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 41 for “"Turbine-generator"”.
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A microfabricated ElectroQuasiStatic induction turbine-generator
… any scale reported in the open literature. The generator comprises 5 silicon layers, fusion bonded together, and annealed at 700⁰C. The turbine rotor, 4 mm in diameter, is supported on gas bearings. The thrust bearings are formed by a shallow etch of 1.5 [mu]m to define the thrust bearing gap. …
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Dynamic Analysis Of Turbine-generator-foundation Systems
… investigation on the dynamic characteristics of turbine-generator-foundation systems is performed. All the major components of the system, including turbine-generator casing, shaft, rotors, journal bearings, deck, piers, foundation mat, piles, and soil medium, have been included. Full interaction …
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Tolerable Settlements of Powerplants and Turbine-Generator Bases
Made available in DSpace on 2014-12-08T23:56:56Z (GMT). No. of bitstreams: 1 6801846.pdf: 6643008 bytes, checksum: 905c13d57df5fee800eb372e4faab372 (MD5) Previous issue date: 1967
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A fully-integrated multi-watt permanent-magnet turbine generator
… testing of a fully-integrated permanent-magnet turbine generator based on silicon MEMS technology envisioned to replace batteries. The air-driven device, supported on gas bearings, has been experimentally shown to deliver 19 mW to matched resistive loads of 0.33 [omega] while operating at a …
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IMPACT OF HVDC INVERTER STATION FAULTS ON TURBINE-GENERATOR SHAFT TORSIONAL TORQUES
The phenomenon of the interaction between turbine-generator shaft systems and the electrical network disturbances has been extensively investigated during the last two decades. Those investigations have shown that some of these disturbances can inflict severe torsional stressing on the shafts of …
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A market and engineering study of a 3-kilowatt class gas turbine generator
… only commercially available 3 kW class gas turbine generator, the IHI Aerospace Dynajet. The objectives of the market study were to determine the competitive requirements for small generators in various U.S. applications, assess the unit's current suitability for these applications, and …
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Analysis, design, and fabrication of an electric induction micromotor for a micro gas-turbine generator
This thesis presents the analysis, design, fabrication, and testing of the first axial-gap electric induction micromotor, and the first controlled measurement of electric micromotor torque using integrated mechanical springs. Electric induction micromotors offer several advantages over electric …
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Machine learning techniques for the health monitoring of rotating machinery in nuclear power plants
… of a pre-existing knowledge-based system for turbine generator vibration alarm analysis, and the development of a machine learning model for the exploration of long-term predictive measures of asset health for AGR gas circulator units. Both of these topics are unified in their engineering …
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Reliability-based nuclear power plant maintenance resource allocation in order to reduce unfavorable operational publicity
… been reported in Boston newspapers. Failures of turbine-generator systems and nuclear steam supply systems reduced plant reliability, while failures of safety-related systems did not. Risk analysis with fault tree modeling was carried out to quantify risk of major components in turbine-generator …
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Performance limits of axial turbomachine stages
… of stage efficiency for axial compressor and turbine stages. A stage model is developed, consisting of a specified geometry and a surface velocity distribution with turbulent boundary layers. The assumptions and parameterization of the stage geometry allow for calculation of the magnitude of …
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Energy Management Control for Multimode Microgrid Renewable Integration
… and electric power industry. The wind turbine generator, photovoltaic (PV) and the energy storage unit modeled in this work share a symbiotic relationship even though they are completely separate entities which can be connected at separate locations. This study contributes better …
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Development of a microfabricated turbine-driven air bearing rig
… to develop the technology for a micro gas turbine generator that is capable of converting chemical energy from fuel into electrical power. Such a MEMS device would represent a big leap in portable power source technology, providing ten times the power and energy density of batteries at …
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Creep characterization of single crystal silicon in support of the MIT Micro-Engine Project
… technology to design and manufacture a micro-gas turbine generator. The objective of the research is to demonstrate a full-scale, functional micro-gas turbine generator by the year 2000. To meet this milestone, the first engine to test will be constructed of single-crystal silicon. Due to its low …
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Type-C wind turbine model order reduction and parameter identification
… it useful to have models to investigate wind turbine performance. For different applications, an accurate modeling of aerodynamics, power electronics, electrical transients, or control systems are necessary. In other scenarios, these models may be unavailable or needlessly complex. Through use …
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Small-Signal Modeling and Stability Specification of a Hybrid Propulsion System for Aircrafts
… stability. This thesis presents models of a generator, motor, housekeeping loads, and battery all with power electronics interface which form an onboard electrical system and analyzes the relationship between the impedance shape of each component and their physical design and control loop …
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Acoustic and thermal packaging of small gas turbines for portable power
… of studies have focused on portable small gas turbines. This research is concerned with gas turbine generator units in the 1 kW range. The compact and small-scale architecture of the portable gas turbine engine poses major challenges in the acoustic treatment that is required to attenuate the …
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An appraisal of wind energy conversion systems for agricultural enterprises.
… wind regimes and energy outputs from wind turbine generators at locations that are remote from sites where long-term wind data is available. The model accounts for the local, directional influences on the wind flow of topography and surface characteristics. The model for the validation runs …
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Hardware model of a shipboard generator
A hardware model of the Gas Turbine Generator (GTG) in use on the US Navy's DDG-51 Class Destroyer is constructed for use as a lab apparatus at the Massachusetts Institute of Technology's Laboratory for Electromagnetic and Electronic Systems (LEES). The components of the hardware model include a 5 …
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Development of a MEMS turbocharger and gas turbine engine
… has driven the development of the MIT micro gas turbine generator concept. The first engine design measures 23 x 23 x 0.3 mm and is fabricated from single crystal silicon using MEMS micro-fabrication techniques so as to offer the promise of low cost in large production. This thesis describes the …
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Silicon carbide process development for microengine applications : residual stress control and microfabrication
… MIT microengine (silicon MEMS-based micro-gas turbine generator) require the turbine and compressor spool to rotate at a very high speed at elevated temperatures (1300 to 1700 K). However, the thermal softening of silicon (Si) at temperatures above 900 K limits the highest achievable operating …
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