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 1134 for “"propulsion"”.
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Advanced propulsion for microsatellites
… microsatellite missions require considerable propulsion capabilities, miniaturization of the propulsion subsystem is critical in the design of most miniature spacecraft. A broad range of existing propulsion technologies have been considered for the purpose of identifying those devices which …
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Experiments in electroaerodynamic propulsion
Electroaerodynamic (EAD) propulsion, which produces a thrust force by electrokinetic acceleration of ions in air, is a proposed method of electric airplane propulsion that is solid-state, nearly silent, and produces no direct combustion emissions Recent work suggested that EAD-propelled aircraft …
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Progress in colloid propulsion
… 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 identify what …
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Vorticity control for efficient propulsion
Vorticity control is a new paradigm in propulsion hydrodynamics. In this thesis, we study fish-like propulsion strategies as concepts in vorticity control. Our motivation for this research stems from the remarkable capabilities of fish to propel and maneuver in ways presumably optimized by …
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Spacecraft and Propulsion Technician Error
<p>Commercial aviation and commercial space similarly launch, fly, and land passenger vehicles. Unlike aviation, the U.S. government has not established maintenance policies for commercial space. This study conducted a mixed methods review of 610 U.S. space launches from 1984 through 2011, which …
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Dissociating Gases for Naval Propulsion
Made available in DSpace on 2017-07-06T18:48:21Z (GMT). No. of bitstreams: 3 Hardwidge_Mark_E_MS.pdf: 33038033 bytes, checksum: ea5954bb4ea0377c061e1f68e9a302f6 (MD5) Hardwidge_Mark_E_MS_ABS.pdf: 1190757 bytes, checksum: 769a2af6cf480a4a2dbcad8a4b024fb0 (MD5) license.txt: 4813 bytes, checksum: …
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Vorticity control for efficient propulsion
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Chemical kinetics of SCRAMJET propulsion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Self-propulsion of floating objects
… of interfacial effects is the generation of self-propulsion of floating bodies. We examine means of interfacial propulsion employed by floating bodies. Nature utilizes dynamic and quasistatic phenomena to induce propulsion. However, we show that quasi-static propulsion due to manipulation of the …
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Autonomous Underwater Vehicle Propulsion Design
… an efficient brushless electric motor for the propulsion system. A program developed at MIT, Massachusetts Institute of Technology, called OpenProp versions 1 and 2.3 was utilized to design a custom propeller that maximizes the efficiency of the system. A brushless electric motor was selected …
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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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Spaceborne centrifugal relays for spacecraft propulsion
Acceleration using centrifugal relays is a recently discovered method for the acceleration of spaceborne payloads to high velocity at high thrust. Centrifugal relays are moving rotors which progressively accelerate reaction mass to higher velocities. One important engineering problem consists of …
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Spray ignition enhancement for multifuel propulsion
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Cognitive-motor interaction during wheelchair propulsion
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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Dynamic instabilities imparted by CubeSat propulsion
… CubeSat developers are increasingly integrating propulsion into the design of their CubeSats. In addition, more complex payloads and communication systems require more power generation, which leads to larger deployed solar arrays. Meanwhile, the limiting factor for the CubeSat remains the size …
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Optimization of electric propulsion orbit raising
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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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 characterization of electrohydrodynamic propulsion devices
Partially ionized fluids can gain net momentum under an electric field, as charged particles undergo momentum-transfer collisions with neutral molecules in a phenomenon termed an ionic wind. Electrohydrodynamic thrusters generate thrust by using two or more electrodes to ionize the ambient fluid …
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Propulsion via buoyancy driven boundary layer
… surface forces have never been studied in propulsion applications. We built a triangular wedge to test this effect by mounting a resistive heating pad to one of its conducting sloped surfaces. We submerge the wedge within a two-layer water stratification, turn the heater on and track the …
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