30 EPNdB). This thesis addresses the assessment of low-noise propulsion system concepts suggested to enable such a functionally-silent aircraft. The propulsion system concepts of ultra-high bypass ratio turbofan …
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Performance of a boundary layer ingesting propulsion system
… of the aerodynamic performance of an aircraft propulsion system, with embedded engines, in the presence of aircraft fuselage boundary layer ingestion (BLI). The emphasis is on defining the role that the turbomachinery (i.e., the fan, in the ultra high bypass engines considered) plays in …
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Robust control of a flexible-hull propulsion system
… is continuing the research done on fish-like propulsion systems with the Vorticity Control Unmanned Underwater Vehicle (VCUUV) project. The VCUUV is a fully autonomous robotic fish, which employs a flexible tail structure for propulsion and maneuvering. This paper describes the design, …
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Considerations for a multi-modal electrospray propulsion system
… of these spacecraft is the lack of suitable propulsion, which has severely limited the scope of prior CubeSat missions. While these spacecraft have gained traction by virtue of their economical size, the same quality has imposed unique propulsion demands which have continued to elude …
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An efficient propulsion system for small underwater vehicles
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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Computational and experimental analysis of HIIPER MPD propulsion system
… 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 for …
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A submarine electric propulsion system with large hub propeller
Thesis (Ocean E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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Autonomous Underwater Vehicle (AUV) Propulsion System Analysis and Optimization
… The process of selecting an efficient propulsive system becomes an iterative process between motor, propeller, and battery storage. Optimized propulsion systems for mission specific AUV's require costly motor and propeller fabrication which may not be available to the designer. Recent advancements …
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Design of electric vehicle propulsion system incorporating flywheel energy storage
… for moving towards a zero emission transport system. Though battery electric vehicle technology has been rapidly improving, it is still not competitive to the conventional vehicles in terms of both cost and performance. The limited driving range and high cost are significant impediments to the …
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Material and fabrication developments in the ion-electrospray propulsion system
… developed in support of the ion electrospray propulsion system (iEPS) developed by MIT's Space Propulsion Lab. MEMS fabrication techniques are reworked to increase yield reliability of the thruster frames. The focus of this work is on propellant management, increasing thrust density, system …
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Sensor Craft Control Using Drone Craft with Coulomb Propulsion System
The Coulomb propulsion system has no exhaust plume impingement problem with neighboring spacecraft and does not contaminate their sensors because it requires essentially no propellant. It is suitable to close formation control on the order of dozens of meters. The Coulomb forces are internal forces …
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Propulsion system characterization for the SPHERES Formation Flight and Docking testbed
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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Design and characterization of Hover Nano Aerial Vehicle (HNAV) propulsion system
… risk of detection. This thesis addresses the propulsion system required to enable the DARPA NAV. In particular, a rotary-wing vehicle is favored because of its high efficiency and simplicity. One large challenge faced for this design is the torque canceling mechanism to counter the torque …
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Development of a cold gas propulsion system for the TALARIS hopper
… lunar and other planetary surfaces. It has two propulsion systems: (1) a system of four electric ducted fans to offset a fraction of Earth's gravity (e.g. 5/6 for lunar simulations), and (2) a cold gas propulsion system which uses compressed nitrogen propellant to provide impulsive rocket …
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Optimal Battery Weight Fraction for Serial Hybrid Propulsion System in Aircraft Design
<p>This thesis focuses on electric propulsion technology associated with serial hybrid power plants most commonly associated with urban air mobility vehicles. While closed form analytical solutions for parallel hybrid aviation cases have been determined, optimized serial hybrid power plants have …
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Design, construction, and testing of a combined magnetic levitation and propulsion system.
Thesis. 1977. B.S.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Design of a Bimodal Chemical-Electrospray Propulsion System using Ionic Liquid Monopropellants
Two primary propulsion modes currently exist for spacecraft: chemical (e.g. monopropellant, cold gas, solid propellant) and electric (e.g. Hall thruster, ion engine, electrospray). Chemical propulsion typically offers high thrust and low specific impulse, while electric propulsion provides the …
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Development, modeling and testing of a slow-burning solid rocket propulsion system
… are expanding the capabilities of aircraft systems. However, a gap exists in the size and capability of aircraft: no aircraft smaller than 10 kilograms are capable of flight faster than 100 meters per second. A small, fast aircraft requires a propulsion system which is both miniature and …
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A Tail-Integrated Boundary-Layer Ingesting Propulsion System for Turbo-Electric Aircraft
… guidelines and results for a tail-integrated propulsion system for turbo-electric aircraft with boundary layer ingestion (BLI). This includes (i) definition of tail BLI electric fans and (ii) integration of the BLI propulsors on an aircraft tail, to meet the propulsive power requirements and …
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