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 15 of 15 for “"Distributed Electric Propulsion"”.
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Design, development and evaluation of a distributed electric propulsion testbed aircraft
… overall system technology readiness level of a distributed electric propulsion (DEP) based control system. The primary objectives of this work were to experimentally characterize the propulsion-airframe interactions inherent to DEP vehicles to aid in modeling and to explore and validate the use …
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System identification for development of distributed electric propulsion vertical take-off vehicles
This thesis presents a complete procedure for estimating the inertia matrix of a multi-rotor vertical take-off and landing vehicle. The procedure starts with an overview of vehicle dynamics. An estimator and a controller are introduced based on these dynamics, which can be tuned to the desired …
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Aero-propulsive characteristics of an overwing distributed electric propulsion system with vectored thrust
… conducted on a quasi-2D S8036 airfoil with a distributed electric propulsion (DEP) system. An overwing ducted fan system was tested with varied thrust angles achieved by deflecting the fan exit flow direction. The DEP system was comprised of five electric fans mounted on the upper surface of …
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Performance, Stability and Control of Electric Short Takeoff and Landing Aircraft
The maturation of distributed electric propulsion (DEP) technologies for aircraft presents an opportunity to develop new aircraft configurations which take advantage of favorable aero-propulsive couplings. One such arrangement is the electrically blown wing, where the slipstream of distributed, …
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Development and evaluation of a dynamically scaled testbed aircraft for a visual inertial odometry dataset
… (Cirrus SR22T) is to serve as a testbed for both Distributed Electric Propulsion (DEP) aircraft research and for Visual Inertial Odometry (VIO) research. The aircraft is used as a baseline to compare with the DEP aircraft, to draw conclusion regarding the effect of changing to a DEP configuration, …
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An assessment of electric STOL aircraft
Distributed electric propulsion (DEP) is an emerging set of technologies which enable new vehicle configurations by allowing the efficient distribution of many smaller propulsors around the airframe. One application of this technology is to greatly enhance the short takeoff and landing (STOL) …
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Design Optimization of a Regional Transport Aircraft with Hybrid Electric Distributed Propulsion Systems
… NASA's X-57, is one such concept using distributed electric propulsion (DEP) technology. Although practical implementation of DEP is achievable due to the scale invariance of highly efficient electric motors, the current battery technology restricts its adoption for commercial transport …
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Modeling of a Hybrid-Electric System and Design of Control Laws for Hybrid-Electric Urban Air Mobility Power Plants
… congestion. The current designs make use of Distributed Electric Propulsion (DEP): either fully electric or hybrid electric. The hybrid engine system consists of two power sources: prime movers, such as turbine engines, and batteries. The hybrid systems offer higher range and endurance …
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An Experimental Investigation of Blown-Flap Airfoils
At present, there is significant interest in electrically-powered Urban Air Mobility (UAM) aircraft that can operate in constrained take-off and landing areas (TOLAs) for a variety of missions. While many present designs use vertical take-off and landing (VTOL) capabilities to fulfill this …
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Hybrid Electric Distributed Propulsion for Vertical Takeoff and Landing Aircraft
… the interactions between aerodynamics and hybridelectric power system (HEPS) design and control for vertical takeoff and landing (VTOL) aircraft applications. Specifically, this research focuses on embedded distributed electric propulsion systems, for which the aerodynamic forces and moments are …
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The Influence of Propeller Position and Size on the Aerodynamics of Blown Wings
… is pushing aircraft designers towards more-electric propulsion architectures. One of the key benefits of electric propulsion is that multiple motors can be positioned around the airframe, without loss of motor efficiency. By placing many motors along the wing leading edge, each powering a …
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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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The effects of aero-propulsive coupling on aircraft with distributed propulsion systems
… 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 low-speed wind-tunnel …
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Advances in Aero-Propulsive Modeling for Fixed-Wing and eVTOL Aircraft Using Experimental Data
Small unmanned aircraft and electric vertical takeoff and landing (eVTOL) aircraft have recently emerged as vehicles able to perform new missions and stimulate future air transportation methods. This dissertation presents several system identification research advancements for these modern aircraft …
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Rotor Wakes; Formations, Interactions, and Design
… for sustainable energy solutions in aviation, distributed electric propulsion (DEP) has emerged as a promising configuration to enable advanced capabilities such as electric short take-off and landing (eSTOL). Using two primary research objectives, this dissertation investigates the fundamental …