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 10 of 10 for “"Hybrid-Electric Aircraft"”.
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Systems analysis of community noise impacts of advanced flight procedures for conventional and hybrid electric aircraft
Recent changes to aircraft approach and departure procedures enabled by more precise navigation technologies have created noise concentration problems for communities beneath flight tracks. There may be opportunities to reduce community noise impacts under these concentrated flight tracks through …
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Development of a high power density rotor
High specific power electric machines are crucial to enabling electric and hybrid-electric aircraft. In order to meet this need, a high specific power electric machine with an unconventional topology is being developed. The topology creates mechanical challenges including expansion due to high speed, …
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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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Experimental Investigation of Heat Transfer to Tightly Packed Cylinder Arrays
… the increased emphasis on the development of hybrid electric aircraft and other electric driven vehicles, the thermal demand on batteries is increasing. Unique to the aviation sector is the combined need of high battery thermal loads and a light-weight thermal management system. A proposed …
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Electromagnetic-thermal modeling for high-frequency air-core permanent magnet motor of aircraft application
… and efficiency over 96\%, is proposed for NASA hybrid-electric aircraft application. In order to maximize power density of the proposed motor topology, a large-scale multi-physics optimization is needed to obtain the best design candidates, which is not favorable for current electrical machine …
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Fundamental Configuration Optimisation of Aircraft with Electric Propulsion
Electric propulsion has the potential to induce a paradigm shift in how aircraft perform, provided the same shift occurs in their design. Improvements to conventional aircraft have reduced CO2 emissions per passenger kilometre by, on average, 3.8% per year since 1960, but these incremental …
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High-density multilevel power converters for use in renewable and transportation applications
… as inverters driving low-inductance high-density electric machines. Much of the prior work on the FCML converter has focused on various aspects of converter control. However, the demonstration of the power density and efficiency benefits of the topology have often been masked by the use of …
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An Assessment of the CFD Effectiveness for Simulating Wing Propeller Aerodynamics
Today, we see a renewed interest in aircraft with multiple propellers. To support conceptual design of these vehicles, one of the major needs is a fast and accurate method for estimating wing aerodynamic characteristics in the presence of multiple propellers. For the method to be effective, it must …
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Modeling hybrid-electric regional jet aircraft performance & emissions reduction potential
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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The effects of aero-propulsive coupling on aircraft with distributed propulsion systems
… coupling effects which are present for aircraft equipped with distributed electric propulsion (DEP) systems consisting of over-wing trailing-edge mounted (OWTE) arrays of ducted fans, and to identify the influence of those effects on aircraft dynamics. The first experiment consisted of …