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 102 for “"specific power"”.
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System specific power reduction techniques for wearable navigation technology
… to usability of the device is its excessive power consumption. As such, the goal of this work is, broadly, to- (1) Understand the largest sources of power consumption in the initial navigation proto- type system, and expose relevant features for control; (2) Develop a set of algorithms that …
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Electromagnetic fault analysis for high specific power permanent magnet synchronous machine
… the electromagnetic fault analyses for a high specific power 1 MW permanent magnet synchronous electric machine designed for aerospace applications. As the high specific power of 13.3 kW/kg of the machine is to be achieved by pushing the design parameters such as mechanical speed, electric …
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Design of a High Specific Power Electric Machine for Turboelectric Propulsion
… a gas generator core electrically drives motor-powered propulsors, are limited by the mass and losses of the electric components introduced into the drivetrain. These propulsion systems are predicted to result in a 15\% fuel savings provided that megawatt-class electrical machines (EMs) and …
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System-level optimization of high-specific-power electric machines for aircraft propulsion applications
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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High-frequency, high-pole count design for improving specific power density of electric machines
… high pole count (HFHP) design for improving specific power density of electric machines for weight and/or volume sensitive applications. Although electric machine designs have reached a limit in terms of efficiency, reliability, and cost, newer applications such as in aviation or the oil and …
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Understanding and quantifying motor vehicle emissions with vehicle specific power and TILDAS remote sensing
… operating conditions, a new parameter termed "specific power" (SP) is presented. SP is the instantaneous tractive power per unit vehicle mass. This parameter has three main advantages: it can be calculated from roadside measurements, it captures most of the dependence of light-duty vehicle …
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Electro-thermal design and optimization of high-specific-power slotless PM machine for aircraft applications
The student, Xuan Yi, submitted this Dissertation for approval on 2020-07-07 at 07:38.
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Insulation considerations and qualifications for form-wound air-core armature windings in high-frequency electrical machines
High specific power electrical machines are a key enabling technology in hybrid electric aircraft. Specific power can be increased by increasing the machine's electrical loading and operating frequency, which often increases the machine's operating temperature and requires a strong insulation …
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Performance scaling of a novel Modular Hybrid Propulsion System for aircraft flight performance flexibility and enhancement
… in terms of hybridity (proportion of electric power output and energy storage) and modularity levels (proportion of total aircraft mass that is interchangeable). For takeoff, increasing the power hybridization value decreases takeoff distance when the electric motor (EM) specific power is …
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AC loss in MgB2-based fully superconducting electric machines
… have shown potential for dramatic increases in specific power for applications such as offshore wind generation, turbo-electric distributed propulsion in aircraft, and ship propulsion. Superconductors exhibit zero loss in dc conditions, though ac current produces considerable loss due to …
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1500W High Voltage DC-DC Converter for Electroaerodynamic Aircraft Applications
… payload for an extended period of time, improved power conversion technology is necessary. Prior work specifies a practical EAD aicraft as one with an endurance of 10 minutes, a payload capacity of 200 g, and full controllability. This work explores methods of increasing the specific power of …
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Testbed development and experimental validation of a high-power slotless stator
… the performance of components of a novel high-specific-power permanent magnet synchronous machine (PMSM) for electric aircraft propulsion. An important thrust in current aerospace research is aircraft electrification, including propulsion system electrification. For an electrified propulsion …
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Technological assessment and evaluation of high power batteries and their commercial values
… (HEV) energy storage market as it has higher specific energy and energy. However, in order to improve Li-ion battery technology to fulfill the' HEV energy storage requirements, a very high specific power characteristic is needed to boost its commercial attractiveness. The high specific power …
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High-frequency, slotless permanent magnet synchronous motor for aircraft propulsion
… development of next-generation, lightweight, power-dense motors. The benefit of lower weight in a motor is especially attractive when considered for aerospace applications, such as electric propulsion for aircraft. More specifically, significant reduction of weight and/or volume of the …
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Technoeconomic Assessment of a Gossamer, Planar, Gigawatt-Scale Space-Based Solar Power System
This thesis aims to analyze space-based solar power (SBSP) from both technical and financial standpoints. While the analysis is mainly purposed to validate the findings of existing literature on SBSP, it also seeks to identify the problems that need to be addressed for SBSP to become technically …
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Superconducting rotor with self-contained thermal management system
… (SC) electric machines can reach incredibly high specific power and are especially desirable for weight-sensitive applications including aircraft electric propulsion. However, thermal management of the cryogenic environment has posed challenges to building practical aerospace SC machines. …
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Technology survey and performance scaling for the design of high power nuclear electric power and propulsion systems
High power nuclear electric propulsion systems have the capability to enable many next-generation space exploration applications. To date, use of electric primary propulsion in flight systems has been limited to low-power, solar electric missions. There is a need for a large-scale research and …
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Development, manufacture, and qualification of stator components for a high-speed electric machine intended for aerospace applications
In recent years, advances in power electronics and materials have enabled innovative electric machine (EM) designs. At the same time, the environments and applications in which these electric machines are being used are becoming more and more demanding. For example, electric vehicles require …
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Toward high efficiency radioisotope thermophotovoltaic system by spectral control
… cell) are emitted to produce more electrical power while low energy photons ([lambda] > 2.25 [mu]m) in far infrared are suppressed to reduce waste heat. We validated a system simulation using the measurements of a prototype system powered by an electrical heater equivalent to one plutonium …
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Semiotic machines : software in discourse
… makes available to users, situating them within specific power-relations in the process.
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